This bug is for crash report bp-c4cafe1f-cd8e-414e-8ca2-dc2530200310.

Top 10 frames of crashing thread:

0 libpthread-2.31.so __pthread_cond_wait /usr/src/debug/glibc-2.31/nptl/pthread_cond_wait.c:638
1 firefox-bin <name omitted> mozglue/misc/ConditionVariable_posix.cpp:109
2 libxul.so mozilla::ThreadEventQueue<mozilla::PrioritizedEventQueue>::GetEvent xpcom/threads/CondVar.h:57
3 libxul.so nsThread::ProcessNextEvent xpcom/threads/nsThread.cpp:1141
4 libxul.so <name omitted> xpcom/threads/nsThreadUtils.cpp:481
5 libxul.so mozilla::dom::quota::QuotaManager::Observer::Observe dom/quota/ActorsParent.cpp:3204
6 libxul.so nsObserverList::NotifyObservers xpcom/ds/nsObserverList.cpp:65
7 libxul.so nsObserverService::NotifyObservers xpcom/ds/nsObserverService.cpp:292
8 libxul.so nsXREDirProvider::DoShutdown toolkit/xre/nsXREDirProvider.cpp:1041
9 libxul.so ScopedXPCOMStartup::~ScopedXPCOMStartup toolkit/xre/nsAppRunner.cpp:1218

I was using Firefox Nightly 76.0a1 (2010-3-9) in the Fedora 32 KDE Plasma spin. I started Firefox and clicked Help > About Nightly. The update downloaded and installed. I clicked Restart. Firefox didn't restart properly. The Firefox crash reporter appeared. I reported the crash. The trace info showed a segmentation fault in __pthread_cond_wait at /usr/src/debug/glibc-2.31/nptl/pthread_cond_wait.c:638 in glibc-2.31-1.fc32.x86_64. The error was MOZ_CRASH(Shutdown hanging before starting.)

Bugbug thinks this bug should belong to this component, but please revert this change in case of error.