Firefox makes X hang when viewing big images

[Roland Hieber]

I've experienced some times now that when I load big images in Firefox, the X server hangs. This occurs with a default Firefox profile, and for example reproducible on http://sortvis.org/algorithms/bubblesort.html (needs JavaScript). In this case, Xorg goes up to 100% CPU, and I does not react to key presses (except when using the SysRq shortcuts to kill it). I have a backtrace (see gdb-Xorg-direct.txt), with Xorg started from gdb as root, and then browsing Firefox to the mentioned URL. From the backtrace, it seems to be related with libpixman; however, when I install libpixman-1-0-dbg to get a reasonable backtrace, the X hangs do not occur anymore...

I am currently using Ubuntu Lucid LTS, with Firefox 3.6.18+build2+nobinonly-0ubuntu0.10.04.2 from lucid-updates.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: firefox 3.6.18+build2+nobinonly-0ubuntu0.10.04.2
ProcVersionSignature: Ubuntu 2.6.32-32.62-generic 2.6.32.38+drm33.16
Uname: Linux 2.6.32-32-generic x86_64
Architecture: amd64
Date: Mon Aug 8 21:10:39 2011
EcryptfsInUse: Yes
FirefoxPackages:
 firefox 3.6.18+build2+nobinonly-0ubuntu0.10.04.2
 firefox-gnome-support 3.6.18+build2+nobinonly-0ubuntu0.10.04.2
 firefox-branding 3.6.18+build2+nobinonly-0ubuntu0.10.04.2
 abroswer N/A
 abrowser-branding N/A
SourcePackage: firefox

[Roland Hieber (rohieb)]

I was able to get a backtrace with libpixman debug symbols. The problem persists, but I was able to browse various other pages of the site before X hung again.

[KK (kk1986-deactivatedaccount)]

Thanks for reporting this problem.

I am not able to reproduce this by going to the address you gave while using FF 3.6.20. You're report says you were using 3.6.18 at the time. Are you still having this problem after updating Firefox?

[Roland Hieber (rohieb)]

After a few tries, FF 3.6.21 seems to be okay with sites that crashed
earlier.

[KK (kk1986-deactivatedaccount)]

I'm glad the issue's been resolved, thanks for letting us know.