Comment 124 for bug 108527

Seeing this as well on non ATI machines. (AMD64, NVidia).
Xorg freezes (seemingly randomly), always in the same place in the kernel:

[ 1871.080030] Xorg D ffff810037930540 0 5246 5241 (NOTLB)
[ 1871.080034] ffff81002c33fe68 0000000000000082 0000000000000000 ffff81002e8c7000
[ 1871.080037] ffff81002c33fc78 0000000000000000 ffff8100379a14a0 ffffffff8052d3c0
[ 1871.080041] 0000000000010d5e ffff8100379a1650 0000000000000292 00000001000b7425
[ 1871.080044] Call Trace:
[ 1871.080066] [<ffffffff8803981c>] :usbcore:usb_hcd_unlink_urb+0x18c/0x1b0
[ 1871.080080] [<ffffffff8803a54a>] :usbcore:usb_kill_urb+0xba/0x110
[ 1871.080085] [<ffffffff8024b2b0>] autoremove_wake_function+0x0/0x30
[ 1871.080091] [<ffffffff8039dc31>] input_close_device+0x51/0x70
[ 1871.080096] [<ffffffff803a0729>] mousedev_release+0xc9/0x130
[ 1871.080100] [<ffffffff8029a3f1>] __fput+0xc1/0x1e0
[ 1871.080107] [<ffffffff80297364>] filp_close+0x54/0x90
[ 1871.080111] [<ffffffff80298ae6>] sys_close+0x96/0xf0
[ 1871.080115] [<ffffffff80209e8e>] system_call+0x7e/0x83