1893353 - Startup crash in [@ nsAutoRefCnt::operator++]

Status: NEW

(Core :: XPCOM, defect)

Description

[BugBot [:suhaib / :marco/ :calixte]]

Crash report: https://crash-stats.mozilla.org/report/index/07215def-6667-400d-b751-7aeb80240424

Reason: EXCEPTION_ILLEGAL_INSTRUCTION

Top 10 frames of crashing thread:

0  xul.dll  nsAutoRefCnt::operator++  xpcom/base/nsISupportsImpl.h:354
0  xul.dll  nsAboutCache::Channel::AddRef  dom/media/webrtc/common/browser_logging/WebRtcLog.cpp:69
1  xul.dll  mozilla::RefPtrTraits<nsIToolkitProfile>::AddRef  mfbt/RefPtr.h:48
1  xul.dll  nsCOMPtr<nsIToolkitProfile>::assign_with_AddRef  xpcom/base/nsCOMPtr.h:811
1  xul.dll  nsCOMPtr<nsIToolkitProfile>::operator=  xpcom/base/nsCOMPtr.h:591
1  xul.dll  nsToolkitProfileService::Init  toolkit/profile/nsToolkitProfileService.cpp:1031
2  xul.dll  NS_GetToolkitProfileService  toolkit/profile/nsToolkitProfileService.cpp:2189
3  xul.dll  XREMain::XRE_mainStartup  toolkit/xre/nsAppRunner.cpp:4870
4  xul.dll  XREMain::XRE_main  toolkit/xre/nsAppRunner.cpp:5946
5  xul.dll  XRE_main  toolkit/xre/nsAppRunner.cpp:6015

By querying Nightly crashes reported within the last 2 months, here are some insights about the signature:

• First crash report: 2024-04-08
• Process type: Multiple distinct types
• Is startup crash: Yes - 7 out of 8 crashes happened during startup
• Has user comments: No
• Is null crash: Yes - 2 out of 8 crashes happened on null or near null memory address

Comment 1

[Nico Grunbaum [:ng, @chew:mozilla.org]]

This signature has placed numerous, unrelated, low frequency crashes in the same bucket. WebRTC does not seem to be particularly representative of the crash population.

Comment 2

[Byron Campen [:bwc]]

I've looked at this, and this is not happening in any one place consistently. I have not found a webrtc related instance. If someone has seen one, please send a link so I can file a more specific bug.