vfs_bio KASSERT (again)

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

Hi,
I got this panic on a -current amd64 XEN3_DOM0 system:
login: panic: kernel diagnostic assertion "!ISSET(bp->b_cflags, BC_BUSY)" 
failed: file "/dsk/l1/misc/bouyer/current/src/sys/kern/vfs_bio.c", line 1316
fatal breakpoint trap in supervisor mode
trap type 1 code 0 rip ffffffff804ab50d cs e030 rflags 246 cr2  7f7ffdfec000 
cpl 0 rsp ffffa0002c69b710
Stopped in pid 2649.1 (find) at netbsd:breakpoint+0x5:  leave
breakpoint() at netbsd:breakpoint+0x5
panic() at netbsd:panic+0x255
__kernassert() at netbsd:__kernassert+0x2d
getnewbuf() at netbsd:getnewbuf+0x2b4
getblk() at netbsd:getblk+0x91
bio_doread() at netbsd:bio_doread+0x24
bread() at netbsd:bread+0x22
ffs_read() at netbsd:ffs_read+0x372
VOP_READ() at netbsd:VOP_READ+0x2d
ufs_readdir() at netbsd:ufs_readdir+0x10b
VOP_READDIR() at netbsd:VOP_READDIR+0x39
vn_readdir() at netbsd:vn_readdir+0x10e
sys___getdents30() at netbsd:sys___getdents30+0x89
syscall() at netbsd:syscall+0x98

kernel is
NetBSD 4.99.66 (XEN3_DOM0) #199: Thu Jun 19 11:09:00 CEST 2008

Does someone have an idea about it ?

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