https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=136944

[email protected] changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |[email protected]

--- Comment #5 from [email protected] ---
Just encountered this on a 12.2/amd64 vm while investigating #244048 (not sure
wether this might be part of the cause for that).

Of course, after so many years, the stack trace is slightly different.

Jan 12 14:05:13 mksnap kernel: lock order reversal:
Jan 12 14:05:13 mksnap kernel:  1st 0xfffffe0000827230 bufwait (bufwait) @
/usr/src/sys/ufs/ffs/ffs_vnops.c:283
Jan 12 14:05:13 mksnap kernel:  2nd 0xfffff800049661b0 snaplk (snaplk) @
/usr/src/sys/ufs/ffs/ffs_snapshot.c:2314
Jan 12 14:05:13 mksnap kernel: stack backtrace:
Jan 12 14:05:13 mksnap kernel: #0 0xffffffff80604bb3 at witness_debugger+0x73
Jan 12 14:05:13 mksnap kernel: #1 0xffffffff806048fe at
witness_checkorder+0xa9e
Jan 12 14:05:13 mksnap kernel: #2 0xffffffff8056c0ed at lockmgr_xlock_hard+0x6d
Jan 12 14:05:13 mksnap kernel: #3 0xffffffff8056d0d0 at __lockmgr_args+0x7a0
Jan 12 14:05:13 mksnap kernel: #4 0xffffffff807a0df6 at ffs_copyonwrite+0x176
Jan 12 14:05:13 mksnap kernel: #5 0xffffffff807c223c at ffs_geom_strategy+0x8c
Jan 12 14:05:13 mksnap kernel: #6 0xffffffff807d39c3 at ufs_strategy+0x83
Jan 12 14:05:13 mksnap kernel: #7 0xffffffff808b9911 at VOP_STRATEGY_APV+0xf1
Jan 12 14:05:13 mksnap kernel: #8 0xffffffff80647114 at bufstrategy+0x44
Jan 12 14:05:13 mksnap kernel: #9 0xffffffff80646fb0 at bufwrite+0x230
Jan 12 14:05:13 mksnap kernel: #10 0xffffffff807c406e at ffs_syncvnode+0x2be
Jan 12 14:05:13 mksnap kernel: #11 0xffffffff8079bd04 at ffs_snapshot+0x914
Jan 12 14:05:13 mksnap kernel: #12 0xffffffff807bfe5a at ffs_mount+0xb3a
Jan 12 14:05:13 mksnap kernel: #13 0xffffffff80661a54 at vfs_domount+0x8d4
Jan 12 14:05:13 mksnap kernel: #14 0xffffffff80660b27 at vfs_donmount+0x7e7
Jan 12 14:05:13 mksnap kernel: #15 0xffffffff80660312 at sys_nmount+0xf2
Jan 12 14:05:13 mksnap kernel: #16 0xffffffff808418b7 at amd64_syscall+0x2e7
Jan 12 14:05:13 mksnap kernel: #17 0xffffffff808193de at
fast_syscall_common+0xf8

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