Fatal error in , line 0 # unreachable code

[mykola-mokhnach]

Version

20.19.0

Platform

unbuntu-latest GH Actions runner

Subsystem

No response

What steps will reproduce the bug?

The error is observed randomly with different Node.js versions while running unit tests as part of the https://github.com/appium/appium CI integration. Tests are executed by mocha

How often does it reproduce? Is there a required condition?

It looks like the error is random. Exact steps to repro it are not known.

What is the expected behavior? Why is that the expected behavior?

No crash

What do you see instead?

#
# Fatal error in , line 0
# unreachable code
#
#
#
#FailureMessage Object: 0x7ffe51c05140
----- Native stack trace -----

 1: 0xd43461  [node]
 2: 0x218e601 V8_Fatal(char const*, ...) [node]
 3: 0x157b16c int v8::internal::Deserializer<v8::internal::Isolate>::ReadSingleBytecodeData<v8::internal::SlotAccessorForHeapObject>(unsigned char, v8::internal::SlotAccessorForHeapObject) [node]
 4: 0x157c311 v8::internal::Deserializer<v8::internal::Isolate>::ReadData(v8::internal::Handle<v8::internal::HeapObject>, int, int) [node]
 5: 0x157c5d8 v8::internal::Deserializer<v8::internal::Isolate>::ReadObject(v8::internal::SnapshotSpace) [node]
 6: 0x157b1db int v8::internal::Deserializer<v8::internal::Isolate>::ReadSingleBytecodeData<v8::internal::SlotAccessorForHeapObject>(unsigned char, v8::internal::SlotAccessorForHeapObject) [node]
 7: 0x157c311 v8::internal::Deserializer<v8::internal::Isolate>::ReadData(v8::internal::Handle<v8::internal::HeapObject>, int, int) [node]
 8: 0x157c5d8 v8::internal::Deserializer<v8::internal::Isolate>::ReadObject(v8::internal::SnapshotSpace) [node]
 9: 0x157b1db int v8::internal::Deserializer<v8::internal::Isolate>::ReadSingleBytecodeData<v8::internal::SlotAccessorForHeapObject>(unsigned char, v8::internal::SlotAccessorForHeapObject) [node]
10: 0x157c311 v8::internal::Deserializer<v8::internal::Isolate>::ReadData(v8::internal::Handle<v8::internal::HeapObject>, int, int) [node]
11: 0x157c5d8 v8::internal::Deserializer<v8::internal::Isolate>::ReadObject(v8::internal::SnapshotSpace) [node]
12: 0x157b1db int v8::internal::Deserializer<v8::internal::Isolate>::ReadSingleBytecodeData<v8::internal::SlotAccessorForHeapObject>(unsigned char, v8::internal::SlotAccessorForHeapObject) [node]
13: 0x157c311 v8::internal::Deserializer<v8::internal::Isolate>::ReadData(v8::internal::Handle<v8::internal::HeapObject>, int, int) [node]
14: 0x157c5d8 v8::internal::Deserializer<v8::internal::Isolate>::ReadObject(v8::internal::SnapshotSpace) [node]
15: 0x157b1db int v8::internal::Deserializer<v8::internal::Isolate>::ReadSingleBytecodeData<v8::internal::SlotAccessorForHeapObject>(unsigned char, v8::internal::SlotAccessorForHeapObject) [node]
16: 0x157c311 v8::internal::Deserializer<v8::internal::Isolate>::ReadData(v8::internal::Handle<v8::internal::HeapObject>, int, int) [node]
17: 0x157c5d8 v8::internal::Deserializer<v8::internal::Isolate>::ReadObject(v8::internal::SnapshotSpace) [node]
18: 0x157b1db int v8::internal::Deserializer<v8::internal::Isolate>::ReadSingleBytecodeData<v8::internal::SlotAccessorForHeapObject>(unsigned char, v8::internal::SlotAccessorForHeapObject) [node]
19: 0x157c311 v8::internal::Deserializer<v8::internal::Isolate>::ReadData(v8::internal::Handle<v8::internal::HeapObject>, int, int) [node]
20: 0x157c5d8 v8::internal::Deserializer<v8::internal::Isolate>::ReadObject(v8::internal::SnapshotSpace) [node]
21: 0x157b1db int v8::internal::Deserializer<v8::internal::Isolate>::ReadSingleBytecodeData<v8::internal::SlotAccessorForHeapObject>(unsigned char, v8::internal::SlotAccessorForHeapObject) [node]
