Xen users - Apr 2006 - DomU Shutdown Timeout, Zombies Hanging a Reboot

Hello,

I am using Xen 3.0.2/2.6.16-xen on Gentoo 2006.0.  I am getting the
following in my Xen logs when I attempt to shut down a domU:

---
[2006-04-17 09:41:39 xend] DEBUG (DevController:132) Waiting for devices
vtpm.
[2006-04-17 09:41:40 xend] INFO (XendDomain:363) Domain lists.test.ca
(1) unpaused.
[2006-04-17 09:44:33 xend.XendDomainInfo] DEBUG (XendDomainInfo:877)
XendDomainInfo.handleShutdownWatch
[2006-04-17 09:44:33 xend.XendDomainInfo] DEBUG (XendDomainInfo:877)
XendDomainInfo.handleShutdownWatch
[2006-04-17 09:45:03 xend.XendDomainInfo] INFO (XendDomainInfo:867)
Domain shutdown timeout expired: name=lists.test.ca id=1
[2006-04-17 09:45:03 xend.XendDomainInfo] DEBUG (XendDomainInfo:1327)
XendDomainInfo.destroy: domid=1
[2006-04-17 09:45:03 xend.XendDomainInfo] DEBUG (XendDomainInfo:1335)
XendDomainInfo.destroyDomain(1)
---

QUESTION 1: Is the only way to increase the "Domain shutdown timeout"
by
changing python source code?  Is this configurable?

Possibly because of this timeout forcing a shutdown of the domain too
early, that domain will turn into a zombie.  (But it may be something
else causing the Zombie... not sure.)

# xm list
Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0      128     1 r-----   146.4
Zombie-lists.test.ca           1      192     1 -----d    63.2

And when I try to shutdown/reboot the server via dom0 in this state, it
will hang.  I''ve determined that the offending line in the Gentoo xen
init/shutdown script is: ''/usr/sbin/xm shutdown --all --wait
>/dev/null''

And when I run this on the command line it will hang, waiting to kill
the Zombie it would seem-- but it never kills it.

QUESTION 2: How can I shut down or reboot my server cleanly if there are
zombies?

Thank you,
James

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On Mon, 17 Apr 2006 10:13:25 -0600
Jim Henderson <his_jimboness@yahoo.ca> wrote:

> QUESTION 1: Is the only way to increase the "Domain shutdown
timeout"
> by changing python source code?  Is this configurable?
- From reading the source code, I''d say yes. 
You can find the value
in /usr/lib/python2.4/site-packages/xen/xend/XendDomainInfo.py, line 86
(Xen 3.0.2), in case you haven''t seen yet. 
> And when I try to shutdown/reboot the server via dom0 in this state,
> it will hang.  I''ve determined that the offending line in the
Gentoo
> xen init/shutdown script is: ''/usr/sbin/xm shutdown --all --wait
> >/dev/null''
> 
> And when I run this on the command line it will hang, waiting to kill
> the Zombie it would seem-- but it never kills it.
> 
> QUESTION 2: How can I shut down or reboot my server cleanly if there
> are zombies?
You should be able to destroy the zombies (xm destroy) shutting down.
Alternatively, you could also use different init scripts, ofc. 

Maybe xm should be changed to not wait for zombies?

Regards, 
Milan


- -- 
Milan Holzaepfel <mail(a)mjh(d)name>            
<URL:http://mjh.name/>
pub  4096R/C790FC23  EB8E 5E81 81E3 53A9 9B74  B895 5179 54C0 C790 FC23 

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