Illegal instruction (core dumped) — SIGILL in wasm_trampoline_wasm_ipint_call_wide32 on Linux x86_64_baseline (v1.3.10)

[MrTelecom]

Bug Report

Bun version: 1.3.10 (commit 1423d3c)
OS: Linux x86_64_baseline
Error: Illegal instruction (core dumped) — Segmentation fault at address 0x7FFF11BAC215

Crash Report

Full crash report: https://bun.report/1.3.10/B_11423d3cmgEuhogC4oi5wE+ypRslpuiEslpuiEslpuiEslpuiEslpuiEslpuiEslpuiEslpuiE__________A22//B3is8wiC

Stack Trace

The crash occurs in repeated calls to wasm_trampoline_wasm_ipint_call_wide32 in ld-temp.o, indicating a WebAssembly trampoline recursion issue that eventually triggers a SIGILL (illegal instruction).

Steps to Reproduce

1. Running Bun v1.3.10 on Linux x86_64_baseline
2. Executing a workload that involves WebAssembly execution
3. Bun crashes with Illegal instruction (core dumped)

Expected Behavior

Bun should execute the WebAssembly workload without crashing.

Actual Behavior

Bun crashes with a SIGILL signal. The stack trace shows deep recursion in wasm_trampoline_wasm_ipint_call_wide32, suggesting the WASM interpreter trampoline hits an illegal CPU instruction on the baseline x86_64 build.

Additional Context

• The crash occurs on the x86_64_baseline build, which may be relevant — this build targets older CPUs without AVX/AVX2 support, and the illegal instruction could indicate a codegen issue where non-baseline instructions are emitted.
• The crash report has been automatically sent to the Bun team for internal tracking.

[github-actions]

Found 3 possible duplicate issues:

1. Segmentation fault in WASM trampoline (v1.3.10, Linux x86_64) #27340
2. Bun 1.3.6: Baseline build crashes with SIGILL #26136
3. bug: illegal hardware instruction (core dumped) #25070

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🤖 Generated with Claude Code

[Jarred-Sumner]

Fixed in #26922. This will be part of the next Claude Code release.