On 28 May, Matt M wrote:
>  Try testing the memory in the system -- use memtest86. Run through all the 
>  tests (takes about 24 hours on your average system), and see what it shows 
>  up. Memory's always the first thing I test when I start seeing `random' 
>  instability in a system.

Okay, I'll reserve some time on the weekend to try that.  I've
downloaded, compiled and installed version 3.0 and added it in as a
boot image in lilo.

The system rebooted this morning at 4:02 am, just as it did the day
before, give or take a few seconds.  At 4:05am there's a scheduled
backup, but nothing else nearby that I'm aware of.  What time does the
RH cron.daily script get run?

There was also a system lock-up around noon by my wife, and just now by
me, while I was reading Matt's message.  We were both logged in, so
memory use would have been moderately high.

These system lock-ups are different to the unattended ones - for those
the system reboots, but when it locks up while we're using it, the
system just stays hung.  I guess the new monitor is turned on at those
times, turned off when it's unattended.

Jan Schmidt wrote:

> As I said, I was using the cpuburn package, which runs tight assembler loops
> to heat CPUs up. With the dodgy PSU and the standard CPU core voltage, it
> would just hard lock within 10 seconds. After the PSU upgrade, I ran it for
> 8 hours and got the CPU up to 55C
> 
> Other symptoms were programs randomly segfaulting, particularly video
> encoding and other such CPU intensive apps.

Hmm.  All very strange.  I guess I have a few avenues to explore,
anyway.  I'll let you all know how I get on.

luke

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