Multiple LORs in -CURRENT

   Following LORs popped up after updating from an old HEAD(around Dec-2007)
to today's -CURRENT.

FreeBSD 8.0-CURRENT #17: Mon Jun  2 12:35:17 CST 2008
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pass0 at ata1 bus 0 target 0 lun 0
pass0: <HL-DT-ST DVD-ROM GDR8082N 0007> Removable CD-ROM SCSI-0 device
pass0: 16.000MB/s transfers
WARNING: WITNESS option enabled, expect reduced performance.
lock order reversal: (sleepable after non-sleepable)
  1st 0xc2fc801c struct mount mtx (struct mount mtx) _at_ kern/vfs_subr.c:343
  2nd 0xc2fc8000 vfslock (vfslock) _at_ kern/vfs_subr.c:370
KDB: stack backtrace:
db_trace_self_wrapper(c06f3059,c2a71b64,c058318e,c06f56a6,c2fc8000,...) at db_trace_self_wrapper+0x26
kdb_backtrace(c06f56a6,c2fc8000,c06fb51a,c06fb51a,c06fbacb,...) at kdb_backtrace+0x29
witness_checkorder(c2fc8000,1,c06fbac2,172,c076aab8,...) at witness_checkorder+0x6de
__lockmgr_args(c2fc8000,200100,c2fc801c,0,0,...) at __lockmgr_args+0x230
vfs_busy(c2fc8000,200,0,c2c4c000,1,...) at vfs_busy+0x1bc
vfs_mount_alloc(0,c07224e0,c06fb868,c2c4c000,c05c1f60,...) at vfs_mount_alloc+0x78
vfs_mountroot(c0764af0,4,c06eb522,264,c057aaf4,...) at vfs_mountroot+0x26c
start_init(0,c2a71d38,c06ece31,324,c2c4a000,...) at start_init+0x65
fork_exit(c05126d0,0,c2a71d38) at fork_exit+0xb8
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xc2a71d70, ebp = 0 ---
lock order reversal: (sleepable after non-sleepable)
  1st 0xc2ed9e10 vnode interlock (vnode interlock) _at_ fs/devfs/devfs_vnops.c:288
  2nd 0xc2ed9df4 devfs (devfs) _at_ kern/vfs_subr.c:2044
KDB: stack backtrace:
db_trace_self_wrapper(c06f3059,c2a71a8c,c058318e,c06f56a6,c2ed9df4,...) at db_trace_self_wrapper+0x26
kdb_backtrace(c06f56a6,c2ed9df4,c06e874c,c06e874c,c06fbacb,...) at kdb_backtrace+0x29
witness_checkorder(c2ed9df4,9,c06fbac2,7fc,c2ed9df4,...) at witness_checkorder+0x6de
__lockmgr_args(c2ed9df4,80100,c2ed9e10,0,0,...) at __lockmgr_args+0x766
vop_stdlock(c2a71b8c,c06e8903,c06f50a6,80100,c2ed9d9c,...) at vop_stdlock+0x62
VOP_LOCK1_APV(c07225c0,c2a71b8c,c0748320,c2ed9d9c,80100,...) at VOP_LOCK1_APV+0xa5
_vn_lock(c2ed9d9c,80100,c06fbac2,7fc,c06e88fa,...) at _vn_lock+0x5e
vget(c2ed9d9c,80100,c2c4c000,121,c06e889b,...) at vget+0x9c
devfs_allocv(c2faac00,c2fc8000,c2a71c20,c2c4c000,c2c4c0a4,...) at devfs_allocv+0x11a
devfs_root(c2fc8000,80000,c07b2234,c2c4c000,4,...) at devfs_root+0x51
set_rootvnode(c07b2220,0,c06fb41b,5f4,c05c1f60,...) at set_rootvnode+0x2d
vfs_mountroot(c0764af0,4,c06eb522,264,c057aaf4,...) at vfs_mountroot+0x34c
start_init(0,c2a71d38,c06ece31,324,c2c4a000,...) at start_init+0x65
fork_exit(c05126d0,0,c2a71d38) at fork_exit+0xb8
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xc2a71d70, ebp = 0 ---
lock order reversal:
