a fresh install off the 2014-10-26 bootonly iso, generates the
following LOR:

lock order reversal:
 1st 0xfffffe00f7626b48 bufwait (bufwait) @ /usr/src/sys/kern/vfs_bio.c:3093
 2nd 0xfffff8000404aa00 dirhash (dirhash) @
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe0120cd9650
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe0120cd9700
witness_checkorder() at witness_checkorder+0xdad/frame 0xfffffe0120cd9790
_sx_xlock() at _sx_xlock+0x75/frame 0xfffffe0120cd97d0
ufsdirhash_remove() at ufsdirhash_remove+0x37/frame 0xfffffe0120cd9800
ufs_dirremove() at ufs_dirremove+0x11b/frame 0xfffffe0120cd9860
ufs_remove() at ufs_remove+0x75/frame 0xfffffe0120cd98c0
VOP_REMOVE_APV() at VOP_REMOVE_APV+0xf7/frame 0xfffffe0120cd98f0
kern_unlinkat() at kern_unlinkat+0x209/frame 0xfffffe0120cd9ae0
amd64_syscall() at amd64_syscall+0x25a/frame 0xfffffe0120cd9bf0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe0120cd9bf0
--- syscall (10, FreeBSD ELF64, sys_unlink), rip = 0x800b5208a, rsp =
eb58, rbp = 0x7fffffffeb70 ---

it's not FATAL, but thought it worth mentioning.
I haven't built, or installed world|kernel (yet). I also have
dmesg(8) from that session, out of var/run/dmesg.boot, and would
be happy to provide it, on request.

Thank you for all your time, and consideration.


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