This bug was filed from the Socorro interface and is report bp-a1dea194-7992-4c21-acad-27e282121230 . ============================================================= Steps: 1. Go to http://mozilla.github.com/webrtc-landing/pc_test.html 2. Select Start 3. Wait for hip hip horray 4. Quit Firefox Expected: Firefox should shutdown without a crash. Actual: A crash occurs during shutdown. Reproducible too on Win 7.

0 xul.dll nsTimerEvent::`scalar deleting destructor' 1 xul.dll nsRunnable::Release obj-firefox/xpcom/build/nsThreadUtils.cpp:31 2 xul.dll nsThread::ProcessNextEvent xpcom/threads/nsThread.cpp:633 3 xul.dll nsThread::ThreadFunc xpcom/threads/nsThread.cpp:265 4 nspr4.dll _PR_NativeRunThread nsprpub/pr/src/threads/combined/pruthr.c:395 5 nspr4.dll pr_root nsprpub/pr/src/md/windows/w95thred.c:90 6 msvcr100.dll _callthreadstartex f:\dd\vctools\crt_bld\self_x86\crt\src\threadex.c:314 7 msvcr100.dll _threadstartex f:\dd\vctools\crt_bld\self_x86\crt\src\threadex.c:292 8 kernel32.dll BaseThreadInitThunk 9 ntdll.dll __RtlUserThreadStart 10 ntdll.dll _RtlUserThreadStart

I note that this test scenario does not crash under OS X, but does reliably lead to a hang on shutdown. The attached backtrace shows the stacks for all process threads after such a hang has occurred. This may or may not be the same bug. In the context of this error report, thread 41 seems particularly suspect.

This is ridiculously difficult to debug right now due to Bug 826115, which brings my whole machine to its knees when running a debug Windows build. I'm still trying, but this is taking much longer than it should...

Lets try making the one-liner patch suggested there to speed testing it

Yeah, I was trying to chase down where this was introduced. The check-in is change set 1a2e77002690 from Monday Dec 31, but I can't track that back to a bug. I'll just make the change locally.

I think this is a dupe of bug 799142 after doing some stack comparison.