Bug 1741869 Comment 1 Edit History

Note: The actual edited comment in the bug view page will always show the original commenter’s name and original timestamp.

Original comment by

Jason Kratzer [:jkratzer]

on 2021-11-18 05:48:06 PST

While trying to reduce a testcase that triggers the crash information in comment 0, I also see the following signature.

```
==2389766==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7faa49b22d77 bp 0x7fa9b7ec9490 sp 0x7fa9b7ec93c0 T28)
==2389766==The signal is caused by a READ memory access.
==2389766==Hint: address points to the zero page.
    #0 0x7faa49b22d77 in operator! /builds/worker/workspace/obj-build/dist/include/mozilla/RefPtr.h:311:36
    #1 0x7faa49b22d77 in NS_CycleCollectorSuspect3 /builds/worker/checkouts/gecko/xpcom/base/nsCycleCollector.cpp:3758:7
    #2 0x7faa4f8b28a3 in incr<&NS_CycleCollectorSuspect3> /builds/worker/workspace/obj-build/dist/include/nsISupportsImpl.h:248:7
    #3 0x7faa4f8b28a3 in incr<&NS_CycleCollectorSuspect3> /builds/worker/workspace/obj-build/dist/include/nsISupportsImpl.h:234:12
    #4 0x7faa4f8b28a3 in mozilla::DOMEventTargetHelper::AddRef() /builds/worker/checkouts/gecko/dom/events/DOMEventTargetHelper.cpp:86:1
    #5 0x7faa49d3c279 in copyConstruct<mozilla::Variant<nsTimerImpl::UnknownCallback, nsCOMPtr<nsITimerCallback>, nsCOMPtr<nsIObserver>, nsTimerImpl::FuncCallback, nsTimerImpl::ClosureCallback> > /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:224:7
    #6 0x7faa49d3c279 in Variant /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:653:5
    #7 0x7faa49d3c279 in mozilla::Variant<nsTimerImpl::UnknownCallback, nsCOMPtr<nsITimerCallback>, nsCOMPtr<nsIObserver>, nsTimerImpl::FuncCallback, nsTimerImpl::ClosureCallback>::operator=(mozilla::Variant<nsTimerImpl::UnknownCallback, nsCOMPtr<nsITimerCallback>, nsCOMPtr<nsIObserver>, nsTimerImpl::FuncCallback, nsTimerImpl::ClosureCallback> const&) /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:665:32
    #8 0x7faa49d3b321 in nsTimerImpl::Fire(int) /builds/worker/checkouts/gecko/xpcom/threads/nsTimerImpl.cpp:615:24
    #9 0x7faa49ce383f in nsTimerEvent::Run() /builds/worker/checkouts/gecko/xpcom/threads/TimerThread.cpp:265:11
    #10 0x7faa49cf74cb in nsThread::ProcessNextEvent(bool, bool*) /builds/worker/checkouts/gecko/xpcom/threads/nsThread.cpp:1169:16
    #11 0x7faa49cf148e in NS_ProcessPendingEvents(nsIThread*, unsigned int) /builds/worker/checkouts/gecko/xpcom/threads/nsThreadUtils.cpp:432:19
    #12 0x7faa51509844 in mozilla::dom::WorkerPrivate::ClearMainEventQueue(mozilla::dom::WorkerPrivate::WorkerRanOrNot) /builds/worker/checkouts/gecko/dom/workers/WorkerPrivate.cpp:3720:5
    #13 0x7faa514f6ef5 in mozilla::dom::WorkerPrivate::ScheduleDeletion(mozilla::dom::WorkerPrivate::WorkerRanOrNot) /builds/worker/checkouts/gecko/dom/workers/WorkerPrivate.cpp:3547:3
    #14 0x7faa514ccc36 in mozilla::dom::workerinternals::(anonymous namespace)::WorkerThreadPrimaryRunnable::Run() /builds/worker/checkouts/gecko/dom/workers/RuntimeService.cpp:2277:19
    #15 0x7faa49cf74cb in nsThread::ProcessNextEvent(bool, bool*) /builds/worker/checkouts/gecko/xpcom/threads/nsThread.cpp:1169:16
    #16 0x7faa49d01dbc in NS_ProcessNextEvent(nsIThread*, bool) /builds/worker/checkouts/gecko/xpcom/threads/nsThreadUtils.cpp:467:10
    #17 0x7faa4b1f64f1 in mozilla::ipc::MessagePumpForNonMainThreads::Run(base::MessagePump::Delegate*) /builds/worker/checkouts/gecko/ipc/glue/MessagePump.cpp:330:5
    #18 0x7faa4b0745a1 in RunInternal /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:331:10
    #19 0x7faa4b0745a1 in RunHandler /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:324:3
    #20 0x7faa4b0745a1 in MessageLoop::Run() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:306:3
    #21 0x7faa49cefa5f in nsThread::ThreadFunc(void*) /builds/worker/checkouts/gecko/xpcom/threads/nsThread.cpp:391:10
    #22 0x7faa66a1609e in _pt_root /builds/worker/checkouts/gecko/nsprpub/pr/src/pthreads/ptthread.c:201:5
    #23 0x7faa6832c608 in start_thread /build/glibc-eX1tMB/glibc-2.31/nptl/pthread_create.c:477:8
    #24 0x7faa67ef4292 in __clone /build/glibc-eX1tMB/glibc-2.31/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /builds/worker/workspace/obj-build/dist/include/mozilla/RefPtr.h:311:36 in operator!
Thread T28 (DOM Worker) created by T0 (Isolated Web Co) here:
    #0 0x55e719792a8c in __interceptor_pthread_create /builds/worker/fetches/llvm-project/llvm/projects/compiler-rt/lib/asan/asan_interceptors.cpp:207:3
