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Date:      Fri, 21 Sep 2007 21:50:50 +0300
From:      Kostik Belousov <kostikbel@gmail.com>
To:        Boris Samorodov <bsam@ipt.ru>
Cc:        freebsd-current@freebsd.org
Subject:   Re: duplicate lock of same type: "vnode interlock"
Message-ID:  <20070921185050.GL79542@deviant.kiev.zoral.com.ua>
In-Reply-To: <96913676@srv.sem.ipt.ru>
References:  <96913676@srv.sem.ipt.ru>

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On Fri, Sep 21, 2007 at 10:44:19PM +0400, Boris Samorodov wrote:
> Hi!
>=20
> 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@test.ipt.ru:/usr/obj/usr/src/sys/TEST  amd64
>=20
> 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 =3D 0x80068465c, rsp =3D 0x=
7fffffffe518, rbp =3D 0x7fffffffe520 ---
> -----
>=20
> Should I worry about it?
No.

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

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