[Webkit-unassigned] [Bug 180045] New: Flaky crash in WebCore::DOMGuardedObject::clear() during service worker tests

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=180045

            Bug ID: 180045
           Summary: Flaky crash in WebCore::DOMGuardedObject::clear()
                    during service worker tests
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cdumez at apple.com
                CC: beidson at apple.com, ggaren at apple.com,
                    mark.lam at apple.com, ryanhaddad at apple.com,
                    youennf at gmail.com

Flaky crash in WebCore::DOMGuardedObject::clear() during service worker tests:
Thread 7 Crashed:: WebCore: Worker
0   com.apple.JavaScriptCore            0x0000000121066234 WTFCrash + 36 (Assertions.cpp:270)
1   com.apple.WebCore                   0x0000000113600c18 WebCore::DOMGuardedObject::clear() + 104 (JSDOMGuardedObject.cpp:50)
2   com.apple.WebCore                   0x0000000113600d78 WebCore::DOMGuardedObject::contextDestroyed() + 40 (JSDOMGuardedObject.cpp:62)
3   com.apple.WebCore                   0x0000000113bf6008 WebCore::ScriptExecutionContext::~ScriptExecutionContext() + 184 (ScriptExecutionContext.cpp:124)
4   com.apple.WebCore                   0x0000000114f04081 WebCore::WorkerGlobalScope::~WorkerGlobalScope() + 977 (WorkerGlobalScope.cpp:96)
5   com.apple.WebCore                   0x0000000114f50662 WebCore::ServiceWorkerGlobalScope::~ServiceWorkerGlobalScope() + 98 (ServiceWorkerGlobalScope.cpp:43)
6   com.apple.WebCore                   0x0000000114f50685 WebCore::ServiceWorkerGlobalScope::~ServiceWorkerGlobalScope() + 21 (ServiceWorkerGlobalScope.cpp:43)
7   com.apple.WebCore                   0x0000000114f506c9 WebCore::ServiceWorkerGlobalScope::~ServiceWorkerGlobalScope() + 25 (ServiceWorkerGlobalScope.cpp:43)
8   com.apple.WebCore                   0x0000000112582081 WTF::RefCounted<WebCore::WorkerGlobalScope>::deref() const + 81 (RefCounted.h:145)
9   com.apple.WebCore                   0x0000000113035347 void WTF::derefIfNotNull<WebCore::WorkerGlobalScope>(WebCore::WorkerGlobalScope*) + 55 (RefPtr.h:46)
10  com.apple.WebCore                   0x0000000113510d8b WTF::RefPtr<WebCore::WorkerGlobalScope>::operator=(std::nullptr_t) + 91 (RefPtr.h:152)
11  com.apple.WebCore                   0x0000000114f1f475 WebCore::WorkerThread::workerThread() + 1989 (WorkerThread.cpp:232)
12  com.apple.WebCore                   0x0000000114f25e28 WebCore::WorkerThread::start(WTF::Function<void (WTF::String const&)>&&)::$_12::operator()() const + 24 (WorkerThread.cpp:145)
13  com.apple.WebCore                   0x0000000114f25de9 WTF::Function<void ()>::CallableWrapper<WebCore::WorkerThread::start(WTF::Function<void (WTF::String const&)>&&)::$_12>::call() + 25 (Function.h:101)
14  com.apple.JavaScriptCore            0x00000001210a17ab WTF::Function<void ()>::operator()() const + 139 (Function.h:56)
15  com.apple.JavaScriptCore            0x00000001210ef6ef WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) + 351 (Threading.cpp:129)
16  com.apple.JavaScriptCore            0x00000001210f4db5 WTF::wtfThreadEntryPoint(void*) + 21 (ThreadingPthreads.cpp:223)
17  libsystem_pthread.dylib             0x00007fff8dd8699d _pthread_body + 131
18  libsystem_pthread.dylib             0x00007fff8dd8691a _pthread_start + 168
19  libsystem_pthread.dylib             0x00007fff8dd84351 thread_start + 13

See https://build.webkit.org/results/Apple%20El%20Capitan%20Debug%20WK2%20(Tests)/r225150%20(4315)/com.apple.WebKit.WebContent.Development-27977-crash-log.txt

The symptom is that a lot of SW tests time out during a layout test run because the SW context process has crashed.

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