[Tracking Requested - why for this release]: [Tracking Requested - why for this release]: This bug was filed from the Socorro interface and is report bp-29444cd6-654b-4bd6-b771-472152150716. ============================================================= Top Frames: 0 xul.dll gfxWindowsPlatform::InitD3D11Devices() gfx/thebes/gfxWindowsPlatform.cpp 1 xul.dll gfxWindowsPlatform::gfxWindowsPlatform() gfx/thebes/gfxWindowsPlatform.cpp 2 xul.dll gfxPlatform::Init() gfx/thebes/gfxPlatform.cpp 3 xul.dll mozilla::layers::CompositorChild::Create(IPC::Channel*, unsigned long) gfx/layers/ipc/CompositorChild.cpp 4 xul.dll mozilla::dom::ContentChild::AllocPCompositorChild(IPC::Channel*, unsigned long) dom/ipc/ContentChild.cpp 5 xul.dll mozilla::dom::PContentChild::OnMessageReceived(IPC::Message const&) obj-firefox/ipc/ipdl/PContentChild.cpp 6 xul.dll mozilla::ipc::MessageChannel::DispatchMessageW(IPC::Message const&) ipc/glue/MessageChannel.cpp 7 xul.dll mozilla::ipc::MessageChannel::OnMaybeDequeueOne() ipc/glue/MessageChannel.cpp 8 xul.dll MessageLoop::DoWork() ipc/chromium/src/base/message_loop.cc 9 xul.dll mozilla::ipc::MessagePumpForChildProcess::Run(base::MessagePump::Delegate*) ipc/glue/MessagePump.cpp [...] This is hugely spiking in Nightly and Dev Edition builds of 2015-07-15, so it looks like it's something that landed on both channels on the 14th. All those crashes seem to have a 0x0 address and almost all are on startup and on Windows 7.

On m-aurora, it looks like bug 1159751 is the one gfx patch that landed in the offending timeframe and it matches the #1 frame. Bas, do we need to back out?

Yes. This was bug 1159751. I can fix it.

Bug 1159751 has been backed out per IRC discussion with Jeff and Windows nightlies are being respun.

Thanks for backing this out so quickly.

This was mentioned as a top crash in today's channel meeting.

I believe this is also showing up in the form of busted Marionette tests on a particular Windows 7 builder that belongs to Platform Quality: https://treeherder.mozilla.org/#/jobs?repo=mozilla-central&revision=72835344333f&filter-job_group_symbol=VP&filter-platform=Windows%207 Here's a crash report sent from that builder: https://crash-stats.mozilla.com/report/index/6b83bf98-37ee-4291-923c-0ad8b2150715

Last reports of this crash were with builds from 2015071603. VERIFIED per crash stats.