  1st 0xc2ed9df4 devfs (devfs) _at_ kern/vfs_subr.c:2044
  2nd 0xc2fa7614 devfsmount (devfsmount) _at_ fs/devfs/devfs_vnops.c:292
KDB: stack backtrace:
db_trace_self_wrapper(c06f3059,c2a71bb0,c058318e,c06f56a6,c2fa7614,...) at db_trace_self_wrapper+0x26
kdb_backtrace(c06f56a6,c2fa7614,c06e88e0,c06e88e0,c06e8903,...) at kdb_backtrace+0x29
witness_checkorder(c2fa7614,9,c06e88fa,124,122,...) at witness_checkorder+0x6de
_sx_xlock(c2fa7614,0,c06e88fa,124,c06e889b,...) at _sx_xlock+0x7d
devfs_allocv(c2faac00,c2fc8000,c2a71c20,c2c4c000,c2c4c0a4,...) at devfs_allocv+0x13f
devfs_root(c2fc8000,80000,c07b2234,c2c4c000,4,...) at devfs_root+0x51
set_rootvnode(c07b2220,0,c06fb41b,5f4,c05c1f60,...) at set_rootvnode+0x2d
vfs_mountroot(c0764af0,4,c06eb522,264,c057aaf4,...) at vfs_mountroot+0x34c
start_init(0,c2a71d38,c06ece31,324,c2c4a000,...) at start_init+0x65
fork_exit(c05126d0,0,c2a71d38) at fork_exit+0xb8
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xc2a71d70, ebp = 0 ---
Trying to mount root from ufs:/dev/ad0s3a
lock order reversal: (sleepable after non-sleepable)
  1st 0xc2ed9b20 bufobj interlock (bufobj interlock) _at_ kern/vfs_bio.c:2442
  2nd 0xc292fe80 bufwait (bufwait) _at_ kern/vfs_bio.c:2456
KDB: stack backtrace:
db_trace_self_wrapper(c06f3059,c2a71788,c058318e,c06f56a6,c292fe80,...) at db_trace_self_wrapper+0x26
kdb_backtrace(c06f56a6,c292fe80,c06fa413,c06fa413,c06f9984,...) at kdb_backtrace+0x29
witness_checkorder(c292fe80,9,c06f997b,998,c076aab8,...) at witness_checkorder+0x6de
__lockmgr_args(c292fe80,81900,c2ed9b20,c06fa36f,50,...) at __lockmgr_args+0x766
getblk(c2ed9a78,0,0,800,0,...) at getblk+0x153
breadn(c2ed9a78,0,0,800,0,...) at breadn+0x44
bread(c2ed9a78,0,0,800,0,...) at bread+0x4c
ffs_blkatoff(c2ed9a78,0,0,0,c2a719a8,...) at ffs_blkatoff+0xd1
ufs_lookup(c2a719ec,c2ed9a78,c2a71b50,c2ed9a78,c2a71a0c,...) at ufs_lookup+0x2e6
VOP_CACHEDLOOKUP_APV(c073b640,c2a719ec,c2a71b50,c2a71b3c,c2c53100,...) at VOP_CACHEDLOOKUP_APV+0xa5
vfs_cache_lookup(c2a71a6c,c2a71a6c,c2a71b50,80000,c2ed9a78,...) at vfs_cache_lookup+0xd0
VOP_LOOKUP_APV(c073b640,c2a71a6c,c2a71b50,1b0,c2a71b3c,...) at VOP_LOOKUP_APV+0xa5
lookup(c2a71b24,c06fb1e7,d8,c0,c2c5322c,...) at lookup+0x54e
namei(c2a71b24,c2a71b28,c058296c,c06fb51a,c07b1a68,...) at namei+0x38b
kern_unlinkat(c2c4c000,ffffff9c,c06fb864,1,c2a71c5c,...) at kern_unlinkat+0x46
kern_unlink(c2c4c000,c06fb864,1,62f,0,...) at kern_unlink+0x27
vfs_mountroot_try(c06fba1e,c06d636a,c06fb869,1,c05c1f60,...) at vfs_mountroot_try+0x472
vfs_mountroot(c0764af0,4,c06eb522,264,c057aaf4,...) at vfs_mountroot+0x40e
start_init(0,c2a71d38,c06ece31,324,c2c4a000,...) at start_init+0x65
fork_exit(c05126d0,0,c2a71d38) at fork_exit+0xb8
fork_trampoline() at fork_trampoline+0x8
--- trap 0, eip = 0, esp = 0xc2a71d70, ebp = 0 ---
start_init: trying /sbin/init