174522 2017-07-14 12:31:55 -0700 Possible crash in ~UserGestureIndicator() when on non-main thread 2017-07-17 12:53:00 -0700 1 1 1 Unclassified WebKit WebCore Misc. WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 174592 1 cdumez cdumez beidson buildbot dbates esprehn+autocc kangil.han sam webkit-bug-importer oldest_to_newest 1328941 0 cdumez 2017-07-14 12:31:55 -0700 Possible crash in ~UserGestureIndicator() when on non-main thread: Thread 27 Crashed:: WebCore: Worker 0 com.apple.WebCore 0x00007fffaef36330 WebCore::UserGestureIndicator::~UserGestureIndicator() + 176 1 com.apple.WebCore 0x00007fffadeb9b70 WebCore::DOMTimer::fired() + 1008 2 com.apple.WebCore 0x00007fffadde13e0 WebCore::ThreadTimers::sharedTimerFiredInternal() + 176 3 com.apple.WebCore 0x00007fffaefead6d WebCore::WorkerRunLoop::runInMode(WebCore::WorkerGlobalScope*, WebCore::ModePredicate const&, WebCore::WorkerRunLoop::WaitMode) + 365 4 com.apple.WebCore 0x00007fffaefeaba0 WebCore::WorkerRunLoop::run(WebCore::WorkerGlobalScope*) + 96 5 com.apple.WebCore 0x00007fffaefee421 WebCore::WorkerThread::workerThread() + 929 6 com.apple.JavaScriptCore 0x00007fffa8db1c62 WTF::threadEntryPoint(void*) + 178 7 com.apple.JavaScriptCore 0x00007fffa8db1b8f WTF::wtfThreadEntryPoint(void*) + 15 8 libsystem_pthread.dylib 0x00007fffbc8e2aab _pthread_body + 180 9 libsystem_pthread.dylib 0x00007fffbc8e29f7 _pthread_start + 286 10 libsystem_pthread.dylib 0x00007fffbc8e21fd thread_start + 13 1328942 1 cdumez 2017-07-14 12:32:19 -0700 <rdar://problem/30283071> 1328946 2 315472 cdumez 2017-07-14 12:38:44 -0700 Created attachment 315472 Patch 1328966 3 315472 beidson 2017-07-14 13:22:15 -0700 Comment on attachment 315472 Patch This seems like we could actually write a test for it? 1328977 4 cdumez 2017-07-14 13:39:50 -0700 (In reply to Brady Eidson from comment #3) > Comment on attachment 315472 [details] > Patch > > This seems like we could actually write a test for it? I will try but it seems pretty racy. 1328992 5 cdumez 2017-07-14 13:53:22 -0700 (In reply to Chris Dumez from comment #4) > (In reply to Brady Eidson from comment #3) > > Comment on attachment 315472 [details] > > Patch > > > > This seems like we could actually write a test for it? > > I will try but it seems pretty racy. I *think* a user gesture needs to happen on the main thread and *while* this user gesture is happening (i.e. there is still a UserGestureIndicator object alive for the gesture), a DOMTimer needs to fire in a worker thread. 1328997 6 315472 sam 2017-07-14 14:05:18 -0700 Comment on attachment 315472 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=315472&action=review > Source/WebCore/dom/UserGestureIndicator.cpp:71 > + // It is only safe to use currentToken() on the main thread. > + m_previousToken = currentToken(); Seems like you should ASSERT(isMainThread()) in currentToken(). 1328998 7 cdumez 2017-07-14 14:06:15 -0700 (In reply to Sam Weinig from comment #6) > Comment on attachment 315472 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=315472&action=review > > > Source/WebCore/dom/UserGestureIndicator.cpp:71 > > + // It is only safe to use currentToken() on the main thread. > > + m_previousToken = currentToken(); > > Seems like you should ASSERT(isMainThread()) in currentToken(). Thanks, I'll add the ASSERT and am trying to write a test right now. 1328999 8 315472 sam 2017-07-14 14:07:56 -0700 Comment on attachment 315472 Patch r=me with the ASSERT. 1329025 9 315491 cdumez 2017-07-14 14:48:03 -0700 Created attachment 315491 Patch 1329038 10 315491 cdumez 2017-07-14 15:17:43 -0700 Comment on attachment 315491 Patch Will wait for debug EWS before landing. 1329054 11 315491 cdumez 2017-07-14 16:02:57 -0700 Comment on attachment 315491 Patch Clearing flags on attachment: 315491 Committed r219531: <http://trac.webkit.org/changeset/219531> 1329055 12 cdumez 2017-07-14 16:02:58 -0700 All reviewed patches have been landed. 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