This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:
apport-collect 1306955
and then change the status of the bug to 'Confirmed'.
If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.
This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Tags added: precise
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https://bugs.launchpad.net/bugs/1306955
Title:
Kernel Oops - unable to handle kernel NULL pointer dereference; EIP is
at free_thread_info+0xb/0x30
Status in “linux” package in Ubuntu:
Incomplete
Bug description:
Since upgrading from 10.04 to 12.04, my server suffers from frequent
freezes. I have been unable to find a pattern and the freeze
'behaviour' is not always the same: usually the system does not
respond at all anymore, and sometimes an error message is printed to
the console:
BUG: unable to handle kernel NULL pointer dereference at (null)
free_thread_info+0xb/0x30
The attached kern.log file has the full error messages.
Usually the system can reboot using Alt+SysReq+B, but sometimes that
doesn't even work. And on rare occasions the keyboard lights start
blinking.
Now, there might be more than 1 problem at hand here, but at least
I've got an error message now.
PS: on 10.04 I also had occasional freezes, but that averaged once
every 3 months or so. Now it happens once every three days.
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