[jsc-dev] Crashing on iOS 9
Saam Barati
sbarati at apple.com
Sun Feb 5 20:09:39 PST 2017
If you're not able to get a smaller reduced test case, it'd be great if you can send me what you have and steps to reproduce. (You can send me the project off-list as well.) I've spent some time trying to reproduce a crash like this.
Are you linking your app against a modified JSC? Or does this crash happen when linking against the system's JSC as well?
- Saam
> On Feb 5, 2017, at 7:58 PM, shuan zhao <hszhsh at icloud.com> wrote:
>
> Thanks for your reply. I changed to a debug version of JSC build, and the stack looks a little different. It seems that source.provider()->source() became empty for some reason. The weird thing is that the crash did not happen when launched with “Malloc Scribble” or “Malloc Guard Edges” in Xcode.
>
> My project is complicated, so it’s hard to say how to reproduce this. But I will try to reproduce the crash with a simplified project, and report the steps later.
>
>
> #0 0x00000001017515e0 in ::WTFCrash() at /Users/hoolai/WebKit-GIT/Source/WTF/wtf/Assertions.cpp:379
> #1 0x000000010162887c in std::__1::unique_ptr<JSC::FunctionNode, std::__1::default_delete<JSC::FunctionNode> > JSC::parse<JSC::FunctionNode>(JSC::VM*, JSC::SourceCode const&, JSC::Identifier const&, JSC::JSParserBuiltinMode, JSC::JSParserStrictMode, JSC::JSParserScriptMode, JSC::SourceParseMode, JSC::SuperBinding, JSC::ParserError&, JSC::JSTextPosition*, JSC::ConstructorKind, JSC::DerivedContextType, JSC::EvalContextType, JSC::DebuggerParseData*) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/parser/Parser.h:1877
> #2 0x0000000101627db8 in JSC::generateUnlinkedFunctionCodeBlock(JSC::VM&, JSC::UnlinkedFunctionExecutable*, JSC::SourceCode const&, JSC::CodeSpecializationKind, JSC::DebuggerMode, JSC::UnlinkedFunctionKind, JSC::ParserError&, JSC::SourceParseMode) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/bytecode/UnlinkedFunctionExecutable.cpp:56
> #3 0x0000000101627b80 in JSC::UnlinkedFunctionExecutable::unlinkedCodeBlockFor(JSC::VM&, JSC::SourceCode const&, JSC::CodeSpecializationKind, JSC::DebuggerMode, JSC::ParserError&, JSC::SourceParseMode) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/bytecode/UnlinkedFunctionExecutable.cpp:210
> #4 0x000000010157e2f0 in JSC::ScriptExecutable::newCodeBlockFor(JSC::CodeSpecializationKind, JSC::JSFunction*, JSC::JSScope*, JSC::JSObject*&) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/runtime/ScriptExecutable.cpp:217
> #5 0x000000010157f3cc in JSC::ScriptExecutable::prepareForExecutionImpl(JSC::VM&, JSC::JSFunction*, JSC::JSScope*, JSC::CodeSpecializationKind, JSC::CodeBlock*&) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/runtime/ScriptExecutable.cpp:310
> #6 0x0000000101130340 in JSC::JSObject* JSC::ScriptExecutable::prepareForExecution<JSC::FunctionExecutable>(JSC::VM&, JSC::JSFunction*, JSC::JSScope*, JSC::CodeSpecializationKind, JSC::CodeBlock*&) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/bytecode/CodeBlock.h:1095
> #7 0x00000001013711a0 in JSC::LLInt::setUpCall(JSC::ExecState*, JSC::Instruction*, JSC::CodeSpecializationKind, JSC::JSValue, JSC::LLIntCallLinkInfo*) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp:1304
> #8 0x00000001013703d4 in JSC::LLInt::genericCall(JSC::ExecState*, JSC::Instruction*, JSC::CodeSpecializationKind) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp:1354
> #9 0x00000001013702cc in ::llint_slow_path_call(JSC::ExecState *, JSC::Instruction *) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp:1361
> #10 0x0000000101381ba0 in llint_entry ()
> #11 0x0000000101381bb0 in llint_entry ()
> #12 0x0000000101381bb0 in llint_entry ()
> #13 0x000000010137b258 in llintPCRangeStart ()
> #14 0x0000000101178864 in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/jit/JITCode.cpp:81
> #15 0x00000001011301d4 in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/interpreter/Interpreter.cpp:927
> #16 0x0000000100afa078 in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/runtime/CallData.cpp:39
> #17 0x0000000100afa16c in JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/runtime/CallData.cpp:59
> #18 0x000000010128003c in ::JSObjectCallAsFunction(JSContextRef, JSObjectRef, JSObjectRef, size_t, const JSValueRef *, JSValueRef *) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/API/JSObjectRef.cpp:563
>
>
>> On 6 Feb 2017, at 1:36 AM, Geoffrey Garen <ggaren at apple.com> wrote:
>>
>> Hi Shuan.
>>
>> The backtrace you included does not remind me of Bug 160337, but it does remind me of another crash that we’d like to diagnose and fix.
>>
>> Do you think you could provide Saam instructions on how to reproduce this crash?
>>
>> Thanks,
>> Geoff
>>
>>> On Feb 5, 2017, at 1:32 AM, shuan zhao <hszhsh at icloud.com> wrote:
>>>
>>> I’m running apps embedding my own build of JavaScriptCore on iOS (using C APIs only). It runs well on iOS 10 but crashes on iOS 9 or iOS 8. I guess it will also crash on iOS 7 or earlier systems which I have not tested on.
