It looks like MessageChannel::WillDestroyMessageLoop()  is calling AnnotateCrashReport() off-mainthread, which asserts. Bill, i see you in the blame for WillDestroyCurrentMessageLoop()? > 05:13:22 INFO - Crash reason: EXCEPTION_BREAKPOINT > 05:13:22 INFO - Crash address: 0x60f83eb7 > 05:13:22 INFO - Assertion: Unknown assertion type 0x00000000 > 05:13:22 INFO - Process uptime: 11 seconds > 05:13:22 INFO - Thread 4 (crashed) > 05:13:22 INFO - 0 xul.dll!CrashReporter::AnnotateCrashReport(nsACString const &,nsACString const &) [nsExceptionHandler.cpp:ccdbdd6e79e3 : 2355 + 0x18] > 05:13:22 INFO - eip = 0x60f83eb7 esp = 0x03a3f974 ebp = 0x03a3fa54 ebx = 0x03a3fa68 > 05:13:22 INFO - esi = 0x00000933 edi = 0x03a3fa74 eax = 0x00000000 ecx = 0x6cf906ef > 05:13:22 INFO - edx = 0x00000060 efl = 0x00000216 > 05:13:22 INFO - Found by: given as instruction pointer in context > 05:13:22 INFO - 1 xul.dll!mozilla::ipc::MessageChannel::WillDestroyCurrentMessageLoop() [MessageChannel.cpp:ccdbdd6e79e3 : 680 + 0x2a] > 05:13:22 INFO - eip = 0x5eba81d6 esp = 0x03a3fa5c ebp = 0x03a3fa80 > 05:13:22 INFO - Found by: call frame info ... > Assertion failure: NS_IsMainThread(), at c:/builds/moz2_slave/m-in-w32-d-0000000000000000000/build/src/toolkit/crashreporter/nsExceptionHandler.cpp:2355 1: https://hg.mozilla.org/mozilla-central/annotate/abdcc8dfc28397b95338245390e12c56658ad182/ipc/glue/MessageChannel.cpp#l676
Component: Telemetry → IPC
Product: Toolkit → Core
I filed bug 1360697 for the media issue here. The assertion is easy to fix.
Created attachment 8863041 [details] [diff] [review] patch See https://bugzilla.mozilla.org/show_bug.cgi?id=1338310#c3. I guess I was wrong that this would never happen.
Assignee: nobody → wmccloskey
Comment on attachment 8863041 [details] [diff] [review] patch Talked about this in person but, I think this is expected since the GPU process shuts down the crash reporter shmem before all actors have necessarily closed down.
Status: NEW → RESOLVED
Last Resolved: a year ago
Resolution: --- → INCOMPLETE
Status: RESOLVED → REOPENED
Resolution: INCOMPLETE → ---
1 failures in 2978 pushes (0.0 failures/push) were associated with this bug in the last 7 days. Repository breakdown: * autoland: 1 Platform breakdown: * windows7-32: 1 For more details, see: https://treeherder.mozilla.org/intermittent-failures.html#/bugdetails?bug=1359170&startday=2018-10-29&endday=2018-11-04&tree=all
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