Seen while looking at recent trunk crash data. Crashes started showing up using the 20111010 build. https://crash-stats.mozilla.com/report/list?signature=mozilla::a11y::FocusManager::ProcessFocusEvent(AccEvent*) Possible pushlog regression range: http://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=b4da2d439cbc&tochange=e9c620a5c85f Comments mention sorting bookmarks with the bookmark manager and bookmarking a page. https://crash-stats.mozilla.com/report/index/b0fb653a-ad02-4755-bdc2-29c4b2111010 Frame Module Signature [Expand] Source 0 xul.dll mozilla::a11y::FocusManager::ProcessFocusEvent accessible/src/base/FocusManager.cpp:343 1 xul.dll nsTArray_base<nsTArrayInfallibleAllocator>::SwapArrayElements<nsTArrayDefaultAllocator> obj-firefox/dist/include/nsTArray-inl.h:337 2 xul.dll NotificationController::WillRefresh accessible/src/base/NotificationController.cpp:321 3 xul.dll xul.dll@0x99170f 4 xul.dll nsRefreshDriver::Notify layout/base/nsRefreshDriver.cpp:326 5 xul.dll nsAppShell::ProcessNextNativeEvent widget/src/windows/nsAppShell.cpp:362 6 nspr4.dll MD_CURRENT_THREAD nsprpub/pr/src/md/windows/w95thred.c:308 7 xul.dll nsDocument::Release content/base/src/nsDocument.cpp:1712 8 nspr4.dll MD_CURRENT_THREAD nsprpub/pr/src/md/windows/w95thred.c:308 9 xul.dll nsCOMPtr_base::~nsCOMPtr_base obj-firefox/xpcom/build/nsCOMPtr.cpp:81 10 nspr4.dll PR_Unlock nsprpub/pr/src/threads/combined/prulock.c:347 11 xul.dll mozilla::TimeDuration::ToSeconds xpcom/ds/TimeStamp.cpp:63 12 xul.dll nsEventQueue::GetEvent xpcom/threads/nsEventQueue.cpp:80 13 xul.dll TimerThread::UpdateFilter xpcom/threads/TimerThread.cpp:222 14 xul.dll nsTimerImpl::Fire xpcom/threads/nsTimerImpl.cpp:427 15 xul.dll nsTimerEvent::Run xpcom/threads/nsTimerImpl.cpp:520 16 xul.dll nsThread::ProcessNextEvent xpcom/threads/nsThread.cpp:631 17 xul.dll TimerThread::RemoveTimer xpcom/threads/TimerThread.cpp:420 18 xul.dll NS_ProcessNextEvent_P obj-firefox/xpcom/build/nsThreadUtils.cpp:245 19 xul.dll mozilla::ipc::MessagePump::Run ipc/glue/MessagePump.cpp:110 20 xul.dll MessageLoop::RunHandler ipc/chromium/src/base/message_loop.cc:201 21 xul.dll MessageLoop::Run ipc/chromium/src/base/message_loop.cc:175 22 msvcr90.dll getenv_helper_nolock 23 xul.dll nsThreadManager::GetCurrentThread xpcom/threads/nsThreadManager.cpp:218 24 xul.dll nsBaseAppShell::Run widget/src/xpwidgets/nsBaseAppShell.cpp:189 25 xul.dll nsAppStartup::Run toolkit/components/startup/nsAppStartup.cpp:228 26 xul.dll XRE_main toolkit/xre/nsAppRunner.cpp:3582 27 mozutils.dll arena_run_alloc memory/jemalloc/jemalloc.c:3276

should be fixed by bug 506206

This is code that was introduced in bug 691734.

fixed by bug 506206