Comment 40 for bug 270798

I have the same problem here too, Thinkpad T500, T9550, 9.04 x64.
Caps lock LED is flashing when it happens.

Jun 27 23:51:29 t500 kernel: [ 1942.540712] CE: hpet increasing min_delta_ns to 15000 nsec
Jun 27 23:51:30 t500 kernel: [ 1942.972710] CE: hpet increasing min_delta_ns to 22500 nsec
Jun 27 23:51:30 t500 kernel: [ 1942.972887] CE: hpet increasing min_delta_ns to 33750 nsec
Jun 27 23:52:54 t500 kernel: [ 2027.652690] CE: hpet increasing min_delta_ns to 50624 nsec

I thought I traced it to the Adobe 10 flash player:

Jun 27 22:29:57 t500 kernel: [ 152.563328] npviewer.bin[4113] general protection ip:f019d805 sp:fff51450 error:0 in libmurrine.so[f018e000+20000]
Jun 27 22:30:11 t500 kernel: [ 166.980410] npviewer.bin[4140]: segfault at 6aac7340 ip 00000000f3c9a039 sp 00000000fff357ec error 4 in libmurrine.so[f3$
Jun 27 22:30:11 t500 kernel: [ 167.473236] npviewer.bin[4314] general protection ip:f3ca0031 sp:fff0b7bc error:0 in libmurrine.so[f3c90000+20000]
Jun 27 22:31:35 t500 kernel: [ 250.704657] general protection fault: 0000 [#1] SMP
Jun 27 22:31:35 t500 kernel: [ 250.704667] last sysfs file: /sys/devices/pci0000:00/0000:00:1c.1/0000:03:00.0/rfkill/rfkill2/state
Jun 27 22:31:35 t500 kernel: [ 250.704674] Dumping ftrace buffer:
Jun 27 22:31:35 t500 kernel: [ 250.704679] (ftrace buffer empty)
Jun 27 22:31:35 t500 kernel: [ 250.704683] CPU 1
Jun 27 22:31:35 t500 kernel: [ 250.704686] Modules linked in: binfmt_misc ppdev bridge stp bnep input_polldev joydev lp parport snd_hda_intel snd_pcm_o$
Jun 27 22:31:35 t500 kernel: [ 250.704794] Pid: 4330, comm: npviewer.bin Tainted: P 2.6.28-13-generic #44-Ubuntu
Jun 27 22:31:35 t500 kernel: [ 250.704799] RIP: 0010:[<ffffffff802e236c>] [<ffffffff802e236c>] kmem_cache_alloc+0x5c/0xc0
Jun 27 22:31:35 t500 kernel: [ 250.704814] RSP: 0018:ffff880118c93d48 EFLAGS: 00010082

But I still had the lockup even with that player removed.