lock order reversal another, repeatable...

From: Jeffrey Bouquet <jbtakk_at_iherebuywisely.com>
Date: Sat, 25 Mar 2017 06:00:22 -0700 (PDT)
Mar 24 14:25:16  kernel: lock order reversal:
Mar 24 14:25:16  kernel: 1st 0xc09cf6dc ufs (ufs) _at_ /usr/src/sys/kern/vfs_mount.c:1277
Mar 24 14:25:16  kernel: 2nd 0xc0100a30 devfs (devfs) _at_ /usr/src/sys/ufs/ffs/ffs_softdep.c:1908
Mar 24 14:25:16  kernel: stack backtrace:
Mar 24 14:25:16  kernel: #0 0xb5c22421 at witness_debugger+0x81
Mar 24 14:25:16  kernel: #1 0xb5c22342 at witness_checkorder+0xd12
Mar 24 14:25:16  kernel: #2 0xb5b9b5d4 at __lockmgr_args+0xa64
Mar 24 14:25:16  kernel: #3 0xb5c784ad at vop_stdlock+0x4d
Mar 24 14:25:16  kernel: #4 0xb618e7f7 at VOP_LOCK1_APV+0xd7
Mar 24 14:25:16  kernel: #5 0xb5c9c137 at _vn_lock+0xb7
Mar 24 14:25:16  kernel: #6 0xb5e9d648 at softdep_flushworklist+0x68
Mar 24 14:25:16  kernel: #7 0xb5ebc892 at ffs_sync+0x2b2
Mar 24 14:25:16  kernel: #8 0xb5c82955 at dounmount+0x6c5
Mar 24 14:25:16  kernel: #9 0xb5c82185 at sys_unmount+0x315
Mar 24 14:25:16  kernel: #10 0xb6155fa5 at syscall+0x3b5
Mar 24 14:25:16  kernel: #11 0xb6140ede at Xint0x80_syscall+0x2e

umounting a sata filesystem, the above.  Useful?

aside: twice recently dropped to debugger upon shutdown.
kb>   [ or whatever ]
any useful commands here?
I thought 'st' but have not read about a procedure...

That occured upon umount of a 2nd sata disk's filesystem(s).

On a second note,
Received on Sat Mar 25 2017 - 12:00:26 UTC

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