From owner-freebsd-current  Sun Mar 17 22:23:15 2002
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Date: Sun, 17 Mar 2002 22:23:09 -0800
From: Kris Kennaway <kris@obsecurity.org>
To: Alfred Perlstein <alfred@freebsd.org>
Cc: Dag-Erling Smorgrav <des@ofug.org>,
	Kris Kennaway <kris@obsecurity.org>, current@freebsd.org,
	fs@freebsd.org
Subject: Re: panic: bwrite: buffer is not busy???
Message-ID: <20020317222309.A45621@xor.obsecurity.org>
References: <20020317124958.A34008@xor.obsecurity.org> <xzpadt6r1xr.fsf@flood.ping.uio.no> <20020318061739.GB894@elvis.mu.org>
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In-Reply-To: <20020318061739.GB894@elvis.mu.org>; from alfred@freebsd.org on Sun, Mar 17, 2002 at 10:17:39PM -0800
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On Sun, Mar 17, 2002 at 10:17:39PM -0800, Alfred Perlstein wrote:
> * Dag-Erling Smorgrav <des@ofug.org> [020317 19:27] wrote:
> >=20
> > ...the process has no open files at all, because...
> >=20
> > (kgdb) p p->p_pid
> > $4 =3D 10099
> > (kgdb) p p->p_comm
> > $5 =3D "wc\000oot", '\000' <repeats 13 times>
> > (kgdb) p p->p_stat
> > $6 =3D 3
> > (kgdb) p/x p->p_flag
> > $7 =3D 0x6000
> >=20
> > ...it's exiting, and fdfree() has already run.
> >=20
> > Solution: p->p_fd must be protected by p's proc lock; fdfree() must
> > set it to NULL immediately after freeing it; checkdirs() must lock
> > each process before examining its fd list.
> >=20
> > Other problem spotted while investigating this: fdfree() can fail
> > silently; fdfree() should panic if fdp->fd_refcnt is non-zero.
>=20
> Please let me know if this works for you.

Thanks, will test once the current run is finished.

Kris

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