    #1 0x7faa66a06124 in _PR_CreateThread /builds/worker/checkouts/gecko/nsprpub/pr/src/pthreads/ptthread.c:458:14
    #2 0x7faa669f73ce in PR_CreateThread /builds/worker/checkouts/gecko/nsprpub/pr/src/pthreads/ptthread.c:533:12
    #3 0x7faa49cf2d25 in nsThread::Init(nsTSubstring<char> const&) /builds/worker/checkouts/gecko/xpcom/threads/nsThread.cpp:607:18
    #4 0x7faa515292c2 in mozilla::dom::WorkerThread::Create(mozilla::dom::WorkerThreadFriendKey const&) /builds/worker/checkouts/gecko/dom/workers/WorkerThread.cpp:102:7
    #5 0x7faa514ab7f8 in mozilla::dom::workerinternals::RuntimeService::ScheduleWorker(mozilla::dom::WorkerPrivate&) /builds/worker/checkouts/gecko/dom/workers/RuntimeService.cpp:1389:14
    #6 0x7faa514aa4f3 in mozilla::dom::workerinternals::RuntimeService::RegisterWorker(mozilla::dom::WorkerPrivate&) /builds/worker/checkouts/gecko/dom/workers/RuntimeService.cpp:1256:19
    #7 0x7faa514ff320 in mozilla::dom::WorkerPrivate::Constructor(JSContext*, nsTSubstring<char16_t> const&, bool, mozilla::dom::WorkerKind, nsTSubstring<char16_t> const&, nsTSubstring<char> const&, mozilla::dom::WorkerLoadInfo*, mozilla::ErrorResult&, nsTString<char16_t>) /builds/worker/checkouts/gecko/dom/workers/WorkerPrivate.cpp:2525:24
    #8 0x7faa51537756 in mozilla::dom::RemoteWorkerChild::ExecWorkerOnMainThread(mozilla::dom::RemoteWorkerData&&) /builds/worker/checkouts/gecko/dom/workers/remoteworkers/RemoteWorkerChild.cpp:437:41
    #9 0x7faa51554cca in operator() /builds/worker/checkouts/gecko/dom/workers/remoteworkers/RemoteWorkerChild.cpp:298:29
    #10 0x7faa51554cca in mozilla::detail::RunnableFunction<mozilla::dom::RemoteWorkerChild::ExecWorker(mozilla::dom::RemoteWorkerData const&)::$_2>::Run() /builds/worker/workspace/obj-build/dist/include/nsThreadUtils.h:531:5
    #11 0x7faa49cc487f in mozilla::SchedulerGroup::Runnable::Run() /builds/worker/checkouts/gecko/xpcom/threads/SchedulerGroup.cpp:144:20
    #12 0x7faa49d10f72 in mozilla::RunnableTask::Run() /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:468:16
    #13 0x7faa49cd693d in mozilla::TaskController::DoExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&> const&) /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:771:26
    #14 0x7faa49cd3e98 in mozilla::TaskController::ExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&> const&) /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:607:15
    #15 0x7faa49cd45a9 in mozilla::TaskController::ProcessPendingMTTask(bool) /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:391:36
    #16 0x7faa49d1a5e4 in operator() /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:127:37
    #17 0x7faa49d1a5e4 in mozilla::detail::RunnableFunction<mozilla::TaskController::InitializeInternal()::$_1>::Run() /builds/worker/checkouts/gecko/xpcom/threads/nsThreadUtils.h:531:5
    #18 0x7faa49cf6c97 in nsThread::ProcessNextEvent(bool, bool*) /builds/worker/checkouts/gecko/xpcom/threads/nsThread.cpp:1175:16
    #19 0x7faa49d01dbc in NS_ProcessNextEvent(nsIThread*, bool) /builds/worker/checkouts/gecko/xpcom/threads/nsThreadUtils.cpp:467:10
    #20 0x7faa4b1f4bf4 in mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) /builds/worker/checkouts/gecko/ipc/glue/MessagePump.cpp:107:5
    #21 0x7faa4b0745a1 in RunInternal /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:331:10
    #22 0x7faa4b0745a1 in RunHandler /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:324:3
    #23 0x7faa4b0745a1 in MessageLoop::Run() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:306:3
    #24 0x7faa51c15347 in nsBaseAppShell::Run() /builds/worker/checkouts/gecko/widget/nsBaseAppShell.cpp:137:27
    #25 0x7faa566d5d8f in XRE_RunAppShell() /builds/worker/checkouts/gecko/toolkit/xre/nsEmbedFunctions.cpp:917:20
    #26 0x7faa4b0745a1 in RunInternal /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:331:10
    #27 0x7faa4b0745a1 in RunHandler /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:324:3
    #28 0x7faa4b0745a1 in MessageLoop::Run() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:306:3
    #29 0x7faa566d4fc2 in XRE_InitChildProcess(int, char**, XREChildData const*) /builds/worker/checkouts/gecko/toolkit/xre/nsEmbedFunctions.cpp:749:34
    #30 0x55e7197dcced in content_process_main(mozilla::Bootstrap*, int, char**) /builds/worker/checkouts/gecko/browser/app/../../ipc/contentproc/plugin-container.cpp:57:28
    #31 0x55e7197dd118 in main /builds/worker/checkouts/gecko/browser/app/nsBrowserApp.cpp:327:18
    #32 0x7faa67df90b2 in __libc_start_main /build/glibc-eX1tMB/glibc-2.31/csu/../csu/libc-start.c:308:16
```

