Bug 156997 – Crash under WebCore::MutationObserver::deliverAllMutations()

• Component: DOM
• Status: RESOLVED FIXED

[Chris Dumez]

Crash under WebCore::MutationObserver::deliverAllMutations():

Thread[0] EXC_BAD_ACCESS (SIGSEGV) (KERN_INVALID_ADDRESS at 0x00000000000000b0)
[  0] 0x00007fff84d4ddad WebCore`WebCore::MutationObserver::deliverAllMutations() [inlined] WTF::RefPtr<WebCore::MutationCallback>::operator->() const at ScriptExecutionContext.h:98
       94  	    virtual void suspendActiveDOMObjects(ActiveDOMObject::ReasonForSuspension);
       95  	    virtual void resumeActiveDOMObjects(ActiveDOMObject::ReasonForSuspension);
       96  	    virtual void stopActiveDOMObjects();
       97  	
    -> 98  	    bool activeDOMObjectsAreSuspended() const { return m_activeDOMObjectsAreSuspended; }
       99  	    bool activeDOMObjectsAreStopped() const { return m_activeDOMObjectsAreStopped; }
       100 	
       101 	    // Called from the constructor and destructors of ActiveDOMObject.
       102 	    void didCreateActiveDOMObject(ActiveDOMObject*);
    

     0x00007fff84d4dda0:     movq (%r15), %rax
     0x00007fff84d4dda3:     movq 0x8(%rax), %rdi
     0x00007fff84d4dda7:     movq (%rdi), %rax
     0x00007fff84d4ddaa:    callq *0x18(%rax)
 ->  0x00007fff84d4ddad:     cmpb $0x0, 0xb0(%rax)
     0x00007fff84d4ddb4:      jne 0x139eb1             ; <+433> at MutationObserver.cpp:221
     0x00007fff84d4ddba:     cmpb $0x1, 0xed44ef(%rip) ; WebCore::suspendedMutationObservers()::suspendedObservers + 7
     0x00007fff84d4ddc1:      jne 0x139dd0             ; <+208> [inlined] WebCore::suspendedMutationObservers() + 15 at MutationObserver.cpp:225
     0x00007fff84d4ddc3:     movq 0xed44de(%rip), %rbx ; WebCore::suspendedMutationObservers()::suspendedObservers

[  0] 0x00007fff84d4ddad WebCore`WebCore::MutationObserver::deliverAllMutations() [inlined] WTF::Vector<WTF::RefPtr<WebCore::MutationObserver>, 0ul, WTF::CrashOnOverflow>::operator[](unsigned long) + 25 at MutationObserver.cpp:184
       180 	}
       181 	
       182 	bool MutationObserver::canDeliver()
       183 	{
    -> 184 	    return !m_callback->scriptExecutionContext()->activeDOMObjectsAreSuspended();
       185 	}
       186 	
       187 	void MutationObserver::deliver()
       188 	{
    
[  0] 0x00007fff84d4dd94 WebCore`WebCore::MutationObserver::deliverAllMutations() + 148 at MutationObserver.cpp:222
       218 	    if (!suspendedMutationObservers().isEmpty()) {
       219 	        Vector<RefPtr<MutationObserver> > suspended;
       220 	        copyToVector(suspendedMutationObservers(), suspended);
       221 	        for (size_t i = 0; i < suspended.size(); ++i) {
    -> 222 	            if (!suspended[i]->canDeliver())
       223 	                continue;
       224 	
       225 	            suspendedMutationObservers().remove(suspended[i]);
       226 	            activeMutationObservers().add(suspended[i]);
    
[  1] 0x00007fff84e393df WebCore`WebCore::JSMainThreadExecState::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) [inlined] WebCore::JSMainThreadExecState::~JSMainThreadExecState() + 18 at JSMainThreadExecState.h:97
       93  	
       94  	        s_mainThreadState = m_previousState;
       95  	
       96  	        if (didExitJavaScript)
    -> 97  	            didLeaveScriptContext();
       98  	    }
       99  	
       100 	private:
       101 	    static JSC::ExecState* s_mainThreadState;
    

     0x00007fff84e393d1:       je 0x2253e2             ; <+178> [inlined] WebCore::JSMainThreadExecState::~JSMainThreadExecState() + 21 at JSMainThreadExecState.h:89
     0x00007fff84e393d3:     movq %r14, (%r15)
     0x00007fff84e393d6:    testq %r14, %r14
     0x00007fff84e393d9:      jne 0x2253e5             ; <+181> at JSMainThreadExecState.h:57
 ->  0x00007fff84e393db:    callq 0x13b9a0             ; WebCore::JSMainThreadExecState::didLeaveScriptContext at JSMainThreadExecState.cpp:39
     0x00007fff84e393e0:      jmp 0x2253e5             ; <+181> at JSMainThreadExecState.h:57
     0x00007fff84e393e2:     movq %r14, (%r15)
     0x00007fff84e393e5:     movq %rbx, %rax
     0x00007fff84e393e8:     addq $0x18, %rsp

[  1] 0x00007fff84e393cd WebCore`WebCore::JSMainThreadExecState::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) [inlined] WebCore::JSMainThreadExecState::~JSMainThreadExecState() at JSMainThreadExecState.h:89
[  1] 0x00007fff84e393cd WebCore`WebCore::JSMainThreadExecState::call(JSC::ExecState*, JSC::JSValue, JSC::CallType, JSC::CallData const&, JSC::JSValue, JSC::ArgList const&) + 157 at JSMainThreadExecState.h:57
[  2] 0x00007fff84e7db51 WebCore`WebCore::ScheduledAction::executeFunctionInContext(JSC::JSGlobalObject*, JSC::JSValue, WebCore::ScriptExecutionContext*) + 449 at ScheduledAction.cpp:111

     0x00007fff84e7db3c:     leaq -0x48(%rbp), %rcx
     0x00007fff84e7db40:     leaq -0xc0(%rbp), %r9
     0x00007fff84e7db47:     movq %rbx, %rdi
     0x00007fff84e7db4a:     movl %r13d, %edx
 ->  0x00007fff84e7db4d:    callq 0x225330             ; WebCore::JSMainThreadExecState::call at JSMainThreadExecState.h:51
     0x00007fff84e7db52:      jmp 0x269b81             ; <+497> [inlined] WebCore::InspectorInstrumentation::hasFrontends() at InspectorInstrumentation.h:853
     0x00007fff84e7db54:     movq -0x58(%rbp), %rax
     0x00007fff84e7db58:     movq %rax, -0xd0(%rbp)
     0x00007fff84e7db5f:     movl -0xa0(%rbp), %eax

[Chris Dumez]

rdar://problem/16542323

[Chris Dumez]

Created attachment 277284 [details]
Patch

[WebKit Commit Bot]

Comment on attachment 277284 [details]
Patch

Clearing flags on attachment: 277284

Committed r200062: <http://trac.webkit.org/changeset/200062>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.