1238299 - Infinite loop in RestyleTracker::DoProcessRestyles()

Status: NEW

(Core :: Layout, defect)

Description

[Kartikaya Gupta (email:[e-mail])]

Attachment: One of the backtraces in the infinite loop

Firefox nightly on OS X, with e10s enabled. I ran into what appeared to be an infinite loop in the content process - none of the tabs I had were responding although the chrome process stuff seemed kind of responsive. I attached lldb to the plugin-container process and got the attached backtrace. I also let it continue and stopped it a few more times - each time I got a backtrace it was in the same style processing code somewhere. I used the "fin" command in lldb to finish stack frames one at a time, and when I tried to fin the DoProcessRestyles stack frame it wouldn't complete, so I assume the infinite loop is in that function somewhere. I was able to repeat this a few times during the debugging session.

I'm not sure if this issue is 100% reproducible but it happened to me three times (I only debugged it the first time). It seems to always happen while loading pages from meetup.com; the two tabs that I had open were http://www.meetup.com/Hacking-Health-Hamilton/ and http://www.meetup.com/Hamilton-Westdale-Badminton-Meetup/ and it would lock up while trying to load these pages. I opened these tabs a couple of weeks ago without issue, so either the pages have changed since then or this is a recent regression.

Comment 1

[Myk Melez [:myk] [@mykmelez]]

Attachment: backtrace for hang on http://www.meetup.com/Docker-meetups/

I'm unsure if this is identical, although it sure looks similar, and it happens on a Meetup page.  I've also tested in a non-e10s window, where the page also hangs (and takes the chrome process with it, of course).  I can reproduce consistently on the latest Nightly when loading http://www.meetup.com/Docker-meetups/ but can't reproduce at all on DevEdition.