Revision 1 by

Jason Kratzer [:jkratzer]

on 2021-11-18 05:52:17 PST

While trying to reduce a testcase that triggers the crash signature in comment 0, I also see the following signature.

```
==2389766==ERROR: AddressSanitizer: SEGV on unknown address 0x000000000000 (pc 0x7faa49b22d77 bp 0x7fa9b7ec9490 sp 0x7fa9b7ec93c0 T28)
==2389766==The signal is caused by a READ memory access.
==2389766==Hint: address points to the zero page.
    #0 0x7faa49b22d77 in operator! /builds/worker/workspace/obj-build/dist/include/mozilla/RefPtr.h:311:36
    #1 0x7faa49b22d77 in NS_CycleCollectorSuspect3 /builds/worker/checkouts/gecko/xpcom/base/nsCycleCollector.cpp:3758:7
    #2 0x7faa4f8b28a3 in incr<&NS_CycleCollectorSuspect3> /builds/worker/workspace/obj-build/dist/include/nsISupportsImpl.h:248:7
    #3 0x7faa4f8b28a3 in incr<&NS_CycleCollectorSuspect3> /builds/worker/workspace/obj-build/dist/include/nsISupportsImpl.h:234:12
    #4 0x7faa4f8b28a3 in mozilla::DOMEventTargetHelper::AddRef() /builds/worker/checkouts/gecko/dom/events/DOMEventTargetHelper.cpp:86:1
    #5 0x7faa49d3c279 in copyConstruct<mozilla::Variant<nsTimerImpl::UnknownCallback, nsCOMPtr<nsITimerCallback>, nsCOMPtr<nsIObserver>, nsTimerImpl::FuncCallback, nsTimerImpl::ClosureCallback> > /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:224:7
    #6 0x7faa49d3c279 in Variant /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:653:5
    #7 0x7faa49d3c279 in mozilla::Variant<nsTimerImpl::UnknownCallback, nsCOMPtr<nsITimerCallback>, nsCOMPtr<nsIObserver>, nsTimerImpl::FuncCallback, nsTimerImpl::ClosureCallback>::operator=(mozilla::Variant<nsTimerImpl::UnknownCallback, nsCOMPtr<nsITimerCallback>, nsCOMPtr<nsIObserver>, nsTimerImpl::FuncCallback, nsTimerImpl::ClosureCallback> const&) /builds/worker/workspace/obj-build/dist/include/mozilla/Variant.h:665:32
    #8 0x7faa49d3b321 in nsTimerImpl::Fire(int) /builds/worker/checkouts/gecko/xpcom/threads/nsTimerImpl.cpp:615:24
    #9 0x7faa49ce383f in nsTimerEvent::Run() /builds/worker/checkouts/gecko/xpcom/threads/TimerThread.cpp:265:11
    #10 0x7faa49cf74cb in nsThread::ProcessNextEvent(bool, bool*) /builds/worker/checkouts/gecko/xpcom/threads/nsThread.cpp:1169:16
    #11 0x7faa49cf148e in NS_ProcessPendingEvents(nsIThread*, unsigned int) /builds/worker/checkouts/gecko/xpcom/threads/nsThreadUtils.cpp:432:19
    #12 0x7faa51509844 in mozilla::dom::WorkerPrivate::ClearMainEventQueue(mozilla::dom::WorkerPrivate::WorkerRanOrNot) /builds/worker/checkouts/gecko/dom/workers/WorkerPrivate.cpp:3720:5
    #13 0x7faa514f6ef5 in mozilla::dom::WorkerPrivate::ScheduleDeletion(mozilla::dom::WorkerPrivate::WorkerRanOrNot) /builds/worker/checkouts/gecko/dom/workers/WorkerPrivate.cpp:3547:3
    #14 0x7faa514ccc36 in mozilla::dom::workerinternals::(anonymous namespace)::WorkerThreadPrimaryRunnable::Run() /builds/worker/checkouts/gecko/dom/workers/RuntimeService.cpp:2277:19
    #15 0x7faa49cf74cb in nsThread::ProcessNextEvent(bool, bool*) /builds/worker/checkouts/gecko/xpcom/threads/nsThread.cpp:1169:16
