I have caught the similar (or even the same) problem once with 
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Linux version 3.0.0-12-generic (buildd@vernadsky) (gcc version 4.6.1 
(Ubuntu/Linaro 4.6.1-9ubuntu3) ) #20-Ubuntu SMP Fri Oct 7 14:50:42 UTC 2011 
(Ubuntu 3.0.0-12.20-generic 3.0.4)
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At that moment the USB flash disk was removed.

log attached

** Attachment added: "crash.log"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/922906/+attachment/3148168/+files/crash.log

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https://bugs.launchpad.net/bugs/922906

Title:
  Kernel Oops - BUG: unable to handle kernel NULL pointer dereference at
  0000009c; EIP is at __ticket_spin_lock+0x8/0x30

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