Upon trying to reproduce on RC4, I was able to capture attached kernel
panic. The symptom could be triggered within a short amount of time.

re comment #27:
--->---
It sounds like we've concluded the following:

v3.10 final: good
v3.11 rc1: bad
v3.11-rc4: good
v3.11-rc5: bad
---<--- 

comment #20 reports rc4 to lock up eventually, while I wasn't seeing an
issue with rc4 in comment #11 & #26, but just have verified twice that
rc4 crashes (comment #30). With that I think we should disregard comment
#11 & #26 and also mark rc4 as bad. As per comment #28, v3.11 final also
shows the symptom.

Conclusion: regression between v3.10 final and v.3.11 rc1, will try to
double check v.3.10 final now


** Attachment added: "IMG_20130904_143750.jpg"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1214931/+attachment/3802997/+files/IMG_20130904_143750.jpg

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Title:
  kernel oops in free_task

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