Automatically mount internal disk partitions

[enigma131]

Describe your feature request

Hi,
I've try to mount internal disk ext4 partition, it's not working.
Is it possible to process this kind of use case ?
BR

Additional context

No response

[kthchew]

I think it is a current FSKit limitation that automount on an internal partition isn't working. macOS currently treats an FSKit extension as per-user rather than system-wide, but an internal partition appears before login, so at the time it would try to determine what type of filesystem it is and mount, ExtendFS can't activate.

I've submitted a report to Apple (FB21729650), but I'm not sure there's much I can do about this until Apple fixes this. However, it seems like using the mount command in Terminal would work as a workaround until then. Try this and see if it works:

Important

These steps require macOS 26.1 or later. sudo mount does not work on versions of macOS earlier than that due to a macOS bug, including all versions of macOS Sequoia as of writing.

1. Open Terminal
2. Run diskutil list
3. Check the "IDENTIFIER" for your partition (for example, disk1s3). There's a decent chance the correct one will either have a type of Microsoft Basic Data or Linux and have a blank name.
4. Run these two commands in Terminal, replacing diskXsY with the actual identifier you saw in step 3:

mkdir -p /tmp/mnt
sudo mount -t ExtendFS /dev/diskXsY /tmp/mnt

[enigma131]

Yes I've used diskutil to have the partition string. But wait I've test with external disk I have same error. Tested on Tahoe 26.2, it says partition error and partitions haven't errors.

[kthchew]

test with external disk I have same error

Might be a different issue.

it says partition error and partitions haven't errors.

It's not clear what you're seeing. Can you send a screenshot of the error you see?

Also, does this problem continue if you use a Linux machine to check and repair that external disk?

[enigma131]

Same problem with MacOS 26.2 or mounting a ext4 file on an external multi partition disk.

Edit :

On MacOS, /tmp is a symlink to /private/tmp , so I create /private/tmp/tmp first.

Then :
mount -t ExtendFS /dev/disk0s5 /private/tmp/mnt
mount: Probing resource: The operation couldn’t be completed. Permission denied
mount: exec /Library/Filesystems/ExtendFS.fs/Contents/Resources/mount_ExtendFS for /private/tmp/mnt: No such file or directory
mount: /private/tmp/mnt failed with 72

try with sudo :
sudo mount -t ExtendFS /dev/disk0s5 /private/tmp/mnt
Password:
mount: exec /Library/Filesystems/ExtendFS.fs/Contents/Resources/mount_ExtendFS for /private/tmp/mnt: No such file or directory
mount: /private/tmp/mnt failed with 72

[kthchew]

For this to work /tmp/mnt (aka /private/tmp/mnt) has to exist:

mkdir -p /tmp/mnt

(also it doesn't really have to be /tmp/mnt, any empty directory should work, for example you could make a folder in your home directory and use that instead)

---

mounting a ext4 file on an external multi partition disk

In the external disk case it is expected that the disk mounts automatically when you plug it in, unless it uses a feature that isn't supported. For example, if LVM or encryption is enabled on that disk, then ExtendFS doesn't support and and it won't work.

[enigma131]

Yes i had create /private/tmp/mnt before command as written above. Result is error 72
With external disk, no encryption, only Ntfs partition are auto mounted, Linux partitions are ignored from MacOs
Did you try on Tahoe ?

[kthchew]

Did you try on Tahoe ?

Yes, it does work in my tests on 26.2.

Actually, looking at the output in your edit:

sudo mount -t ExtendFS /dev/disk0s5 /private/tmp/mnt
Password:
mount: exec /Library/Filesystems/ExtendFS.fs/Contents/Resources/mount_ExtendFS for /private/tmp/mnt: No such file or directory
mount: /private/tmp/mnt failed with 72

I don't actually see any ExtendFS-related error at all. (Previously I was mostly looking at your /tmp/mnt: invalid file system error, which confusingly means that /tmp/mnt doesn't exist. However the newer error does get past that problem but doesn't actually show any error returned from ExtendFS, which makes me think it's not running at all for some reason.) If it's due to unsupported features you'd instead see something like

mount: Loading resource: The resource was recognized but is not usable by the system.

Can you let me know:

1. Where have you installed ExtendFS.app? In /Applications, or somewhere else?
2. What do you see when you run this command: pluginkit -vmA | grep com.kpchew
3. When you open ExtendFS.app, on macOS Tahoe you are expected to see a green checkmark if everything is enabled and working correctly:

Do you see this?

[enigma131]

Yes I've put it in /applications then follow your readme.md. Now if I click on Icon, I get this, same as you but n french :

[kthchew]

OK, that shouldn't be the problem then.

