acquiring duplicate lock of same type: "vnode interlock"

[Ariff Abdullah]

I think I've read somewhere about panic during early root mount, fsck
etc.. Perhaps this might be related:

Full dmesg: http://people.freebsd.org/~ariff/misc/dmesg.boot.amd64

[....]
acquiring duplicate lock of same type: "vnode interlock"
 1st vnode interlock @ kern/vfs_vnops.c:791
 2nd vnode interlock @ kern/vfs_subr.c:2018
KDB: stack backtrace:
witness_checkorder() at witness_checkorder+0x4da
_mtx_lock_flags() at _mtx_lock_flags+0x4a
vrefcnt() at vrefcnt+0x31
null_checkvp() at null_checkvp+0x65
null_lock() at null_lock+0x5b
VOP_LOCK_APV() at VOP_LOCK_APV+0x81
vn_lock() at vn_lock+0x6b
nullfs_root() at nullfs_root+0x4c
vfs_donmount() at vfs_donmount+0x1096
nmount() at nmount+0x82
syscall() at syscall+0x21b
Xfast_syscall() at Xfast_syscall+0xa8
--- syscall (378, FreeBSD ELF64, nmount), rip = 0x800679e8c, rsp =
0x7fffffffe558, rbp = 0x7fffffffee40 ---


--
Ariff Abdullah
FreeBSD
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