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

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

[bugzilla-daemon]

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

           Summary: SIGBUS after upgrade to 2.6.36-rc1-git4 [full
                    stacktrace]
           Product: DRI
           Version: XOrg CVS
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: entropy@everymail.net


Hi all,

I gave Linux 2.6.36-rc1-git4 a try today coming from 2.6.35.3.

Once in a while X crashes with an SIGBUS in pixman (0.18.4) [see the backtrace
attached].
I'm filing this bug here because it 'seems' that this is somehow connected
to the Kernel version as I was not able to reproduce this with 2.6.35.3.

I cannot provide a definite way to reproduce this issue. It happened during
different actions such as flickering through a PDF document and resizing an
mplayer window.

Keep up the excellent work!

-- system --

xorg-server-1.8.2

xf86-video-ati (git 08/22)
libdrm (git 08/22)

AMD Phenom(tm) II X4 940 Processor
AMD Radeon HD 4850

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[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 #1 from Till Matthiesen <entropy@everymail.net> 2010-08-22 14:33:40 PDT ---
Created an attachment (id=38076)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38076)
backtrace

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

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--- Comment #2 from Alexandre <alexandref75@gmail.com> 2010-08-23 08:54:34 PDT ---
Same error. It happens with xorg 1.9.0 and older versions but only with
2.6.36-rc1. All versions of 2.6.35 (including 2.6.35.2) work well, I could
never generate a bus error.

It sometimes happens within pixman but with me it is more common with this
backtrace.

Backtrace:
0: /usr/bin/X (xorg_backtrace+0x28) [0x4931a8]
1: /usr/bin/X (0x400000+0x5d979) [0x45d979]
2: /lib/libpthread.so.0 (0x7fe19e948000+0xf410) [0x7fe19e957410]
3: /lib/libc.so.6 (memcpy+0x67) [0x7fe19d931aa7]
4: /usr/lib64/xorg/modules/libfb.so (fbBlt+0x100) [0x7fe19b600350]
5: /usr/lib64/xorg/modules/libfb.so (fbBltStip+0x40) [0x7fe19b601080]
6: /usr/lib64/xorg/modules/libfb.so (fbPutZImage+0x1a2) [0x7fe19b605fd2]
7: /usr/lib64/xorg/modules/libexa.so (0x7fe19b3d6000+0x1245a) [0x7fe19b3e845a]
8: /usr/lib64/xorg/modules/libexa.so (0x7fe19b3d6000+0x960d) [0x7fe19b3df60d]
9: /usr/bin/X (0x400000+0xc3846) [0x4c3846]
10: /usr/bin/X (0x400000+0x381cb) [0x4381cb]
11: /usr/bin/X (0x400000+0x3a4b9) [0x43a4b9]
12: /usr/bin/X (0x400000+0x248ca) [0x4248ca]
13: /lib/libc.so.6 (__libc_start_main+0xfd) [0x7fe19d8cfd2d]
14: /usr/bin/X (0x400000+0x24469) [0x424469]
Bus error at address 0x7fe187df9000


Backtrace with pixman bus error
Backtrace:
0: /usr/bin/X (xorg_backtrace+0x28) [0x493148]
1: /usr/bin/X (0x400000+0x5d8c9) [0x45d8c9]
2: /lib/libpthread.so.0 (0x7fefb50d9000+0xf410) [0x7fefb50e8410]
3: /usr/lib/libpixman-1.so.0 (0x7fefb4e79000+0x51673) [0x7fefb4eca673]
4: /usr/lib/libpixman-1.so.0 (0x7fefb4e79000+0x51b1e) [0x7fefb4ecab1e]
5: /usr/lib/libpixman-1.so.0 (pixman_fill+0x3a) [0x7fefb4eaa9ea]
6: /usr/lib64/xorg/modules/libfb.so (fbFill+0x30c) [0x7fefb1d94ffc]
7: /usr/lib64/xorg/modules/libfb.so (fbPolyFillRect+0x1da) [0x7fefb1d9555a]
8: /usr/bin/X (0x400000+0x168cf0) [0x568cf0]
9: /usr/bin/X (0x400000+0x168eea) [0x568eea]
10: /usr/bin/X (miWideLine+0x1a7) [0x56ac17]
11: /usr/bin/X (miPolySegment+0x3f) [0x5490df]
12: /usr/lib64/xorg/modules/libexa.so (0x7fefb1b67000+0x137a9) [0x7fefb1b7a7a9]
13: /usr/bin/X (0x400000+0xc272d) [0x4c272d]
14: /usr/bin/X (0x400000+0x388a2) [0x4388a2]
15: /usr/bin/X (0x400000+0x3a4b9) [0x43a4b9]
16: /usr/bin/X (0x400000+0x248ca) [0x4248ca]
17: /lib/libc.so.6 (__libc_start_main+0xfd) [0x7fefb4060d2d]
18: /usr/bin/X (0x400000+0x24469) [0x424469]
Bus error at address 0x7fefaace4420

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[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 #3 from Alex Deucher <agd5f@yahoo.com> 2010-08-23 09:00:46 PDT ---
can you bisect the kernel to see what commit is causing the problem?

