Xen users - Jan 2011 - Hotplug scripts not working?

I recently updated my test machine running a custom 2.6.31.10 kernel from
Xen 3.4 to Xen 4.0 on Debian squeeze.

At this point I can boot a domU, but only when I have no ''vif''
defined in
it''s config file. When I try and use any form of networking, NAT or
bridge I
get a kernel Oops:

(cdrom_add_media_watch() file=drivers/xen/blkback/cdrom.c,
line=108)
> nodename:backend/vbd/1/2049
> (cdrom_is_type() file=drivers/xen/blkback/cdrom.c, line=95) type:0
> blkback: ring-ref 8, event-channel 10, protocol 1 (x86_64-abi)
> BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
> IP: [<ffffffff812509b4>] netback_uevent+0x34/0xba
> PGD 0
> Oops: 0000 [#1] SMP
> last sysfs file: /sys/devices/xen-backend/vif-2-0/uevent
> CPU 0

And after that, I get:

Error: Device 0 (vif) could not be connected. Hotplug scripts not working.


Any help would be fantastic!


Chris Benninger


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On Thu, Jan 06, 2011 at 12:21:09PM -0800, chrisbenninger
wrote:
>    I recently updated my test machine running a custom 2.6.31.10 kernel
from
>    Xen 3.4 to Xen 4.0 on Debian squeeze.
>
You should update your dom0 kernel.

2.6.31.x tree is unsupported and not maintained anymore.
It has many known bugs.

You should update to xen/stable-2.6.32.x git branch.
See: http://wiki.xen.org/xenwiki/XenParavirtOps

>    At this point I can boot a domU, but only when I have no
''vif'' defined in
>    it''s config file. When I try and use any form of networking,
NAT or bridge
>    I get a kernel Oops:
> 
>      (cdrom_add_media_watch() file=drivers/xen/blkback/cdrom.c, line=108)
>      nodename:backend/vbd/1/2049
>      (cdrom_is_type() file=drivers/xen/blkback/cdrom.c, line=95) type:0
>      blkback: ring-ref 8, event-channel 10, protocol 1 (x86_64-abi)
>      BUG: unable to handle kernel NULL pointer dereference at
>      0000000000000008
The driver crashed.

>      IP: [<ffffffff812509b4>] netback_uevent+0x34/0xba
>      PGD 0
>      Oops: 0000 [#1] SMP
>      last sysfs file: /sys/devices/xen-backend/vif-2-0/uevent
>      CPU 0
> 
>    And after that, I get:
> 
>      Error: Device 0 (vif) could not be connected. Hotplug scripts not
>      working.
> 
>    Any help would be fantastic!
hotplug scripts won''t work because the netback driver crashed.
Update the dom0 kernel.

-- Pasi


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