Date: Thu, 16 Apr 2009 11:16:57 -0400 From: John Baldwin <jhb@freebsd.org> To: deeptech71@gmail.com Cc: freebsd-current@freebsd.org, rnoland@freebsd.org Subject: Re: diagnosing freezes (DRI?) Message-ID: <200904161116.58094.jhb@freebsd.org> In-Reply-To: <49E6ACEE.6080301@gmail.com> References: <49E6ACEE.6080301@gmail.com>
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[ 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). -- John Baldwin
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