https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251320

--- Comment #2 from Tong Zhang <ztong0...@gmail.com> ---
(In reply to Konstantin Belousov from comment #1)


lock order reversal:
 1st 0xfffff80004da0258 ufs (ufs, lockmgr) @ /usr/src/sys/kern/vfs_mount.c:1739
 2nd 0xfffff80004da0070 devfs (devfs, lockmgr) @
/usr/src/sys/kern/vfs_subr.c:3135
lock order devfs -> ufs established at:
#0 0xffffffff80c47a2d at witness_checkorder+0x46d
#1 0xffffffff80ba8c98 at lockmgr_lock_flags+0x188
#2 0xffffffff80e998e5 at ffs_lock+0x75
#3 0xffffffff80cd22a4 at _vn_lock+0x54
#4 0xffffffff80cb19d5 at vfs_domount+0xee5
#5 0xffffffff80cb0122 at vfs_donmount+0x872
#6 0xffffffff80cb44e7 at kernel_mount+0x57
#7 0xffffffff80cb6e11 at parse_mount+0x4a1
#8 0xffffffff80cb5319 at vfs_mountroot+0x589
#9 0xffffffff80b680af at start_init+0x1f
#10 0xffffffff80b93e50 at fork_exit+0x80
#11 0xffffffff80ffaace at fork_trampoline+0xe
lock order ufs -> devfs attempted at:
#0 0xffffffff80c4838c at witness_checkorder+0xdcc
#1 0xffffffff80ba8c98 at lockmgr_lock_flags+0x188
#2 0xffffffff80cd22a4 at _vn_lock+0x54
#3 0xffffffff80cbb5d1 at vput_final+0x111
#4 0xffffffff80e9762f at ffs_unmount+0x33f
#5 0xffffffff80cb2abc at dounmount+0x42c
#6 0xffffffff80cb261c at kern_unmount+0x2fc
#7 0xffffffff8102715e at amd64_syscall+0x12e
#8 0xffffffff80ffa39e at fast_syscall_common+0xf8

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