Comment 0 for bug 937706

Ubuntu 11.10 crashes on an almost daily basis, and I'm doing various different things when it does so, so I can't easily identify what's to blame. Sometimes it happens when I'm in Firefox, sometimes Thunderbird, sometimes in a Virtualbox machine running Windows Xp. But it always happens the same way: it goes instantaneously to the black screen of death (which looks like a logout) and thence to the login screen.

My Xorg.0.log.old has the following entries at the end of the log after every crash:

[ 1214.793] Segmentation fault at address 0xb2536008
[ 1214.793]
Caught signal 11 (Segmentation fault). Server aborting
[ 1214.793]
Please consult the The X.Org Foundation support
  at http://wiki.x.org
 for help.
[ 1214.793] Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[ 1214.793]
[ 1214.794] (II) Power Button: Close
[ 1214.794] (II) UnloadModule: "evdev"
[ 1214.794] (II) Unloading evdev
[ 1214.796] (II) Power Button: Close
[ 1214.796] (II) UnloadModule: "evdev"
[ 1214.796] (II) Unloading evdev
[ 1214.800] (II) MOSART Semi. 2.4G Keyboard Mouse: Close
[ 1214.800] (II) UnloadModule: "evdev"
[ 1214.800] (II) Unloading evdev
[ 1214.804] (II) MOSART Semi. 2.4G Keyboard Mouse: Close
[ 1214.804] (II) UnloadModule: "evdev"
[ 1214.804] (II) Unloading evdev
[ 1214.805] (II) UnloadModule: "wacom"
[ 1214.805] (II) Unloading wacom
[ 1214.805] (II) UnloadModule: "wacom"
[ 1214.805] (II) Unloading wacom
[ 1214.812] (II) UnloadModule: "wacom"
[ 1214.812] (II) Unloading wacom
[ 1214.812] (II) AIGLX: Suspending AIGLX clients for VT switch
[ 1214.875] ddxSigGiveUp: Closing log

I have no idea if it's helpful, but my ~.xsession-errors has a lot of these errors:

     WARN 2012-02-21 11:03:27 glib.glib-gobject <unknown>:0 instance of invalid non-instantiatable type `(null)'

and a lot of these:

     WARN 2012-02-21 10:12:05 glib <unknown>:0 Unable to fetch children: Method "Children" with signature "" on interface "org.ayatana.bamf.view" doesn't exist

I'm happy to give more info, but I'd need guidance as to what's relevant.