I think I'll need logs to see what is happening here. Can you do the following:

1. Try mounting your disk again (e.g. run your mount command again)
2. Immediately after trying to mount, run this command:

sudo log show --last 5m --predicate "subsystem in { 'com.apple.FSKit', 'com.apple.LiveFS', 'com.kpchew.ExtendFS.ext4Extension' }"

3. Copy and paste the output of the log command here.

[enigma131]

Logs

sudo log show --last 5m --predicate "subsystem in { 'com.apple.FSKit', 'com.apple.LiveFS', 'com.kpchew.ExtendFS.ext4Extension' }"
Password:
Filtering the log data using "subsystem IN {"com.apple.FSKit", "com.apple.LiveFS", "com.kpchew.ExtendFS.ext4Extension"}"
Skipping info and debug messages, pass --info and/or --debug to include.
Timestamp                       Thread     Type        Activity             PID    TTL  
2026-01-25 18:45:59.859396+0100 0x2ee      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] main:lifs:v2:1
2026-01-25 18:46:00.019681+0100 0x2ee      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] Done setting up mach ports
2026-01-25 18:46:00.019682+0100 0x2ee      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] Done setting up mach ports
2026-01-25 18:46:02.046157+0100 0x2ee      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] checkIfUnlocked:Device was unlocked, proceed with main flow.
2026-01-25 18:46:03.435847+0100 0x2ee      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Loading modules from LS
2026-01-25 18:46:03.453454+0100 0x2ee      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning extension types <private>
2026-01-25 18:46:03.454631+0100 0x2ee      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Adding LS record <private>
2026-01-25 18:46:03.454654+0100 0x2ee      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] returning ep records <private>
2026-01-25 18:46:03.569191+0100 0x2ee      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] New module list <private>
2026-01-25 18:46:03.569195+0100 0x2ee      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Old modules (null)
2026-01-25 18:46:03.569300+0100 0x2ee      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Added 3 identifiers: <private>
2026-01-25 18:46:03.577405+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Incomming connection, entitled 1
2026-01-25 18:46:03.580186+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Hello FSClient! entitlement yes
2026-01-25 18:46:03.580625+0100 0x2e5      Default     0x0                  126    0    diskarbitrationd: (FSKit) [com.apple.FSKit:default] Setting remote protocol to all XPC
2026-01-25 18:46:03.582923+0100 0x3a4      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-25 18:46:03.582933+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:03.583007+0100 0x3a4      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:03.583027+0100 0x3a4      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-25 18:46:03.592705+0100 0x3a4      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-25 18:46:03.592710+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:03.592762+0100 0x3a4      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:03.592782+0100 0x3a4      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-25 18:46:03.605780+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:03.605804+0100 0x411      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:04.657338+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to grab assertion on pid 222
2026-01-25 18:46:04.714037+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-25 18:46:06.167345+0100 0x45b      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Have delegate, class <private>
2026-01-25 18:46:06.167376+0100 0x45b      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] file system extension backpointer loaded
2026-01-25 18:46:06.289002+0100 0x45b      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleExtension didFinishLaunching]: Created FSMachPort = 10771
2026-01-25 18:46:06.291612+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleExtension(Project) shouldAcceptConnection:] returning YES
2026-01-25 18:46:06.292085+0100 0x4c3      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-25 18:46:06.292090+0100 0x4c3      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-25 18:46:06.294411+0100 0x4c3      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful dynamic cast of resource to bd. Got fd 3
2026-01-25 18:46:06.294611+0100 0x4c3      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] readFirstSectorAndLog reading from 3 got rv 512 error (null)
2026-01-25 18:46:06.294613+0100 0x4c3      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful read, first characters eb58:904d
2026-01-25 18:46:06.298121+0100 0x4c3      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Returning <private>
2026-01-25 18:46:06.302716+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:06.302725+0100 0x411      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:06.305829+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-25 18:46:06.306271+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-25 18:46:06.306280+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-25 18:46:06.307232+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful dynamic cast of resource to bd. Got fd 3
2026-01-25 18:46:06.307431+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] readFirstSectorAndLog reading from 3 got rv 512 error (null)
2026-01-25 18:46:06.307433+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful read, first characters eb58:904d
2026-01-25 18:46:06.308078+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Returning <private>
2026-01-25 18:46:06.330960+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:06.330970+0100 0x43a      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:06.413296+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to grab assertion on pid 236
2026-01-25 18:46:06.418082+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-25 18:46:06.650601+0100 0x4e1      Default     0x0                  236    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Have delegate, class <private>
2026-01-25 18:46:06.650630+0100 0x4e1      Default     0x0                  236    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] file system extension backpointer loaded
2026-01-25 18:46:06.651006+0100 0x4e1      Default     0x0                  236    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleExtension didFinishLaunching]: Created FSMachPort = 10767
2026-01-25 18:46:06.653367+0100 0x4e7      Default     0x0                  236    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleExtension(Project) shouldAcceptConnection:] returning YES
2026-01-25 18:46:06.653782+0100 0x4e7      Default     0x0                  236    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-25 18:46:06.653787+0100 0x4e7      Default     0x0                  236    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-25 18:46:06.655825+0100 0x4e6      Default     0x0                  236    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleConnector loadResource:options:replyHandler:]:start
2026-01-25 18:46:06.658494+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] -[fskitdExtensionClient configureUserClient:replyHandler:]: pid 236 pidversion 503 enableBlockResource 1
2026-01-25 18:46:06.658769+0100 0x4e7      Default     0x0                  236    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleConnector loadResource:options:replyHandler:]_block_invoke_2: configureUserClient for FSModule com.apple.fskit.msdos returned error ((null))
2026-01-25 18:46:06.662736+0100 0x4e7      Default     0x0                  236    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Built listener <private>
