Public bug reported:
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.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: Incomplete
** Tags: precise
** Attachment added: "kern.log"
https://bugs.launchpad.net/bugs/1306955/+attachment/4081867/+files/kern.log
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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
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