vwakeup: neg numoutput

[Manuel Bouyer <bouyer%antioche.eu.org@localhost>]

Hi,
I just got this on a -current a few days old, xen/amd64 dom0 (with vnd
as block device backend for domUs):
panic: vwakeup: neg numoutput, vp 0xffffa0000d7a9568
Stopped in pid 0.4 (system) at  netbsd:breakpoint+0x5:  leave
breakpoint() at netbsd:breakpoint+0x5
panic() at netbsd:panic+0x25b
vwakeup() at netbsd:vwakeup+0x7c
biodone2() at netbsd:biodone2+0xaa
biointr() at netbsd:biointr+0x3c
softint_thread() at netbsd:softint_thread+0x89

db> show vnode 0xffffa0000d7a9568
OBJECT 0xffffa0000d7a9568: locked=1, pgops=0xffffffff806bd920, npages=0, refs=1

VNODE flags 10<MPSAFE>
mp 0x0 numoutput -1 size 0x0 writesize 0x0
data 0x0 writecount 0 holdcnt 0
tag UNKNOWN(0) type VBLK(3) mount 0x0 typedata 0xffffa0000d341e90
v_lock 0xffffa0000d7a9648 v_vnlock 0xffffa0000d7a9648

db> show vnode /f 0xffffa0000d7a9568
OBJECT 0xffffa0000d7a9568: locked=1, pgops=0xffffffff806bd920, npages=0, refs=1
  PAGES <pg,offset>:

VNODE flags 10<MPSAFE>
mp 0x0 numoutput -1 size 0x0 writesize 0x0
data 0x0 writecount 0 holdcnt 0
tag UNKNOWN(0) type VBLK(3) mount 0x0 typedata 0xffffa0000d341e90
v_lock 0xffffa0000d7a9648 v_vnlock 0xffffa0000d7a9648
clean bufs:
dirty bufs:


any idea ?

-- 
Manuel Bouyer <bouyer%antioche.eu.org@localhost>
     NetBSD: 26 ans d'experience feront toujours la difference
--