2026-01-25 18:46:06.676241+0100 0x4e7      Default     0x0                  236    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleConnector checkWithOptions:connection:taskID:replyHandler:]:start
2026-01-25 18:46:06.685542+0100 0x4e7      Default     0x0                  236    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Testing: just set hasCancellation to 0, we see 0
2026-01-25 18:46:06.686052+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Adding taskID <private> to resource <private>
2026-01-25 18:46:06.699013+0100 0x43a      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-25 18:46:06.699020+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:06.699028+0100 0x43a      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:06.699040+0100 0x43a      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-25 18:46:06.708343+0100 0x3a4      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-25 18:46:06.708349+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:06.708359+0100 0x3a4      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:06.708371+0100 0x3a4      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-25 18:46:06.716265+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:06.716274+0100 0x3a4      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:06.719129+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-25 18:46:06.719576+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-25 18:46:06.719582+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-25 18:46:06.720506+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful dynamic cast of resource to bd. Got fd 3
2026-01-25 18:46:06.720817+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] readFirstSectorAndLog reading from 3 got rv 512 error (null)
2026-01-25 18:46:06.720820+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful read, first characters eb52:904e
2026-01-25 18:46:06.721107+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Returning <private>
2026-01-25 18:46:06.728796+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:06.728805+0100 0x411      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:06.812254+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to grab assertion on pid 239
2026-01-25 18:46:06.817370+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-25 18:46:07.111575+0100 0x4ff      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Have delegate, class <private>
2026-01-25 18:46:07.111611+0100 0x4ff      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] file system extension backpointer loaded
2026-01-25 18:46:07.112035+0100 0x4ff      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] -[FSModuleExtension didFinishLaunching]: Created FSMachPort = 10767
2026-01-25 18:46:07.114384+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] -[FSModuleExtension(Project) shouldAcceptConnection:] returning YES
2026-01-25 18:46:07.114769+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-25 18:46:07.114774+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-25 18:46:07.115893+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Successful dynamic cast of resource to bd. Got fd 3
2026-01-25 18:46:07.116248+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] readFirstSectorAndLog reading from 3 got rv 512 error (null)
2026-01-25 18:46:07.116250+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Successful read, first characters eb52:904e
2026-01-25 18:46:07.116381+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: [com.apple.FSKit:default] -[exfatFileSystem probeResource:replyHandler:]: device matches!
2026-01-25 18:46:07.116956+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Returning <private>
2026-01-25 18:46:07.174779+0100 0x43a      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-25 18:46:07.174785+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:07.174796+0100 0x43a      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:07.174809+0100 0x43a      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-25 18:46:07.338459+0100 0x43a      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-25 18:46:07.338465+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:07.338476+0100 0x43a      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:07.338489+0100 0x43a      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-25 18:46:07.347427+0100 0x411      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-25 18:46:07.347432+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:07.347442+0100 0x411      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:07.347454+0100 0x411      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-25 18:46:07.354992+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:07.355001+0100 0x43a      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:07.358260+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-25 18:46:07.358646+0100 0x4c3      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-25 18:46:07.358652+0100 0x4c3      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-25 18:46:07.359523+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful dynamic cast of resource to bd. Got fd 3
2026-01-25 18:46:07.359818+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] readFirstSectorAndLog reading from 3 got rv 512 error (null)
2026-01-25 18:46:07.359820+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful read, first characters eb52:904e
2026-01-25 18:46:07.360061+0100 0x4c4      Default     0x0                  222    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Returning <private>
2026-01-25 18:46:07.476222+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:07.476231+0100 0x43a      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:07.478674+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-25 18:46:07.479105+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-25 18:46:07.479114+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-25 18:46:07.480019+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Successful dynamic cast of resource to bd. Got fd 3
2026-01-25 18:46:07.480282+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] readFirstSectorAndLog reading from 3 got rv 512 error (null)
2026-01-25 18:46:07.480284+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Successful read, first characters eb52:904e
2026-01-25 18:46:07.480298+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: [com.apple.FSKit:default] -[exfatFileSystem probeResource:replyHandler:]: device matches!
2026-01-25 18:46:07.480728+0100 0x508      Default     0x0                  239    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Returning <private>
2026-01-25 18:46:07.563213+0100 0x411      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-25 18:46:07.563219+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:07.563229+0100 0x411      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:07.563241+0100 0x411      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-25 18:46:07.940825+0100 0x549      Default     0x0                  248    0    UVFSService: (LiveFS) [com.apple.LiveFS:default] Getting listener for volume: <private>
2026-01-25 18:46:07.944569+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Incomming connection, entitled 1
2026-01-25 18:46:07.945063+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] ReallyMountVolume: Enter for provider com.apple.filesystems.UserFS.FileProvider mounting: <private>
2026-01-25 18:46:07.962491+0100 0x545      Default     0x0                  247    0    userfsd: (LiveFS) [com.apple.LiveFS:default] Getting listener for volume: <private>
2026-01-25 18:46:07.962802+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] Got connection
