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[Pieter van Erp <pverp@xxxxxxxxx>]

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

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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