    #16 0x7faa49d01dbc in NS_ProcessNextEvent(nsIThread*, bool) /builds/worker/checkouts/gecko/xpcom/threads/nsThreadUtils.cpp:467:10
    #17 0x7faa4b1f64f1 in mozilla::ipc::MessagePumpForNonMainThreads::Run(base::MessagePump::Delegate*) /builds/worker/checkouts/gecko/ipc/glue/MessagePump.cpp:330:5
    #18 0x7faa4b0745a1 in RunInternal /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:331:10
    #19 0x7faa4b0745a1 in RunHandler /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:324:3
    #20 0x7faa4b0745a1 in MessageLoop::Run() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:306:3
    #21 0x7faa49cefa5f in nsThread::ThreadFunc(void*) /builds/worker/checkouts/gecko/xpcom/threads/nsThread.cpp:391:10
    #22 0x7faa66a1609e in _pt_root /builds/worker/checkouts/gecko/nsprpub/pr/src/pthreads/ptthread.c:201:5
    #23 0x7faa6832c608 in start_thread /build/glibc-eX1tMB/glibc-2.31/nptl/pthread_create.c:477:8
    #24 0x7faa67ef4292 in __clone /build/glibc-eX1tMB/glibc-2.31/misc/../sysdeps/unix/sysv/linux/x86_64/clone.S:95

AddressSanitizer can not provide additional info.
SUMMARY: AddressSanitizer: SEGV /builds/worker/workspace/obj-build/dist/include/mozilla/RefPtr.h:311:36 in operator!
Thread T28 (DOM Worker) created by T0 (Isolated Web Co) here:
    #0 0x55e719792a8c in __interceptor_pthread_create /builds/worker/fetches/llvm-project/llvm/projects/compiler-rt/lib/asan/asan_interceptors.cpp:207:3
    #1 0x7faa66a06124 in _PR_CreateThread /builds/worker/checkouts/gecko/nsprpub/pr/src/pthreads/ptthread.c:458:14
    #2 0x7faa669f73ce in PR_CreateThread /builds/worker/checkouts/gecko/nsprpub/pr/src/pthreads/ptthread.c:533:12
    #3 0x7faa49cf2d25 in nsThread::Init(nsTSubstring<char> const&) /builds/worker/checkouts/gecko/xpcom/threads/nsThread.cpp:607:18
    #4 0x7faa515292c2 in mozilla::dom::WorkerThread::Create(mozilla::dom::WorkerThreadFriendKey const&) /builds/worker/checkouts/gecko/dom/workers/WorkerThread.cpp:102:7
    #5 0x7faa514ab7f8 in mozilla::dom::workerinternals::RuntimeService::ScheduleWorker(mozilla::dom::WorkerPrivate&) /builds/worker/checkouts/gecko/dom/workers/RuntimeService.cpp:1389:14
    #6 0x7faa514aa4f3 in mozilla::dom::workerinternals::RuntimeService::RegisterWorker(mozilla::dom::WorkerPrivate&) /builds/worker/checkouts/gecko/dom/workers/RuntimeService.cpp:1256:19
    #7 0x7faa514ff320 in mozilla::dom::WorkerPrivate::Constructor(JSContext*, nsTSubstring<char16_t> const&, bool, mozilla::dom::WorkerKind, nsTSubstring<char16_t> const&, nsTSubstring<char> const&, mozilla::dom::WorkerLoadInfo*, mozilla::ErrorResult&, nsTString<char16_t>) /builds/worker/checkouts/gecko/dom/workers/WorkerPrivate.cpp:2525:24
    #8 0x7faa51537756 in mozilla::dom::RemoteWorkerChild::ExecWorkerOnMainThread(mozilla::dom::RemoteWorkerData&&) /builds/worker/checkouts/gecko/dom/workers/remoteworkers/RemoteWorkerChild.cpp:437:41
    #9 0x7faa51554cca in operator() /builds/worker/checkouts/gecko/dom/workers/remoteworkers/RemoteWorkerChild.cpp:298:29
