dmesg output I don't understand

Hello!

What do these lines in my dmesg mean?

I am on amd64.

/usr/src Revision: 338177

/usr/ports Revision: 477773

P.S

I got Fatal trap 12 with this revision after installing several fusefs
modules from ports.

After removing fuse from my loader.conf, things booted again.

Regards,

Per Gunnarsson

lock order reversal:
 1st 0xfffffe0000e82d80 bufwait (bufwait) _at_ /usr/src/sys/kern/vfs_bio.c:3916
 2nd 0xfffff80005787000 dirhash (dirhash) _at_
/usr/src/sys/ufs/ufs/ufs_dirhash.c:289
stack backtrace:
#0 0xffffffff80c02573 at witness_debugger+0x73
#1 0xffffffff80c023f4 at witness_checkorder+0xe34
#2 0xffffffff80b9fe68 at _sx_xlock+0x68
#3 0xffffffff80ec518d at ufsdirhash_add+0x3d
#4 0xffffffff80ec805f at ufs_direnter+0x49f
#5 0xffffffff80ed04f9 at ufs_mkdir+0x8b9
#6 0xffffffff81201479 at VOP_MKDIR_APV+0xd9
#7 0xffffffff80c7d5aa at kern_mkdirat+0x1ca
#8 0xffffffff8107ea21 at amd64_syscall+0x281
#9 0xffffffff81058d3d at fast_syscall_common+0x101
Security policy loaded: MAC/ntpd (mac_ntpd)
acquiring duplicate lock of same type: "os.lock_mtx"
 1st os.lock_mtx _at_ nvidia_os.c:886
 2nd os.lock_mtx _at_ nvidia_os.c:886
stack backtrace:
#0 0xffffffff80c02573 at witness_debugger+0x73
#1 0xffffffff80c023f4 at witness_checkorder+0xe34
#2 0xffffffff80b74cac at __mtx_lock_flags+0x9c
#3 0xffffffff82f9ad8b at os_acquire_spinlock+0x1b
#4 0xffffffff82e91adc at _nv032251rm+0xc
lock order reversal:
 1st 0xfffff8003033e068 ufs (ufs) _at_ /usr/src/sys/kern/vfs_subr.c:2590
 2nd 0xfffffe0001a84200 bufwait (bufwait) _at_
/usr/src/sys/ufs/ffs/ffs_vnops.c:282
 3rd 0xfffff80030340d88 ufs (ufs) _at_ /usr/src/sys/kern/vfs_subr.c:2590
stack backtrace:
#0 0xffffffff80c02573 at witness_debugger+0x73
#1 0xffffffff80c023f4 at witness_checkorder+0xe34
#2 0xffffffff80b6a2db at lockmgr_xlock_hard+0x6b
#3 0xffffffff80b6ace5 at __lockmgr_args+0x545
#4 0xffffffff80ebfe25 at ffs_lock+0xa5
#5 0xffffffff81201ef9 at VOP_LOCK1_APV+0xd9
#6 0xffffffff80c803e6 at _vn_lock+0x66
#7 0xffffffff80c6eccf at vget+0x7f
#8 0xffffffff80c60eb1 at vfs_hash_get+0xd1
#9 0xffffffff80ebb69f at ffs_vgetf+0x3f
#10 0xffffffff80eb10ed at softdep_sync_buf+0x5dd
#11 0xffffffff80ec0c04 at ffs_syncvnode+0x294
#12 0xffffffff80eb0308 at softdep_fsync+0x4c8
#13 0xffffffff80ebfcfc at ffs_fsync+0x7c
#14 0xffffffff81200e69 at VOP_FSYNC_APV+0xd9
#15 0xffffffff80c7cdd4 at kern_fsync+0x194
#16 0xffffffff8107ea21 at amd64_syscall+0x281
#17 0xffffffff81058d3d at fast_syscall_common+0x101
fuse-freebsd: version 0.4.4, FUSE ABI 7.8