[Xen-users] Randomly missing even-numbered vbd devices from domU

["Christopher S. Aker" <caker@xxxxxxxxxxxx>]

If I start a domain with a number of vbd devices, it's a crap shoot if 
they'll all show up in the domU's /proc/partitions.  I'll eventually see 
all the devices if I keep rebooting the domU.
The value of /local/domain/$DOMID/device/vbd/*/state are all 1 for the 
missing devices, and 4 for the ones that show up.
When it works:

domU:~# cat /proc/partitions
major minor  #blocks  name

   3     1    1024000 hda1
   3     2     266240 hda2
   3     3     102400 hda3
   3     4     217088 hda4

[2006-03-27 16:19:40 xend] DEBUG (DevController:132) Waiting for devices 
vbd.
[2006-03-27 16:19:40 xend] DEBUG (DevController:138) Waiting for 769.
[2006-03-27 16:19:40 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vbd/21/769/hotplug-status.
[2006-03-27 16:19:40 xend] DEBUG (DevController:417) 
hotplugStatusCallback 1.
[2006-03-27 16:19:40 xend] DEBUG (DevController:138) Waiting for 770.
[2006-03-27 16:19:40 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vbd/21/770/hotplug-status.
[2006-03-27 16:19:41 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vbd/21/770/hotplug-status.
[2006-03-27 16:19:41 xend] DEBUG (DevController:417) 
hotplugStatusCallback 1.
[2006-03-27 16:19:41 xend] DEBUG (DevController:138) Waiting for 771.
[2006-03-27 16:19:41 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vbd/21/771/hotplug-status.
[2006-03-27 16:19:43 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vbd/21/771/hotplug-status.
[2006-03-27 16:19:43 xend] DEBUG (DevController:417) 
hotplugStatusCallback 1.
[2006-03-27 16:19:43 xend] DEBUG (DevController:138) Waiting for 772.
[2006-03-27 16:19:43 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vbd/21/772/hotplug-status.
[2006-03-27 16:19:43 xend] DEBUG (DevController:417) 
hotplugStatusCallback 1.
When it doesn't:

domU:~# cat /proc/partitions
major minor  #blocks  name

   3     1    1024000 hda1
   3     3     102400 hda3

[2006-03-27 16:20:40 xend] DEBUG (DevController:132) Waiting for devices 
vbd.
[2006-03-27 16:20:40 xend] DEBUG (DevController:138) Waiting for 769.
[2006-03-27 16:20:40 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vbd/22/769/hotplug-status.
[2006-03-27 16:20:42 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vbd/22/769/hotplug-status.
[2006-03-27 16:20:42 xend] DEBUG (DevController:417) 
hotplugStatusCallback 1.
[2006-03-27 16:20:42 xend] DEBUG (DevController:138) Waiting for 770.
[2006-03-27 16:20:42 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vbd/22/770/hotplug-status.
[2006-03-27 16:20:42 xend] DEBUG (DevController:417) 
hotplugStatusCallback 1.
[2006-03-27 16:20:42 xend] DEBUG (DevController:138) Waiting for 771.
[2006-03-27 16:20:42 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vbd/22/771/hotplug-status.
[2006-03-27 16:20:42 xend] DEBUG (DevController:417) 
hotplugStatusCallback 1.
[2006-03-27 16:20:42 xend] DEBUG (DevController:138) Waiting for 772.
[2006-03-27 16:20:42 xend] DEBUG (DevController:403) 
hotplugStatusCallback /local/domain/0/backend/vbd/22/772/hotplug-status.
[2006-03-27 16:20:42 xend] DEBUG (DevController:417) 
hotplugStatusCallback 1.
There are no other errors in xend's debug output, and AFAICT the above 
output doesn't display anything abnormal.
Interestingly, it's only the even numbered devices that will 
occasionally not show up (2nd device, 4th device, etc).
Xen-unstable, changeset: Sun Mar 26 11:50:39 2006 +0100 9441:30ae67d6e5f0

Any thoughts or something else I should be hunting for?

Thanks,
-Chris


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