René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"NodeJS segfaults when trying to debug this code","articleBody":"### Version\n\nv24.10.0\n\n### Platform\n\n```text\nLinux nix-desktop-evo4b5 6.17.5 #1-NixOS SMP PREEMPT_DYNAMIC Thu Oct 23 14:24:41 UTC 2025 x86_64 GNU/Linux\n```\n\n### Subsystem\n\n_No response_\n\n### What steps will reproduce the bug?\n\n```js\nfunction crash() {\n    const thing = [];\n    const otherThing = [];\n    // set your breakpoint on line 5, the line starting with for (...), and attempt to step into the loop\n    for (const item in thing) {\n        otherThing.map(() =\u003e item);\n    }\n}\n\ncrash()\n```\n\n### How often does it reproduce? Is there a required condition?\n\ni can reproduce it 100% of the time\n\n### What is the expected behavior? Why is that the expected behavior?\n\nnodejs does not segfault while debugging\n\n### What do you see instead?\n\nnodejs segfaults while debugging\n\n### Additional information\n\nthis does not happen when i debug the script while its running in the browser (Chromium 141.0.7390.122)\n\n\u003cdetails\u003e\u003csummary\u003ebacktrace from coredump\u003c/summary\u003e\n\u003cp\u003e\n\n```\n#0  0x0000560f095a63f4 in v8::internal::ScopeIterator::UnwrapEvaluationContext() ()\n#1  0x0000560f095a4d24 in v8::internal::DebugScopeIterator::Advance() ()\n#2  0x0000560f09cdfa15 in v8_inspector::V8DebuggerAgentImpl::currentCallFrames(std::unique_ptr\u003cstd::vector\u003cstd::unique_ptr\u003cv8_inspector::protocol::Debugger::CallFrame, std::default_delete\u003cv8_inspector::protocol::Debugger::CallFrame\u003e \u003e, std::allocator\u003cstd::unique_ptr\u003cv8_inspector::protocol::Debugger::CallFrame, std::default_delete\u003cv8_inspector::protocol::Debugger::CallFrame\u003e \u003e \u003e \u003e, std::default_delete\u003cstd::vector\u003cstd::unique_ptr\u003cv8_inspector::protocol::Debugger::CallFrame, std::default_delete\u003cv8_inspector::protocol::Debugger::CallFrame\u003e \u003e, std::allocator\u003cstd::unique_ptr\u003cv8_inspector::protocol::Debugger::CallFrame, std::default_delete\u003cv8_inspector::protocol::Debugger::CallFrame\u003e \u003e \u003e \u003e \u003e \u003e*) ()\n#3  0x0000560f09ce5fa5 in v8_inspector::V8DebuggerAgentImpl::didPause(int, v8::Local\u003cv8::Value\u003e, std::vector\u003cint, std::allocator\u003cint\u003e \u003e const\u0026, v8::debug::ExceptionType, bool, v8::base::EnumSet\u003cv8::debug::BreakReason, int\u003e) ()\n#4  0x0000560f09ced8b8 in std::_Function_handler\u003cvoid (v8_inspector::V8InspectorSessionImpl*), v8_inspector::V8Debugger::handleProgramBreak(v8::Local\u003cv8::Context\u003e, v8::Local\u003cv8::Value\u003e, std::vector\u003cint, std::allocator\u003cint\u003e \u003e const\u0026, v8::base::EnumSet\u003cv8::debug::BreakReason, int\u003e, v8::debug::ExceptionType, bool)::{lambda(v8_inspector::V8InspectorSessionImpl*)#2}\u003e::_M_invoke(std::_Any_data const\u0026, v8_inspector::V8InspectorSessionImpl*\u0026\u0026) ()\n#5  0x0000560f09d022c3 in v8_inspector::V8InspectorImpl::forEachSession(int, std::function\u003cvoid (v8_inspector::V8InspectorSessionImpl*)\u003e const\u0026) ()\n#6  0x0000560f09cf096e in v8_inspector::V8Debugger::handleProgramBreak(v8::Local\u003cv8::Context\u003e, v8::Local\u003cv8::Value\u003e, std::vector\u003cint, std::allocator\u003cint\u003e \u003e const\u0026, v8::base::EnumSet\u003cv8::debug::BreakReason, int\u003e, v8::debug::ExceptionType, bool) ()\n#7  0x0000560f09cf0afa in v8_inspector::V8Debugger::BreakProgramRequested(v8::Local\u003cv8::Context\u003e, std::vector\u003cint, std::allocator\u003cint\u003e \u003e const\u0026, v8::base::EnumSet\u003cv8::debug::BreakReason, int\u003e) ()\n#8  0x0000560f095baab2 in v8::internal::Debug::OnDebugBreak(v8::internal::DirectHandle\u003cv8::internal::FixedArray\u003e, v8::internal::StepAction, v8::base::EnumSet\u003cv8::debug::BreakReason, int\u003e) ()\n#9  0x0000560f095baf2c in v8::internal::Debug::Break(v8::internal::JavaScriptFrame*, v8::internal::DirectHandle\u003cv8::internal::JSFunction\u003e) ()\n#10 0x0000560f09bf6203 in v8::internal::Runtime_DebugBreakOnBytecode(int, unsigned long*, v8::internal::Isolate*) ()\n#11 0x00007f6837e76876 in ?? ()\n#12 0x0000560f38837aa0 in ?? ()\n#13 0x00007fff61397cf0 in ?? ()\n```\n\n\u003c/p\u003e\n\u003c/details\u003e \n","author":{"url":"https://github.com/sadan4","@type":"Person","name":"sadan4"},"datePublished":"2025-11-05T02:06:42.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/60580/node/issues/60580"}