[Bug 29738] SIGBUS after upgrade to 2.6.36-rc1-git4 [full stacktrace]

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https://bugs.freedesktop.org/show_bug.cgi?id=29738

--- Comment #9 from Alexandre <alexandref75@xxxxxxxxx> 2010-08-26 00:33:25 PDT ---
In my bisect (I tried to reduce the number of tests) by restricting the commits
to the drivers/gpu/drm include/drm directories.

The commit I got is the one below. I am not 100% confident since getting the
good is difficult (the bad is easy) and some combinations keep getting a
different bug that is described below.

7a6b2896f261894dde287d3faefa4b432cddca53 is the first bad commit
commit 7a6b2896f261894dde287d3faefa4b432cddca53
Author: Daniel Vetter <daniel.vetter@xxxxxxxx>
Date:   Fri Jul 2 15:02:15 2010 +0100

    drm_mm: extract check_free_mm_node

    There are already two copies of this logic. And the new scanning
    stuff will add some more. So extract it into a small helper
    function.

    Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
    Acked-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
    Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
    Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>

:040000 040000 a1d9ede188db6c1fc721c526a56437758f213c35
fcc9ba1feccf51c5d078301a27e9ec41b0498adf M      drivers

In some cases I keep getting this error. The drm restarts. I do not know if
this error is masking the fatal error to occur. I do not see this error in
2.6.35 or 2.6.25.2.

[18090.916037] WARNING: at drivers/gpu/drm/radeon/radeon_fence.c:235
0xffffffff8138504a()
[18090.916040] Hardware name: Studio XPS 1640
[18090.916041] GPU lockup (waiting for 0x002D906A last fence id 0x002D9062)
Aug 25 20:06:58 becky3 kernel: [18090.916043] Modules linked in: mmc_block
aes_x86_64 aes_generic snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device
snd_pcm_oss snd_mixer_oss sco bnep rfcomm l2cap ipv6 acpi_cpufreq mperf btusb
bluetooth arc4 snd_hda_codec_atihdmi ecb snd_hda_codec_idt iwlagn snd_hda_intel
iwlcore snd_hda_codec snd_hwdep usbhid mac80211 uvcvideo snd_pcm snd_timer snd
videodev v4l2_compat_ioctl32 cfg80211 ehci_hcd uhci_hcd usbcore rtc_cmos
rtc_core sdhci_pci sdhci mmc_core dell_wmi dell_laptop processor snd_page_alloc
wmi ohci1394 video thermal joydev i2c_i801 rtc_lib rfkill led_class pcspkr sg
backlight output intel_agp ieee1394 thermal_sys dcdbas ac battery button
[18090.916092] Pid: 5449, comm: kwin Tainted: G        W   2.6.35-rc4+ #3
[18090.916094] Call Trace:
[18090.916098]  [<ffffffff8103a0ca>] 0xffffffff8103a0ca
[18090.916100]  [<ffffffff8103a1a1>] 0xffffffff8103a1a1
[18090.916102]  [<ffffffff8138504a>] 0xffffffff8138504a
[18090.916104]  [<ffffffff81051790>] ? 0xffffffff81051790
[18090.916106]  [<ffffffff8138593c>] 0xffffffff8138593c
[18090.916108]  [<ffffffff81350906>] 0xffffffff81350906
[18090.916110]  [<ffffffff8139aece>] 0xffffffff8139aece
[18090.916112]  [<ffffffff8133c3ea>] 0xffffffff8133c3ea
[18090.916114]  [<ffffffff8139ae40>] ? 0xffffffff8139ae40
[18090.916116]  [<ffffffff810c6e12>] ? 0xffffffff810c6e12
[18090.916119]  [<ffffffff810d5b18>] 0xffffffff810d5b18
[18090.916121]  [<ffffffff810d5cc0>] 0xffffffff810d5cc0
[18090.916123]  [<ffffffff810c7a70>] ? 0xffffffff810c7a70
[18090.916125]  [<ffffffff810d61aa>] 0xffffffff810d61aa
[18090.916127]  [<ffffffff81002ceb>] 0xffffffff81002ceb
[18090.916129] ---[ end trace cc0eb4d6579677d8 ]---
[18090.916136] [drm] Disabling audio support
[18090.917139] radeon 0000:01:00.0: ffff88013ef8ae00 unpin not necessary
[18090.917356] radeon 0000:01:00.0: GPU softreset
[18090.917359] radeon 0000:01:00.0:   R_008010_GRBM_STATUS=0xA23034E0
[18090.917361] radeon 0000:01:00.0:   R_008014_GRBM_STATUS2=0x00000003
[18090.917363] radeon 0000:01:00.0:   R_000E50_SRBM_STATUS=0x200010C0
[18090.917372] radeon 0000:01:00.0:   R_008020_GRBM_SOFT_RESET=0x00007FEE
[18090.932253] radeon 0000:01:00.0: R_008020_GRBM_SOFT_RESET=0x00000001
[18090.948123] radeon 0000:01:00.0:   R_008010_GRBM_STATUS=0x00003030
[18090.948125] radeon 0000:01:00.0:   R_008014_GRBM_STATUS2=0x00000003
[18090.948128] radeon 0000:01:00.0:   R_000E50_SRBM_STATUS=0x200000C0
[18090.949120] radeon 0000:01:00.0: GPU reset succeed
[18090.967247] [drm] Clocks initialized !
[18091.000606] [drm] ring test succeeded in 1 usecs
[18091.000616] [drm] ib test succeeded in 1 usecs
[18091.000619] [drm] Enabling audio support
[18094.508025] radeon 0000:01:00.0: GPU lockup CP stall for more than 1020msec

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