Date: Thu, 16 Apr 2009 15:20:34 -0500 From: Robert Noland <rnoland@FreeBSD.org> To: John Baldwin <jhb@freebsd.org> Cc: deeptech71@gmail.com, freebsd-current@freebsd.org Subject: Re: diagnosing freezes (DRI?) Message-ID: <1239913234.1991.1.camel@balrog.2hip.net> In-Reply-To: <200904161116.58094.jhb@freebsd.org> References: <49E6ACEE.6080301@gmail.com> <200904161116.58094.jhb@freebsd.org>
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[-- Attachment #1 --] On Thu, 2009-04-16 at 11:16 -0400, John Baldwin wrote: > [ moved to current@ ] > > 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 > > conditions. > > Type "show copying" to see the conditions. > > > > There is absolutely no warranty for GDB. Type "show warranty" for > > details. > > This GDB was configured as "i386-marcel-freebsd"... > > [ snipped lots of stuff ] > > > Kernel page fault with the following non-sleepable locks held: > > > > exclusive sleep mutex drmdev (drmdev) r = 0 (0xc373f860) locked @ > > /usr/src/sys/modules/drm/drm/../../../dev/drm/drm_drv.c:777 > > > > KDB: stack backtrace: > > > > calltrap() at calltrap+0x6 > > > > --- trap 0xc, eip = 0xc0b611b6, esp = 0xd67d4a98, ebp = 0xd67d4b48 --- > > > > slow_copyin(c373f800,c4103300,c42e64e0,d67d4b64,0,...) at > > slow_copyin+0x6 > > radeon_cp_texture(c373f800,c42e64e0,c4103300,309,c0c26218,...) at > > radeon_cp_texture+0x199 > > > > drm_ioctl(c39d4e00,c018644e,c42e64e0,3,c40afaf0,...) at drm_ioctl+0x356 > > > > The drm code is doing a copyin() while holding a mutex (which is not allowed). Ok, the quick and dirty fix for this is http://people.freebsd.org/~rnoland/drm_radeon_state-copyin-fix.patch I think there may be other places of concern though and a more proper fix is needed. robert. -- Robert Noland <rnoland@FreeBSD.org> FreeBSD [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.11 (FreeBSD) iEYEABECAAYFAknnkxIACgkQM4TrQ4qfROMLawCeP2PeSvVBp9ZEYBxINY0Oxozc BoAAn15iz8xqwSFX+ww7k2A6+7p2GfcD =/Hii -----END PGP SIGNATURE-----
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