vmcore: report the release of the crashed kernel - #2652
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kdump runs in a very small environment and cut-down set of drivers, and it can die before the dump lands: it runs out of memory, a device hangs on reset, or a watchdog fires while the dump is still being written out. This happens about a single high digit percentage on most of big scale datacenters. When that happens the only evidence left is what the capture kernel printed to the console, and that does not say which kernel crashed. A fleet typically pins one kdump image and boots it after crashes from many different production kernels, and it is useful to understand what are the combination of crashed kernel panic and succesful kdump collection. Whether the dump completes at all tends to depend on the kernel that died: memory pinned, devices in flight, dump size. The release is already recorded. crash_save_vmcoreinfo_init() puts OSRELEASE= in the VMCOREINFO note, and by the time vmcore_init() has run parse_crash_elf_headers() that note sits in elfnotes_buf. Walk the notes for it and print: vmcore: dump is from kernel 7.3.0-rc3-next-20260917 Given this is cheap and useful, I think it is worth adding to vmcore, to improve kdump monitoring. Signed-off-by: Breno Leitao <leitao@debian.org>
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Series: https://patchwork.kernel.org/project/linux-fsdevel/list/?series=1170276
Submitter: Breno Leitao
Version: 1
Patches: 1/1
Message-ID:
<20260921-kdump_print-v1-1-e445fec3177c@debian.org>Base: vfs.base.ci
Lore: https://lore.kernel.org/linux-fsdevel/20260921-kdump_print-v1-1-e445fec3177c@debian.org
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