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divine 30th November 2009 16:07

dom0 rebooting without any reason

I have some kind of problem with my xen server.
Here is some basic info:
cat /proc/version
Linux version 2.6.26-2-xen-686 (Debian 2.6.26-17lenny2) (
4gb ram
xeon 2ghz

two domus: with 2048 and 256 of memory.

Now, every two hours or so dom0 reboots without any reason, no log messages, nothing. If i stop xend (xend stop) then server works without any reboots perfectly. Please help me to identify problem, i know it is difficult because i have no information what can cause it. Hardware was tested throughtly for two weeks - everything is perfect.
It works without any gliches with xend started too except rebooting 'thing'.
Is there any way to 'catch dump' when that happens? (unfortunately kernel has no errors too)


falko 1st December 2009 19:05

Did you check the logs on the host and the guests?

divine 1st December 2009 21:07


Logs capture nothing...
So what i have got:
1. xend stop = no reboots everything is working
2. xend start = hangs every 2-3 hours randomly
3. xend start but with no domus running = hadn't crashed yet (about one full day).

my guess is RAM but i changed them, i don't know even how many times...

falko 2nd December 2009 17:49

That's really strange. Unfortunately I have no idea what could cause this... :(

glycerin 31st March 2010 12:15

dom0 rebooting unexpectedly
Hi ..I have the same problem. The dom0 restart without any reason and no log available. It seems that all is ok but I can understand why these reboots random.
Did you find any solution?
I've updated the kernel release but nothing to do. All is strange and also I cannot release the VM for production use.
Any help?
Thanks glycerin

divine 31st March 2010 16:17

Hi there,

I researched this problem for a whole year and never found anything.
But i have my own conclusions anyway.
What i did:
1. changed ram etc..
2. tested everything with everything possible
3. observations:
a) hanging occurs when clustered servers are put together
b) though it is very little possibility, but my conclusion is that somehow xen kernel+ glusterfs (sync) played a big role in this hanging. I played with various kernels and got to the point when only one server hangs constantly but other is ok.

(now i just have drbd+xen, running without problems atm)

Could you please write all the software you are using?

glycerin 31st March 2010 17:06

Hi. Actually I'm using simpply the hypervisor only with 4 VM but only for testing.
Now we decided to reinstall the server because at first attempt I've compiled Xen and the xen-tools. In a second step I've decided to use the debian package and may be this approach has done something wrong in the hypervisor. These are only some hint to understand what's happening.

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