FYI:   Just saw this today after a fresh install of 266923 - GENERIC kernel:

root@darkstor:/ # uname -a
FreeBSD darkstor 11.0-CURRENT FreeBSD 11.0-CURRENT #0 r266923: Sat May 31 
10:21:54 CDT 2014     root@darkstor:/usr/obj/usr/src/sys/GENERIC  amd64

lock order reversal:
 1st 0xfffff8029cfe79a0 syncer (syncer) @ /usr/src/sys/kern/vfs_subr.c:1720
 2nd 0xfffff8029b2a69a0 zfs (zfs) @ /usr/src/sys/kern/vfs_subr.c:2101
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe085efe55a0
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe085efe5650
witness_checkorder() at witness_checkorder+0xdc2/frame 0xfffffe085efe56e0
__lockmgr_args() at __lockmgr_args+0x9ca/frame 0xfffffe085efe5810
vop_stdlock() at vop_stdlock+0x3c/frame 0xfffffe085efe5830
VOP_LOCK1_APV() at VOP_LOCK1_APV+0xfc/frame 0xfffffe085efe5860
_vn_lock() at _vn_lock+0xaa/frame 0xfffffe085efe58d0
vget() at vget+0x67/frame 0xfffffe085efe5910
vfs_msync() at vfs_msync+0xa7/frame 0xfffffe085efe5970
sync_fsync() at sync_fsync+0xff/frame 0xfffffe085efe59a0
VOP_FSYNC_APV() at VOP_FSYNC_APV+0xf7/frame 0xfffffe085efe59d0
sched_sync() at sched_sync+0x34b/frame 0xfffffe085efe5a70
fork_exit() at fork_exit+0x84/frame 0xfffffe085efe5ab0
fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe085efe5ab0
--- trap 0, rip = 0, rsp = 0xfffffe085efe5b70, rbp = 0 ---

scrub of the pool is in progresss, some mongodb usage/testing was occuring at 
the same time.

Pool info:

root@darkstor:~ # zpool status -v
  pool: tank
 state: ONLINE
  scan: scrub in progress since Sat May 31 13:00:39 2014
        1.97T scanned out of 4.67T at 157M/s, 5h0m to go
        0 repaired, 42.16% done
config:

        NAME           STATE     READ WRITE CKSUM
        tank           ONLINE       0     0     0
          raidz1-0     ONLINE       0     0     0
            gpt/disk0  ONLINE       0     0     0
            gpt/disk1  ONLINE       0     0     0
            gpt/disk2  ONLINE       0     0     0
            gpt/disk3  ONLINE       0     0     0
            gpt/disk4  ONLINE       0     0     0
        cache
          gpt/larc5    ONLINE       0     0     0

errors: No known data errors

Hope this helps,

dan
--
Dan Mack

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