[Gllug] Mysterious reboots

Tue Apr 4 11:53:19 UTC 2006

Hello.

I hope someone here has some idea of what the problem with my computer 
is, I have no idea.

I have a new machine at work (AMD Athlon(tm) 64 Processor 3200+, 2Gb 
dual channel memory).  It was working fine for a few weeks but now I 
have a really big problem.  Seemingly at random the machine hangs for 
about 10 seconds (frozen display) then reboots (not a graceful reboot, 
just back to the BIOS).  Sometimes it goes for hours without this 
happening (it stayed up all last weekend), and sometimes it will reboot 
frequently (10 times yesterday).

As I mentioned, it was working fine.  Some things I had considered might 
have contributed to the problem, ie. the machine was fine before I did 
these things:

1) I upgraded to FC5 from FC5 test3
2) I moved /home from /dev/hda<something> to a software raid mirror 
consisting of /dev/sda2 (SATA) and /dev/hda1

I have now reversed 2) and he machine has since crashed/rebooted.

Also I have also considered the following possible causes:

1) Overheating?: however lm_sensors indicates the temperatures in the 
case/CPU to be a fairly constant 32 deg/c
2) Lack of power?: reboots have happened during prolonged periods of CPU 
idleness and the machine only has a low-spec gfx card and two HD's in, 
the 400Watt power supply should be able to cope.
3) The power in the building could be crap: however no-one else in the 
building seems to have these problems
4) My power supply may have developed a fault.

A colleague has a machine with the same CPU and two HD's in it and has 
had no problems (although he is running 32bit windowsXP), and no-one 
else in the building is reporting problems.

The last reboot I had was about 12:00 midday, the one before that about 
6:00 PM last night.  Yesterday the machine rebooted about 10 times.

Can anyone suggest any things I should test for or what could be wrong? 
  It seems to me to be a hardware fault, but I could be wrong.  Has 
anyone else experienced these sort of problems?

This is the Motherboard I have, if it makes any difference:

http://www.microdirect.co.uk/ProductInfo.aspx?ProductID=10165&GroupID=1091

And here is /var/log/messages spanning the last reboot.  As you can see 
the last activity before the reboot was at 11:37:06 and there were no 
errors reported.

Apr  4 09:55:05 localhost dhclient: DHCPREQUEST on eth0 to 192.168.10.69 
port 67
Apr  4 09:55:05 localhost dhclient: DHCPACK from 192.168.10.69
Apr  4 09:55:05 localhost dhclient: bound to 192.168.10.220 -- renewal 
in 1441 seconds.
Apr  4 10:19:06 localhost dhclient: DHCPREQUEST on eth0 to 192.168.10.69 
port 67
Apr  4 10:19:06 localhost dhclient: DHCPACK from 192.168.10.69
Apr  4 10:19:06 localhost dhclient: bound to 192.168.10.220 -- renewal 
in 1376 seconds.
Apr  4 10:33:51 localhost avahi-daemon[2190]: Recieved repsonse with 
invalid source port 4576 on interface 'eth0.0'
Apr  4 10:42:02 localhost dhclient: DHCPREQUEST on eth0 to 192.168.10.69 
port 67
Apr  4 10:42:02 localhost dhclient: DHCPACK from 192.168.10.69
Apr  4 10:42:02 localhost dhclient: bound to 192.168.10.220 -- renewal 
in 1550 seconds.
Apr  4 11:07:52 localhost dhclient: DHCPREQUEST on eth0 to 192.168.10.69 
port 67
Apr  4 11:07:52 localhost dhclient: DHCPACK from 192.168.10.69
Apr  4 11:07:52 localhost dhclient: bound to 192.168.10.220 -- renewal 
in 1754 seconds.
Apr  4 11:37:06 localhost dhclient: DHCPREQUEST on eth0 to 192.168.10.69 
port 67
Apr  4 11:37:06 localhost dhclient: DHCPACK from 192.168.10.69
Apr  4 11:37:06 localhost dhclient: bound to 192.168.10.220 -- renewal 
in 1416 seconds.
Apr  4 11:57:00 localhost syslogd 1.4.1: restart.
Apr  4 11:57:00 localhost kernel: klogd 1.4.1, log source = /proc/kmsg 
started.
Apr  4 11:57:00 localhost kernel: Bootdata ok (command line is ro 
root=LABEL=/1 rhgb quiet)
Apr  4 11:57:00 localhost kernel: Linux version 2.6.16-1.2080_FC5 
(bhcompile at hs20-bc1-4.build.redhat.com) (gcc version 4.1.0 20060304 (Red 
Hat 4.1.0-3)) #1 SMP Tue Mar 28 03:38:47 EST 2006 Apr  4 11:57:00 
localhost kernel: BIOS-provided physical RAM map:
Apr  4 11:57:00 localhost kernel:  BIOS-e820: 0000000000000000 - 
000000000009ec00 (usable)
Apr  4 11:57:00 localhost kernel:  BIOS-e820: 000000000009ec00 - 
00000000000a0000 (reserved)
Apr  4 11:57:00 localhost kernel:  BIOS-e820: 00000000000e8000 - 
0000000000100000 (reserved)
Apr  4 11:57:00 localhost kernel:  BIOS-e820: 0000000000100000 - 
000000007ffb0000 (usable)
Apr  4 11:57:00 localhost kernel:  BIOS-e820: 000000007ffb0000 - 
000000007ffc0000 (ACPI data)

Thanks,
Will.
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