2026-01-25 18:46:07.968488+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] creating mount task to <private> with type <private>
2026-01-25 18:46:07.968829+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] -[mountEntry mount:options:]: will mount over LIFSv2
2026-01-25 18:46:07.979160+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] <private>: FMT CAPS: 0x00002fca
2026-01-25 18:46:07.979164+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] <private>: INT CAPS: 0x00104b80
2026-01-25 18:46:08.656497+0100 0x576      Default     0x0                  254    0    UVFSService: (LiveFS) [com.apple.LiveFS:default] Getting listener for volume: <private>
2026-01-25 18:46:08.659177+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Incomming connection, entitled 1
2026-01-25 18:46:08.659538+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] ReallyMountVolume: Enter for provider com.apple.filesystems.UserFS.FileProvider mounting: <private>
2026-01-25 18:46:08.682262+0100 0x545      Default     0x0                  247    0    userfsd: (LiveFS) [com.apple.LiveFS:default] Getting listener for volume: <private>
2026-01-25 18:46:08.682519+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] Got connection
2026-01-25 18:46:08.684770+0100 0x43a      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] creating mount task to <private> with type <private>
2026-01-25 18:46:08.684990+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] -[mountEntry mount:options:]: will mount over LIFSv2
2026-01-25 18:46:08.694794+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] <private>: FMT CAPS: 0x00002fca
2026-01-25 18:46:08.694798+0100 0x411      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] <private>: INT CAPS: 0x00104b80
2026-01-25 18:46:22.544275+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Incomming connection, entitled 0
2026-01-25 18:46:22.544979+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Hello FSClient! entitlement no
2026-01-25 18:46:22.545186+0100 0x729      Default     0x0                  235    0    storagekitd: (FSKit) [com.apple.FSKit:default] Setting remote protocol to all XPC
2026-01-25 18:46:22.708442+0100 0x3a4      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-25 18:46:22.708448+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-25 18:46:22.708459+0100 0x3a4      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-25 18:46:22.708472+0100 0x3a4      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-25 18:46:22.708473+0100 0x3a4      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] About to filter
2026-01-25 18:46:22.708491+0100 0x3a4      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Received error '(null)', errno 2, retrieving team ID
2026-01-25 18:48:40.304224+0100 0x177f     Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Incomming connection, entitled 0
2026-01-25 18:48:40.304630+0100 0x177f     Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Hello FSClient! entitlement no
2026-01-25 18:48:40.305068+0100 0x196a     Default     0x0                  680    0    mount: (FSKit) [com.apple.FSKit:default] Setting remote protocol to all XPC
2026-01-25 18:48:40.306523+0100 0x177f     Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to get current agent for 501
2026-01-25 18:48:40.448324+0100 0x196e     Default     0x0                  681    0    fskit_agent: (FSKit) [com.apple.FSKit:default] Loading modules from LS
2026-01-25 18:48:40.453558+0100 0x196e     Default     0x0                  681    0    fskit_agent: (FSKit) [com.apple.FSKit:default] Returning extension types <private>
2026-01-25 18:48:40.453757+0100 0x196e     Default     0x0                  681    0    fskit_agent: (FSKit) [com.apple.FSKit:default] Adding LS record <private>
2026-01-25 18:48:40.453777+0100 0x196e     Default     0x0                  681    0    fskit_agent: (FSKit) [com.apple.FSKit:default] returning ep records <private>
2026-01-25 18:48:40.473888+0100 0x196e     Default     0x0                  681    0    fskit_agent: (FSKit) [com.apple.FSKit:default] New module list <private>
2026-01-25 18:48:40.473890+0100 0x196e     Default     0x0                  681    0    fskit_agent: (FSKit) [com.apple.FSKit:default] Old modules (null)
2026-01-25 18:48:40.473949+0100 0x196e     Default     0x0                  681    0    fskit_agent: [com.apple.FSKit:default] Added 4 identifiers: <private>
2026-01-25 18:48:40.485466+0100 0x196c     Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to get current agent for 501
2026-01-25 18:48:40.491359+0100 0x196c     Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to get current agent for 501
2026-01-25 18:48:40.856420+0100 0x196c     Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to grab assertion on pid 683
2026-01-25 18:48:40.859072+0100 0x4f4      Error       0x0                  225    0    fskit_helper: [com.apple.FSKit:default] FSKitHelper: /dev/rdisk0s5: error=13
2026-01-25 18:48:40.859397+0100 0x196c     Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] +[FSBlockDeviceResource(Project) openWithBSDName:writable:auditToken:replyHandler:]_block_invoke: Open device returned error Error Domain=NSPOSIXErrorDomain Code=13
2026-01-25 18:48:40.859582+0100 0x196c     Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] -[fskitdXPCServer getRealResource:auditToken:reply:]: Unable to convert proxy FSBlockDeviceResource into open resource
2026-01-25 18:48:40.859601+0100 0x196c     Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] -[fskitdXPCServer applyResource:usingIdentity:instanceID:initiatorAuditToken:authorizingAuditToken:usingBlock:]: Can't get the real resource of <private>
2026-01-25 18:48:40.954848+0100 0x197e     Default     0x0                  683    0    ExtendFS Extension (ext4): (FSKit) [com.apple.FSKit:default] Have delegate, class <private>
2026-01-25 18:48:40.954872+0100 0x197e     Default     0x0                  683    0    ExtendFS Extension (ext4): (FSKit) [com.apple.FSKit:default] file system extension backpointer loaded
2026-01-25 18:48:40.955152+0100 0x197e     Default     0x0                  683    0    ExtendFS Extension (ext4): (FSKit) [com.apple.FSKit:default] -[FSModuleExtension didFinishLaunching]: Created FSMachPort = 11027
2026-01-25 18:48:40.956549+0100 0x197e     Default     0x0                  683    0    ExtendFS Extension (ext4): (FSKit) [com.apple.FSKit:default] Have delegate, class <private>
2026-01-25 18:48:40.956582+0100 0x197e     Default     0x0                  683    0    ExtendFS Extension (ext4): (FSKit) [com.apple.FSKit:default] file system extension backpointer loaded
2026-01-25 18:48:40.956590+0100 0x197e     Default     0x0                  683    0    ExtendFS Extension (ext4): (FSKit) [com.apple.FSKit:default] -[FSModuleExtension didFinishLaunching]: Created FSMachPort = 11027
2026-01-25 18:48:40.957969+0100 0x197e     Default     0x0                  683    0    ExtendFS Extension (ext4): (FSKit) [com.apple.FSKit:default] Have delegate, class <private>
2026-01-25 18:48:40.957986+0100 0x197e     Default     0x0                  683    0    ExtendFS Extension (ext4): (FSKit) [com.apple.FSKit:default] file system extension backpointer loaded
2026-01-25 18:48:40.957992+0100 0x197e     Default     0x0                  683    0    ExtendFS Extension (ext4): (FSKit) [com.apple.FSKit:default] -[FSModuleExtension didFinishLaunching]: Created FSMachPort = 11027
--------------------------------------------------------------------------------------------------------------------
Log      - Default:        161, Info:                0, Debug:             0, Error:         22, Fault:          0
Activity - Create:           0, Transition:          0, Actions:           0