    #10 0x7faa51554cca in mozilla::detail::RunnableFunction<mozilla::dom::RemoteWorkerChild::ExecWorker(mozilla::dom::RemoteWorkerData const&)::$_2>::Run() /builds/worker/workspace/obj-build/dist/include/nsThreadUtils.h:531:5
    #11 0x7faa49cc487f in mozilla::SchedulerGroup::Runnable::Run() /builds/worker/checkouts/gecko/xpcom/threads/SchedulerGroup.cpp:144:20
    #12 0x7faa49d10f72 in mozilla::RunnableTask::Run() /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:468:16
    #13 0x7faa49cd693d in mozilla::TaskController::DoExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&> const&) /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:771:26
    #14 0x7faa49cd3e98 in mozilla::TaskController::ExecuteNextTaskOnlyMainThreadInternal(mozilla::detail::BaseAutoLock<mozilla::Mutex&> const&) /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:607:15
    #15 0x7faa49cd45a9 in mozilla::TaskController::ProcessPendingMTTask(bool) /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:391:36
    #16 0x7faa49d1a5e4 in operator() /builds/worker/checkouts/gecko/xpcom/threads/TaskController.cpp:127:37
    #17 0x7faa49d1a5e4 in mozilla::detail::RunnableFunction<mozilla::TaskController::InitializeInternal()::$_1>::Run() /builds/worker/checkouts/gecko/xpcom/threads/nsThreadUtils.h:531:5
    #18 0x7faa49cf6c97 in nsThread::ProcessNextEvent(bool, bool*) /builds/worker/checkouts/gecko/xpcom/threads/nsThread.cpp:1175:16
    #19 0x7faa49d01dbc in NS_ProcessNextEvent(nsIThread*, bool) /builds/worker/checkouts/gecko/xpcom/threads/nsThreadUtils.cpp:467:10
    #20 0x7faa4b1f4bf4 in mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) /builds/worker/checkouts/gecko/ipc/glue/MessagePump.cpp:107:5
    #21 0x7faa4b0745a1 in RunInternal /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:331:10
    #22 0x7faa4b0745a1 in RunHandler /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:324:3
    #23 0x7faa4b0745a1 in MessageLoop::Run() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:306:3
    #24 0x7faa51c15347 in nsBaseAppShell::Run() /builds/worker/checkouts/gecko/widget/nsBaseAppShell.cpp:137:27
    #25 0x7faa566d5d8f in XRE_RunAppShell() /builds/worker/checkouts/gecko/toolkit/xre/nsEmbedFunctions.cpp:917:20
    #26 0x7faa4b0745a1 in RunInternal /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:331:10
    #27 0x7faa4b0745a1 in RunHandler /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:324:3
    #28 0x7faa4b0745a1 in MessageLoop::Run() /builds/worker/checkouts/gecko/ipc/chromium/src/base/message_loop.cc:306:3
    #29 0x7faa566d4fc2 in XRE_InitChildProcess(int, char**, XREChildData const*) /builds/worker/checkouts/gecko/toolkit/xre/nsEmbedFunctions.cpp:749:34
    #30 0x55e7197dcced in content_process_main(mozilla::Bootstrap*, int, char**) /builds/worker/checkouts/gecko/browser/app/../../ipc/contentproc/plugin-container.cpp:57:28
    #31 0x55e7197dd118 in main /builds/worker/checkouts/gecko/browser/app/nsBrowserApp.cpp:327:18
    #32 0x7faa67df90b2 in __libc_start_main /build/glibc-eX1tMB/glibc-2.31/csu/../csu/libc-start.c:308:16
```

Back to Bug 1741869 Comment 1