🍒 420 - Intercept sigaction to prevent libraries from overwriting signal handlers#422
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jbachorik merged 2 commits intorelease/1.39._from Mar 19, 2026
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Wasmtime's SIGSEGV handler calls malloc() via __tls_get_addr, which is not async-signal-safe and causes deadlocks when profiler uses safefetch. Patch wasmtime's sigaction GOT entry to intercept handler installations. Their handlers are stored as chain targets and called from our handlers. Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com> (cherry picked from commit 2fcf604)
- Add NATIVE_LIBS_DROPPED counter and LOG_WARN macro - CodeCacheArray::add() returns bool, logs once on overflow - Fix memory leak: delete CodeCache on failed add - Add missing macOS stubs for sigaction protection Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> (cherry picked from commit e35fff9)
3 tasks
CI Test ResultsRun: #23286139431 | Commit:
Status Overview
Legend: ✅ passed | ❌ failed | ⚪ skipped | 🚫 cancelled Summary: Total: 32 | Passed: 32 | Failed: 0 Updated: 2026-03-19 08:38:08 UTC |
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Backport of #420 to
release/1.39._