Created attachment 712489 [details] 31_84_sec_lock.txt User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:20.0) Gecko/20130210 Firefox/20.0 Build ID: 20130210042017 Steps to reproduce: Minimized window previous evening, expanded window back to normal. Actual results: Browser opens up, and immediately goes into spinlock/unresponsiveness.
Severity: critical → normal
Have you experienced this again since the first time ?
I'm thinking this is related to https://bugzilla.mozilla.org/show_bug.cgi?id=778599 The particular point at which it hangs has moved over to js::NewDenseCopiedArray which is within the above mentioned bug.
See Also: → bug 778599
Assignee: nobody → general
Product: Firefox → Core
Yeah, that does look similar. Do you leave Facebook open for long periods of time? For me, reloading the FB tab would make the problem go away.
As I said in the other bug: If the concat's spinning on NewDenseCopiedArray a lot, that's because (window[x] || ) has a very large dense initialized length, which means window[x] is likely a very large array. Smells like a TE bug to me, that whatever's being fed in there isn't being cleared out correctly over time or something. The value of |x| in that case would probably be informative to a FB engineer.
Left Firefox minimized for couple of hours on Facebook - didn't see any issues, the CPU usge was low. nightly 2013-06-04, mac os x 10.8.3
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