ASSERTION FAILED: m_heap->vm()->currentThreadIsHoldingAPILock() in inspector-protocol/*

• Component: Web Inspector
• Status: RESOLVED FIXED

[Alexey Proskuryakov]

http://build.webkit.org/results/Apple%20Mavericks%20Debug%20WK2%20(Tests)/r164696%20(2899)/inspector-protocol/page/deny-X-FrameOption-crash-log.txt

ASSERTION FAILED: m_heap->vm()->currentThreadIsHoldingAPILock()
/Volumes/Data/slave/mavericks-debug/build/Source/JavaScriptCore/heap/MarkedAllocator.cpp(149) : void *JSC::MarkedAllocator::allocateSlowCase(size_t)
1   0x1106508d0 WTFCrash
2   0x110474955 JSC::MarkedAllocator::allocateSlowCase(unsigned long)
3   0x11189f7af JSC::MarkedAllocator::allocate(unsigned long)
4   0x11189f649 JSC::MarkedSpace::allocateWithImmortalStructureDestructor(unsigned long)
5   0x11189f5b6 JSC::Heap::allocateWithImmortalStructureDestructor(unsigned long)
6   0x11189f487 void* JSC::allocateCell<JSC::Structure>(JSC::Heap&, unsigned long)
7   0x11189f05f void* JSC::allocateCell<JSC::Structure>(JSC::Heap&)
8   0x11189eddf JSC::Structure::create(JSC::VM&, JSC::JSGlobalObject*, JSC::JSValue, JSC::TypeInfo const&, JSC::ClassInfo const*, unsigned char, unsigned int)
9   0x1124cc810 WebCore::JSCommandLineAPIHostPrototype::createStructure(JSC::VM&, JSC::JSGlobalObject*, JSC::JSValue)
10  0x1124cb769 WebCore::JSCommandLineAPIHost::createPrototype(JSC::VM&, JSC::JSGlobalObject*)
...

[Radar WebKit Bug Importer]

<rdar://problem/16170264>

[Alexey Proskuryakov]

Actually, there are lots of inspector tests failing with this assertion, probably should file a bug about each one.

Also:

inspector-protocol/debugger/nested-inspectors.html
inspector-protocol/dom-debugger/node-removed.html

[Mark Lam]

(In reply to comment #2)
> Actually, there are lots of inspector tests failing with this assertion, probably should file a bug about each one.
> 
> Also:
> 
> inspector-protocol/debugger/nested-inspectors.html
> inspector-protocol/dom-debugger/node-removed.html

They are probably due to the same root cause though.  I'm investigating.

[Mark Lam]

*** Bug 129360 has been marked as a duplicate of this bug. ***

[Mark Lam]

The test failure is intermittent because it depends on an GC / allocation activity happening at exactly the right moment.  That is why I don't see the failures when I run it on my machine.  However, there is an easy way to get an equivalent reproduction case i.e. by adding the following assertion to JSC::Structure::create():

    ASSERT(vm.currentThreadIsHoldingAPILock());

With that I can get the inspector-protocol tests to fail all the time.

The failure is because InjectedScriptModule::ensureInjected() isn't using an APIEntryShim before it started calling functions that enter the VM.  The fix is to use the shim here.  Patch coming soon.

[Mark Lam]

Created attachment 225235 [details]
the patch.

[Mark Lam]

Created attachment 225237 [details]
patch 2: added a comment.

[WebKit Commit Bot]

Comment on attachment 225237 [details]
patch 2: added a comment.

Clearing flags on attachment: 225237

Committed r164717: <http://trac.webkit.org/changeset/164717>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.