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SIGILL (Illegal Instruction) on Intel Xeon E3-1270 V2 (no AVX-512/AVX2 support) #8727

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opened 2026-02-16 18:10:40 -05:00 by yindo · 1 comment
yindo commented 2026-02-16 18:10:40 -05:00
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Originally created by @jojojojojoj5564656465465 on GitHub (Feb 6, 2026).

Originally assigned to: @rekram1-node on GitHub.

Description

Description:
When running the pre-built binary of OpenCode (version 1.1.53-1 from AUR), the application crashes immediately with a SIGILL (Illegal Instruction) error. This occurs on an Intel Xeon E3-1270 V2 CPU, which does not support AVX-512 or AVX2 instructions.

Steps to Reproduce:

  1. Install opencode-bin from AUR (or download the pre-built binary).
  2. Run opencode in a terminal.
  3. The application crashes with: 
    zsh: illegal hardware instruction (core dumped)  opencode

Debugging Output:

Using strace, the crash occurs at address 0x3cb1130 with:

--- SIGILL {si_signo=SIGILL, si_code=ILL_ILLOPN, si_addr=0x3cb1130} ---
+++ killed by SIGILL (core dumped) +++

Full strace output: [link to a gist or pastebin with the full log](https://gist.github.com/...).

System Information:

  • CPU: Intel Xeon E3-1270 V2 (Ivy Bridge, no AVX-512/AVX2 support).
    Output of lscpu: 
    Model name: Intel(R) Xeon(R) CPU E3-1270 V2 @ 3.50GHz
Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm cpuid_fault epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts vnmi md_clear flush_l1d
  • OS: Arch Linux (EndeavourOS), Kernel 6.18.2-1-cachyos-bore.
  • Binary: /usr/bin/opencode (146 MiB, x86_64).

Analysis:

  • The binary appears to include instructions not supported by older Intel CPUs (e.g., AVX-512 or AVX2).
  • objdump -d /usr/bin/opencode | grep -E "avx512|avx2" returns no output, but strace confirms a SIGILL.
  • All dependencies (libc, libicui18n.so.78, etc.) are correctly loaded.

Suggested Fixes:

  1. Provide a binary compiled with -march=haswell or -march=ivybridge for compatibility with older CPUs.
  2. Add a runtime CPU check to gracefully fail with a clear error message if unsupported instructions are required.
  3. Document CPU requirements in the README (e.g., "AVX2 or newer required").

Workarounds Tried:

  • Reinstalling opencode-bin (no change).
  • Testing with a fresh user (no change).
  • Updating all system libraries (no change).

Additional Notes:

  • The issue does not occur on newer CPUs (e.g., Intel Skylake or AMD Zen 2+).
  • Compiling from source with -march=native may resolve the issue, but a pre-built compatible binary would be ideal for users with older hardware.

Labels to Add (if possible):

  • bug
  • crash
  • cpu-compatibility

Why This Matters:

Many users (especially on Linux) still rely on older but capable hardware (e.g., Xeon E3 v2/v3, i5/i7 3rd/4th gen). Providing a compatible binary or clear documentation would improve accessibility.

Let me know if you need further details or logs!

How to Submit:

  1. Go to [OpenCode GitHub Issues](https://github.com/anomalyco/opencode/issues).
  2. Click "New Issue", paste the above, and submit.

Note: If you want to attach the full strace log, upload it to [Gist](https://gist.github.com/) or [Pastebin](https://pastebin.com/) and link it in the issue.

