I appear to have this as well, although the backtrace is slightly different
(earlier in _mesa_update_state_locked and an extra level):
Backtrace:
0: /usr/bin/X(xf86SigHandler+0x6d) [0x48672d]
1: /lib/libc.so.6 [0x7fefc28f67d0]
2: /usr/lib/xorg/modules/extensions//libGLcore.so(xmesa_update_state+0x42)
[0x7fef9f69f8a2]
3:
/usr/lib/xorg/modules/extensions//libGLcore.so(_mesa_update_state_locked+0x455)
[0x7fef9f5c3d25]
4: /usr/lib/xorg/modules/extensions//libGLcore.so(_mesa_update_state+0x11)
[0x7fef9f5c4121]
5: /usr/lib/xorg/modules/extensions//libGLcore.so(_mesa_Clear+0x108)
[0x7fef9f55f2e8]
6: /usr/lib/xorg/modules/extensions//libglx.so(DoRender+0x13b) [0x7fefc18e945b]
7: /usr/lib/xorg/modules/extensions//libglx.so [0x7fefc18ed00d]
8: /usr/bin/X(Dispatch+0x1db) [0x4514eb]
9: /usr/bin/X(main+0x45d) [0x439f4d]
10: /lib/libc.so.6(__libc_start_main+0xf4) [0x7fefc28e2b44]
11: /usr/bin/X(FontFileCompleteXLFD+0x231) [0x439249]
It is with the i810 driver and dual head with different sizes for the monitors
(the laptop has native 1440x900 and the CRT is a normal one using 1280x1024).
Also, using the 'blank screen' screensaver doesn't crash. And the 'flying
ubuntu' screen saver doesn't crash.
My guess would be that GL based screensavers crash. And DRI is not available
for me on this specific setup.
This is with gutsy:
ii xserver-xorg-video-i810 2:1.7.4-0ubuntu5 X.Org X server -- Intel
i8xx, i9xx display driver
ii gnome-screensaver 2.20.0-0ubuntu4.2 a screen saver and
locker
ii xscreensaver-data 4.24-5ubuntu3 data files to be shared
among screensaver frontends
ii xscreensaver-gl 4.24-5ubuntu3 GL(Mesa) screen hacks
for xscreensaver
Feel free to ask more specific information. I just don't know what else is
relevant here.
I also don't mind trying a patched .deb or installing debug packages.
--
[gutsy] dualhead + locking system xorg crashes (915GM) (i810 driver)
https://bugs.launchpad.net/bugs/153878
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Desktop Bugs, which is a bug contact for gnome-screensaver in ubuntu.
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