fast/mediastream/RTCPeerConnection-events.html started crashing on the Chromium WebKit Lion Debug integration canary. Revision range: <http://trac.webkit.org/log/?verbose=on&rev=139698&stop_rev=139690> Flakiness Dashboard: <http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Fmediastream%2FRTCPeerConnection-events.html> Maybe this has to do with r139696 (mentions MediaStream) or r139698 (mentions blobs… does RTC use blobs?)
Added expectations in r139716.
fast/mediastream/RTCPeerConnection-statsSelector.html test crashed on SnowLeopard Debug <http://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.6%20(dbg)/builds/1984> <http://test-results.appspot.com/dashboards/flakiness_dashboard.html#tests=fast%2Fmediastream%2FRTCPeerConnection-statsSelector.html> Watching to see if this is a flake. If not, it may be related; maybe an earlier test is corrupting memory?
From looking at the history for RTC* tests on the flakiness dashboard, it looks like this might be use-after-free or some such. Linux has more informative stack traces than Mac; for example this looks typical: 14:16:05.341 19413 worker/5 fast/mediastream/RTCPeerConnection-datachannel.html crashed, (stderr lines): 14:16:05.341 19413 Received signal 11 14:16:05.341 19413 [0x7f785046b3ec] base::debug::StackTrace::StackTrace() 14:16:05.341 19413 [0x7f785046ab3b] base::debug::(anonymous namespace)::StackDumpSignalHandler() 14:16:05.341 19413 [0x7f78461e18f0] <unknown> 14:16:05.341 19413 [0x7f784cb031d2] WebCore::ContextDestructionObserver::observeContext() 14:16:05.341 19413 [0x7f784cb0310b] WebCore::ContextDestructionObserver::~ContextDestructionObserver() 14:16:05.341 19413 [0x7f784d298327] WebCore::MediaStream::~MediaStream() 14:16:05.341 19413 [0x7f784d295c32] WebCore::LocalMediaStream::~LocalMediaStream() 14:16:05.341 19413 [0x7f784d295d62] WTF::RefCounted<>::deref() 14:16:05.341 19413 [0x7f784de8ab7a] WebCore::V8LocalMediaStream::derefObject() 14:16:05.341 19413 [0x7f784d38487a] WebCore::WrapperTypeInfo::derefObject() 14:16:05.341 19413 [0x7f784d384ee8] WebCore::DOMWrapperMap<>::defaultWeakCallback() 14:16:05.341 19413 [0x7f78523577a4] v8::internal::GlobalHandles::Node::PostGarbageCollectionProcessing() 14:16:05.342 19413 [0x7f785235610d] v8::internal::GlobalHandles::PostGarbageCollectionProcessing() 14:16:05.342 19413 [0x7f7852367fba] v8::internal::Heap::PerformGarbageCollection() 14:16:05.342 19413 [0x7f785236713f] v8::internal::Heap::CollectGarbage() 14:16:05.342 19413 [0x7f78522cf557] v8::internal::Heap::CollectGarbage() 14:16:05.342 19413 [0x7f7852470cdd] v8::internal::JSReceiver::SetProperty() 14:16:05.342 19413 [0x7f785250c186] v8::internal::Runtime::SetObjectProperty() 14:16:05.342 19413 [0x7f785250c96c] v8::internal::Runtime_SetProperty() 14:16:05.342 19413 [0x22450230654e] <unknown> 14:16:05.342 19413 r8: 000000000000007c r9: 0101010101010101 r10: 0000000000000000 r11: 00007f7845ed3c7e 14:16:05.342 19413 r12: 000034f8c646ce39 r13: 00007f783f21a0b8 r14: 0000000000000004 r15: 00007fff25791628 14:16:05.342 19413 di: 00007f78347cb310 si: 0000000000000000 bp: 00007fff25790e90 bx: 00007f783f21a020 14:16:05.342 19413 dx: 00007f7850210130 ax: cdcdcdcdcdcdcdfd cx: 0000000000143890 sp: 00007fff25790e80 14:16:05.342 19413 ip: 00007f784cb031d2 efl: 0000000000010282 cgf: 5309000000000033 erf: 0000000000000000 14:16:05.342 19413 trp: 000000000000000d msk: 0000000000000000 cr2: 0000000000000000
I cannot reproduce these locally, and the flakiness dashboard indicates no recent crashes, so Occam’s razor leads me to assume this was due to solar flares disrupting the ionosphere causing epigenetic grumpiness in buildbot-inhabiting gnomes of some kind, and _they_ were responsible for the crashes. When you eliminate the probable whatever remains, however improbable, must be true.
Or, however sad it makes to say it because I have greatly appreciated your prose, it could be that I actually found and fixed the issue. Didn't know if I should close this bug or not but I should at least have wrote a comment in addition to adding a "Depends on" bug. I am blaming Disaster Area's latest stunt ship dive into a local sun.