Pkg xen devel - Dec 2015 - Bug#808624: Invalid argument while starting daemon

Package: xen-hypervisor-4.4-amd64
Version:?4.4.1-9+deb8u3
Severity: important

I just upgraded a machine used for hosting a few VM with Xen. The
machine was running debian squeeze, so I updated to wheezy and then
jessie. Xen is now version 4.4, cpu is 64 bits, dom0 is 32 bits
userland with 64 bits kernel?3.16.0-4-amd64.

Grub correctly load Xen and dom-0, in fact:
# cd /sys/hypervisor/version; cat major minor extra
4
4
.1

During boot, Xen does not start. This is its status in systemd log:

# systemctl status xen.service
? xen.service - LSB: Xen daemons
???Loaded: loaded (/etc/init.d/xen)
???Active: failed (Result: timeout) since lun 2015-12-21 15:34:04 CET; 38min ago
? Process: 28167 ExecStart=/etc/init.d/xen start (code=killed, signal=TERM)

dic 21 15:29:04 centrum xenstored[28191]: Checking store ...
dic 21 15:29:04 centrum xenstored[28191]: Checking store complete.
dic 21 15:29:04 centrum xenstored[28191]: Checking store ...
dic 21 15:29:04 centrum xenstored[28191]: Checking store complete.
dic 21 15:29:04 centrum xen[28167]: Starting Xen daemons: xenstored xenconsoled
init-dom0FATAL: Failed to initialize dom0 state: Inappropriate ioctl for device
dic 21 15:34:04 centrum systemd[1]: xen.service start operation timed out.
Terminating.
dic 21 15:34:04 centrum systemd[1]: Failed to start LSB: Xen daemons.
dic 21 15:34:04 centrum systemd[1]: Unit xen.service entered failed state.

Log files in /var/log/xen aren't touched: no information has been
printed there after debian upgrade.

Some operation take forever, like
centrum:/tmp# time xenstore-write "/local/domain/0/name"
"Domain-0"
(never return: I killed it after 30 minutes)

and this xenstore-write command that take forever is the reason for
systemd setting the status as "timeout".

How may I solve, or better debug, this problem?

Thank you very much,
Giuseppe

Control: merge?369042 808624

On Mon, 2015-12-21 at 16:31 +0100, Giuseppe Sacco wrote:
> Package: xen-hypervisor-4.4-amd64
> Version:?4.4.1-9+deb8u3
> Severity: important
> 
> I just upgraded a machine used for hosting a few VM with Xen. The
> machine was running debian squeeze, so I updated to wheezy and then
> jessie. Xen is now version 4.4, cpu is 64 bits, dom0 is 32 bits
> userland with 64 bits kernel?3.16.0-4-amd64.
Unfortunately this is not a combination supported by Xen. Supported options
are:

    64-bit Xen, 64-bit dom0 kernel, 64-bit dom0 userspace
    64-bit Xen, 32-bit dom0 kernel, 32-bit dom0 userspace

You are using:

    64-bit Xen, 64-bit dom0 kernel, 32-bit dom0 userspace

which causes...
> dic 21 15:29:04 centrum xen[28167]: Starting Xen daemons: xenstored
> xenconsoled init-dom0FATAL: Failed to initialize dom0 state:
> Inappropriate ioctl for device
.... xenstored not to start, which in turn causes ...
>?
> and this xenstore-write command that take forever is the reason for
> systemd setting the status as "timeout".
... xenstore-write to hang trying to talk to the daemon.

Therefore this is the same issue as #369042 (therefore merging).

With this being unsupported upstream your options within Debian are either
to switch to a 32-bit dom0 kernel (easiest) or to cross-grade your
userspace to 64-bit (harder).

Outside of Debian I'm not sure what fixes would be required to make this
work upstream but I suppose you could try (by far the hardest option, not
on the roadmap upstream AFAIK)

Ian.

Processing control commands:
> merge?369042 808624
Bug #369042 [src:xen] 32-bit toolstack does not work on 64-bit kernel+hypervisor
Bug #503287 [src:xen] 32-bit toolstack does not work on 64-bit kernel+hypervisor
Bug #737613 [src:xen] 32-bit toolstack does not work on 64-bit kernel+hypervisor
Unable to merge bugs because:
severity of #808624 is 'important' not 'normal'
package of #808624 is 'xen-hypervisor-4.4-amd64' not 'src:xen'
Failed to merge 369042: Did not alter merged bugs.


-- 
369042: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=369042
503287: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=503287
737613: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=737613
808624: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=808624
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