Created attachment 464054 [details]
Reproducible poc

this poc can reproduce the crash stably
commit: bcd8cc0c0c83b0f2ddb78977a843650168bb138f

#0  0x00007ffff5ad400b in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1  0x00007ffff5ab3859 in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2  0x0000555555a3a1da in WTFCrashWithInfo(int, char const*, char const*, int) ()
#3  0x0000555556a83ca7 in JSC::Wasm::AirIRGenerator64::addSIMDRelOp(JSC::SIMDLaneOperation, JSC::SIMDInfo, JSC::Wasm::TypedTmp, JSC::Wasm::TypedTmp, JSC::B3::Air::Arg, JSC::Wasm::TypedTmp&) ()
#4  0x0000555556a63bf0 in std::experimental::fundamentals_v3::expected<void, WTF::String> JSC::Wasm::FunctionParser<JSC::Wasm::AirIRGenerator64>::simd<true, void>(JSC::SIMDLaneOperation, JSC::SIMDLane, JSC::SIMDSignMode, JSC::B3::Air::Arg) ()
#5  0x0000555556a43901 in JSC::Wasm::FunctionParser<JSC::Wasm::AirIRGenerator64>::parseExpression() ()
#6  0x0000555556a2d5db in JSC::Wasm::FunctionParser<JSC::Wasm::AirIRGenerator64>::parseBody() ()
#7  0x0000555556a2c65f in JSC::Wasm::FunctionParser<JSC::Wasm::AirIRGenerator64>::parse() ()
#8  0x0000555556a23eae in std::experimental::fundamentals_v3::expected<std::unique_ptr<JSC::Wasm::InternalFunction, std::default_delete<JSC::Wasm::InternalFunction> >, WTF::String> JSC::Wasm::parseAndCompileAirImpl<JSC::Wasm::AirIRGenerator64>(JSC::Wasm::CompilationContext&, JSC::Wasm::FunctionData const&, JSC::Wasm::TypeDefinition const&, WTF::Vector<JSC::Wasm::UnlinkedWasmToWasmCall, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&, JSC::Wasm::ModuleInformation const&, JSC::MemoryMode, unsigned int, std::optional<bool>, JSC::Wasm::TierUpCount*) ()
#9  0x0000555556a1c5d1 in JSC::Wasm::parseAndCompileAir(JSC::Wasm::CompilationContext&, JSC::Wasm::FunctionData const&, JSC::Wasm::TypeDefinition const&, WTF::Vector<JSC::Wasm::UnlinkedWasmToWasmCall, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&, JSC::Wasm::ModuleInformation const&, JSC::MemoryMode, unsigned int, std::optional<bool>, JSC::Wasm::TierUpCount*) ()
#10 0x00005555569c7e76 in JSC::Wasm::BBQPlan::compileFunction(unsigned int, JSC::Wasm::CompilationContext&, WTF::Vector<JSC::Wasm::UnlinkedWasmToWasmCall, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&, JSC::Wasm::TierUpCount*) ()
#11 0x00005555569c6a56 in JSC::Wasm::BBQPlan::work(JSC::Wasm::Plan::CompilationEffort) ()
#12 0x0000555556b49ab2 in JSC::Wasm::Worklist::Thread::work() ()
#13 0x0000555556bf4143 in WTF::Detail::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0, void>::call() ()
#14 0x0000555556c1537f in WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) ()
#15 0x0000555556c6f096 in WTF::wtfThreadEntryPoint(void*) ()
#16 0x00007ffff5fe3609 in start_thread () from /lib/x86_64-linux-gnu/libpthread.so.0
#17 0x00007ffff5bb0133 in clone () from /lib/x86_64-linux-gnu/libc.so.6