200545 2019-08-08 13:09:22 -0700 ScrollingStateNode is not ThreadSafeRefCounted but is ref'd / deref'd from several threads 2019-08-08 15:11:19 -0700 1 1 1 Unclassified WebKit WebCore Misc. WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 200507 1 cdumez cdumez achristensen cmarcelo commit-queue ews-watchlist fred.wang ggaren jamesr koivisto luiz simon.fraser tonikitoo webkit-bug-importer oldest_to_newest 1559639 0 cdumez 2019-08-08 13:09:22 -0700 ScrollingStateNode is not ThreadSafeRefCounted but is ref'd / deref'd from several threads: Thread 8 Crashed:: WebCore: Scrolling 0 com.apple.WebCore 0x0000000101a45093 WTFCrashWithInfo(int, char const*, char const*, int) + 19 1 com.apple.WebCore 0x0000000102cfddce WTF::RefCounted<WebCore::ScrollingStateNode>::deref() const + 126 2 com.apple.WebCore 0x0000000102d00188 WebCore::ScrollingStateTree::~ScrollingStateTree() + 40 3 com.apple.WebCore 0x0000000102d07b80 WebCore::ThreadedScrollingTree::commitTreeState(std::__1::unique_ptr<WebCore::ScrollingStateTree, std::__1::default_delete<WebCore::ScrollingStateTree> >) + 64 4 com.apple.WebCore 0x0000000101c467e7 WTF::Detail::CallableWrapper<WebCore::ScrollingCoordinatorMac::commitTreeState()::$_5, void>::call() + 39 5 com.apple.WebCore 0x0000000102d01d79 WebCore::ScrollingThread::dispatchFunctionsFromScrollingThread() + 121 6 com.apple.WebCore 0x0000000101c4584a WebCore::ScrollingThread::threadRunLoopSourceCallback(void*) + 26 7 com.apple.CoreFoundation 0x00007fff3e2f8581 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17 8 com.apple.CoreFoundation 0x00007fff3e3b08ac __CFRunLoopDoSource0 + 108 9 com.apple.CoreFoundation 0x00007fff3e2db530 __CFRunLoopDoSources0 + 208 10 com.apple.CoreFoundation 0x00007fff3e2da9ad __CFRunLoopRun + 1293 11 com.apple.CoreFoundation 0x00007fff3e2da207 CFRunLoopRunSpecific + 487 12 com.apple.CoreFoundation 0x00007fff3e3186b3 CFRunLoopRun + 99 13 com.apple.WebCore 0x0000000101c457dd WebCore::ScrollingThread::initializeRunLoop() + 253 14 com.apple.JavaScriptCore 0x000000010623e694 WTF::Thread::entryPoint(WTF::Thread::NewThreadContext*) + 212 15 com.apple.JavaScriptCore 0x0000000106240959 WTF::wtfThreadEntryPoint(void*) + 9 16 libsystem_pthread.dylib 0x00007fff665b2661 _pthread_body + 340 17 libsystem_pthread.dylib 0x00007fff665b250d _pthread_start + 377 18 libsystem_pthread.dylib 0x00007fff665b1bf9 thread_start + 13 1559646 1 375836 cdumez 2019-08-08 13:40:34 -0700 Created attachment 375836 Patch 1559651 2 375836 koivisto 2019-08-08 13:59:32 -0700 Comment on attachment 375836 Patch In which thread is it supposed to be deleted? 1559652 3 simon.fraser 2019-08-08 14:01:13 -0700 Chris and I talked about this. We have an explicit hand-off of the state tree in ScrollingCoordinatorMac::commitTreeState() which may be tripping his assertions. 1559653 4 375837 cdumez 2019-08-08 14:02:31 -0700 Created attachment 375837 Patch 1559655 5 cdumez 2019-08-08 14:05:25 -0700 (In reply to Simon Fraser (smfr) from comment #3) > Chris and I talked about this. We have an explicit hand-off of the state > tree in ScrollingCoordinatorMac::commitTreeState() which may be tripping his > assertions. (In reply to Antti Koivisto from comment #2) > Comment on attachment 375836 [details] > Patch > > In which thread is it supposed to be deleted? I am not familiar enough with this part of the code to be sure, but looking at the ScrollingStateNode data members, I do not see anything obviously unsafe if constructing them on the main thread and then destroying them on the scrolling thread. 1559660 6 375838 cdumez 2019-08-08 14:27:32 -0700 Created attachment 375838 Patch 1559677 7 375838 commit-queue 2019-08-08 15:10:42 -0700 Comment on attachment 375838 Patch Clearing flags on attachment: 375838 Committed r248445: <https://trac.webkit.org/changeset/248445> 1559678 8 commit-queue 2019-08-08 15:10:44 -0700 All reviewed patches have been landed. Closing bug. 1559679 9 webkit-bug-importer 2019-08-08 15:11:19 -0700 <rdar://problem/54098566> 375836 2019-08-08 13:40:34 -0700 2019-08-08 14:02:30 -0700 Patch bug-200545-20190808134033.patch text/plain 1684 cdumez U3VidmVyc2lvbiBSZXZpc2lvbjogMjQ4NDQwCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggZTQ3NWY5NTRmYTk1NzBm ODk3YjRiNGZhMTcyMjE3YTJiZGIyM2Y0Yi4uMDc2NDNhOGMxOTdhY2U5YWQ1NDUwN2Q3MGEyNmE4 YzM1NjlhOTgxYSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDE3IEBACisyMDE5LTA4LTA4ICBDaHJp cyBEdW1leiAgPGNkdW1lekBhcHBsZS5jb20+CisKKyAgICAgICAgU2Nyb2xsaW5nU3RhdGVOb2Rl IGlzIG5vdCBUaHJlYWRTYWZlUmVmQ291bnRlZCBidXQgaXMgcmVmJ2QgLyBkZXJlZidkIGZyb20g c2V2ZXJhbCB0aHJlYWRzCisgICAgICAgIGh0dHBzOi8vYnVncy53ZWJraXQub3JnL3Nob3dfYnVn LmNnaT9pZD0yMDA1NDUKKworICAgICAgICBSZXZpZXdlZCBieSBOT0JPRFkgKE9PUFMhKS4KKwor ICAgICAgICBUaGUgU2Nyb2xsaW5nU3RhdGVUcmVlIGFuZCBpdHMgU2Nyb2xsaW5nU3RhdGVOb2Rl 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