[Bug 191782] New: LOR on reboot r2643181

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=191782

            Bug ID: 191782
           Summary: LOR on reboot r2643181
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: amd64
                OS: Any
            Status: Needs Triage
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: mikej at mikej.com

LOR on reboot 

Could not find exact LOR documented bug database/Google/mail archive.

FreeBSD bsd11 11.0-CURRENT FreeBSD 11.0-CURRENT #1 r264318M: Thu Apr 10
12:32:03 EDT 2014     mikej at bsd11:/usr/obj/usr/src/sys/GENERIC  amd64

devfs mounted by poudriere
tank on /tank (zfs, local, nfsv4acls) <poudriere builds here>

# Device        Mountpoint      FStype  Options Dump    Pass#
/dev/da0p2      /               ufs     rw      1       1
/dev/da0p3      none            swap    sw      0       0

All buffers synced.
lock order reversal:
 1st 0xfffff8000e658d50 ufs (ufs) @ /usr/src/sys/kern/vfs_mount.c:1237
 2nd 0xfffff8000e6595f0 devfs (devfs) @ /usr/src/sys/kern/vfs_subr.c:2101
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe1009f8e5b0
kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe1009f8e660
witness_checkorder() at witness_checkorder+0xdc2/frame 0xfffffe1009f8e6f0
__lockmgr_args() at __lockmgr_args+0x9ca/frame 0xfffffe1009f8e820
vop_stdlock() at vop_stdlock+0x3c/frame 0xfffffe1009f8e840
VOP_LOCK1_APV() at VOP_LOCK1_APV+0xfc/frame 0xfffffe1009f8e870
_vn_lock() at _vn_lock+0xaa/frame 0xfffffe1009f8e8e0
vget() at vget+0x67/frame 0xfffffe1009f8e920
devfs_allocv() at devfs_allocv+0xfd/frame 0xfffffe1009f8e970
devfs_root() at devfs_root+0x43/frame 0xfffffe1009f8e9a0
dounmount() at dounmount+0x366/frame 0xfffffe1009f8ea20
vfs_unmountall() at vfs_unmountall+0x61/frame 0xfffffe1009f8ea50
kern_reboot() at kern_reboot+0x530/frame 0xfffffe1009f8eac0
sys_reboot() at sys_reboot+0x5a/frame 0xfffffe1009f8eae0
amd64_syscall() at amd64_syscall+0x25a/frame 0xfffffe1009f8ebf0
Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe1009f8ebf0
--- syscall (55, FreeBSD ELF64, sys_reboot), rip = 0x40f2ec, rsp =
0x7fffffffe6d8, rbp = 0x7fffffffe7d0 ---
Uptime: 51d21h25m4s

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