22: 0x157c311 v8::internal::Deserializer<v8::internal::Isolate>::ReadData(v8::internal::Handle<v8::internal::HeapObject>, int, int) [node]
23: 0x157c5d8 v8::internal::Deserializer<v8::internal::Isolate>::ReadObject(v8::internal::SnapshotSpace) [node]
24: 0x157b1db int v8::internal::Deserializer<v8::internal::Isolate>::ReadSingleBytecodeData<v8::internal::SlotAccessorForHeapObject>(unsigned char, v8::internal::SlotAccessorForHeapObject) [node]
25: 0x157c311 v8::internal::Deserializer<v8::internal::Isolate>::ReadData(v8::internal::Handle<v8::internal::HeapObject>, int, int) [node]
26: 0x157c5d8 v8::internal::Deserializer<v8::internal::Isolate>::ReadObject(v8::internal::SnapshotSpace) [node]
27: 0x157b1db int v8::internal::Deserializer<v8::internal::Isolate>::ReadSingleBytecodeData<v8::internal::SlotAccessorForHeapObject>(unsigned char, v8::internal::SlotAccessorForHeapObject) [node]
28: 0x157c311 v8::internal::Deserializer<v8::internal::Isolate>::ReadData(v8::internal::Handle<v8::internal::HeapObject>, int, int) [node]
29: 0x157c5d8 v8::internal::Deserializer<v8::internal::Isolate>::ReadObject(v8::internal::SnapshotSpace) [node]
30: 0x157c8b9 int v8::internal::Deserializer<v8::internal::Isolate>::ReadSingleBytecodeData<v8::internal::SlotAccessorForHandle<v8::internal::Isolate> >(unsigned char, v8::internal::SlotAccessorForHandle<v8::internal::Isolate>) [node]
31: 0x157d1bf v8::internal::Deserializer<v8::internal::Isolate>::ReadObject() [node]
32: 0x1581d52 v8::internal::ObjectDeserializer::Deserialize() [node]
33: 0x1581f64 v8::internal::ObjectDeserializer::DeserializeSharedFunctionInfo(v8::internal::Isolate*, v8::internal::SerializedCodeData const*, v8::internal::Handle<v8::internal::String>) [node]
34: 0x1574ca2 v8::internal::CodeSerializer::Deserialize(v8::internal::Isolate*, v8::internal::AlignedCachedData*, v8::internal::Handle<v8::internal::String>, v8::ScriptOriginOptions, v8::internal::MaybeHandle<v8::internal::Script>) [node]
35: 0xfce38b  [node]
36: 0xfce66d v8::internal::Compiler::GetSharedFunctionInfoForScriptWithCachedData(v8::internal::Isolate*, v8::internal::Handle<v8::internal::String>, v8::internal::ScriptDetails const&, v8::internal::AlignedCachedData*, v8::ScriptCompiler::CompileOptions, v8::ScriptCompiler::NoCacheReason, v8::internal::NativesFlag) [node]
37: 0xf2e47c  [node]
38: 0xf2e588 v8::ScriptCompiler::CompileUnboundScript(v8::Isolate*, v8::ScriptCompiler::Source*, v8::ScriptCompiler::CompileOptions, v8::ScriptCompiler::NoCacheReason) [node]
39: 0xcb4741 node::contextify::ContextifyScript::New(v8::FunctionCallbackInfo<v8::Value> const&) [node]
40: 0xf6c56f v8::internal::FunctionCallbackArguments::Call(v8::internal::CallHandlerInfo) [node]
41: 0xf6cb25  [node]
42: 0xf6d243 v8::internal::Builtin_HandleApiCall(int, unsigned long*, v8::internal::Isolate*) [node]
43: 0x1977df6  [node]
Trace/breakpoint trap (core dumped)

Additional information

https://github.com/appium/appium/actions/runs/13968154479/job/39103261330?pr=21119#step:5:1487

[bnoordhuis]

At first glance it looks like random memory or snapshot corruption: V8 encounters invalid bytecodes when unpacking a code snapshot.

Could be a node bug, could be something else, impossible to tell with the information at hand. Where do you get the node binary from?

Try starting node with node --trace_deserialization, maybe that prints something useful.

[bnoordhuis]

No follow-up, closing.

[mykola-mokhnach]

I've tried to reproduce it, but the issue is completely random. No luck so far.

If there is no way to address the issue based on the above stacktrace then 🤷

Thanks for checking anyway.