Hi,
This bug also affects Konsole in KDE, using Kwin as window manager. When I try
to (un-)maximize the Konsole window, the X server infrequently segfaults. It
seems to happen about 20% of the time, with chances increasing when the X
session has been running longer. Extensive dragging of Konsole windows across
screens can consistently crash the X server. I've also managed to reproduce the
crash using a closed-source Qt application once.
A quick Google search turned up the following relevant information:
(*) ArchLinux and Gentoo are affected too:
https://bbs.archlinux.org/viewtopic.php?pid=1176889
http://forums.gentoo.org/viewtopic-t-955708-start-0.html
(*) 13.1 should have fixed this, but it doesn't work. There's a report of
12.6 working for someone (I haven't tried it yet).
http://forum.kde.org/viewtopic.php?f=227&t=109597
(*) It has already been reported upstream, where someone mentioned that it
only happens in multimontior environments, which might be true; I'm
using one.
http://ati.cchtml.com/show_bug.cgi?id=724
For reference, the relevant part from my Xorg.0.log:
[ 15420.810]
[ 15420.810] Backtrace:
[ 15420.810] 0: /usr/bin/X (xorg_backtrace+0x36) [0x7fe526771d06]
[ 15420.811] 1: /usr/bin/X (0x7fe5265f3000+0x182859) [0x7fe526775859]
[ 15420.811] 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7fe525919000+0xf210)
[0x7fe525928210]
[ 15420.811] 3: /usr/lib/x86_64-linux-gnu/libpixman-1.so.0
(0x7fe525693000+0x727ed) [0x7fe5257057ed]
[ 15420.811] 4: /usr/lib/x86_64-linux-gnu/libpixman-1.so.0
(0x7fe525693000+0x72b5f) [0x7fe525705b5f]
[ 15420.811] 5: /usr/lib/x86_64-linux-gnu/libpixman-1.so.0 (pixman_blt+0x52)
[0x7fe52569d8b2]
[ 15420.811] 6: /usr/lib/xorg/modules/libfb.so (fbCopyNtoN+0x2c9)
[0x7fe521480469]
[ 15420.811] 7: /usr/lib/xorg/modules/glesx.so (0x7fe51e4a8000+0x758c1)
[0x7fe51e51d8c1]
[ 15420.811] 8: /usr/lib/xorg/modules/glesx.so (0x7fe51e4a8000+0x77c25)
[0x7fe51e51fc25]
[ 15420.811] 9: /usr/bin/X (0x7fe5265f3000+0x110a79) [0x7fe526703a79]
[ 15420.811] 10: /usr/bin/X (0x7fe5265f3000+0xd9955) [0x7fe5266cc955]
[ 15420.811] 11: /usr/bin/X (0x7fe5265f3000+0xdacaf) [0x7fe5266cdcaf]
[ 15420.811] 12: /usr/bin/X (0x7fe5265f3000+0xd7e1c) [0x7fe5266cae1c]
[ 15420.811] 13: /usr/bin/X (ConfigureWindow+0x378) [0x7fe52666eec8]
[ 15420.811] 14: /usr/bin/X (0x7fe5265f3000+0x4d904) [0x7fe526640904]
[ 15420.811] 15: /usr/bin/X (0x7fe5265f3000+0x52e61) [0x7fe526645e61]
[ 15420.811] 16: /usr/bin/X (0x7fe5265f3000+0x41ec5) [0x7fe526634ec5]
[ 15420.812] 17: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xf5)
[0x7fe5245a4a55]
[ 15420.812] 18: /usr/bin/X (0x7fe5265f3000+0x4219d) [0x7fe52663519d]
[ 15420.812]
[ 15420.812] Segmentation fault at address 0x7fe4f9c15000
[ 15420.812]
Fatal server error:
[ 15420.812] Caught signal 11 (Segmentation fault). Server aborting
[ 15420.812]
[ 15420.812]
Please consult the The X.Org Foundation support
at http://wiki.x.org
for help.
[ 15420.812] Please also check the log file at "/var/log/Xorg.0.log" for
additional information.
I'm using kernel 3.8, but can also reproduce the crash with 3.6. X and fglrx
stack from testing installed (xserver-xorg-core 2:1.12.4-6, fglrx-driver
1:13.4-2).
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