1318102 - [e10s] Crash in nsCOMArray_base::InsertObjectAt

Status: RESOLVED WORKSFORME

(External Software Affecting Firefox :: Other, defect)

Description

[[:philipp]]

[Tracking Requested - why for this release]:

This bug was filed from the Socorro interface and is 
report bp-06a33b17-1184-4573-8d99-399f42161116.
=============================================================
Crashing Thread (0)
Frame 	Module 	Signature 	Source
0 	xul.dll 	nsCOMArray_base::InsertObjectAt(nsISupports*, int) 	xpcom/glue/nsCOMArray.cpp:138
1 	xul.dll 	nsObserverList::AppendStrongObservers(nsCOMArray<nsIObserver>&) 	xpcom/ds/nsObserverList.cpp:98
2 	xul.dll 	nsObserverService::UnmarkGrayStrongObservers() 	xpcom/ds/nsObserverService.cpp:327
3 	xul.dll 	nsCCUncollectableMarker::Observe(nsISupports*, char const*, char16_t const*) 	dom/base/nsCCUncollectableMarker.cpp:453
4 	xul.dll 	nsObserverList::NotifyObservers(nsISupports*, char const*, char16_t const*) 	xpcom/ds/nsObserverList.cpp:112
5 	xul.dll 	nsObserverService::NotifyObservers(nsISupports*, char const*, char16_t const*) 	xpcom/ds/nsObserverService.cpp:305
6 	xul.dll 	XPCJSRuntime::PrepareForForgetSkippable() 	js/xpconnect/src/XPCJSRuntime.cpp:665
7 	xul.dll 	nsCycleCollector::ForgetSkippable(bool, bool) 	xpcom/base/nsCycleCollector.cpp:2879
8 	xul.dll 	nsCycleCollector_forgetSkippable(bool, bool) 	xpcom/base/nsCycleCollector.cpp:4110
9 	xul.dll 	FireForgetSkippable 	dom/base/nsJSEnvironment.cpp:1245
10 	xul.dll 	CCTimerFired 	dom/base/nsJSEnvironment.cpp:1793
11 	xul.dll 	nsTimerImpl::Fire() 	xpcom/threads/nsTimerImpl.cpp:524
12 	xul.dll 	nsTimerEvent::Run() 	xpcom/threads/TimerThread.cpp:286
13 	xul.dll 	nsThread::ProcessNextEvent(bool, bool*) 	xpcom/threads/nsThread.cpp:1076
14 	xul.dll 	mozilla::ipc::MessagePump::Run(base::MessagePump::Delegate*) 	ipc/glue/MessagePump.cpp:100
15 	xul.dll 	mozilla::ipc::MessagePumpForChildProcess::Run(base::MessagePump::Delegate*) 	ipc/glue/MessagePump.cpp:317
16 	xul.dll 	_SEH_epilog4

this is an top crash in early stability data from the firefox 50.0 release, so far on windows vista and higher - in 50 the signature seems to always happen in the content process & right now it's making up 9.2% of all content crashes there.
some comments indicate that this started happening for users after the update (though the signature in general has been around for a while) & it's happening repeatedly on single installations.

there is a significant correlation of this crash on 50 to the presence of the module "AcGenral.dll" which seems to be used for "application compatibility updates" on windows.

Comment 1

[[:philipp]]

looks adware/malware-related: 
(00.74% in signature vs 91.25% overall) app_init_dlls = null
(92.18% in signature vs 02.74% overall) app_init_dlls = %ProgramFiles%\SearchProtect\SearchProtect\bin\VC32Loader.dll

Comment 2

[[:philipp]]

this is now declining on its own again - i guess the malware received a "compatibility update" for firefox 50 :-/