Re: [Xen-users] intermittent domU issue: related to udev?

[Eric Lenio <eric@xxxxxxxxx>]

On Wed, May 13, 2009 at 08:47:55PM +0100, Iain J. Watson wrote:
> On Sun, Apr 19, 2009 at 3:31 PM, Eric Lenio <eric@xxxxxxxxx> wrote:
> > Hello list.  My server:
> >
> > Gentoo 2.6.21-xen dom0
> > xen-tools 3.2.1
> > lvm 2.02.28-r2
> > udev-115-r1
> >
> >
> > Symptoms: normally I run 4 domUs.  About once a week I have a need to
> > restart a domU.  Sometimes it works just fine, but other times it does not
> > and I'll get a message back saying "Error: Device 0 (vif) could not be
> > connected. Hotplug scripts not working".  The domU config file has not been
> > changed so I'm fairly certain it is configured properly.  I think it comes
> > down to the domU not being able to "talk" with udevd.  I know udevd is
> > still running and is responsive (if I run udevmonitor and mount/umount a
> > disk I see normal output).  When I attempt to start my domU I normally see
> > udevmonitor output like this:
> >
> > UEVENT[1240149226.992189] add      /devices/xen-backend/vbd-9-2048 
> > (xen-backend)
> > UDEV  [1240149226.993163] add      /devices/xen-backend/vbd-9-2048 
> > (xen-backend)
> > UEVENT[1240149227.012202] add      /devices/xen-backend/vbd-9-2064 
> > (xen-backend)
> > UDEV  [1240149227.013301] add      /devices/xen-backend/vbd-9-2064 
> > (xen-backend)
> > UEVENT[1240149227.045410] add      /devices/xen-backend/vif-9-0 
> > (xen-backend)
> > UDEV  [1240149227.048638] add      /devices/xen-backend/vif-9-0 
> > (xen-backend)
> > UEVENT[1240149227.051320] add      /devices/virtual/net/vif9.0 (net)
> > UEVENT[1240149227.051805] online   /devices/xen-backend/vif-9-0 
> > (xen-backend)
> > UDEV  [1240149227.054369] online   /devices/xen-backend/vif-9-0 
> > (xen-backend)
> > UDEV  [1240149227.062738] add      /devices/virtual/net/vif9.0 (net)
> > UEVENT[1240149227.108918] add      /devices/xen-backend/console-9-0 
> > (xen-backend)
> > UDEV  [1240149227.110112] add      /devices/xen-backend/console-9-0 
> > (xen-backend)
> >
> >
> > But when the issue happens I see no udevmonitor output.  Restarting udevd
> > did not help.  The problem does not seem specific to any particular domU --
> > once the condition happens, none of the domUs will restart.  My only
> > solution so far has been to restart dom0.  Suggestions?
> >
> 
> I am having a similar problem. I don't know about the complete lack of udevd
> activity as I didn't know about that command but I'll be checking tomorrow.
> 
> Did you have any luck chasing this problem down?
> 
> Regards,
> Iain Watson

No I haven't figured it out... the problem hasn't happened since my last post
but if history repeats itself it should happen any day now.  Would be happy to
work with you to try to identify a resolution (other than rebooting!).

Eric.

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