Plugins

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OpenCode version

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Steps to reproduce

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Screenshot and/or share link

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Operating System

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Originally created by @jojojojojoj5564656465465 on GitHub (Feb 6, 2026). Originally assigned to: @rekram1-node on GitHub. ### Description **Description:** When running the pre-built binary of OpenCode (version 1.1.53-1 from AUR), the application crashes immediately with a `SIGILL` (Illegal Instruction) error. This occurs on an **Intel Xeon E3-1270 V2** CPU, which does **not** support AVX-512 or AVX2 instructions. ### Steps to Reproduce: 1. Install `opencode-bin` from AUR (or download the pre-built binary). 2. Run `opencode` in a terminal. 3. The application crashes with: ``` zsh: illegal hardware instruction (core dumped) opencode ``` ### Debugging Output: Using `strace`, the crash occurs at address `0x3cb1130` with: ``` --- SIGILL {si_signo=SIGILL, si_code=ILL_ILLOPN, si_addr=0x3cb1130} --- +++ killed by SIGILL (core dumped) +++ ``` Full `strace` output: [[link to a gist or pastebin with the full log](https://gist.github.com/...)](https://gist.github.com/...). ### System Information: - **CPU:** Intel Xeon E3-1270 V2 (Ivy Bridge, no AVX-512/AVX2 support). Output of `lscpu`: ``` Model name: Intel(R) Xeon(R) CPU E3-1270 V2 @ 3.50GHz Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc cpuid aperfmperf pni pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm cpuid_fault epb pti ssbd ibrs ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts vnmi md_clear flush_l1d ``` - **OS:** Arch Linux (EndeavourOS), Kernel 6.18.2-1-cachyos-bore. - **Binary:** `/usr/bin/opencode` (146 MiB, x86_64). ### Analysis: - The binary appears to include instructions not supported by older Intel CPUs (e.g., AVX-512 or AVX2). - `objdump -d /usr/bin/opencode | grep -E "avx512|avx2"` returns no output, but `strace` confirms a `SIGILL`. - All dependencies (`libc`, `libicui18n.so.78`, etc.) are correctly loaded. ### Suggested Fixes: 1. **Provide a binary compiled with `-march=haswell` or `-march=ivybridge`** for compatibility with older CPUs. 2. **Add a runtime CPU check** to gracefully fail with a clear error message if unsupported instructions are required. 3. **Document CPU requirements** in the README (e.g., "AVX2 or newer required"). ### Workarounds Tried: - Reinstalling `opencode-bin` (no change). - Testing with a fresh user (no change). - Updating all system libraries (no change). ### Additional Notes: - The issue does not occur on newer CPUs (e.g., Intel Skylake or AMD Zen 2+). - Compiling from source with `-march=native` may resolve the issue, but a pre-built compatible binary would be ideal for users with older hardware. --- **Labels to Add (if possible):** - `bug` - `crash` - `cpu-compatibility` --- ### Why This Matters: Many users (especially on Linux) still rely on older but capable hardware (e.g., Xeon E3 v2/v3, i5/i7 3rd/4th gen). Providing a compatible binary or clear documentation would improve accessibility. Let me know if you need further details or logs! --- ### How to Submit: 1. Go to [[OpenCode GitHub Issues](https://github.com/anomalyco/opencode/issues)](https://github.com/anomalyco/opencode/issues). 2. Click **"New Issue"**, paste the above, and submit. --- **Note:** If you want to attach the full `strace` log, upload it to [[Gist](https://gist.github.com/)](https://gist.github.com/) or [[Pastebin](https://pastebin.com/)](https://pastebin.com/) and link it in the issue. ### Plugins _No response_ ### OpenCode version _No response_ ### Steps to reproduce _No response_ ### Screenshot and/or share link _No response_ ### Operating System _No response_ ### Terminal _No response_
yindo added the bugperf labels 2026-02-16 18:10:40 -05:00
yindo commented 2026-02-16 18:10:41 -05:00
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@github-actions[bot] commented on GitHub (Feb 6, 2026):

This issue might be a duplicate of existing issues. Please check:

  • #12474: opencode crashes on aarch64+64k systems (64KB page size) - Similar hardware compatibility issue where the binary crashes due to CPU/system-level incompatibilities

Feel free to ignore if none of these address your specific case.

@github-actions[bot] commented on GitHub (Feb 6, 2026): This issue might be a duplicate of existing issues. Please check: - #12474: opencode crashes on aarch64+64k systems (64KB page size) - Similar hardware compatibility issue where the binary crashes due to CPU/system-level incompatibilities Feel free to ignore if none of these address your specific case.
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Reference: anomalyco/opencode#8727
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