On Fri, 27 Feb 2004, James Burton wrote:

> About 6 months ago I upgraded my desktop from 1.5 to 1.6.1
> and ever since then I have had regular lockups. The result is I
> can't get any sort of response from the machine and have to press the reset
> button. There are 2 sure-fire ways of causing this immediately.
>
> 1. start an XDMCP client pointed at it's xdm server (e.g. from my WinXP box run
> Cygwin/Xfree in XDMCP client mode)
>
> 2. access any web page with a CGI behind it hosted on Mr. Crashy's httpd.
>
> It will also periodially lock itself when I've looked at lots of photos
> from the web server or played a lot of mp3 over samba etc.
>
> Seems by behaviour to be related to network activity.
> This morning I upgraded to 1.6.2RC4 in vain hope of it going away.
> I've just run memtest for nearly 2 hours and found no memory probs.
> A few weeks ago I re-compiled a kernel with kernel debugger in
> and wasn't able to get it to drop into the debugger after the lockup.

To me, it sounds like heat. What kind of CPU is it? I would verify
that the chip fan is running, check the airflow in the case, maybe
re-apply the heatsink compound to the heatsink or replace the CPU.

Frederick