many crashes of X server, what should I investigate?

[Frédéric Bron]

It just froze again after user switch. I could connect from another
computer via ssh.
What happens is that the X server is taking 100% of CPU while doing
nothing. Here is the result of top:

top - 10:24:48 up  2:23,  5 users,  load average: 0.96, 0.63, 0.44
Tasks: 296 total,   2 running, 294 sleeping,   0 stopped,   0 zombie
Cpu(s): 12.6%us,  0.0%sy,  0.0%ni, 87.2%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:  16412940k total,  4394816k used, 12018124k free,   353460k buffers
Swap: 20971516k total,        0k used, 20971516k free,  1703748k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 2509 root      20   0  197m  81m  20m R 100.1  0.5   3:39.16 X

Here is the end of dmesg (full log attached):

[    9.767452] RPC: Registered tcp NFSv4.1 backchannel transport module.
[   11.095246] NVRM: Your system is not currently configured to drive
a VGA console
[   11.095249] NVRM: on the primary VGA device. The NVIDIA Linux graphics driver
[   11.095250] NVRM: requires the use of a text-mode VGA console. Use
of other console
[   11.095251] NVRM: drivers including, but not limited to, vesafb,
may result in
[   11.095252] NVRM: corruption and stability problems, and is not supported.
[   11.272563] jme 0000:03:00.0: p1p1: Link is up at ANed: 100 Mbps,
Full-Duplex, MDI-X
[   12.163589] IPv6: ADDRCONF(NETDEV_CHANGE): p1p1: link becomes ready
[   18.928156] fuse init (API version 7.20)
[   18.937985] SELinux: initialized (dev fuse, type fuse), uses genfs_contexts
[   18.958490] SELinux: initialized (dev fusectl, type fusectl), uses
genfs_contexts
[  397.734049] TCP: lp registered
[  807.384111] SELinux: initialized (dev fuse, type fuse), uses genfs_contexts
[  900.445624] usb 2-1.2: usbfs: interface 1 claimed by usblp while
'xsane' sets config #1
[  911.880596] usb 2-1.2: usbfs: interface 1 claimed by usblp while
'xsane' sets config #1
[ 1514.963116] SELinux: initialized (dev fuse, type fuse), uses genfs_contexts
[ 5379.310344] nepomukservices[4370]: segfault at 0 ip
(null) sp 00007fff23a794e8 error 14 in nepomukservicestub[400000+7000]
[ 8423.252973] usb 2-1.2: usbfs: interface 0 claimed by usbfs while
'xsane' sets config #1
[ 8428.030674] usb 2-1.2: usbfs: interface 0 claimed by usbfs while
'xsane' sets config #1
[ 8481.203974] NVRM: GPU at 0000:01:00: GPU-a26ca184-dbb8-cb76-a255-3c1db789ce86
[ 8481.203978] NVRM: Xid (0000:01:00): 38, 0002 0000902d 00000000
00000000 00000100 00000000
[ 8483.259787] NVRM: os_schedule: Attempted to yield the CPU while in
atomic or interrupt context
[ 8485.256822] NVRM: os_schedule: Attempted to yield the CPU while in
atomic or interrupt context
[ 8486.657367] NVRM: Xid (0000:01:00): 38, 0002 00000000 00000000
00000000 00000000 00000000
[ 8488.098020] NVRM: Xid (0000:01:00): 38, 0000 00000000 00000000
00000000 00000000 00000000

Does this help?
Frédéric
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