** Attachment added: "dmesg.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1306955/+attachment/4081871/+files/dmesg.log
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1306955/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
