Debugger crash where octal escape sequences exists #61917
Description
Version
v25.6.1
Platform
Linux lenovo 6.18.9-arch1-2 #1 SMP PREEMPT_DYNAMIC Mon, 09 Feb 2026 17:16:33 +0000 x86_64 GNU/Linux
Subsystem
Debugger
What steps will reproduce the bug?
(the weird this is that I could not reproduce this using vscode debugging, or within a simple script)
I can't provide more info about my project (it's organizational) other than these screenshots from code
How often does it reproduce? Is there a required condition?
the required condition in my project is \033, I tried with \x1b, it does not crash.
happens always
What is the expected behavior? Why is that the expected behavior?
it should not crash
What do you see instead?
a crash with segmentation violation
Additional information
I could extract the backtrace using gdb and analyzing the core dump file:
#0 v8::internal::Variable::set_is_used (this=0x0) at ../deps/v8/src/ast/variables.h:87
#1 v8::internal::ParserBase<v8::internal::Parser>::UseThis (this=0x7ffc149672e0) at ../deps/v8/src/parsing/parser-base.h:1286
#2 v8::internal::Parser::ThisExpression (this=0x7ffc149672e0) at ../deps/v8/src/parsing/parser.h:791
#3 v8::internal::ParserBase<v8::internal::Parser>::ParsePrimaryExpression (this=0x7ffc149672e0) at ../deps/v8/src/parsing/parser-base.h:2195
#4 0x0000560c1fe2e62d in v8::internal::ParserBase<v8::internal::Parser>::ParseMemberExpression (this=0x7ffc149672e0) at ../deps/v8/src/parsing/parser-base.h:4159
#5 v8::internal::ParserBase<v8::internal::Parser>::ParseLeftHandSideExpression (this=0x7ffc149672e0) at ../deps/v8/src/parsing/parser-base.h:3881
#6 v8::internal::ParserBase<v8::internal::Parser>::ParsePostfixExpression (this=0x7ffc149672e0) at ../deps/v8/src/parsing/parser-base.h:3848
#7 v8::internal::ParserBase<v8::internal::Parser>::ParseUnaryExpression (this=0x7ffc149672e0) at ../deps/v8/src/parsing/parser-base.h:3838
#8 v8::internal::ParserBase<v8::internal::Parser>::ParseBinaryExpression (this=0x7ffc149672e0, prec=6) at ../deps/v8/src/parsing/parser-base.h:3716
#9 v8::internal::ParserBase<v8::internal::Parser>::ParseLogicalExpression (this=this@entry=0x7ffc149672e0) at ../deps/v8/src/parsing/parser-base.h:3486
#10 0x0000560c1fe2f13f in v8::internal::ParserBase<v8::internal::Parser>::ParseConditionalExpression (this=0x7ffc149672e0) at ../deps/v8/src/parsing/scanner.h:743
#11 v8::internal::ParserBase<v8::internal::Parser>::ParseAssignmentExpressionCoverGrammar (this=this@entry=0x7ffc149672e0) at ../deps/v8/src/parsing/parser-base.h:3255
#12 0x0000560c1fe3c5d9 in v8::internal::ParserBase<v8::internal::Parser>::ParseExpressionCoverGrammar (this=this@entry=0x7ffc149672e0)
at ../deps/v8/src/parsing/parser-base.h:2335
#13 0x0000560c1fe4e4b5 in v8::internal::ParserBase<v8::internal::Parser>::ParseExpressionOrLabelledStatement (this=this@entry=0x7ffc149672e0, labels=<optimized out>,
own_labels=<optimized out>, allow_function=v8::internal::kAllowLabelledFunctionStatement) at ../deps/v8/src/parsing/parser-base.h:6052
#14 0x0000560c1fe33412 in v8::internal::ParserBase<v8::internal::Parser>::ParseStatement (this=this@entry=0x7ffc149672e0, labels=labels@entry=0x0,
own_labels=own_labels@entry=0x0, allow_function=allow_function@entry=v8::internal::kAllowLabelledFunctionStatement) at ../deps/v8/src/parsing/parser-base.h:5894
#15 0x0000560c1fe34e91 in v8::internal::ParserBase<v8::internal::Parser>::ParseStatementListItem (this=this@entry=0x7ffc149672e0)
at ../deps/v8/src/parsing/parser-base.h:5789
#16 0x0000560c1fe49289 in v8::internal::ParserBase<v8::internal::Parser>::ParseStatementList (this=0x7ffc149672e0, body=0x7ffc14967150,
