Bug 78153 – Assertion failure under JSC::DFG::AbstractState::execute loading economist.com

• Component: JavaScriptCore
• Status: RESOLVED FIXED

[Antti Koivisto]

Loading economist.com with ToT debug build I get

ASSERTION FAILED: node.op == ValueAdd
/Users/antti/webkit/OpenSource/Source/JavaScriptCore/dfg/DFGAbstractState.cpp(279) : bool JSC::DFG::AbstractState::execute(NodeIndex)
1   0x102ad3c26 JSC::DFG::AbstractState::execute(unsigned int)
2   0x102b331f9 JSC::DFG::Propagator::performBlockCFA(JSC::DFG::AbstractState&, unsigned int)
3   0x102b33139 JSC::DFG::Propagator::performForwardCFA(JSC::DFG::AbstractState&)
4   0x102b330b7 JSC::DFG::Propagator::globalCFA()
5   0x102b32ac6 JSC::DFG::Propagator::fixpoint()
6   0x102b32934 JSC::DFG::propagate(JSC::DFG::Graph&, JSC::JSGlobalData*, JSC::CodeBlock*)
7   0x102b0dfac JSC::DFG::compile(JSC::DFG::CompileMode, JSC::JSGlobalData&, JSC::CodeBlock*, JSC::JITCode&, JSC::MacroAssemblerCodePtr*)
8   0x102b0ddc4 JSC::DFG::tryCompileFunction(JSC::JSGlobalData&, JSC::CodeBlock*, JSC::JITCode&, JSC::MacroAssemblerCodePtr&)
9   0x102ba01b6 JSC::jitCompileFunctionIfAppropriate(JSC::JSGlobalData&, WTF::OwnPtr<JSC::FunctionCodeBlock>&, JSC::JITCode&, JSC::MacroAssemblerCodePtr&, JSC::SharedSymbolTable*&, JSC::JITCode::JITType)
10  0x102b9c357 JSC::FunctionExecutable::compileForCallInternal(JSC::ExecState*, JSC::ScopeChainNode*, JSC::JITCode::JITType)
11  0x102b9bf14 JSC::FunctionExecutable::compileOptimizedForCall(JSC::ExecState*, JSC::ScopeChainNode*)
12  0x102aa3c11 JSC::FunctionExecutable::compileOptimizedFor(JSC::ExecState*, JSC::ScopeChainNode*, JSC::CodeSpecializationKind)
13  0x102a9de0b JSC::FunctionCodeBlock::compileOptimized(JSC::ExecState*, JSC::ScopeChainNode*)
14  0x102c03a6d cti_optimize_from_ret
15  0x102c0c4d0 jscGeneratedNativeCode
16  0x102bcf879 JSC::JITCode::execute(JSC::RegisterFile*, JSC::ExecState*, JSC::JSGlobalData*)
17  0x102bcb7de JSC::Interpreter::execute(JSC::ProgramExecutable*, JSC::ExecState*, JSC::ScopeChainNode*, JSC::JSObject*)
18  0x102ab8612 JSC::evaluate(JSC::ExecState*, JSC::ScopeChainNode*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*)
19  0x1042315b1 WebCore::JSMainThreadExecState::evaluate(JSC::ExecState*, JSC::ScopeChainNode*, JSC::SourceCode const&, JSC::JSValue, JSC::JSValue*)
20  0x10498699f WebCore::ScriptController::evaluateInWorld(WebCore::ScriptSourceCode const&, WebCore::DOMWrapperWorld*)
21  0x104986b04 WebCore::ScriptController::evaluate(WebCore::ScriptSourceCode const&)
22  0x10499d803 WebCore::ScriptElement::executeScript(WebCore::ScriptSourceCode const&)
23  0x10499db37 WebCore::ScriptElement::execute(WebCore::CachedScript*)
24  0x1049adbcd WebCore::ScriptRunner::timerFired(WebCore::Timer<WebCore::ScriptRunner>*)
25  0x1049b1a63 WebCore::Timer<WebCore::ScriptRunner>::fired()
26  0x104c00ee7 WebCore::ThreadTimers::sharedTimerFiredInternal()
27  0x104c00cb9 WebCore::ThreadTimers::sharedTimerFired()
28  0x104a08123 _ZN7WebCoreL10timerFiredEP16__CFRunLoopTimerPv
29  0x7fff9332bc24 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__
30  0x7fff9332b776 __CFRunLoopDoTimer
31  0x7fff9330c001 __CFRunLoopRun

[Filip Pizlo]

Fascinating!

Sorry I'm looking at this just now, I've been AFK for a week.  Do you recall what revision it was?  No worries if not.  Will try to repro on current ToT.

[Antti Koivisto]

This still occurs for me with the current ToT.

[Filip Pizlo]

(In reply to comment #2)
> This still occurs for me with the current ToT.

Great, thanks

[Filip Pizlo]

<rdar://problem/10861712>

[Filip Pizlo]

Fix is easy.  Patch forthcoming.

[Filip Pizlo]

Created attachment 126999 [details]
the patch

[Filip Pizlo]

Landed in http://trac.webkit.org/changeset/107732

[WebKit Review Bot]

Attachment 126999 [details] did not pass style-queue:

Failed to run "['Tools/Scripts/update-webkit']" exit_code: 9

Updating OpenSource
First, rewinding head to replay your work on top of it...
Applying: [Mac][Win][WK2] Switch to RFC 6455 protocol for WebSockets
Using index info to reconstruct a base tree...
<stdin>:1578: trailing whitespace.
        
<stdin>:1647: trailing whitespace.
    
<stdin>:1657: trailing whitespace.
    
<stdin>:1672: trailing whitespace.
        return 0;        
<stdin>:1674: trailing whitespace.
    
warning: squelched 7 whitespace errors
warning: 12 lines add whitespace errors.
Falling back to patching base and 3-way merge...
warning: too many files (created: 168753 deleted: 3), skipping inexact rename detection
Auto-merging LayoutTests/ChangeLog
CONFLICT (content): Merge conflict in LayoutTests/ChangeLog
Auto-merging LayoutTests/platform/wk2/Skipped
Auto-merging Source/WebCore/ChangeLog
Auto-merging Source/WebCore/css/CSSCalculationValue.cpp
Auto-merging Source/WebCore/css/CSSCalculationValue.h
Auto-merging Source/WebCore/css/CSSParser.cpp
Auto-merging Source/WebKit/mac/ChangeLog
CONFLICT (content): Merge conflict in Source/WebKit/mac/ChangeLog
Auto-merging Source/WebKit2/ChangeLog
CONFLICT (content): Merge conflict in Source/WebKit2/ChangeLog
Auto-merging Tools/ChangeLog
CONFLICT (content): Merge conflict in Tools/ChangeLog
Failed to merge in the changes.
Patch failed at 0001 [Mac][Win][WK2] Switch to RFC 6455 protocol for WebSockets

When you have resolved this problem run "git rebase --continue".
If you would prefer to skip this patch, instead run "git rebase --skip".
To restore the original branch and stop rebasing run "git rebase --abort".

rebase refs/remotes/origin/master: command returned error: 1

Died at Tools/Scripts/update-webkit line 164.


If any of these errors are false positives, please file a bug against check-webkit-style.