This bug was filed from the Socorro interface and is report bp-18dc498f-7958-4ca1-9480-cf2670180803. ============================================================= Top 10 frames of crashing thread: 0 libxul.so mozilla::TransceiverImpl::UpdateVideoConduit media/webrtc/signaling/src/peerconnection/TransceiverImpl.cpp:935 1 libxul.so mozilla::TransceiverImpl::UpdateConduit media/webrtc/signaling/src/peerconnection/TransceiverImpl.cpp:249 2 libxul.so mozilla::PeerConnectionMedia::UpdateMediaPipelines media/webrtc/signaling/src/peerconnection/PeerConnectionMedia.cpp:491 3 libxul.so mozilla::PeerConnectionImpl::SetSignalingState_m media/webrtc/signaling/src/peerconnection/PeerConnectionImpl.cpp:2849 4 libxul.so mozilla::PeerConnectionImpl::SetRemoteDescription media/webrtc/signaling/src/peerconnection/PeerConnectionImpl.cpp:1935 5 libxul.so mozilla::dom::PeerConnectionImplBinding::setRemoteDescription media/webrtc/signaling/src/peerconnection/PeerConnectionImpl.h:368 6 libxul.so bool mozilla::dom::binding_detail::GenericMethod<mozilla::dom::binding_detail::NormalThisPolicy, mozilla::dom::binding_detail::ThrowExceptions> dom/bindings/BindingUtils.cpp:3285 7 libxul.so js::InternalCallOrConstruct 8 libxul.so Interpret 9 libxul.so js::RunScript ============================================================= I filed this after it has been reported to me by Hendrik who is on the CC list. Hendrik, can you please add some details in how to reproduce the bug?

It's a null pointer crash. So `conduit` should be null in this line: https://hg.mozilla.org/releases/mozilla-beta/annotate/dd92dec96711e60a8c6a49ebe584fa23a453a292/media/webrtc/signaling/src/peerconnection/TransceiverImpl.cpp#l935

I am not so sure about that. We dereference (and modify!) conduit before getting to that line, and conduit is a local variable. Also, the function we're calling on conduit (ConfigureSendMediaCodec) is a virtual function; that almost always results in a close-to-null-but-not-quite crash (eg; 0x4 or 0x8). I think something different is going on here, and it would be really nice to have some steps to reproduce.