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ci: pin Test job to ubuntu-24.04 (bun test breaks on ubuntu-latest kernel 6.17)#200

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ci: pin Test job to ubuntu-24.04 (bun test breaks on ubuntu-latest kernel 6.17)#200
KB (KB-syntheticsciences) wants to merge 2 commits into
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chore/bump-bun-1.3.14

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@KB-syntheticsciences KB (KB-syntheticsciences) commented Jul 22, 2026 •
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Problem

CI's Test job (bun test) has failed on every run since ~2026-07-11 — a runner-environment issue, not a code or test failure. ubuntu-latest moved to an image with kernel 6.17.0, on which Bun's test runner misbehaves:

  • Bun 1.3.5 (pinned): panic: Segmentation fault / SIGILL (Illegal instruction) before any assertion runs.
  • Bun 1.3.14 (latest): no crash, but mis-resolves an ESM named export (discoverOAuthProtectedResourceMetadata) from @modelcontextprotocol/sdk — a resolution error that does not reproduce on a clean local install.

Evidence it's environmental and repo-wide:

  • Only the bun test job is affected — bun run typecheck, bun install, and bun run build all pass on 1.3.5 on the same image.
  • An unrelated dependabot PR (Actions bump, zero source changes) crashes with the identical signature.
  • Both toolchains pass locally on an older kernel; re-running with a fresh cache reproduces identically (not a cache issue).

Fix

Pin the Test job to ubuntu-24.04, keeping the tested Bun 1.3.5 toolchain unchanged. This runs bun test on a kernel where it works, instead of chasing a Bun version that behaves on kernel 6.17 (1.3.14 is already the latest stable, and it's broken there too).

Net change vs main: a single runs-on line (+ explanatory comment). No toolchain change.

An earlier commit on this branch bumped Bun to 1.3.14; that is reverted here in favour of pinning the runner, since the root cause is the runner image, not the Bun version.

@KB-syntheticsciences
chore: bump Bun 1.3.5 → 1.3.14 to fix CI SIGILL segfault
37550cc 
CI's Test job (bun test) has crashed on every run since ~2026-07-11 with a
Bun panic, not a test failure:

  Bun v1.3.5 (1e86cebd) · Linux Kernel v6.17.0 · glibc v2.39
  panic(main thread): Segmentation fault at address 0x18
  oh no: Bun has crashed. This indicates a bug in Bun, not your code.
  error: script "test" terminated by signal SIGILL (Illegal instruction)

The GitHub runner image now ships kernel 6.17.0, on which the pinned Bun
1.3.5 build hits an illegal-instruction crash before any test assertion
runs. It is environment-wide, not code-specific: an unrelated dependabot
PR (github_actions bump, zero source changes) crashes with the identical
signature.

Bump the pinned toolchain (packageManager + @types/bun catalog) to the
latest stable 1.3.14. Validated locally on 1.3.14: full backend suite
1162 pass / 0 fail, forced (no-cache) typecheck 7/7.
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@KB-syntheticsciences
ci: pin Test job to ubuntu-24.04 instead of bumping Bun
254241e 
Revert the Bun 1.3.5 -> 1.3.14 bump from the previous commit and fix the
root cause instead: ubuntu-latest moved to a kernel-6.17 image on which
'bun test' misbehaves (1.3.5 SIGILLs, 1.3.14 mis-resolves an ESM export
from @modelcontextprotocol/sdk). Every other CI job passes on 1.3.5 on
the same image; only the test runner on kernel 6.17 is affected, and an
unrelated dependabot PR crashed identically.

Pin the Test job to ubuntu-24.04, keeping the tested Bun 1.3.5 toolchain
unchanged. Net change vs main is the single runs-on line.
@KB-syntheticsciences KB (KB-syntheticsciences) changed the title chore: bump Bun 1.3.5 → 1.3.14 to fix CI SIGILL segfault ci: pin Test job to ubuntu-24.04 (bun test breaks on ubuntu-latest kernel 6.17) Jul 22, 2026
@KB-syntheticsciences

KB (KB-syntheticsciences) commented Jul 22, 2026

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Closing — this is not fixable from the repo.

Diagnosis: the CI Test job failure is an external GitHub runner-image regression, not a code, toolchain, or version issue. The Test job passed green for weeks (through Jul 11) on the same base commit and same Bun 1.3.5. The only thing that changed:

Runner image Kernel Test
Jul 11 (green) ubuntu24/20260705.232 6.17.0-1018-azure ✅
Jul 22 (red) ubuntu24/20260714.240 6.17.0-1020-azure ❌

GitHub bumped the ubuntu-24.04 image (~Jul 14), whose azure-kernel patch (-1018 → -1020) breaks Bun's test runner — a SIGILL on the JIT (Bun 1.3.5), and non-deterministic ESM-resolution failures from @modelcontextprotocol/sdk once past the crash (Bun 1.3.14). An unrelated dependabot PR fails identically, so it's repo-wide.

Neither a Bun bump (1.3.14 fails differently) nor a runner pin helps — GitHub serves only the latest patch of each image label, so the good .232 image can't be pinned. Expected to self-resolve when GitHub ships a fixed image or Bun ships a kernel-compat fix.

No repo change is warranted; parking this.

This was referenced Jul 22, 2026
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