Pkg xen devel - Mar 2011 - Bug#617421: xen-hypervisor-4.0-i386: can't migrate (or save/resume) lenny guests: BUG: recent printk recursion

Package: xen-hypervisor-4.0-i386
Version: 4.0.1-2
Severity: normal

Hi,

Take the following config file (standard lenny kernel and initrd, with
some customization for iSCSI root):

name = "lenny3"
kernel = "vmlinuz-2.6.26-2-686-bigmem"
ramdisk = "initrd.img-2.6.26-2-686-bigmem"
memory = 100
vcpus = 1
vif = [ 'mac=00:16:3e:00:00:17, bridge=br695, vifname=lenny3.alma-g' ]
extra = "break=top"
on_poweroff = 'destroy'
on_reboot   = 'restart'
on_crash    = 'restart'

Start the domain:

xm create -c lenny3.conf
[...]
(initramfs)

On 03/09/2011 03:41 AM, Ferenc Wagner wrote:
> Hi,
> 
> Take the following config file (standard lenny kernel and initrd, with
> some customization for iSCSI root):
> 
> name = "lenny3"
> kernel = "vmlinuz-2.6.26-2-686-bigmem"
> ramdisk = "initrd.img-2.6.26-2-686-bigmem"
> memory = 100
> vcpus = 1
> vif = [ 'mac=00:16:3e:00:00:17, bridge=br695,
vifname=lenny3.alma-g' ]
> extra = "break=top"
> on_poweroff = 'destroy'
> on_reboot   = 'restart'
> on_crash    = 'restart'
> 
> Start the domain:
> 
> xm create -c lenny3.conf
> [...]
> (initramfs)
> 
>>From another terminal, save the guest:
> 
> xm save lenny3 /tmp/lenny3.save
> 
> The guest console says: Suspending xenbus... and detaches.
> 
> Restore the guest (paused to attach its console before continuing):
> 
> xm restore -p /tmp/lenny3.save
> xm console lenny3
> xm unpause lenny3
> 
> The console starts spewing out "BUG: recent printk recursion" and
the
> domain spins until destroyed.  The same thing happens on (live or not)
> migration.  The very same domains could be migrated without issues under
> Xen 3.2 (more precisely, before I upgraded my dom0 to squeeze --
> previously it was running lenny with the etch dom0 kernel for stability).
> 
> Migrating squeeze guests isn't a problem in the same setup (just
replace
> 26-2 with 32-5 in the above config).
> 
> This looks like a regression.  On the other hand, it doesn't seem to
> affect a lot of people, because I couldn't find anything relevant on
the
> web.  Please tell me if I can help debugging the issue further.
Kernel 2.6.26 are designed for Xen 3, and 2.6.32 are for Xen 4. I'm not
really surprised with the result you have here, and I don't think you
can expect to have it fixed. Why don't you simply use kernel 2.6.32 for
your Lenny VMs? It does work well, even with a Lenny userland.

Thomas

Your message dated Wed, 9 Mar 2011 13:05:40 +0100
with message-id <20110309120540.GA2446 at wavehammer.waldi.eu.org>
and subject line Re: [Pkg-xen-devel] Bug#617421: Bug#617421: Bug#617421:
xen-hypervisor-4.0-i386: can't migrate (or save/resume) lenny guests: BUG:
recent printk recursion
has caused the Debian Bug report #617421,
regarding xen-hypervisor-4.0-i386: can't migrate (or save/resume) lenny
guests: BUG: recent printk recursion
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner at bugs.debian.org
immediately.)


-- 
617421: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=617421
Debian Bug Tracking System
Contact owner at bugs.debian.org with problems
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From: Ferenc Wagner <wferi at niif.hu>
Subject: xen-hypervisor-4.0-i386: can't migrate (or save/resume) lenny
guests: BUG: recent printk recursion
Date: Tue, 08 Mar 2011 20:41:41 +0100
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