1960501 - Crash in [@ mozilla::LinkedListElement<T>::isInList] via WebTaskQueue::HasScheduledTasks()

Status: RESOLVED FIXED

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

Description

[Andrew McCreight [:mccr8]]

Crash report: https://crash-stats.mozilla.org/report/index/44eba1f8-41ff-4ba7-9454-d272d0250414

Reason:

EXCEPTION_ACCESS_VIOLATION_READ

Top 10 frames:

0  xul.dll  mozilla::LinkedListElement<RefPtr<mozilla::dom::WebTask> >::isInList() const  mfbt/LinkedList.h:290
0  xul.dll  mozilla::LinkedList<RefPtr<mozilla::dom::WebTask> >::isEmpty() const  mfbt/LinkedList.h:570
0  xul.dll  mozilla::dom::WebTaskQueue::HasScheduledTasks() const  dom/webscheduling/WebTaskScheduler.h:236
0  xul.dll  mozilla::dom::WebTaskScheduler::DispatchTask(mozilla::dom::WebTask*, mozilla:...  dom/webscheduling/WebTaskScheduler.cpp:485
1  xul.dll  mozilla::dom::DelayedWebTaskHandler::Call(char const*)  dom/webscheduling/WebTaskScheduler.h:350
2  xul.dll  nsGlobalWindowInner::RunTimeoutHandler(mozilla::dom::Timeout*)  dom/base/nsGlobalWindowInner.cpp:6324
3  xul.dll  mozilla::dom::TimeoutManager::RunTimeout(mozilla::TimeStamp const&, mozilla::...  dom/base/TimeoutManager.cpp:944
3  xul.dll  mozilla::dom::TimeoutExecutor::MaybeExecute()  dom/base/TimeoutExecutor.cpp:179
4  xul.dll  mozilla::dom::TimeoutExecutor::Run()  dom/base/TimeoutExecutor.cpp:234
5  xul.dll  mozilla::ThrottledEventQueue::Inner::ExecuteRunnable()  xpcom/threads/ThrottledEventQueue.cpp:254

I found this via the crash spike reporter. Looks like a Nightly regression? Null deref in WebTaskScheduler code somewhere.

Comment 1

[Sean Feng [:sefeng]]

Looks like the taskqueue could be gone for delayed tasks, looking

Comment 2

[Sean Feng [:sefeng]]

Attachment: Bug 1960501 - Do not try to run delayed web tasks when the scheduler is disconnected r=mccr8

I think this bug is about a case where the scheduler was CC'd,
and then the delayed tasks tried to run.

Comment 3

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/f975d7f9d4b7
Do not try to run delayed web tasks when the scheduler is disconnected r=mccr8

Comment 4

[agoloman]

https://hg.mozilla.org/mozilla-central/rev/f975d7f9d4b7