1601390 - Assertion failure: ms.mLiveTracks.Length() == length - 1, at /builds/worker/workspace/build/src/dom/html/HTMLMediaElement.cpp:3505

Status: RESOLVED WORKSFORME

(Core :: Audio/Video: Playback, defect, P2)

Description

[Jason Kratzer [:jkratzer]]

Attachment: testcase.html

Testcase found while fuzzing mozilla-central rev 6989fcd6bab3.

Assertion failure: ms.mLiveTracks.Length() == length - 1, at /builds/worker/workspace/build/src/dom/html/HTMLMediaElement.cpp:3505

rax = 0x0000558977d5a280   rdx = 0x0000000000000000
rcx = 0x00007f6e77ea5bb0   rbx = 0x00007f6e68ffce88
rsi = 0x00007f6e83a468b0   rdi = 0x00007f6e83a45680
rbp = 0x00007ffc9159b3c0   rsp = 0x00007ffc9159b120
r8 = 0x00007f6e83a468b0    r9 = 0x00007f6e84bae780
r10 = 0x0000000000000000   r11 = 0x0000000000000000
r12 = 0x00007ffc9159b188   r13 = 0x0000000000000000
r14 = 0x00007f6e68f7d000   r15 = 0x0000000000000000
rip = 0x00007f6e739f9113
OS|Linux|0.0.0 Linux 5.0.0-36-generic #39~18.04.1-Ubuntu SMP Tue Nov 12 11:09:50 UTC 2019 x86_64
CPU|amd64|family 6 model 94 stepping 3|8
GPU|||
Crash|SIGSEGV|0x0|0
0|0|libxul.so|mozilla::dom::HTMLMediaElement::UpdateOutputTrackSources()|hg:hg.mozilla.org/mozilla-central:dom/html/HTMLMediaElement.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|3505|0x0
0|1|libxul.so|mozilla::WatchManager<mozilla::dom::HTMLMediaElement>::PerCallbackWatcher::Notify()::{lambda()#1}::operator()() const|||0x77
0|2|libxul.so|mozilla::detail::RunnableFunction<mozilla::WatchManager<mozilla::dom::HTMLMediaElement>::PerCallbackWatcher::Notify()::{lambda()#1}>::Run()|hg:hg.mozilla.org/mozilla-central:xpcom/threads/nsThreadUtils.h:6989fcd6bab30c909411fbec04a4f29a78024ddd|564|0x5
0|3|libxul.so|mozilla::AutoTaskDispatcher::DrainDirectTasks()|hg:hg.mozilla.org/mozilla-central:xpcom/threads/TaskDispatcher.h:6989fcd6bab30c909411fbec04a4f29a78024ddd|99|0x11
0|4|libxul.so|mozilla::EventTargetWrapper::FireTailDispatcher()|hg:hg.mozilla.org/mozilla-central:xpcom/threads/AbstractThread.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|71|0x15
0|5|libxul.so|mozilla::detail::RunnableMethodImpl<mozilla::EventTargetWrapper*, void (mozilla::EventTargetWrapper::*)(), true, (mozilla::RunnableKind)0>::Run()|hg:hg.mozilla.org/mozilla-central:xpcom/threads/nsThreadUtils.h:6989fcd6bab30c909411fbec04a4f29a78024ddd|1176|0x12
0|6|libxul.so|mozilla::CycleCollectedJSContext::ProcessStableStateQueue()|hg:hg.mozilla.org/mozilla-central:xpcom/base/CycleCollectedJSContext.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|399|0x11
0|7|libxul.so|mozilla::CycleCollectedJSContext::AfterProcessTask(unsigned int)|hg:hg.mozilla.org/mozilla-central:xpcom/base/CycleCollectedJSContext.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|458|0x8
0|8|libxul.so|XPCJSContext::AfterProcessTask(unsigned int)|hg:hg.mozilla.org/mozilla-central:js/xpconnect/src/XPCJSContext.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|1329|0xb
0|9|libxul.so|nsThread::ProcessNextEvent(bool, bool*)|hg:hg.mozilla.org/mozilla-central:xpcom/threads/nsThread.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|1313|0xc
0|10|libxul.so|NS_ProcessNextEvent(nsIThread*, bool)|hg:hg.mozilla.org/mozilla-central:xpcom/threads/nsThreadUtils.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|486|0x11
0|11|libxul.so|mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*)|hg:hg.mozilla.org/mozilla-central:ipc/glue/MessagePump.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|88|0xa
0|12|libxul.so|MessageLoop::RunInternal()|hg:hg.mozilla.org/mozilla-central:ipc/chromium/src/base/message_loop.cc:6989fcd6bab30c909411fbec04a4f29a78024ddd|315|0x17
0|13|libxul.so|MessageLoop::Run()|hg:hg.mozilla.org/mozilla-central:ipc/chromium/src/base/message_loop.cc:6989fcd6bab30c909411fbec04a4f29a78024ddd|290|0x8
0|14|libxul.so|nsBaseAppShell::Run()|hg:hg.mozilla.org/mozilla-central:widget/nsBaseAppShell.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|137|0xd
0|15|libxul.so|XRE_RunAppShell()|hg:hg.mozilla.org/mozilla-central:toolkit/xre/nsEmbedFunctions.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|932|0x11
0|16|libxul.so|mozilla::ipc::MessagePumpForChildProcess::Run(base::MessagePump::Delegate*)|hg:hg.mozilla.org/mozilla-central:ipc/glue/MessagePump.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|238|0x5
0|17|libxul.so|MessageLoop::RunInternal()|hg:hg.mozilla.org/mozilla-central:ipc/chromium/src/base/message_loop.cc:6989fcd6bab30c909411fbec04a4f29a78024ddd|315|0x17
0|18|libxul.so|MessageLoop::Run()|hg:hg.mozilla.org/mozilla-central:ipc/chromium/src/base/message_loop.cc:6989fcd6bab30c909411fbec04a4f29a78024ddd|290|0x8
0|19|libxul.so|XRE_InitChildProcess(int, char**, XREChildData const*)|hg:hg.mozilla.org/mozilla-central:toolkit/xre/nsEmbedFunctions.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|767|0x8
0|20|firefox-bin|content_process_main(mozilla::Bootstrap*, int, char**)|hg:hg.mozilla.org/mozilla-central:ipc/contentproc/plugin-container.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|56|0x14
0|21|firefox-bin|main|hg:hg.mozilla.org/mozilla-central:browser/app/nsBrowserApp.cpp:6989fcd6bab30c909411fbec04a4f29a78024ddd|272|0x12
0|22|libc-2.27.so||||0x21b97
0|23|firefox-bin|MOZ_ReportCrash|hg:hg.mozilla.org/mozilla-central:mfbt/Assertions.h:6989fcd6bab30c909411fbec04a4f29a78024ddd|203|0x5

Comment 1

[Jason Kratzer [:jkratzer]]

Attachment: 42d7b139fd9e05c2457100231f86a57609cba2df.webm

Comment 2

[Tyson Smith [:tsmith]]

The attached test case no longer reproduces the issue. This issue was last reported by fuzzers running m-c report 20200428-5797e768d878.