219437 2020-12-02 09:46:03 -0800 [Debug][GStreamer] Crash in fast/mediastream/change-tracks-media-stream-being-played.html 2020-12-16 12:58:18 -0800 1 1 1 Unclassified WebKit WebRTC WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED https://bugs.webkit.org/show_bug.cgi?id=209130 InRadar P2 Normal --- 1 aboya vjaquez calvaris darin eric.carlson ews-watchlist glenn hta jer.noble philipj pnormand sergio tommyw vjaquez webkit-bug-importer youennf oldest_to_newest 1711363 0 aboya 2020-12-02 09:46:03 -0800 At the moment this crash is reproduced very easily (so far I've got it every time) in buildbox2 when using run-webkit-tests --gtk --debug I looked at this one in particular because I made a patch for the black bars/resize at the end bug that prevents the tracks from being deleted on EOS and reuses the webkit track classes by changing the pad pointer. That is the only test where I see changes: It crashes both before and after, and in the same functions (videoSampleAvailable or audioSampleAvailable), but with my patch it's a virtual pure function being called and without it's a plain SIGSEGV. Previous reports also mention a g_type_check_instance_cast segfault inside WebCore::WebKitMediaStreamTrackObserver::audioSamplesAvailable https://bugs.webkit.org/show_bug.cgi?id=209130 Having a cleaner base with no crash would be nice. Program terminated with signal SIGSEGV, Segmentation fault. #0 0x00007f36a3bf2efb in WebCore::RealtimeMediaSource::videoSampleAvailable (this=0x7f36875e4700, mediaSample=...) at ../../Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp:208 208 observer->videoSampleAvailable(mediaSample); [Current thread is 1 (Thread 0x7f3687e479c0 (LWP 126))] Thread 1 (Thread 0x7f3687e479c0 (LWP 126)): #0 0x00007f36a3bf2efb in WebCore::RealtimeMediaSource::videoSampleAvailable(WebCore::MediaSample&) (this=0x7f36875e4700, mediaSample=...) at ../../Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp:208 #1 0x00007f36a3c1ecac in WebCore::RealtimeVideoSource::videoSampleAvailable(WebCore::MediaSample&) (this=0x7f36875e4700, sample=...) at ../../Source/WebCore/platform/mediastream/RealtimeVideoSource.cpp:189 #2 0x00007f36a3bf2f14 in WebCore::RealtimeMediaSource::videoSampleAvailable(WebCore::MediaSample&) (this=0x7f3687553000, mediaSample=...) at ../../Source/WebCore/platform/mediastream/RealtimeMediaSource.cpp:208 #3 0x00007f36a3c1d901 in WebCore::RealtimeVideoCaptureSource::dispatchMediaSampleToObservers(WebCore::MediaSample&) (this=0x7f3687553000, sample=...) at ../../Source/WebCore/platform/mediastream/RealtimeVideoCaptureSource.cpp:399 #4 0x00007f36a4830192 in WebCore::MockRealtimeVideoSourceGStreamer::updateSampleBuffer() (this=0x7f3687553000) at ../../Source/WebCore/platform/mediastream/gstreamer/MockRealtimeVideoSourceGStreamer.cpp:70 #5 0x00007f36a3c4d217 in WebCore::MockRealtimeVideoSource::generateFrame() (this=0x7f3687553000) at ../../Source/WebCore/platform/mock/MockRealtimeVideoSource.cpp:449 #6 0x00007f36a3c5f051 in std::__invoke_impl<void, void (WebCore::MockRealtimeVideoSource::*&)(), WebCore::MockRealtimeVideoSource*&>(std::__invoke_memfun_deref, void (WebCore::MockRealtimeVideoSource::*&)(), WebCore::MockRealtimeVideoSource*&) (__f=@0x7f362e052ee8: (void (WebCore::MockRealtimeVideoSource::*)(WebCore::MockRealtimeVideoSource * const)) 0x7f36a3c4d024 <WebCore::MockRealtimeVideoSource::generateFrame()>, __t=@0x7f362e052ef8: 0x7f3687553000) at /usr/include/c++/10.2.0/bits/invoke.h:73 #7 0x00007f36a3c5eebf in std::__invoke<void (WebCore::MockRealtimeVideoSource::*&)(), WebCore::MockRealtimeVideoSource*&>(void (WebCore::MockRealtimeVideoSource::*&)(), WebCore::MockRealtimeVideoSource*&) (__fn=@0x7f362e052ee8: (void (WebCore::MockRealtimeVideoSource::*)(WebCore::MockRealtimeVideoSource * const)) 0x7f36a3c4d024 <WebCore::MockRealtimeVideoSource::generateFrame()>) at /usr/include/c++/10.2.0/bits/invoke.h:95 #8 0x00007f36a3c5ed4d in std::_Bind<void (WebCore::MockRealtimeVideoSource::*(WebCore::MockRealtimeVideoSource*))()>::__call<void, , 0ul>(std::tuple<>&&, std::_Index_tuple<0ul>) (this=0x7f362e052ee8, __args=...) at /usr/include/c++/10.2.0/functional:416 #9 0x00007f36a3c5ec27 in std::_Bind<void (WebCore::MockRealtimeVideoSource::*(WebCore::MockRealtimeVideoSource*))()>::operator()<, void>() (this=0x7f362e052ee8) at /usr/include/c++/10.2.0/functional:499 #10 0x00007f36a3c5eb46 in WTF::Detail::CallableWrapper<std::_Bind<void (WebCore::MockRealtimeVideoSource::*(WebCore::MockRealtimeVideoSource*))()>, void>::call() (this=0x7f362e052ee0) at DerivedSources/ForwardingHeaders/wtf/Function.h:52 #11 0x00007f369fcda633 in WTF::Function<void ()>::operator()() const (this=0x7f3687553208) at DerivedSources/ForwardingHeaders/wtf/Function.h:83 #12 0x00007f36a3c5eb86 in WTF::RunLoop::Timer<WebCore::MockRealtimeVideoSource>::fired() (this=0x7f36875531e0) at DerivedSources/ForwardingHeaders/wtf/RunLoop.h:184 #13 0x00007f36912de9c1 in operator()(gpointer) const (__closure=0x0, userData=0x7f36875531e0) at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:177 #14 0x00007f36912dea01 in _FUN(gpointer) () at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:181 #15 0x00007f36912de00d in operator()(GSource*, GSourceFunc, gpointer) const (__closure=0x0, source=0x561683020ef0, callback=0x7f36912de9e4 <_FUN(gpointer)>, userData=0x7f36875531e0) at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:53 #16 0x00007f36912de05b in _FUN(GSource*, GSourceFunc, gpointer) () at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:56 #17 0x00007f368a22004f in g_main_dispatch (context=0x561682c20af0) at ../glib/gmain.c:3325 #18 g_main_context_dispatch (context=0x561682c20af0) at ../glib/gmain.c:4016 #19 0x00007f368a2203f8 in g_main_context_iterate (context=0x561682c20af0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at ../glib/gmain.c:4092 #20 0x00007f368a220713 in g_main_loop_run (loop=0x561682ba1c10) at ../glib/gmain.c:4290 #21 0x00007f36912de624 in WTF::RunLoop::run() () at ../../Source/WTF/wtf/glib/RunLoopGLib.cpp:108 #22 0x00007f36a11a2c25 in WebKit::AuxiliaryProcessMain<WebKit::WebProcess, WebKit::WebProcessMainGtk>(int, char**) (argc=4, argv=0x7fff70c1f4d8) at ../../Source/WebKit/Shared/AuxiliaryProcessMain.h:68 #23 0x00007f36a11a2438 in WebKit::WebProcessMain(int, char**) (argc=4, argv=0x7fff70c1f4d8) at ../../Source/WebKit/WebProcess/gtk/WebProcessMainGtk.cpp:66 #24 0x0000561681c97d88 in main(int, char**) (argc=4, argv=0x7fff70c1f4d8) at ../../Source/WebKit/WebProcess/EntryPoint/unix/WebProcessMain.cpp:45 1715053 1 416320 vjaquez 2020-12-16 02:03:22 -0800 Created attachment 416320 Patch 1715205 2 416320 pnormand 2020-12-16 12:54:36 -0800 Comment on attachment 416320 Patch Nice one ;) 1715207 3 ews-feeder 2020-12-16 12:57:37 -0800 Committed r270906: <https://trac.webkit.org/changeset/270906> All reviewed patches have been landed. Closing bug and clearing flags on attachment 416320. 1715208 4 webkit-bug-importer 2020-12-16 12:58:18 -0800 <rdar://problem/72396234> 416320 2020-12-16 02:03:22 -0800 2020-12-16 12:57:38 -0800 Patch bug-219437-20201216110320.patch text/plain 5609 vjaquez U3VidmVyc2lvbiBSZXZpc2lvbjogMjcwODg0CmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggNzRiMmMxYjJiZWFkYzZi OGQ0ZDRhMDVmOWJiNWIyZTg4YzQ1Zjc5Yy4uNTA5YmQzYTQzOGE2ZmQzMjY1ZjhjOGQyYzYwOWE0 MmU2Mjk0YzZiOSAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI0IEBACisyMDIwLTEyLTE2ICBWw61j dG9yIE1hbnVlbCBKw6FxdWV6IExlYWwgIDx2amFxdWV6QGlnYWxpYS5jb20+CisKKyAgICAgICAg W0RlYnVnXVtHU3RyZWFtZXJdIENyYXNoIGluIGZhc3QvbWVkaWFzdHJlYW0vY2hhbmdlLXRyYWNr cy1tZWRpYS1zdHJlYW0tYmVpbmctcGxheWVkLmh0bWwKKyAgICAgICAgaHR0cHM6Ly9idWdzLndl YmtpdC5vcmcvc2hvd19idWcuY2dpP2lkPTIxOTQzNworCisgICAgICAgIFJldmlld2VkIGJ5IE5P 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