While it may feel like an Xorg freeze, actually from your logs I'm not
seeing anything that indicates X is complicit. Retargeting to the
kernel.
sock_aio_read() sounds like it might be happening in some asynchronous
I/O. However, the dmesg you posted only starts at 19199 sec, so might
be missing some pertinent information. I would suggest reproducing it
again and collecting dmesg quickly after the problem starts, so it show
the period both before and after the fault started.
** Package changed: xserver-xorg-video-ati (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/917668
Title:
system freeze ("hard LOCKUP"), warn_slowpath_common+0x7f in
sock_aio_read
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