diagnosing freezes (DRI?)
jhb at freebsd.org
Thu Apr 16 15:55:39 UTC 2009
[ moved to current@ ]
On Wednesday 15 April 2009 11:58:38 pm deeptech71 at 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
> Type "show copying" to see the conditions.
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> 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 @
> KDB: stack backtrace:
> calltrap() at calltrap+0x6
> --- trap 0xc, eip = 0xc0b611b6, esp = 0xd67d4a98, ebp = 0xd67d4b48 ---
> slow_copyin(c373f800,c4103300,c42e64e0,d67d4b64,0,...) at
> radeon_cp_texture(c373f800,c42e64e0,c4103300,309,c0c26218,...) at
> 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).
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