[kthchew]

I see this (POSIX error 13) which means "permission denied"

2026-01-25 18:48:40.859397+0100 0x196c     Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] +[FSBlockDeviceResource(Project) openWithBSDName:writable:auditToken:replyHandler:]_block_invoke: Open device returned error Error Domain=NSPOSIXErrorDomain Code=13
2026-01-25 18:48:40.859582+0100 0x196c     Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] -[fskitdXPCServer getRealResource:auditToken:reply:]: Unable to convert proxy FSBlockDeviceResource into open resource

Sorry about being unclear - can you mount with sudo on macOS 26.2 and get the logs again? (It's very important that you use macOS 26.2 when using sudo mount because there was a bug in versions before 26.1 where sudo was not working properly for mounting with FSKit extensions. I saw macOS 26.0.1 on a previous screenshot you sent and remembered that could be relevant.)

[enigma131]

Logs

Last login: Mon Jan 26 09:20:37 on console
enigma7@MacBook-Pro-de-enigma7 ~ % mkdir /private/tmp/mnt                                                                                                           
enigma7@MacBook-Pro-de-enigma7 ~ % diskutil list                                                                                                                    
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *240.1 GB   disk0
   1:                        EFI SYSEFI                  88.1 MB    disk0s1
   2: 142F5F5D-B9E5-4433-87C0-68B6B72699C7               33.6 MB    disk0s2
   3:       Microsoft Basic Data W10                     64.4 GB    disk0s3
   4:                 Apple_APFS Container disk1         40.3 GB    disk0s4
   5:           Linux Filesystem                         80.0 GB    disk0s5
   6:       Microsoft Basic Data Datas                   55.2 GB    disk0s6

