[Xen-devel] vbd devices stuck in Initialising/InitWait

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

Sorry for the cross-post.  I'm looking for advice on where next to debug 
my problem outlined here:
http://lists.xensource.com/archives/html/xen-users/2006-03/msg00850.html

Not all vbds are coming up in my domU.  This happens randomly, so 
rebooting a time or two will bring them back, but it's unpredictable. 
Normally it's only the even numbered devices, but I have seen an odd one 
missing.
This can happen regardless of if I specify the devices in a conf file, 
or start a domU paused and add them with block-attach.
Xen-unstable, changeset Sun Mar 26 11:50:39 2006 +0100 9441:30ae67d6e5f0

For a missing device:
dom0:~# xenstore-read /local/domain/0/backend/vbd/77/770/state
2
dom0:~# xenstore-read /local/domain/77/device/vbd/770/state
1

Normally:
dom0:~# xenstore-read /local/domain/0/backend/vbd/77/769/state
4
dom0:~# xenstore-read /local/domain/77/device/vbd/769/state
4

According to the xenbusState values, the frontend is Initialising, and 
the backend is in InitWait.  From my (very basic) understanding of the 
code in the frontend and backend drivers, it looks to me like the 
backend is waiting for the frontend driver to finish initialising and 
switch to XenbusStateInitialised, but that's never happening...
Any help you could offer debugging this issue would be appreciated.

Thanks,
-Chris

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