V8 crash (Illegal instruction) on WSL2 Ubuntu 24.04 with Intel i9-14900HX

Description

Claude Code v2.0.64 crashes with a V8 "unreachable code" fatal error and "Illegal instruction (core dumped)" when running on WSL2.

Environment

• Claude Code version: 2.0.64
• OS: Ubuntu 24.04.3 LTS on WSL2
• Kernel: 6.6.87.2-microsoft-standard-WSL2
• CPU: Intel Core i9-14900HX
• Node.js: v20.19.6
• npm: 10.8.2
• Installation method: sudo npm install -g @anthropic-ai/claude-code

Steps to Reproduce

1. Install Claude Code on WSL2 Ubuntu 24.04
2. Run claude from terminal
3. Ask Claude a question that triggers tool use (e.g., "why are you not seeing the custom commands")
4. Claude begins processing, uses Bash/Read tools
5. Crash occurs

Stack Trace

# Fatal error in , line 0
# unreachable code
#
#FailureMessage Object: 0x7136daffb1e0
----- Native stack trace -----

 1: 0xd30b21  [claude]
 2: 0x2141db1 V8_Fatal(char const*, ...) [claude]
 3: 0x22180a7  [claude]
 4: 0x24b082f v8::internal::compiler::MemoryLowering::ReduceStoreField(v8::internal::compiler::Node*, v8::internal::compiler::MemoryLowering::AllocationState const*) [claude]
 5: 0x24b47fe v8::internal::compiler::MemoryOptimizer::Optimize() [claude]
 6: 0x222cbde  [claude]
 7: 0x222f6cd auto v8::internal::compiler::PipelineImpl::Run<v8::internal::compiler::MemoryOptimizationPhase>() [claude]
 8: 0x2244820 v8::internal::compiler::PipelineImpl::OptimizeGraph(v8::internal::compiler::Linkage*) [claude]
 9: 0x2244dc0 v8::internal::compiler::PipelineCompilationJob::ExecuteJobImpl(v8::internal::RuntimeCallStats*, v8::internal::LocalIsolate*) [claude]
10: 0xfa4afb v8::internal::OptimizedCompilationJob::ExecuteJob(v8::internal::RuntimeCallStats*, v8::internal::LocalIsolate*) [claude]
11: 0xfd2921 v8::internal::OptimizingCompileDispatcher::CompileNext(v8::internal::TurbofanCompilationJob*, v8::internal::LocalIsolate*) [claude]
12: 0xfd2c9d v8::internal::OptimizingCompileDispatcher::CompileTask::RunInternal() [claude]
13: 0xd30cc1  [claude]
14: 0x7136dc89caa4  [/lib/x86_64-linux-gnu/libc.so.6]
15: 0x7136dc929c6c  [/lib/x86_64-linux-gnu/libc.so.6]
Illegal instruction (core dumped)

Notes

• The crash appears to be in V8's Turbofan compiler during memory optimization
• The "Illegal instruction" suggests possible CPU instruction incompatibility
• Claude Code works fine on Windows with the same machine
• The crash is intermittent but reproducible within a few prompts

Workaround

Using Claude Code on Windows and accessing WSL files via \wsl$\Ubuntu\... path