duplicate lock of same type: "vnode interlock"

[Kostik Belousov]

On Fri, Sep 21, 2007 at 10:44:19PM +0400, Boris Samorodov wrote:
> Hi!
> 
> Today at:
> # uname -a
> FreeBSD test.ipt.ru 7.0-CURRENT FreeBSD 7.0-CURRENT #3: Fri Sep 21 18:36:28 MSD 2007     bsam at test.ipt.ru:/usr/obj/usr/src/sys/TEST  amd64
> 
> I've got:
> -----
> Mounting local file systems:acquiring duplicate lock of same type: "vnode interlock"
>  1st vnode interlock @ /usr/src/sys/kern/vfs_vnops.c:807
>  2nd vnode interlock @ /usr/src/sys/kern/vfs_subr.c:2081
> KDB: stack backtrace:
> db_trace_self_wrapper() at db_trace_self_wrapper+0x2a
> witness_checkorder() at witness_checkorder+0x5f8
> _mtx_lock_flags() at _mtx_lock_flags+0x75
> vrefcnt() at vrefcnt+0x31
> null_checkvp() at null_checkvp+0x1d
> null_lock() at null_lock+0x5b
> VOP_LOCK1_APV() at VOP_LOCK1_APV+0x79
> _vn_lock() at _vn_lock+0x94
> nullfs_root() at nullfs_root+0x59
> vfs_donmount() at vfs_donmount+0x1150
> nmount() at nmount+0x97
> syscall() at syscall+0x1f6
> Xfast_syscall() at Xfast_syscall+0xab
> --- syscall (378, FreeBSD ELF64, nmount), rip = 0x80068465c, rsp = 0x7fffffffe518, rbp = 0x7fffffffe520 ---
> -----
> 
> Should I worry about it?
No.

> The system boots and seems to we fine...
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