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Date:      Fri, 17 Apr 2009 14:28:37 -0500
From:      Robert Noland <rnoland@FreeBSD.org>
To:        deeptech71@gmail.com
Cc:        freebsd-current@freebsd.org
Subject:   Re: diagnosing freezes (DRI?)
Message-ID:  <1239996517.24514.1.camel@balrog.2hip.net>
In-Reply-To: <49E7FED0.9090708@gmail.com>
References:  <49E6ACEE.6080301@gmail.com> <200904161116.58094.jhb@freebsd.org> <1239913234.1991.1.camel@balrog.2hip.net> <49E7FED0.9090708@gmail.com>

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On Fri, 2009-04-17 at 06:00 +0200, deeptech71@gmail.com wrote:
> Robert Noland wrote:
> > On Thu, 2009-04-16 at 11:16 -0400, John Baldwin wrote:
> >> On Wednesday 15 April 2009 11:58:38 pm deeptech71@gmail.com wrote:
> >>> I can reliably (~40%) reproduce a freeze, which I think is related.
> >>>
> >>> Using the GENERIC debug kernel built from SVN HEAD:
> >>>
> >>> # cd /usr/obj/usr/src/sys/GENERIC/
> >>> # kgdb kernel.debug /var/crash/vmcore.0
> >>> GNU gdb 6.1.1 [FreeBSD]
> >>> Copyright 2004 Free Software Foundation, Inc.
> >>> GDB is free software, covered by the GNU General Public License, and =
you are
> >>> welcome to change it and/or distribute copies of it under certain=20
> >>> conditions.
> >>> Type "show copying" to see the conditions.=20
> >>>
> >>> There is absolutely no warranty for GDB.  Type "show warranty" for=20
> >>> details.
> >>> This GDB was configured as "i386-marcel-freebsd"...=20
> >> [ snipped lots of stuff ]
> >>
> >>> Kernel page fault with the following non-sleepable locks held:=20
> >>>
> >>> exclusive sleep mutex drmdev (drmdev) r =3D 0 (0xc373f860) locked @=20
> >>> /usr/src/sys/modules/drm/drm/../../../dev/drm/drm_drv.c:777=20
> >>>
> >>> KDB: stack backtrace:=20
> >>>
> >>> calltrap() at calltrap+0x6=20
> >>>
> >>> --- trap 0xc, eip =3D 0xc0b611b6, esp =3D 0xd67d4a98, ebp =3D 0xd67d4=
b48 ---=20
> >>>
> >>> slow_copyin(c373f800,c4103300,c42e64e0,d67d4b64,0,...) at=20
> >>> slow_copyin+0x6
> >>> radeon_cp_texture(c373f800,c42e64e0,c4103300,309,c0c26218,...) at=20
> >>> radeon_cp_texture+0x199=20
> >>>
> >>> drm_ioctl(c39d4e00,c018644e,c42e64e0,3,c40afaf0,...) at drm_ioctl+0x3=
56=20
> >>>
> >> The drm code is doing a copyin() while holding a mutex (which is not a=
llowed).
> >=20
> > Ok, the quick and dirty fix for this is
> > http://people.freebsd.org/~rnoland/drm_radeon_state-copyin-fix.patch
> >=20
> > I think there may be other places of concern though and a more proper
> > fix is needed.
>=20
> I still get the same lockup :(

It can't be the same backtrace though... I'll get a more complete patch
put together shortly.

robert.

> _______________________________________________
> freebsd-current@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-current
> To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org=
"
--=20
Robert Noland <rnoland@FreeBSD.org>
FreeBSD

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