Bug#573829: drbd disagrees about version of symbol cn_add_callback after kernel upgrade

[David Marshall <david@marshall.id.au>]

Package: drbd8-modules-2.6.26-2-xen-686
Version: 2.6.26+8.0.14-6+lenny1

After upgrading xen-utils, linux-image-2.6.26-2-xen-686 and 
linux-modules-2.6.26-2-xen-686 drbd fails to start.

I see the following errors in syslog:
Mar 14 17:24:01 carbon modprobe: FATAL: Error inserting drbd 
(/lib/modules/2.6.26-2-xen-686/extra/drbd8/drbd/drbd.ko): Unknown symbol 
in module, or unknown parameter (see dmesg)
Mar 14 17:24:01 carbon kernel: [   28.197796] drbd: disagrees about 
version of symbol cn_add_callback
Mar 14 17:24:01 carbon kernel: [   28.198014] drbd: Unknown symbol 
cn_add_callback


My version of linux is:
Linux carbon 2.6.26-2-xen-686 #1 SMP Tue Mar 9 20:11:42 UTC 2010 i686 
GNU/Linux


Thank you.