vinum panic on -devel

["Simon 'corecode' Schubert" <corecode@xxxxxxxxxxxx>]

hey,

as rumko already mentioned on the irc channel (but failed to post here), 
there is a panic in vinum:

reproduce: create new vinum volume, then try to newfs -v it.

gives this backtrace:

#12 0xc016496e in dev_dstrategy (dev=0xcbecdec0, bio=0xd2280368)
    at /usr/build/src/sys/kern/kern_device.c:214
#13 0xd61ce07d in launch_requests (rq=0x1, reviveok=0)
    at /usr/build/src/sys/dev/raid/vinum/vinumrequest.c:437
#14 0xd61cdeed in vinumstart (dev=0xcbed04f0, bio=0xc249e868, reviveok=0)
    at /usr/build/src/sys/dev/raid/vinum/vinumrequest.c:305
#15 0xd61cdc6f in vinumstrategy (dev=0xcbed04f0, bio=0xc249e830)
    at /usr/build/src/sys/dev/raid/vinum/vinumrequest.c:174
#16 0xc016475b in cdevsw_putport (port=0xc0310940, lmsg=0xd61e2a20)
    at /usr/build/src/sys/kern/kern_device.c:98
#17 0xc017f97e in lwkt_domsg (port=0xcbecdec0, msg=0xd61e2a20) at 
msgport2.h:92
#18 0xc0164a0c in dev_dstrategy (dev=0xcbed04f0, bio=0xc249e830)
    at /usr/build/src/sys/kern/kern_device.c:225
#19 0xc0171b62 in physio (dev=0xcbed04f0, uio=0xd61e2c98, ioflag=1)
    at /usr/build/src/sys/kern/kern_physio.c:109
#20 0xc01647f8 in cdevsw_putport (port=0xc0310940, lmsg=0xd61e2af4)
    at /usr/build/src/sys/kern/kern_device.c:127
#21 0xc017f97e in lwkt_domsg (port=0xcbecdec0, msg=0xd61e2af4) at 
msgport2.h:92
#22 0xc0164c8f in dev_dwrite (dev=0xd2280338, uio=0x0, ioflag=0)
    at /usr/build/src/sys/kern/kern_device.c:322
#23 0xc01cd967 in spec_write (ap=0xd61e2b98) at 
/usr/build/src/sys/vfs/specfs/spec_vnops.c:356
#24 0xc0237f06 in ufsspec_write (ap=0xd61e2b98) at 
/usr/build/src/sys/vfs/ufs/ufs_vnops.c:1920
#25 0xc023865e in ufs_vnoperatespec (ap=0xcbecdec0) at 
/usr/build/src/sys/vfs/ufs/ufs_vnops.c:2480
#26 0xc01cb0f9 in vop_write (ops=0xcbecdec0, vp=0xd5cc4800, uio=0x0, 
ioflag=0, cred=0x0)
    at /usr/build/src/sys/kern/vfs_vopops.c:367
#27 0xc01ca789 in vn_write (fp=0xc23893c0, uio=0xd61e2c98, cred=0x0, 
flags=0)
    at /usr/build/src/sys/kern/vfs_vnops.c:644
#28 0xc01937ac in dofilewrite (fd=0, fp=0xc23893c0, auio=0xd61e2c98, 
flags=0, res=0x0)
    at file2.h:72
#29 0xc01936c3 in kern_pwritev (fd=3, auio=0x0, flags=0, res=0x0)
    at /usr/build/src/sys/kern/sys_generic.c:449
#30 0xc01933dc in sys_write (uap=0xd61e2cf4) at 
/usr/build/src/sys/kern/sys_generic.c:325


(kgdb) fra 12
#12 0xc016496e in dev_dstrategy (dev=0xcbecdec0, bio=0xd2280368)
    at /usr/build/src/sys/kern/kern_device.c:214
214         KKASSERT(bio->bio_buf->b_cmd != BUF_CMD_DONE);
(kgdb) p *bio
$1 = {bio_act = {tqe_next = 0x0, tqe_prev = 0x0}, bio_track = 0x0, 
bio_prev = 0x0, bio_next = 0x0,
  bio_buf = 0x0, bio_done = 0xd61c8bc0 <complete_rqe>, bio_offset = 
44974435328,
  bio_driver_info = 0xcbecdec0, bio_caller_info1 = {ptr = 0x0, offset = 
0, index = 0,
    cluster_head = 0x0, cluster_parent = 0x0}, bio_caller_info2 = {ptr 
= 0x0, offset = 0,
    index = 0, cluster_tail = 0x0}}
(kgdb) p *bio->bio_buf
Cannot access memory at address 0x0

cheers
  simon

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