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Thread-Topic: Fxp / polling / witness panic
Thread-Index: AcMVgnKfgBG/uVrrTnWnXWhU2QMndQAAK5Kg
From: "Robin P. Blanchard" <Robin.Blanchard@gactr.uga.edu>
To: "John Baldwin" <jhb@FreeBSD.org>
cc: current@freebsd.org
Subject: RE: Fxp / polling / witness panic
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> >#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:238
> > 238             dumping++;
> > (kgdb) bt
> >#0  doadump () at /usr/src/sys/kern/kern_shutdown.c:238
> >#1  0xc01d8133 in boot (howto=3D256) at=20
> >/usr/src/sys/kern/kern_shutdown.c:370
> >#2  0xc01d847b in panic () at /usr/src/sys/kern/kern_shutdown.c:543
> >#3  0xc01fb681 in witness_lock (lock=3D0xc1526160, flags=3D8,=20
> >     file=3D0xc0308197 "/usr/src/sys/dev/fxp/if_fxp.c", line=3D1465)
> >     at /usr/src/sys/kern/subr_witness.c:722
>=20
> What is the actual panic?
>=20
> Is it this one?
>=20
> KASSERT((lock1->li_lock->lo_flags & LO_WITNESS) =3D=3D 0,
>     ("lock missing witness structure"));
>=20
> Looks like the lock may be used after it was destroyed or some such.


Yep. That would be the one.