1674139 - Crash in [@ mozilla::dom::Document::UnregisterActivityObserver]

Status: RESOLVED DUPLICATE of bug 1672876

(Core :: DOM: Core & HTML, defect)

Description

[Sean Feng [:sefeng]]

Crash report: https://crash-stats.mozilla.org/report/index/276d43c0-51ba-45c4-9e06-d829b0201028

Reason: EXCEPTION_ACCESS_VIOLATION_READ

Top 10 frames of crashing thread:

0 xul.dll mozilla::dom::Document::UnregisterActivityObserver dom/base/Document.cpp:12180
1 xul.dll mozilla::dom::MediaSession::Shutdown dom/media/mediasession/MediaSession.cpp:62
2 xul.dll mozilla::dom::Navigator::Invalidate dom/base/Navigator.cpp:236
3 xul.dll mozilla::dom::Navigator::cycleCollection::Unlink dom/base/Navigator.cpp:135
4 xul.dll nsCycleCollector::Collect xpcom/base/nsCycleCollector.cpp:3432
5 xul.dll nsCycleCollector_collectSlice xpcom/base/nsCycleCollector.cpp:3920
6 xul.dll static nsJSContext::RunCycleCollectorSlice dom/base/nsJSEnvironment.cpp:1458
7 xul.dll ICCRunnerFired dom/base/nsJSEnvironment.cpp:1501
8 xul.dll virtual bool std::_Func_impl_no_alloc<bool  
9 xul.dll mozilla::IdleTaskRunner::Run xpcom/threads/IdleTaskRunner.cpp:54

This is a low frequent crash. Seems like a null pointer dereferencing by looking at the crash addresses.

Comment 1

[Jens Stutte [:jstutte]]

Seems a nullptr of mDoc here.