Bug 22287 – ASSERTION FAILED: Not enough jumps linked in slow case codegen in CTI::privateCompileSlowCases())

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Jim Oase]

Select this site and it will crash in seconds   http://www.foxnews.com/specialreport/index.html

I am using Webkit build  r38386

[Matt Lilek]

Confirmed with r38440:

ASSERTION FAILED: Not enough jumps linked in slow case codegen.
(iter + 1) == m_slowCases.end() || firstTo != (iter + 1)->to
(/Users/matt/Code/WebKit/JavaScriptCore/VM/CTI.cpp:2995 void JSC::CTI::privateCompileSlowCases())

Thread 0 Crashed:
0   com.apple.JavaScriptCore      	0x0057293e JSC::CTI::privateCompileSlowCases() + 15856 (CTI.cpp:2995)
1   com.apple.JavaScriptCore      	0x0057aa77 JSC::CTI::privateCompile() + 315 (CTI.cpp:3035)
2   com.apple.JavaScriptCore      	0x00542ce7 JSC::CTI::compile(JSC::JSGlobalData*, JSC::CodeBlock*) + 45 (CTI.h:289)
3   com.apple.JavaScriptCore      	0x00529479 JSC::BytecodeInterpreter::cti_op_call_JSFunction(void*, ...) + 211 (Machine.cpp:4693)
4   com.apple.JavaScriptCore      	0x00524126 jscGeneratedNativeCode + 0 (Machine.cpp:4261)
5   com.apple.JavaScriptCore      	0x0052af5d JSC::BytecodeInterpreter::execute(JSC::FunctionBodyNode*, JSC::ExecState*, JSC::JSFunction*, JSC::JSObject*, JSC::ArgList const&, JSC::ScopeChainNode*, JSC::JSValue**) + 789 (Machine.cpp:1008)
6   com.apple.JavaScriptCore      	0x004805bb JSC::JSFunction::call(JSC::ExecState*, JSC::JSValue*, JSC::ArgList const&) + 139 (JSFunction.cpp:83)
7   com.apple.JavaScriptCore      	0x0048066c JSC::call(JSC::ExecState*, JSC::JSValue*, JSC::CallType, JSC::CallData const&, JSC::JSValue*, JSC::ArgList const&) + 170 (CallData.cpp:39)
8   com.apple.JavaScriptCore      	0x0048e48a __ZN3JSCL22functionProtoFuncApplyEPNS_9ExecStateEPNS_8JSObjectEPNS_7JSValueERKNS_7ArgListE + 684 (FunctionPrototype.cpp:113)
9   com.apple.JavaScriptCore      	0x00529188 JSC::BytecodeInterpreter::cti_op_call_NotJSFunction(void*, ...) + 454 (Machine.cpp:4813)
10  com.apple.JavaScriptCore      	0x00524126 jscGeneratedNativeCode + 0 (Machine.cpp:4261)
11  com.apple.JavaScriptCore      	0x0052af5d JSC::BytecodeInterpreter::execute(JSC::FunctionBodyNode*, JSC::ExecState*, JSC::JSFunction*, JSC::JSObject*, JSC::ArgList const&, JSC::ScopeChainNode*, JSC::JSValue**) + 789 (Machine.cpp:1008)
12  com.apple.JavaScriptCore      	0x004805bb JSC::JSFunction::call(JSC::ExecState*, JSC::JSValue*, JSC::ArgList const&) + 139 (JSFunction.cpp:83)
13  com.apple.JavaScriptCore      	0x0048066c JSC::call(JSC::ExecState*, JSC::JSValue*, JSC::CallType, JSC::CallData const&, JSC::JSValue*, JSC::ArgList const&) + 170 (CallData.cpp:39)
14  com.apple.WebCore             	0x039934e9 WebCore::JSAbstractEventListener::handleEvent(WebCore::Event*, bool) + 793 (JSEventListener.cpp:110)

[Matt Lilek]

*** Bug 22291 has been marked as a duplicate of this bug. ***

[Cameron Zwarich (cpst)]

I am not sure if these two are really duplicates, because it may be for two different opcodes, but thanks a lot for finding this.

I'll assign this to myself.

[Matt Lilek]

(In reply to comment #3)
> I am not sure if these two are really duplicates, because it may be for two
> different opcodes, but thanks a lot for finding this.
> 

The stack traces for both bugs are identical once they enter JSCore (frame 13 and up).

[Matt Lilek]

(In reply to comment #4)
> The stack traces for both bugs are identical once they enter JSCore (frame 13
> and up).
> 

Actually, I should be more specific: the stacks aren't just identical, but also have the exact same line numbers in my debug build.

[Cameron Zwarich (cpst)]

(In reply to comment #5)
> (In reply to comment #4)
> > The stack traces for both bugs are identical once they enter JSCore (frame 13
> > and up).
> > 
> 
> Actually, I should be more specific: the stacks aren't just identical, but also
> have the exact same line numbers in my debug build.

That one assertion that is failing is responsible for checking quite a bit of code. It is the same class of bug, but a fix for one case may not fix the other, so I just made a note here to double check the other bug that got marked as a duplicate.

[Cameron Zwarich (cpst)]

Created attachment 25202 [details]
Reduction

Here is a reduction. It also works in the jsc shell.

[Jim Oase]

This page still crashes with build r38492

http://www.foxnews.com/specialreport/index.html

Animation on site does not work either
http://radar.weather.gov/Conus/full_loop.php

[Cameron Zwarich (cpst)]

I have a fix for this, but I might not be able to land it for a while because my MacBook Pro just died. :(

[Jim Oase]

Created attachment 25242 [details]
Crash log...

[Jim Oase]

Created attachment 25253 [details]
crash log

This crash occurred with nightly build r38586

[Cameron Zwarich (cpst)]

Thanks for the crash logs, but no additional crash logs are needed.

[Cameron Zwarich (cpst)]

This bug (along with all of the duplicates mentioned here) was fixed in r38590.