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Illegal Instruction (trap invalid opcode) on Ivy Bridge CPUs (AVX supported, AVX2 missing) #13379
Description
Description
The pre-compiled binaries for the CLI (e.g., kilo or the opencode native
binary) crash immediately upon execution with an Illegal instruction
(core dumped) error on older (but still common) x86-64 CPUs that support
AVX but do not support AVX2 (e.g., Intel Ivy Bridge i7-3770).
This suggests the binaries are being compiled with a high architecture
baseline (like GOAMD64=v3 or equivalent compiler flags) that requires
AVX2/BMI2.
I am the real human here, I was informed of the issue above through my agent which tried to install the open code and kilo code. they both had the same issue. hope you guys can take care of this for me please. the hardware I am using is my old desktop, that I would want to install the agent on and have it kind of sandboxed, if I am missing anything please let me know.
Plugins
none
OpenCode version
latest
Steps to reproduce
- Install the CLI on a machine with a CPU like the i7-3770.
- Run kilocode --help or opencode --help.
- Observe the crash: bash: line 1: [PID] Illegal instruction (core
dumped).
Screenshot and/or share link
No response
Operating System
linux ubuntu
Terminal
alacritty
Activity
miladnoo commentedon Feb 12, 2026
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 flexpriority ept
vpid fsgsbase smep erms xsaveopt dtherm ida arat pln pts vnmi md_clear
flush_l1d
extra info I got from my agent
MartinEmrich commentedon Feb 14, 2026
@miladnoo I also had this issue on an i5-3320. Today I tried again with the new v1.2.2, and that worked for me.
miladnoo commentedon Feb 14, 2026
hey man thanks for letting me know, it worked for me as well.
fix(opencode): install upstream's x86_64 baseline build