>>>
>>> I found the bug (Bug 160337 - Crash in JavaScriptCore GC when using JSC on dispatch queues (thread_get_state returns NULL stack pointer)). But my case is totally different because I have never got null stack pointer from thread_get_state. And I found that when launched with the option “Malloc Scribble” or “Malloc Guard Edges” checked in Xcode, my app won’t crash any more.
>>>
>>> I have no idea what causes this crash. It would be very nice of you if you would give me some hints on the issue.
>>>
>>> Mostly the crash stack was as follows, but sometimes it was different. And sometimes it reported errors that should not exist and crashed later.
>>>
>>> #0 0x0000000100d66ca4 in JSC::Lexer<unsigned short>::setCode(JSC::SourceCode const&, JSC::ParserArena*) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/parser/Lexer.cpp:571
>>> #1 0x0000000100e037f8 in JSC::Parser<JSC::Lexer<unsigned short> >::Parser(JSC::VM*, JSC::SourceCode const&, JSC::JSParserBuiltinMode, JSC::JSParserStrictMode, JSC::JSParserScriptMode, JSC::SourceParseMode, JSC::SuperBinding, JSC::ConstructorKind, JSC::DerivedContextType, bool, JSC::EvalContextType, JSC::DebuggerParseData*) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/parser/Parser.cpp:125
>>> #2 0x0000000100e03c28 in JSC::Parser<JSC::Lexer<unsigned short> >::Parser(JSC::VM*, JSC::SourceCode const&, JSC::JSParserBuiltinMode, JSC::JSParserStrictMode, JSC::JSParserScriptMode, JSC::SourceParseMode, JSC::SuperBinding, JSC::ConstructorKind, JSC::DerivedContextType, bool, JSC::EvalContextType, JSC::DebuggerParseData*) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/parser/Parser.cpp:123
>>> #3 0x0000000100f3311c in std::__1::unique_ptr<JSC::FunctionNode, std::__1::default_delete<JSC::FunctionNode> > JSC::parse<JSC::FunctionNode>(JSC::VM*, JSC::SourceCode const&, JSC::Identifier const&, JSC::JSParserBuiltinMode, JSC::JSParserStrictMode, JSC::JSParserScriptMode, JSC::SourceParseMode, JSC::SuperBinding, JSC::ParserError&, JSC::JSTextPosition*, JSC::ConstructorKind, JSC::DerivedContextType, JSC::EvalContextType, JSC::DebuggerParseData*) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/parser/Parser.h:1890
>>> #4 0x0000000100f32b8c in JSC::generateUnlinkedFunctionCodeBlock(JSC::VM&, JSC::UnlinkedFunctionExecutable*, JSC::SourceCode const&, JSC::CodeSpecializationKind, JSC::DebuggerMode, JSC::UnlinkedFunctionKind, JSC::ParserError&, JSC::SourceParseMode) [inlined] at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/bytecode/UnlinkedFunctionExecutable.cpp:56
>>> #5 0x0000000100f32b4c in JSC::UnlinkedFunctionExecutable::unlinkedCodeBlockFor(JSC::VM&, JSC::SourceCode const&, JSC::CodeSpecializationKind, JSC::DebuggerMode, JSC::ParserError&, JSC::SourceParseMode) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/bytecode/UnlinkedFunctionExecutable.cpp:210
>>> #6 0x0000000100ee8518 in JSC::ScriptExecutable::newCodeBlockFor(JSC::CodeSpecializationKind, JSC::JSFunction*, JSC::JSScope*, JSC::JSObject*&) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/runtime/ScriptExecutable.cpp:217
>>> #7 0x0000000100ee8bc8 in JSC::ScriptExecutable::prepareForExecutionImpl(JSC::VM&, JSC::JSFunction*, JSC::JSScope*, JSC::CodeSpecializationKind, JSC::CodeBlock*&) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/runtime/ScriptExecutable.cpp:310
>>> #8 0x0000000100da0cd4 in JSC::JSObject* JSC::ScriptExecutable::prepareForExecution<JSC::FunctionExecutable>(JSC::VM&, JSC::JSFunction*, JSC::JSScope*, JSC::CodeSpecializationKind, JSC::CodeBlock*&) [inlined] at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/bytecode/CodeBlock.h:1095
>>> #9 0x0000000100da0cbc in JSC::LLInt::setUpCall(JSC::ExecState*, JSC::Instruction*, JSC::CodeSpecializationKind, JSC::JSValue, JSC::LLIntCallLinkInfo*) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp:1304
>>> #10 0x0000000100daa270 in llint_entry ()
>>> #11 0x0000000100da9e84 in llint_entry ()
>>> #12 0x0000000100da9ee8 in llint_entry ()
>>> #13 0x0000000100da35f8 in vmEntryToJavaScript ()
>>> #14 0x0000000100c4defc in JSC::JITCode::execute(JSC::VM*, JSC::ProtoCallFrame*) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/jit/JITCode.cpp:81
>>> #15 0x0000000100c20fc0 in JSC::Interpreter::executeCall(JSC::ExecState*, JSC::JSObject*, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/interpreter/Interpreter.cpp:927
>>> #16 0x00000001008d8000 in JSC::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) [inlined] at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/runtime/CallData.cpp:39
>>> #17 0x00000001008d7fd0 in JSC::profiledCall(JSC::ExecState*, JSC::ProfilingReason, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/runtime/CallData.cpp:59
>>> #18 0x0000000100cecb38 in ::JSObjectCallAsFunction(JSContextRef, JSObjectRef, JSObjectRef, size_t, const JSValueRef *, JSValueRef *) at /Users/hoolai/WebKit-GIT/Source/JavaScriptCore/API/JSObjectRef.cpp:563
>>>
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>>
>
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