[Bug 27536] Bus error 7 with todays DRT bisected.

[bugzilla-daemon@freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=27536

--- Comment #1 from Andy Furniss <lists@andyfurniss.entadsl.com> 2010-04-08 06:34:51 PDT ---
Card id rv670 AGP, running git xorg, ddx, mesa, libdrm and drt kernel.

Yesterdays DRT was fine for me, but after todays commits I am getting kicked
out of X with a backtrace that looks like below. The trace varies from 3 down
depending on what I was doing when triggering it, the one included was running
x11perf -putimage500.

I can't restart X after this a it just gets another signal 7.

Happens with both agp gart and pcie gart.

Git bisect came up with -

b562614485ca2247384f540c859e00357fe7adcb is first bad commit
commit b562614485ca2247384f540c859e00357fe7adcb
Author: Jerome Glisse <jglisse@redhat.com>
Date:   Wed Apr 7 10:21:24 2010 +0000

    drm/radeon/kms: add support for new fault callback V6

    This add the support for the new fault callback and also the
    infrastructure for supporting unmappable VRAM.

    V2 validate BO with no_wait = true
    V3 don't derefence bo->mem.mm_node as it's not NULL only for
       VRAM or GTT
    V4 update to splitted no_wait ttm change
    V5 update to new balanced io_mem_reserve/free change
    V6 callback is responsible for iomapping memory



[    68.793] 0: /home/andy/Src/Xorg-git/modular/bin/Xorg (xorg_backtrace+0x3b)
[0x80e05cb]
[    68.793] 1: /home/andy/Src/Xorg-git/modular/bin/Xorg (0x8048000+0x5a325)
[0x80a2325]
[    68.793] 2: (vdso) (__kernel_rt_sigreturn+0x0) [0xffffe40c]
[    68.793] 3: /home/andy/Src/Xorg-git/modular/lib/xorg/modules/libexa.so
(0xb71bc000+0x728e) [0xb71c328e]
[    68.793] 4: /home/andy/Src/Xorg-git/modular/bin/Xorg (0x8048000+0xce6da)
[0x81166da]
[    68.793] 5: /home/andy/Src/Xorg-git/modular/bin/Xorg (0x8048000+0x26274)
[0x806e274]
[    68.793] 6: /home/andy/Src/Xorg-git/modular/bin/Xorg (0x8048000+0x25110)
[0x806d110]
[    68.793] 7: /home/andy/Src/Xorg-git/modular/bin/Xorg (0x8048000+0x1a92c)
[0x806292c]
[    68.793] 8: /lib/libc.so.6 (__libc_start_main+0xd0) [0xb73b9380]
[    68.793] 9: /home/andy/Src/Xorg-git/modular/bin/Xorg (0x8048000+0x1a531)
[0x8062531]
[    68.793] Bus error at address 0xb6a80000
[    68.793] 
Fatal server error:
[    68.793] Caught signal 7 (Bus error). Server aborting

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