Date: Thu, 4 Sep 2008 17:34:36 +0200 From: Ed Schouten <ed@80386.nl> To: ben wilber <ben@desync.com> Cc: freebsd-bugs@FreeBSD.org Subject: Re: kern/127054: [panic] perl causes panic Message-ID: <20080904153436.GU99951@hoeg.nl> In-Reply-To: <20080904094250.GA2825@exodus.desync.com> References: <200809031003.m83A3xAg069149@freefall.freebsd.org> <20080903112406.GO99951@hoeg.nl> <20080903144844.GP99951@hoeg.nl> <20080903202922.GA2753@exodus.desync.com> <20080904044829.GT99951@hoeg.nl> <20080904094250.GA2825@exodus.desync.com>
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Hello Ben,
* ben wilber <ben@desync.com> wrote:
> On Thu, Sep 04, 2008 at 06:48:29AM +0200, Ed Schouten wrote:
> > > #11 0xffffffff80524e3f in ptsdev_close (fp=3D0xffffff00057c5808, td=
=3DVariable "td" is not available.
> > > ) =20
> > > at /usr/src/sys/kern/tty_pts.c:436
>=20
> Sorry, I lost my dump again trying to make DDB scripts work. This is
> yet another new one.
It seems we're dealing with a very obscure case here:
> $4 =3D {t_mtx =3D 0xffffff000587c008, t_mtxobj =3D {lock_object =3D {
> lo_name =3D 0xffffffff808952c6 "tty lock", lo_flags =3D 16908288, l=
o_data =3D 0,=20
> lo_witness =3D 0x0}, mtx_lock =3D 6}, t_list =3D {tqe_next =3D 0x0,=
tqe_prev =3D 0xffffff000530d028},=20
> t_flags =3D 1543831584, t_revokecnt =3D 1, t_inq =3D {ti_list =3D {tqh_=
first =3D 0x0,=20
t_flags shouldn't be this high. Converted to hexadecimal, its value is
0x5c050020. The only valid flags here are TF_GONE|TF_EXCLUDE|TF_ZOMBIE.
> <snip>
> t_softc =3D 0xffffff001a30d100, t_dev =3D 0x0}
t_dev is 0, which means we're tearing down the TTY.
Have you got COMPAT_43TTY enabled in your kernel configuration file? If
so, can you reproduce the panic if COMPAT_43TTY is disabled? I think I
already see where the problem is. And yes, the bug is quite awful.
--=20
Ed Schouten <ed@80386.nl>
WWW: http://80386.nl/
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