Bug 132063

Summary:	fast/files/workers/worker-read-blob-sync.html sometimes asserts in AbstractValue::checkConsistency()
Product:	WebKit	Reporter:	Alexey Proskuryakov <ap>
Component:	JavaScriptCore	Assignee:	Nobody <webkit-unassigned>
Status:	RESOLVED CONFIGURATION CHANGED
Severity:	Normal	CC:	fpizlo
Priority:	P2	Keywords:	InRadar
Version:	528+ (Nightly build)
Hardware:	Unspecified
OS:	Unspecified

Description Alexey Proskuryakov 2014-04-23 09:54:44 PDT

fast/files/workers/worker-read-blob-sync.html sometimes (rarely) crashes like this. First crash still remembered by flakiness dashboard on April 8, latest one yesterday night (after the fix in <https://webkit.org/b/132032>).

http://build.webkit.org/results/Apple%20Mavericks%20Debug%20WK1%20(Tests)/r167699%20(4861)/fast/files/workers/worker-read-blob-sync-crash-log.txt

Thread 15 Crashed:: JSC Compilation Thread
0   com.apple.JavaScriptCore      	0x000000010a3f60aa WTFCrash + 42 (Assertions.cpp:333)
1   com.apple.JavaScriptCore      	0x0000000109de8dc2 JSC::DFG::AbstractValue::checkConsistency() const + 482 (DFGAbstractValue.cpp:284)
2   com.apple.JavaScriptCore      	0x0000000109de8b0d JSC::DFG::AbstractValue::setMostSpecific(JSC::DFG::Graph&, JSC::JSValue) + 253 (DFGAbstractValue.cpp:53)
3   com.apple.JavaScriptCore      	0x0000000109eb2e76 JSC::DFG::Graph::Graph(JSC::VM&, JSC::DFG::Plan&, JSC::DFG::LongLivedState&) + 966 (DFGGraph.cpp:75)
4   com.apple.JavaScriptCore      	0x0000000109f3dc65 JSC::DFG::Plan::compileInThreadImpl(JSC::DFG::LongLivedState&) + 181 (DFGPlan.cpp:192)
5   com.apple.JavaScriptCore      	0x0000000109f3d8e4 JSC::DFG::Plan::compileInThread(JSC::DFG::LongLivedState&, JSC::DFG::ThreadData*) + 292 (DFGPlan.cpp:155)
6   com.apple.JavaScriptCore      	0x0000000109fe0760 JSC::DFG::Worklist::runThread(JSC::DFG::ThreadData*) + 528 (DFGWorklist.cpp:302)
7   com.apple.JavaScriptCore      	0x0000000109fdf374 JSC::DFG::Worklist::threadFunction(void*) + 36 (DFGWorklist.cpp:326)
8   com.apple.JavaScriptCore      	0x000000010a4482a0 WTF::threadEntryPoint(void*) + 144 (Threading.cpp:68)
9   com.apple.JavaScriptCore      	0x000000010a448f88 WTF::wtfThreadEntryPoint(void*) + 296 (ThreadingPthreads.cpp:168)
10  libsystem_pthread.dylib       	0x00007fff959f1899 _pthread_body + 138
11  libsystem_pthread.dylib       	0x00007fff959f172a _pthread_start + 137
12  libsystem_pthread.dylib       	0x00007fff959f5fc9 thread_start + 13

Comment 1 Alexey Proskuryakov 2014-04-23 09:55:35 PDT

<rdar://problem/16700180>

Comment 2 Alexey Proskuryakov 2021-05-13 16:48:32 PDT

I don't see any recent assertions on this test.