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Date:      Thu, 3 May 2001 10:57:24 -0400
From:      Chris Faulhaber <jedgar@fxp.org>
To:        Matthew Jacob <mjacob@feral.com>
Cc:        current@freebsd.org
Subject:   Re: lock order reversals, anyone?
Message-ID:  <20010503105724.A14089@peitho.fxp.org>
In-Reply-To: <Pine.BSF.4.21.0105030730150.91500-100000@beppo.feral.com>; from mjacob@feral.com on Thu, May 03, 2001 at 07:31:50AM -0700
References:  <Pine.BSF.4.21.0105030730150.91500-100000@beppo.feral.com>

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On Thu, May 03, 2001 at 07:31:50AM -0700, Matthew Jacob wrote:
>=20
> T-o-T about 24 hours ago:
>=20
> > lock order reversal
> >  1st lockmgr interlock last acquired @ /usr/src/sys/kern/kern_lock.c:239
> >  2nd 0xfffffe0025df8548 process lock @ /usr/src/sys/kern/kern_exit.c:542
> >  3rd 0xfffffe0000aab8d0 lockmgr interlock @
> /usr/src/sys/kern/kern_lock.c:239
> > acquiring duplicate lock of same type: "allproc"
> >  1st @ /usr/src/sys/kern/kern_proc.c:609
> >  2nd @ /usr/src/sys/kern/kern_proc.c:146
> > lock order reversal
> >  1st vnode interlock last acquired @ /usr/src/sys/ufs/ffs/ffs_vfsops.c:=
397
> >  2nd 0xfffffc000080f218 mntvnode @ /usr/src/sys/ufs/ffs/ffs_vfsops.c:464
> >  3rd 0xfffffe0026918080 vnode interlock @ /usr/src/sys/kern/vfs_subr.c:=
1881
> > pid 288 (nsrexecd), uid 0: exited on signal 11 (core dumped)
>=20
> (oh, yeah, a 4.1 built executable is dying, charming)
>=20

Don't know about your 4.1 executable, but the lock order reversals
are a well known issue:

http://www.FreeBSD.org/cgi/getmsg.cgi?fetch=3D161827+165415+/usr/local/www/=
db/text/2001/freebsd-current/20010429.freebsd-current

and

http://www.FreeBSD.org/cgi/getmsg.cgi?fetch=3D91622+94620+/usr/local/www/db=
/text/2001/freebsd-current/20010422.freebsd-current


--=20
Chris D. Faulhaber - jedgar@fxp.org - jedgar@FreeBSD.org
--------------------------------------------------------
FreeBSD: The Power To Serve   -   http://www.FreeBSD.org

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