end_token=v8::internal::Token::kEos) at ../deps/v8/src/parsing/parser-base.h:5717
#17 v8::internal::Parser::DoParseProgram (this=this@entry=0x7ffc149672e0, isolate=isolate@entry=0x560c54c56000, info=info@entry=0x7ffc14967d30)
at ../deps/v8/src/parsing/parser.cc:808
#18 0x0000560c1fe4a297 in v8::internal::Parser::ParseProgram (this=this@entry=0x7ffc149672e0, isolate=isolate@entry=0x560c54c56000, script=script@entry=...,
info=info@entry=0x7ffc14967d30, maybe_outer_scope_info=..., maybe_outer_scope_info@entry=...) at ../deps/v8/src/parsing/parser.cc:723
#19 0x0000560c1fe4e940 in v8::internal::parsing::ParseProgram (info=info@entry=0x7ffc14967d30, script=script@entry=..., maybe_outer_scope_info=...,
maybe_outer_scope_info@entry=..., isolate=isolate@entry=0x560c54c56000, mode=mode@entry=v8::internal::parsing::ReportStatisticsMode::kYes)
at ../deps/v8/src/parsing/parsing.cc:57
#20 0x0000560c1f8e2405 in v8::internal::(anonymous namespace)::CompileToplevel (parse_info=parse_info@entry=0x7ffc14967d30, script=..., maybe_outer_scope_info=...,
maybe_outer_scope_info@entry=..., isolate=isolate@entry=0x560c54c56000, is_compiled_scope=is_compiled_scope@entry=0x7ffc14967c40)
at ../deps/v8/src/handles/handles.h:667
#21 0x0000560c1f8e2c98 in v8::internal::Compiler::GetFunctionFromEval (isolate=isolate@entry=0x560c54c56000, source=..., outer_info=..., context=...,
language_mode=language_mode@entry=v8::internal::LanguageMode::kSloppy, restriction=restriction@entry=v8::internal::NO_PARSE_RESTRICTION,
parameters_end_pos=<optimized out>, eval_position=<optimized out>, parsing_while_debugging=<optimized out>) at ../deps/v8/src/codegen/compiler.cc:3315
#22 0x0000560c1f938a38 in v8::internal::DebugEvaluate::Evaluate (isolate=isolate@entry=0x560c54c56000, outer_info=..., context=..., context@entry=...,
receiver=receiver@entry=..., source=..., source@entry=..., throw_on_side_effect=throw_on_side_effect@entry=false) at ../deps/v8/src/debug/debug-evaluate.cc:180
#23 0x0000560c1f9399e3 in v8::internal::DebugEvaluate::Local (isolate=0x560c54c56000, frame_id=<optimized out>, inlined_jsframe_index=inlined_jsframe_index@entry=0,
source=..., throw_on_side_effect=throw_on_side_effect@entry=false) at ../deps/v8/src/debug/debug-evaluate.cc:123
#24 0x0000560c1f94a3b2 in v8::internal::DebugStackTraceIterator::Evaluate (this=0x560c54ec9090, source=..., throw_on_side_effect=false)
at ../deps/v8/src/debug/debug-stack-trace-iterator.cc:264
#25 0x0000560c1fff7f32 in v8_inspector::V8DebuggerAgentImpl::evaluateOnCallFrame (this=0x560c54d14910, callFrameId=..., expression=..., objectGroup=std::optional = {...},
includeCommandLineAPI=..., silent=..., returnByValue=std::optional [no contained value], generatePreview=std::optional = {...}, throwOnSideEffect=...,
timeout=std::optional [no contained value], result=0x7ffc14968418, exceptionDetails=0x7ffc14968420) at ../deps/v8/src/inspector/v8-debugger-agent-impl.cc:1602
#26 0x0000560c2007fe49 in v8_inspector::protocol::Debugger::DomainDispatcherImpl::evaluateOnCallFrame (this=<optimized out>, dispatchable=...)
at /usr/src/debug/nodejs/node/out/Release/obj/gen/inspector-generated-output-root/src/inspector/protocol/Debugger.cpp:728
--Type <RET> for more, q to quit, c to continue without paging--
#27 0x0000560c20056052 in std::function<void()>::operator() (this=0x7ffc14968758) at /usr/include/c++/15.2.1/bits/std_function.h:593
#28 v8_crdtp::UberDispatcher::DispatchResult::Run (this=this@entry=0x7ffc14968750) at ../deps/v8/third_party/inspector_protocol/crdtp/dispatch.cc:509
#29 0x0000560c20019453 in v8_inspector::V8InspectorSessionImpl::dispatchProtocolMessage (this=0x560c54d05420, message=...)
