Two fresh LORs from the latest 11-stable

[Benjamin Kaduk]

On the face of it, those don't seem to be new/fresh.
bufwait/dirhash and ufs/bufwait/ufs I have seen for a very long time and
are believed to be harmless.

Though ... isn't WITNESS out of GENERIC on stable/11?

-Ben

On Thu, 21 Jul 2016, Maxim Sobolev wrote:

> Seen those on our build box right after pulling latest update.
>
> lock order reversal:
>  1st 0xfffffe00f62564c0 bufwait (bufwait) @
> /usr/home/sobomax/freebsd11.git/sys/kern/vfs_bio.c:3512
>  2nd 0xfffff80003d33800 dirhash (dirhash) @
> /usr/home/sobomax/freebsd11.git/sys/ufs/ufs/ufs_dirhash.c:281
> stack backtrace:
> #0 0xffffffff80ab5fc0 at witness_debugger+0x70
> #1 0xffffffff80ab5eb4 at witness_checkorder+0xe54
> #2 0xffffffff80a5f1d2 at _sx_xlock+0x72
> #3 0xffffffff80d1d8dd at ufsdirhash_add+0x3d
> #4 0xffffffff80d206aa at ufs_direnter+0x4da
> #5 0xffffffff80d28d09 at ufs_mkdir+0x8a9
> #6 0xffffffff810235e0 at VOP_MKDIR_APV+0xe0
> #7 0xffffffff80b23ef8 at kern_mkdirat+0x208
> #8 0xffffffff80ec7b2b at amd64_syscall+0x2db
> #9 0xffffffff80ea767b at Xfast_syscall+0xfb
>
> lock order reversal:
>  1st 0xfffff80064d86d50 ufs (ufs) @
> /usr/home/sobomax/freebsd11.git/sys/kern/vfs_subr.c:2523
>  2nd 0xfffffe00f669fe00 bufwait (bufwait) @
> /usr/home/sobomax/freebsd11.git/sys/ufs/ffs/ffs_vnops.c:263
>  3rd 0xfffff800a5c4eb78 ufs (ufs) @
> /usr/home/sobomax/freebsd11.git/sys/kern/vfs_subr.c:2523
> stack backtrace:
> #0 0xffffffff80ab5fc0 at witness_debugger+0x70
> #1 0xffffffff80ab5eb4 at witness_checkorder+0xe54
> #2 0xffffffff80a2f052 at __lockmgr_args+0x4c2
> #3 0xffffffff80d18546 at ffs_lock+0xa6
> #4 0xffffffff81023fd0 at VOP_LOCK1_APV+0xe0
> #5 0xffffffff80b26aaa at _vn_lock+0x9a
> #6 0xffffffff80b16ed4 at vget+0x64
> #7 0xffffffff80b095cc at vfs_hash_get+0xcc
> #8 0xffffffff80d14250 at ffs_vgetf+0x40
> #9 0xffffffff80d0b4a6 at softdep_sync_buf+0x496
> #10 0xffffffff80d19136 at ffs_syncvnode+0x256
> #11 0xffffffff80cefed3 at ffs_truncate+0x8d3
> #12 0xffffffff80d20851 at ufs_direnter+0x681
> #13 0xffffffff80d28d09 at ufs_mkdir+0x8a9
> #14 0xffffffff810235e0 at VOP_MKDIR_APV+0xe0
> #15 0xffffffff80b23ef8 at kern_mkdirat+0x208
> #16 0xffffffff80ec7b2b at amd64_syscall+0x2db
> #17 0xffffffff80ea767b at Xfast_syscall+0xfb
>
> -Max
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