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +40.3 GB    disk1
                                 Physical Store disk0s4
   1:                APFS Volume MACOS26 - Données       6.3 GB     disk1s1
   2:                APFS Volume Preboot                 2.6 GB     disk1s3
   3:                APFS Volume Recovery                1.4 GB     disk1s4
   4:                APFS Volume MACOS26                 12.0 GB    disk1s5
   5:              APFS Snapshot com.apple.os.update-... 12.0 GB    disk1s5s1
   6:                APFS Volume VM                      1.1 MB     disk1s6

enigma7@MacBook-Pro-de-enigma7 ~ % sudo mount -t ExtendFS /dev/disk0s5 /private/tmp/mnt                                                                             
Password:
mount: exec /Library/Filesystems/ExtendFS.fs/Contents/Resources/mount_ExtendFS for /private/tmp/mnt: No such file or directory
mount: /private/tmp/mnt failed with 72
enigma7@MacBook-Pro-de-enigma7 ~ % sudo log show --last 5m --predicate "subsystem in { 'com.apple.FSKit', 'com.apple.LiveFS', 'com.kpchew.ExtendFS.ext4Extension' }"
Filtering the log data using "subsystem IN {"com.apple.FSKit", "com.apple.LiveFS", "com.kpchew.ExtendFS.ext4Extension"}"
Skipping info and debug messages, pass --info and/or --debug to include.
Timestamp                       Thread     Type        Activity             PID    TTL  
2026-01-26 09:20:14.855599+0100 0x2e7      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] main:lifs:v2:1
2026-01-26 09:20:15.024024+0100 0x2e7      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] Done setting up mach ports
2026-01-26 09:20:15.024026+0100 0x2e7      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] Done setting up mach ports
2026-01-26 09:20:16.765422+0100 0x2e7      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] checkIfUnlocked:Device was unlocked, proceed with main flow.
2026-01-26 09:20:18.366610+0100 0x2e7      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Loading modules from LS
2026-01-26 09:20:18.397489+0100 0x2e7      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning extension types <private>
2026-01-26 09:20:18.398319+0100 0x2e7      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Adding LS record <private>
2026-01-26 09:20:18.398338+0100 0x2e7      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] returning ep records <private>
2026-01-26 09:20:18.506692+0100 0x2e7      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] New module list <private>
2026-01-26 09:20:18.506697+0100 0x2e7      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Old modules (null)
2026-01-26 09:20:18.506803+0100 0x2e7      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Added 3 identifiers: <private>
2026-01-26 09:20:18.552100+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Incomming connection, entitled 1
2026-01-26 09:20:18.554820+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Hello FSClient! entitlement yes
2026-01-26 09:20:18.555122+0100 0x2e4      Default     0x0                  126    0    diskarbitrationd: (FSKit) [com.apple.FSKit:default] Setting remote protocol to all XPC
2026-01-26 09:20:18.557554+0100 0x396      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-26 09:20:18.557566+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:18.557707+0100 0x396      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:18.557731+0100 0x396      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-26 09:20:18.565949+0100 0x396      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-26 09:20:18.565954+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:18.566007+0100 0x396      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:18.566026+0100 0x396      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-26 09:20:18.578410+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:18.578431+0100 0x413      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:19.879876+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to grab assertion on pid 227
2026-01-26 09:20:19.942205+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-26 09:20:21.325793+0100 0x475      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Have delegate, class <private>
2026-01-26 09:20:21.325823+0100 0x475      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] file system extension backpointer loaded
2026-01-26 09:20:21.330578+0100 0x475      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleExtension didFinishLaunching]: Created FSMachPort = 10767
2026-01-26 09:20:21.333669+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleExtension(Project) shouldAcceptConnection:] returning YES
2026-01-26 09:20:21.334163+0100 0x4cb      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-26 09:20:21.334169+0100 0x4cb      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-26 09:20:21.336574+0100 0x4cb      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful dynamic cast of resource to bd. Got fd 3
2026-01-26 09:20:21.336847+0100 0x4cb      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] readFirstSectorAndLog reading from 3 got rv 512 error (null)
2026-01-26 09:20:21.336849+0100 0x4cb      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful read, first characters eb58:904d
2026-01-26 09:20:21.340130+0100 0x4cb      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Returning <private>
2026-01-26 09:20:21.346556+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:21.346565+0100 0x396      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:21.349515+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-26 09:20:21.349958+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-26 09:20:21.349967+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-26 09:20:21.351072+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful dynamic cast of resource to bd. Got fd 3
2026-01-26 09:20:21.351235+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] readFirstSectorAndLog reading from 3 got rv 512 error (null)
2026-01-26 09:20:21.351237+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful read, first characters eb58:904d
2026-01-26 09:20:21.351844+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Returning <private>
2026-01-26 09:20:21.375364+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:21.375375+0100 0x396      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:21.459623+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to grab assertion on pid 235
2026-01-26 09:20:21.465906+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-26 09:20:21.795442+0100 0x4e6      Default     0x0                  235    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Have delegate, class <private>
2026-01-26 09:20:21.796143+0100 0x4e6      Default     0x0                  235    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] file system extension backpointer loaded
