[Pkg-xen-devel] no kernel events on domU creation/failed multicalls

[Ferenc Wagner]

(This is a resend of my earlier message which may still be awaiting
moderator approval for size reasons.  Please Cc me on replies.)

Hi,

I'm not sure this is the right forum for messages like this, please
redirect me if not.  Please also Cc me in either case.

Last week I upgraded my Xen HA setup (two hosts) to sqeeze.  The upgrade
itself was smooth, thanks for the nice work!  Also the virtual machines
started without a hitch on the host I upgraded first.  A couple of days
later I upgraded the second host, again without any problem.  However, I
couldn't start any domU on it, but got the dreaded "hotplug scripts not
working" message.  In the end udevadm monitor revealed that there's not
a single event generated by domain creation, so the hotplug scripts
weren't invoked at all.  xm dmesg didn't show anything suspicious, dmesg
neither.  Eventually I rebooted the machine, which resulted in the logs
at http://apt.niif.hu/console.log (the serial logs were seriously
garbled due to lack of flow control, so this is a slightly touched-up
version of { xm demsg; dmesg } to provide some orientation).  Despite
the stack dumps, domain creation worked fine in the booted system,
udevadm monitor showed the expected activity.  Then I rebooted again,
which resulted in a final stack dump during shutdown (part of which was
unfortunately lost), then the system came up without a single error and
with domain creation still working.

I'm pretty uncertain about what to do now or how to gain deeper insight
should the problem reappear.  Ideas more than welcome.
-- 
Thanks,
Feri.