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Arbitrary Warmstarts!

Hi all,

one of my Linux servers (debian etch with Kernel 2.6.22-4-686 from backports.org) does arbitrary warmstarts (like one is pressing the reset switch).
I had the same symptom with the 2.6.18-6-686 kernel.
Can one tell me whether there are conditions under which linux performs a warmstart. I have not configured to reboot in case of a kernel-panic. Temperature of the CPU is normal. The FANs are working.
I checked logfiles, but did not find anything.
I also ran chkrootkit which did not find a problem.

The first reboot (warmstart) was on the 7'th of may. Until this date it worked perfectly for 3 1/2 years.

Did one have such a symptom?
Could it be that the machine is compromised?

Thanks in advance

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