I got this similar looking oops from running GDB on feisty (2.6.20-2-generic).
** Attachment added: "crash in __getblk" http://librarian.launchpad.net/5493529/oops -- gdb makes kernel oups https://launchpad.net/bugs/76419 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
