Comment 13 for bug 316566

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max (mikhmv) wrote : Re: xorg freeze randomly

I used this:
When the crash occurs, press Alt+SysRq+1 (one, not L) followed by Alt+SysRq+t. If using a text console, you should see a trace dumped to the screen. If the system is sufficiently alive, it will also be logged to /var/log/kern.log and visible in the output from dmesg.

In this time xserver was completely frozen (mouse disappear). After this keys I used Cntrl-Alt-Del.
in attached file fragment of kern.log for current run.