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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