Bug 283277 – WebAssembly assertion failed in parseExpression

• Component: WebAssembly
• Status: RESOLVED DUPLICATE

Created attachment 473254 [details]
standalone runnable poc

WebKit commit id: 1a9adbce1d3fbd78795e86aad2c57ce384e31168 (Nov 16 2024)


# POC (short version):
```
load("test/mjsunit/wasm/wasm-module-builder.js");
const builder = new WasmModuleBuilder();
builder.addType(kSig_i_iii);
builder.addType(makeSig([], [kWasmF64,kWasmF64]));
for (let i = 0; i < 100; i++) {
    builder.addType(makeSig([], []));
}
const sig = builder.addType(kSig_i_iii);
const v121 = builder.nextTypeIndex();
builder.addType(makeSig([], []));
builder.addType(makeSig([], []));
const v133 = builder.nextTypeIndex();
const v134 = [v133,v133,v133,v133];
builder.addType(makeSig(v134, []));
const func = builder.addFunction("func", v121);
const function_body = [kExprRefNull,kFuncRefCode,kGCPrefix,kExprRefCastNull,v133];
func.addBody(function_body);
builder.instantiate();
```

The attachment is a longer and standalone POC that contains the `wasm-module-builder.js` source code (the poc code is at the end of the attached poc_withbuilder.js).


# Reproduction:

build: `./Tools/Scripts/build-jsc --jsc-only --debug --cmakeargs="-DENABLE_STATIC_JSC=ON -DCMAKE_CXX_FLAGS='  -O3 -lrt'"`

run: `./WebKitBuild/JSCOnly/Debug/bin/jsc  ./poc_withbuilder.js`


# Output:

```
SHOULD NEVER BE REACHED
./WebKit/Source/JavaScriptCore/wasm/WasmFunctionParser.h(2714) : JSC::Wasm::ParserBase::PartialResult JSC::Wasm::FunctionParser<JSC::Wasm::LLIntGenerator>::parseExpression() [Context = JSC::Wasm::LLIntGenerator]
1   0x55ce66db604d ../../WebKit/WebKitBuild/JSCOnly/Debug/bin/jsc(+0x252704d) [0x55ce66db604d]
2   0x55ce66d8e66b ../../WebKit/WebKitBuild/JSCOnly/Debug/bin/jsc(+0x24ff66b) [0x55ce66d8e66b]
3   0x55ce66d1266c ../../WebKit/WebKitBuild/JSCOnly/Debug/bin/jsc(+0x248366c) [0x55ce66d1266c]
4   0x55ce66d1159f ../../WebKit/WebKitBuild/JSCOnly/Debug/bin/jsc(+0x248259f) [0x55ce66d1159f]
5   0x55ce66d2f920 ../../WebKit/WebKitBuild/JSCOnly/Debug/bin/jsc(+0x24a0920) [0x55ce66d2f920]
6   0x55ce66c922dd ../../WebKit/WebKitBuild/JSCOnly/Debug/bin/jsc(+0x24032dd) [0x55ce66c922dd]
7   0x55ce66f7e771 ../../WebKit/WebKitBuild/JSCOnly/Debug/bin/jsc(+0x26ef771) [0x55ce66f7e771]
8   0x55ce670c9964 ../../WebKit/WebKitBuild/JSCOnly/Debug/bin/jsc(+0x283a964) [0x55ce670c9964]
9   0x55ce670e94da ../../WebKit/WebKitBuild/JSCOnly/Debug/bin/jsc(+0x285a4da) [0x55ce670e94da]
10  0x55ce67174d36 ../../WebKit/WebKitBuild/JSCOnly/Debug/bin/jsc(+0x28e5d36) [0x55ce67174d36]
11  0x7f12936aeac3 /lib/x86_64-linux-gnu/libc.so.6(+0x94ac3) [0x7f12936aeac3]
12  0x7f1293740850 /lib/x86_64-linux-gnu/libc.so.6(+0x126850) [0x7f1293740850]
Aborted (core dumped)
```


# GDB backtrace:

```
#2  __GI___pthread_kill (threadid=140735935108672, signo=signo@entry=6) at ./nptl/pthread_kill.c:89
#3  0x00007ffff5803476 in __GI_raise (sig=sig@entry=6) at ../sysdeps/posix/raise.c:26
#4  0x00007ffff57e97f3 in __GI_abort () at ./stdlib/abort.c:79
#5  0x000055555639304a in WTFCrashWithInfo () at WTF/Headers/wtf/Assertions.h:913
#6  0x0000555557a7b062 in JSC::Wasm::FunctionParser<JSC::Wasm::LLIntGenerator>::parseExpression (this=this@entry=0x7fffa36b1180) at ./WebKit/Source/JavaScriptCore/wasm/WasmFunctionParser.h:2714
#7  0x0000555557a5366b in JSC::Wasm::FunctionParser<JSC::Wasm::LLIntGenerator>::parseBody (this=this@entry=0x7fffa36b1180) at ./WebKit/Source/JavaScriptCore/wasm/WasmFunctionParser.h:534
#8  0x00005555579d766c in JSC::Wasm::FunctionParser<JSC::Wasm::LLIntGenerator>::parse (this=this@entry=0x7fffa36b1180) at ./WebKit/Source/JavaScriptCore/wasm/WasmFunctionParser.h:487
#9  0x00005555579d659f in JSC::Wasm::parseAndCompileBytecode (function=..., signature=..., info=..., functionIndex=functionIndex@entry=...) at ./WebKit/Source/JavaScriptCore/wasm/WasmLLIntGenerator.cpp:634
#10 0x00005555579f4920 in JSC::Wasm::LLIntPlan::compileFunction (this=0x7fffeb04b5a0, functionIndex=...) at ./WebKit/Source/JavaScriptCore/wasm/WasmLLIntPlan.cpp:105
#11 0x00005555579572dd in JSC::Wasm::EntryPlan::compileFunctions (this=0x7fffeb04b5a0, effort=JSC::Wasm::Plan::Partial) at ./WebKit/Source/JavaScriptCore/wasm/WasmEntryPlan.cpp:218
#12 0x0000555557c43771 in JSC::Wasm::Worklist::Thread::work (this=0x7fffeb175670) at ./WebKit/Source/JavaScriptCore/wasm/WasmWorklist.cpp:108
#13 0x0000555557d8e964 in WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0::operator()() const (this=<optimized out>) at ./WebKit/Source/WTF/wtf/AutomaticThread.cpp:225
#14 WTF::Detail::CallableWrapper<WTF::AutomaticThread::start(WTF::AbstractLocker const&)::$_0, void>::call() (this=<optimized out>) at ./WebKit/Source/WTF/wtf/Function.h:53
#15 0x0000555557dae4da in WTF::Function<void ()>::operator()() const (this=<optimized out>) at ./WebKit/Source/WTF/wtf/Function.h:82
#16 WTF::Thread::entryPoint (newThreadContext=<optimized out>) at ./WebKit/Source/WTF/wtf/Threading.cpp:265
```

[Radar WebKit Bug Importer]

<rdar://problem/140524325>

[Yusuke Suzuki]

Thanks. This is dupe of bug 283262

[Yusuke Suzuki]

*** This bug has been marked as a duplicate of bug 283262 ***