at ../deps/v8/src/inspector/v8-inspector-session-impl.cc:388
#30 0x0000560c1f71afda in node::inspector::(anonymous namespace)::ChannelImpl::dispatchProtocolMessage (this=0x560c54d19130, message=...) at ../src/inspector_agent.cc:328
#31 node::inspector::NodeInspectorClient::dispatchMessageFromFrontend (this=<optimized out>, session_id=<optimized out>, message=...) at ../src/inspector_agent.cc:641
#32 node::inspector::(anonymous namespace)::SameThreadInspectorSession::Dispatch (this=<optimized out>, message=...) at ../src/inspector_agent.cc:1288
#33 0x0000560c1f74079a in node::inspector::(anonymous namespace)::MainThreadSessionState::Dispatch (this=<optimized out>, message=...)
at ../src/inspector/main_thread_interface.cc:149
#34 0x0000560c1f73e963 in node::inspector::(anonymous namespace)::AnotherThreadObjectReference<node::inspector::(anonymous namespace)::MainThreadSessionState>::Apply<std::unique_ptr<v8_inspector::StringBuffer> > (target=<optimized out>, fn=<optimized out>, argument=...) at /usr/include/c++/15.2.1/bits/unique_ptr.h:190
#35 0x0000560c1f73ed34 in node::inspector::MainThreadInterface::DispatchMessages (this=0x560c54d17120) at ../src/inspector/main_thread_interface.cc:259
#36 0x0000560c1f73ef25 in operator() (__closure=<optimized out>) at ../src/inspector/main_thread_interface.cc:215
#37 node::CallbackQueue<void, node::Environment*>::CallbackImpl<node::inspector::MainThreadInterface::Post(std::unique_ptr<node::inspector::Request>)::<lambda(node::Environment*)> >::Call(node::Environment *) (this=<optimized out>, args#0=<optimized out>) at ../src/callback_queue-inl.h:90
#38 0x0000560c1f4570fc in node::Environment::RunAndClearInterrupts (this=0x560c54cdbf90) at ../src/env.cc:1396
#39 0x0000560c1f7215bc in node::inspector::NodeInspectorClient::runMessageLoop (this=0x560c54d07b90) at ../src/inspector_agent.cc:798
#40 node::inspector::NodeInspectorClient::runMessageLoopOnPause (this=0x560c54d07b90, context_group_id=<optimized out>) at ../src/inspector_agent.cc:527
#41 0x0000560c200002cd in v8_inspector::V8Debugger::handleProgramBreak (this=0x560c54ce9300, pausedContext=..., exception=exception@entry=..., breakpointIds=...,
breakReasons=..., exceptionType=<optimized out>, exceptionType@entry=v8::debug::kException, isUncaught=<optimized out>) at ../deps/v8/src/inspector/v8-debugger.cc:552
#42 0x0000560c2000038e in v8_inspector::V8Debugger::BreakProgramRequested (this=<optimized out>, pausedContext=..., break_points_hit=..., reasons=...)
at ../deps/v8/src/inspector/v8-debugger.cc:678
#43 0x0000560c1f958102 in v8::internal::Debug::OnDebugBreak (this=this@entry=0x560c54c68000, break_points_hit=..., break_points_hit@entry=...,
lastStepAction=<optimized out>, break_reasons=..., break_reasons@entry=...) at ../deps/v8/src/debug/debug.cc:2640
#44 0x0000560c1f95853a in v8::internal::Debug::Break (this=this@entry=0x560c54c68000, frame=<optimized out>, break_target=...) at ../deps/v8/src/handles/handles.h:667
#45 0x0000560c1ff1a6a1 in v8::internal::__RT_impl_Runtime_DebugBreakOnBytecode (args=..., isolate=0x560c54c56000) at ../deps/v8/src/execution/frames.h:1727
#46 v8::internal::Runtime_DebugBreakOnBytecode (args_length=<optimized out>, args_object=<optimized out>, isolate=0x560c54c56000)
at ../deps/v8/src/runtime/runtime-debug.cc:35
#47 0x00007f1d6de3ac76 in ?? ()
#48 0x00007ffc14968ef0 in ?? ()
#49 0x0000000000000006 in ?? ()
... about 200 more frames ...