[Bug 251731] LOR between zfs and devfs

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251731

            Bug ID: 251731
           Summary: LOR between zfs and devfs
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: juraj at lutter.sk

Hi,

there is this LOR happening in recent -CURRENT (with GENERIC kernel):


lock order reversal:
 1st 0xfffff82d727e1258 zfs (zfs, lockmgr) @
/usr/src-cur/sys/kern/vfs_mount.c:1016
 2nd 0xfffff82cb9a6b628 devfs (devfs, lockmgr) @
/usr/src-cur/sys/kern/vfs_mount.c:1027
lock order devfs -> zfs established at:
#0 0xffffffff80c510ed at witness_checkorder+0x46d
#1 0xffffffff80bb43f5 at lockmgr_xlock+0x55
#2 0xffffffff80cdb604 at _vn_lock+0x54
#3 0xffffffff80cbadd8 at vfs_domount+0xe68
#4 0xffffffff80cb95a2 at vfs_donmount+0x872
#5 0xffffffff80cbd8c7 at kernel_mount+0x57
#6 0xffffffff80cc01f1 at parse_mount+0x4a1
#7 0xffffffff80cbe6f9 at vfs_mountroot+0x589
#8 0xffffffff80b73eff at start_init+0x1f
#9 0xffffffff80b9dbe0 at fork_exit+0x80
#10 0xffffffff8100968e at fork_trampoline+0xe
lock order zfs -> devfs attempted at:
#0 0xffffffff80c51a4c at witness_checkorder+0xdcc
#1 0xffffffff80bb43f5 at lockmgr_xlock+0x55
#2 0xffffffff80cdb604 at _vn_lock+0x54
#3 0xffffffff80cbadd8 at vfs_domount+0xe68
#4 0xffffffff80cb95a2 at vfs_donmount+0x872
#5 0xffffffff80cb8cf9 at sys_nmount+0x69
#6 0xffffffff81035d1b at amd64_syscall+0x12b
#7 0xffffffff81008f5e at fast_syscall_common+0xf8

Is this a known issue?

Thanks.

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