Re: [Xen-devel] pv 2.6.31 (kernel.org) and save/migrate, domU BUG()

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sun, Nov 08, 2009 at 05:41:53PM +0200, Pasi Kärkkäinen wrote:
> On Sun, Nov 08, 2009 at 07:29:58AM -0800, Dan Magenheimer wrote:
> > > > > > machine and it fails to save also.  Are you able to save
> > > > > > 2.6.31{,.5} successfully?  On latest xen-unstable?
> > > > > > (NOTE: Yes, I do have CONFIG_XEN_SAVE_RESTORE=y... don't
> > > > > > know if that is important.)
> > > 
> > > Ok. I just tried with a Fedora 12 (rawhide) PV guest. I was able to 
> > > "xm save" and "xm restore" it without problems. 
> > > 
> > > But I noticed there was a BUG printed on the guest console:
> > > http://pasik.reaktio.net/xen/debug/dmesg-2.6.31.5-122.fc12.x86
> > > _64-saverestore.txt
> > > BUG: sleeping function called from invalid context at 
> > > kernel/mutex.c:94
> > > in_atomic(): 0, irqs_disabled(): 1, pid: 1052, name: kstop/0
> > > Pid: 1052, comm: kstop/0 Not tainted 2.6.31.5-122.fc12.x86_64 #1
> > 
> > Ok, so it appears there is something problematic with
> > saving an upstream kernel.  It might be (partially) fixed
> > in Fedora 12 or maybe there is some other environmental
> > difference which makes save fail entirely on my system.
> > 
> 
> Yeah, fedora kernel has some patches, but it should be pretty 
> close to upstream kernel..
> 
> btw was your guest UP or SMP? Mine was UP..
> 

Ok.. saving SMP guest fails for me too:

[2009-11-09 23:44:38 1353] DEBUG (XendCheckpoint:110) [xc_save]: 
/usr/lib64/xen/bin/xc_save 28 2 0 0 0
[2009-11-09 23:44:38 1353] INFO (XendCheckpoint:417) xc_save: failed to get the 
suspend evtchn port

Jeremy: Ideas what's causing that? "xm save" for UP 2.6.31.5 guest works
OK, but for SMP guest it fails with the error above.

-- Pasi


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