Xen users - Jun 2013 - Problem: xend.log says "VM restarting too fast. Refusing to restart to avoid loops"

Hi all,
one of my servers crashed last sunday just right after a startup and I need
to understand what was going on.
I am running Windows 2008 R2 Standard Edition on Oracle VM 3.1 - Xen
4.1.2-OVM

On sunday a scheduled task shutted down cleanly the vm.
the shutdown started at Sun Jun 16 10:00:33  and it ended at 2013-06-16
10:00:46.938.
xend.log says:

[2013-06-16 10:00:45 7228] INFO (XendDomainInfo:2148) Domain has shutdown:
name=0004fb00000600008f562ccf5ed488f8 id=6 reason=poweroff.

So far, so good

The same virtual machine has been started on Sun Jun 16 10:01:55 .
xend.logs says
[2013-06-16 10:01:56 7228] DEBUG (XendDomainInfo:106)
XendDomainInfo.create([''vm'', [''name'',
''0004fb00000600008f562ccf5ed488f8''],
[''memory'', 1536], [''maxmem'', 1536], ...
...
[2013-06-16 10:01:57 7228] INFO (XendDomain:1225) Domain
0004fb00000600008f562ccf5ed488f8 (7) unpaused.

once again so far so good

After less than one minute xend.log says

[2013-06-16 10:02:54 7228] WARNING (XendDomainInfo:2131) Domain has
crashed: name=0004fb00000600008f562ccf5ed488f8 id=7.
[2013-06-16 10:02:54 7228] ERROR (XendDomainInfo:2265) VM
0004fb00000600008f562ccf5ed488f8 restarting too fast (Elapsed time:
57.838376 seconds). Refusing to restart to
 avoid loops.
[2013-06-16 10:02:54 7228] DEBUG (XendDomainInfo:3145)
XendDomainInfo.destroy: domid=7
[2013-06-16 10:02:55 7228] DEBUG (XendDomainInfo:2473) Destroying device
model
[2013-06-16 10:02:55 7228] INFO (image:612)
0004fb00000600008f562ccf5ed488f8 device model terminated
[2013-06-16 10:02:55 7228] DEBUG (XendDomainInfo:2480) Releasing devices

WHAT !?!?!
What does "VM restarting too fast" mean?

Thanks for every answer
Regards
Andrea


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On Wed, 2013-06-19 at 18:37 +0200, Andrea Monti wrote:
> I am running Windows 2008 R2 Standard Edition on Oracle VM 3.1 - Xen
> 4.1.2-OVM
You should probably contact OVM support.
> After less than one minute xend.log says
> 
> [2013-06-16 10:02:54 7228] WARNING (XendDomainInfo:2131) Domain has
crashed: name=0004fb00000600008f562ccf5ed488f8 id=7.
> [2013-06-16 10:02:54 7228] ERROR (XendDomainInfo:2265) VM
0004fb00000600008f562ccf5ed488f8 restarting too fast (Elapsed time: 57.838376
seconds). Refusing to restart to
>  avoid loops.
> [2013-06-16 10:02:54 7228] DEBUG (XendDomainInfo:3145)
XendDomainInfo.destroy: domid=7
> [2013-06-16 10:02:55 7228] DEBUG (XendDomainInfo:2473) Destroying device
model
> [2013-06-16 10:02:55 7228] INFO (image:612)
0004fb00000600008f562ccf5ed488f8 device model terminated
> [2013-06-16 10:02:55 7228] DEBUG (XendDomainInfo:2480) Releasing devices
> 
> 
> WHAT !?!?!
> 
> What does "VM restarting too fast" mean? 
The domain keeps crashing. Xend will retry it a few times but will
eventually give up rather than just keep banging its head against the
wall.

Unfortunately there is no clue as to the reason for the crash in the
logs etc which you have shown here. Perhaps there was something a bit
earlier in the log?

Otherwise you could try adding ''on_crash =
"preserve"'' to your domain
configuration and see if that lets you see anything e.g. on the VNC etc.
You should also check all the files under /var/log/xen and the xen dmesg
("xm dmesg") for clues. The OVM support guys can likely also direct
you
on OVM specific places to look etc.

Ian.

On Tue, Jun 25, 2013 at 10:03:38AM +0100, Ian Campbell
wrote:
> On Wed, 2013-06-19 at 18:37 +0200, Andrea Monti wrote:
> 
> > I am running Windows 2008 R2 Standard Edition on Oracle VM 3.1 - Xen
> > 4.1.2-OVM
> 
> You should probably contact OVM support.
Yes please.
> 
> > After less than one minute xend.log says
> > 
> > [2013-06-16 10:02:54 7228] WARNING (XendDomainInfo:2131) Domain has
crashed: name=0004fb00000600008f562ccf5ed488f8 id=7.
> > [2013-06-16 10:02:54 7228] ERROR (XendDomainInfo:2265) VM
0004fb00000600008f562ccf5ed488f8 restarting too fast (Elapsed time: 57.838376
seconds). Refusing to restart to
> >  avoid loops.
> > [2013-06-16 10:02:54 7228] DEBUG (XendDomainInfo:3145)
XendDomainInfo.destroy: domid=7
> > [2013-06-16 10:02:55 7228] DEBUG (XendDomainInfo:2473) Destroying
device model
> > [2013-06-16 10:02:55 7228] INFO (image:612)
0004fb00000600008f562ccf5ed488f8 device model terminated
> > [2013-06-16 10:02:55 7228] DEBUG (XendDomainInfo:2480) Releasing
devices
> > 
> > 
> > WHAT !?!?!
> > 
> > What does "VM restarting too fast" mean? 
> 
> The domain keeps crashing. Xend will retry it a few times but will
> eventually give up rather than just keep banging its head against the
> wall.
> 
> Unfortunately there is no clue as to the reason for the crash in the
> logs etc which you have shown here. Perhaps there was something a bit
> earlier in the log?
> 
> Otherwise you could try adding ''on_crash =
"preserve"'' to your domain
> configuration and see if that lets you see anything e.g. on the VNC etc.
> You should also check all the files under /var/log/xen and the xen dmesg
> ("xm dmesg") for clues. The OVM support guys can likely also
direct you
> on OVM specific places to look etc.
Correct. Please do open a ticket with them.
> 
> Ian.
> 
>