Bugzilla

So from the SIGABRT we see that this is an instance of bug 1279293 happening in our CI.

The stack trace of the content process shows us, that we are there in `ShutdownPhase::XPCOMWillShutdown` and that notifies a JS observer that in turn spins an event loop. That could just be the JS async shutdown handling for that phase (I see only one other JS observer for "xpcom-will-shutdown" in `DownloadIntegration.sys.mjs`). So we are waiting probably [for one out of these](https://searchfox.org/mozilla-central/search?q=GetXpcomWillShutdown&path=&case=true&regexp=false) when the parent process decides to kill us.

It seems as if we did not yet dupe any such intermittent to bug 1279293, so not sure if we should. However we have [plenty of similar intermittent bugs](https://bugzilla.mozilla.org/buglist.cgi?query_format=advanced&longdesc=SIGABRT&resolution=---&keywords_type=allwords&keywords=intermittent-failure%2C%20&classification=Client%20Software&classification=Developer%20Infrastructure&classification=Components&classification=Server%20Software&classification=Other&longdesc_type=allwordssubstr&list_id=17119621), we should probably start to dupe them somewhere.

So from the SIGABRT and the earlier "Process 2020 hanging at shutdown; attempting crash report" message we see that this is an instance of bug 1279293 happening in our CI.

The stack trace of the content process shows us, that we are there in `ShutdownPhase::XPCOMWillShutdown` and that notifies a JS observer that in turn spins an event loop. That could just be the JS async shutdown handling for that phase (I see only one other JS observer for "xpcom-will-shutdown" in `DownloadIntegration.sys.mjs`). So we are waiting probably [for one out of these](https://searchfox.org/mozilla-central/search?q=GetXpcomWillShutdown&path=&case=true&regexp=false) when the parent process decides to kill us.

It seems as if we did not yet dupe any such intermittent to bug 1279293, so not sure if we should. However we have [plenty of similar intermittent bugs](https://bugzilla.mozilla.org/buglist.cgi?query_format=advanced&longdesc=SIGABRT&resolution=---&keywords_type=allwords&keywords=intermittent-failure%2C%20&classification=Client%20Software&classification=Developer%20Infrastructure&classification=Components&classification=Server%20Software&classification=Other&longdesc_type=allwordssubstr&list_id=17119621), we should probably start to dupe them somewhere.