panic: kernel diagnostic assertion "xbdi->xbdi_pendingreqs == 0" failed - NetBSD 5-STABLE & xenkernel33-3.3.2nb4

["John R. Shannon" <john.r.shannon%us.army.mil@localhost>]

panic: kernel diagnostic assertion "xbdi->xbdi_pendingreqs == 0" failed:
file "src/sys/arch/xen/xen/xbdback_xenbus.c", line 978
Begin traceback...
copyright() at 0xffffffff808f019e
End traceback..

This appears to be the same problem reported by Jeff Rizzo on 19 Sep
2011. In my case, the revision of xbdback_xenbus.c is 1.20.4.6
2011/08/12 20:48:47.

-- 
John R. Shannon

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