2026-01-26 09:20:21.798788+0100 0x4e6      Default     0x0                  235    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleExtension didFinishLaunching]: Created FSMachPort = 10767
2026-01-26 09:20:21.801437+0100 0x4e8      Default     0x0                  235    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleExtension(Project) shouldAcceptConnection:] returning YES
2026-01-26 09:20:21.801945+0100 0x4e9      Default     0x0                  235    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-26 09:20:21.801950+0100 0x4e9      Default     0x0                  235    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-26 09:20:21.804085+0100 0x4e8      Default     0x0                  235    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleConnector loadResource:options:replyHandler:]:start
2026-01-26 09:20:21.808491+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] -[fskitdExtensionClient configureUserClient:replyHandler:]: pid 235 pidversion 500 enableBlockResource 1
2026-01-26 09:20:21.808709+0100 0x4e9      Default     0x0                  235    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleConnector loadResource:options:replyHandler:]_block_invoke_2: configureUserClient for FSModule com.apple.fskit.msdos returned error ((null))
2026-01-26 09:20:21.816187+0100 0x4e9      Default     0x0                  235    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Built listener <private>
2026-01-26 09:20:21.831362+0100 0x4e9      Default     0x0                  235    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] -[FSModuleConnector checkWithOptions:connection:taskID:replyHandler:]:start
2026-01-26 09:20:21.840728+0100 0x4e8      Default     0x0                  235    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Testing: just set hasCancellation to 0, we see 0
2026-01-26 09:20:21.841455+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Adding taskID <private> to resource <private>
2026-01-26 09:20:21.854323+0100 0x396      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-26 09:20:21.854329+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:21.854338+0100 0x396      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:21.854350+0100 0x396      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-26 09:20:21.863430+0100 0x413      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-26 09:20:21.863435+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:21.863445+0100 0x413      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:21.863457+0100 0x413      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-26 09:20:21.871514+0100 0x45d      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:21.871524+0100 0x45d      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:21.874971+0100 0x45d      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-26 09:20:21.875402+0100 0x4cb      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-26 09:20:21.875407+0100 0x4cb      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-26 09:20:21.876301+0100 0x4cb      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful dynamic cast of resource to bd. Got fd 3
2026-01-26 09:20:21.876684+0100 0x4cb      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] readFirstSectorAndLog reading from 3 got rv 512 error (null)
2026-01-26 09:20:21.876686+0100 0x4cb      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful read, first characters eb52:904e
2026-01-26 09:20:21.876955+0100 0x4cb      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Returning <private>
2026-01-26 09:20:21.883832+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:21.883841+0100 0x413      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:22.022158+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to grab assertion on pid 238
2026-01-26 09:20:22.026655+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-26 09:20:22.485029+0100 0x502      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Have delegate, class <private>
2026-01-26 09:20:22.485060+0100 0x502      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] file system extension backpointer loaded
2026-01-26 09:20:22.485800+0100 0x502      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] -[FSModuleExtension didFinishLaunching]: Created FSMachPort = 10763
2026-01-26 09:20:22.488405+0100 0x514      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] -[FSModuleExtension(Project) shouldAcceptConnection:] returning YES
2026-01-26 09:20:22.488815+0100 0x513      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-26 09:20:22.488820+0100 0x513      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-26 09:20:22.490139+0100 0x513      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Successful dynamic cast of resource to bd. Got fd 3
2026-01-26 09:20:22.490499+0100 0x513      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] readFirstSectorAndLog reading from 3 got rv 512 error (null)
2026-01-26 09:20:22.490500+0100 0x513      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Successful read, first characters eb52:904e
2026-01-26 09:20:22.490637+0100 0x513      Default     0x0                  238    0    com.apple.fskit.exfat: [com.apple.FSKit:default] -[exfatFileSystem probeResource:replyHandler:]: device matches!
2026-01-26 09:20:22.491332+0100 0x513      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Returning <private>
2026-01-26 09:20:22.551267+0100 0x413      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-26 09:20:22.551273+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:22.551283+0100 0x413      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:22.551295+0100 0x413      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-26 09:20:22.566975+0100 0x527      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-26 09:20:22.566980+0100 0x527      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:22.566989+0100 0x527      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:22.567001+0100 0x527      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-26 09:20:22.575977+0100 0x527      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-26 09:20:22.575983+0100 0x527      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:22.575992+0100 0x527      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:22.576009+0100 0x527      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-26 09:20:22.582947+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:22.582956+0100 0x413      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:22.585599+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-26 09:20:22.586045+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-26 09:20:22.586051+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-26 09:20:22.587080+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful dynamic cast of resource to bd. Got fd 3
