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Date:      Thu, 4 Jan 2007 13:48:49 +0200
From:      Kostik Belousov <kostikbel@gmail.com>
To:        Eugene Grosbein <eugen@kuzbass.ru>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: WITNESS & RELENG_6
Message-ID:  <20070104114849.GH21325@deviant.kiev.zoral.com.ua>
In-Reply-To: <20070104114327.GA81011@svzserv.kemerovo.su>
References:  <20070103141820.GA1014@grosbein.pp.ru> <200701031601.05541.jhb@freebsd.org> <20070104040727.GD21325@deviant.kiev.zoral.com.ua> <20070104103708.GF21325@deviant.kiev.zoral.com.ua> <20070104105208.GA78979@svzserv.kemerovo.su> <20070104110208.GG21325@deviant.kiev.zoral.com.ua> <20070104114327.GA81011@svzserv.kemerovo.su>

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On Thu, Jan 04, 2007 at 06:43:27PM +0700, Eugene Grosbein wrote:
> On Thu, Jan 04, 2007 at 01:02:08PM +0200, Kostik Belousov wrote:
>=20
> > Hmm, it needs 1.198 as well. Below is aggregated patch against RELENG_6.
> >=20
> > Index: kern_conf.c
> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > RCS file: /usr/local/arch/ncvs/src/sys/kern/kern_conf.c,v
> > retrieving revision 1.186.2.7
> > diff -u -r1.186.2.7 kern_conf.c
> > --- kern_conf.c	30 Oct 2006 15:43:56 -0000	1.186.2.7
> > +++ kern_conf.c	4 Jan 2007 10:59:33 -0000
> > @@ -676,16 +676,20 @@
> >  		dev->si_flags &=3D ~SI_CLONELIST;
> >  	}
> > =20
> > +	dev->si_refcount++;	/* Avoid race with dev_rel() */
> >  	csw =3D dev->si_devsw;
> >  	dev->si_devsw =3D NULL;	/* already NULL for SI_ALIAS */
> >  	while (csw !=3D NULL && csw->d_purge !=3D NULL && dev->si_threadcount=
) {
> > -		printf("Purging %lu threads from %s\n",
> > -		    dev->si_threadcount, devtoname(dev));
> >  		csw->d_purge(dev);
> >  		msleep(csw, &devmtx, PRIBIO, "devprg", hz/10);
> > +		if (dev->si_threadcount)
> > +			printf("Still %lu threads in %s\n",
> > +			    dev->si_threadcount, devtoname(dev));
> > +	}
> > +	while (dev->si_threadcount !=3D 0) {
> > +		/* Use unique dummy wait ident */
> > +		msleep(&csw, &devmtx, PRIBIO, "devdrn", hz / 10);
> >  	}
> > -	if (csw !=3D NULL && csw->d_purge !=3D NULL)
> > -		printf("All threads purged from %s\n", devtoname(dev));
> > =20
> >  	dev->si_drv1 =3D 0;
> >  	dev->si_drv2 =3D 0;
> > @@ -700,6 +704,7 @@
> >  			fini_cdevsw(csw);
> >  	}
> >  	dev->si_flags &=3D ~SI_ALIAS;
> > +	dev->si_refcount--;	/* Avoid race with dev_rel() */
> > =20
> >  	if (dev->si_refcount > 0) {
> >  		LIST_INSERT_HEAD(&dead_cdevsw.d_devs, dev, si_list);
>=20
> I've tried. Now machine just hangs if I try to switch from X to vty.
> It stays in graphics mode locked.

Does it crash when exiting glxgears/some video player ?
When hangs, does it answer ping/allow ssh connections ?

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