2026-01-26 09:20:22.587371+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] readFirstSectorAndLog reading from 3 got rv 512 error (null)
2026-01-26 09:20:22.587373+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Successful read, first characters eb52:904e
2026-01-26 09:20:22.587570+0100 0x4ce      Default     0x0                  227    0    com.apple.fskit.msdos: (FSKit) [com.apple.FSKit:default] Returning <private>
2026-01-26 09:20:22.595228+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:22.595237+0100 0x413      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:22.597573+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] About to talk to the connection for <private>
2026-01-26 09:20:22.598065+0100 0x514      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn:extensionID:<private>
2026-01-26 09:20:22.598075+0100 0x514      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] FSModuleExtension.checkIn returning (null)
2026-01-26 09:20:22.599078+0100 0x513      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Successful dynamic cast of resource to bd. Got fd 3
2026-01-26 09:20:22.599270+0100 0x513      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] readFirstSectorAndLog reading from 3 got rv 512 error (null)
2026-01-26 09:20:22.599272+0100 0x513      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Successful read, first characters eb52:904e
2026-01-26 09:20:22.599286+0100 0x513      Default     0x0                  238    0    com.apple.fskit.exfat: [com.apple.FSKit:default] -[exfatFileSystem probeResource:replyHandler:]: device matches!
2026-01-26 09:20:22.599698+0100 0x513      Default     0x0                  238    0    com.apple.fskit.exfat: (FSKit) [com.apple.FSKit:default] Returning <private>
2026-01-26 09:20:22.650409+0100 0x413      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-26 09:20:22.650415+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:22.650425+0100 0x413      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:22.650439+0100 0x413      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-26 09:20:23.032528+0100 0x54d      Default     0x0                  247    0    UVFSService: (LiveFS) [com.apple.LiveFS:default] Getting listener for volume: <private>
2026-01-26 09:20:23.036644+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Incomming connection, entitled 1
2026-01-26 09:20:23.037138+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] ReallyMountVolume: Enter for provider com.apple.filesystems.UserFS.FileProvider mounting: <private>
2026-01-26 09:20:23.046578+0100 0x541      Default     0x0                  246    0    userfsd: (LiveFS) [com.apple.LiveFS:default] Getting listener for volume: <private>
2026-01-26 09:20:23.046873+0100 0x527      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] Got connection
2026-01-26 09:20:23.052509+0100 0x527      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] creating mount task to <private> with type <private>
2026-01-26 09:20:23.052858+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] -[mountEntry mount:options:]: will mount over LIFSv2
2026-01-26 09:20:23.063437+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] <private>: FMT CAPS: 0x00002fca
2026-01-26 09:20:23.063440+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] <private>: INT CAPS: 0x00104b80
2026-01-26 09:20:23.429093+0100 0x574      Default     0x0                  250    0    UVFSService: (LiveFS) [com.apple.LiveFS:default] Getting listener for volume: <private>
2026-01-26 09:20:23.431763+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Incomming connection, entitled 1
2026-01-26 09:20:23.432147+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] ReallyMountVolume: Enter for provider com.apple.filesystems.UserFS.FileProvider mounting: <private>
2026-01-26 09:20:23.436850+0100 0x577      Default     0x0                  246    0    userfsd: (LiveFS) [com.apple.LiveFS:default] Getting listener for volume: <private>
2026-01-26 09:20:23.437113+0100 0x45d      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] Got connection
2026-01-26 09:20:23.439209+0100 0x45d      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] creating mount task to <private> with type <private>
2026-01-26 09:20:23.439389+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] -[mountEntry mount:options:]: will mount over LIFSv2
2026-01-26 09:20:23.447882+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] <private>: FMT CAPS: 0x00002fca
2026-01-26 09:20:23.447886+0100 0x413      Default     0x0                  171    0    fskitd: [com.apple.LiveFS:default] <private>: INT CAPS: 0x00104b80
2026-01-26 09:20:36.262220+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Incomming connection, entitled 0
2026-01-26 09:20:36.262822+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Hello FSClient! entitlement no
2026-01-26 09:20:36.263054+0100 0x756      Default     0x0                  234    0    storagekitd: (FSKit) [com.apple.FSKit:default] Setting remote protocol to all XPC
2026-01-26 09:20:36.265621+0100 0x396      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting extensions
2026-01-26 09:20:36.265626+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:20:36.265635+0100 0x396      Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
2026-01-26 09:20:36.265647+0100 0x396      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] Got extensions <private>
2026-01-26 09:20:36.265648+0100 0x396      Error       0x0                  171    0    fskitd: [com.apple.FSKit:default] About to filter
2026-01-26 09:20:36.265665+0100 0x396      Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Received error '(null)', errno 2, retrieving team ID
2026-01-26 09:23:47.437027+0100 0x163c     Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Incomming connection, entitled 0
2026-01-26 09:23:47.437305+0100 0x163c     Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Hello FSClient! entitlement no
2026-01-26 09:23:47.437657+0100 0x1b5f     Default     0x0                  691    0    mount: (FSKit) [com.apple.FSKit:default] Setting remote protocol to all XPC
2026-01-26 09:23:47.438521+0100 0x163c     Default     0x0                  171    0    fskitd: [com.apple.FSKit:default] Getting own modules
2026-01-26 09:23:47.438529+0100 0x163c     Default     0x0                  171    0    fskitd: (FSKit) [com.apple.FSKit:default] Returning module array <private>
--------------------------------------------------------------------------------------------------------------------
Log      - Default:        142, Info:                0, Debug:             0, Error:         19, Fault:          0
Activity - Create:           0, Transition:          0, Actions:           0