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

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--- Comment #4 from Alexandre <alexandref75@gmail.com> 2010-08-23 16:37:19 PDT ---
I will try to bisect. It will take a while because I still have not found a
consistent a way to trigger the bug.

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

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--- Comment #5 from Till Matthiesen <entropy@everymail.net> 2010-08-23 17:17:27 PDT ---
All I can tell so far is that it looks like this behaviour was introduced
somewhere between 2.6.35-git2 and 2.6.35-git3.

As Alexandre said, it is not straight forward to trigger.
I might (don't think so) have missed it in 2.6.35-git2 but X crashed with
2.6.35-git3 shortly after a few resizes of the mplayer window.

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

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--- Comment #6 from Till Matthiesen <entropy@everymail.net> 2010-08-24 13:29:05 PDT ---
Bisection pointed me to the merged drm-core-next branch which does not really
came unexpected.

commit fc1caf6eafb30ea185720e29f7f5eccca61ecd60
Merge: 9779714 96576a9
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Thu Aug 5 16:02:01 2010 -0700

    Merge branch 'drm-core-next' of
git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6

Can you tell me how I bisect such a branch?

As a side note - Xorg.0.log ends with the following message:
[   232.660] EXA bug: FinishAccess called without PrepareAccess for pixmap
0x0x1ed3b90.

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

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--- Comment #7 from Nick Bowler <nbowler@draconx.ca> 2010-08-25 15:36:08 PDT ---
(In reply to comment #6)
> Bisection pointed me to the merged drm-core-next branch which does not really
> came unexpected.
[...]
> Can you tell me how I bisect such a branch?

If the bisection pinpoints a merge, it _usually_ means that you mis-labeled an
earlier commit (although it is possible that the merge itself is actually the
culprit).  Unless you made a typo, all your 'bad' labels are likely correct.

So look at the output of 'git bisect log', and make a guess at which 'good'
commit might be mis-labeled (choose an older commit over a newer one if you're
unsure which to try first).  Check out that commit, and try again.  If it turns
out to be bad, you'll need to issue a 'git bisect bad' and then remove one or
more 'good' labels, see the git-bisect man page for details.

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

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--- Comment #8 from Till Matthiesen <entropy@everymail.net> 2010-08-25 17:57:35 PDT ---
You were perfectly right Nick. Thanks for the hint.

Finally, we have the commit that triggers the issue.

commit 709ea97145c125b3811ff70429e90ebdb0e832e5
Author: Daniel Vetter <daniel.vetter@ffwll.ch>
Date:   Fri Jul 2 15:02:16 2010 +0100

    drm: implement helper functions for scanning lru list

    These helper functions can be used to efficiently scan lru list
    for eviction. Eviction becomes a three stage process:
    1. Scanning through the lru list until a suitable hole has been found.
    2. Scan backwards to restore drm_mm consistency and find out which
       objects fall into the hole.
    3. Evict the objects that fall into the hole.

    These helper functions don't allocate any memory (at the price of
    not allowing any other concurrent operations). Hence this can also be
    used for ttm (which does lru scanning under a spinlock).

    Evicting objects in this fashion should be more fair than the current
    approach by i915 (scan the lru for a object large enough to contain
    the new object). It's also more efficient than the current approach used
    by ttm (uncoditionally evict objects from the lru until there's enough
    free space).

    Signed-Off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
    Acked-by: Thomas Hellstrom <thellstrom@vmwgfx.com>
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

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[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@gmail.com> 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@ffwll.ch>
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@ffwll.ch>
    Acked-by: Thomas Hellstrom <thellstrom@vmwgfx.com>
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

: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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[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

Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |mikko.cal@gmail.com

--- Comment #10 from Alex Deucher <agd5f@yahoo.com> 2010-08-26 08:01:25 PDT ---
*** Bug 29819 has been marked as a duplicate of this bug. ***

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

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--- Comment #11 from Daniel Vetter <daniel@ffwll.ch> 2010-08-26 12:37:10 PDT ---
Created an attachment (id=38195)
 View: https://bugs.freedesktop.org/attachment.cgi?id=38195
 Review: https://bugs.freedesktop.org/review?bug=29738&attachment=38195

fix range restriction checks in drm_mm

This patch should fix the problem. Please test.

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--- Comment #12 from Till Matthiesen <entropy@everymail.net> 2010-08-26 13:49:21 PDT ---
Thanks, Daniel.

I'm testing against rc2-git4 and it runs fine so far (~30 min),
doing all that 'stuff' that made it easily crash within 2-5 minutes.

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--- Comment #13 from Alexandre <alexandref75@gmail.com> 2010-08-26 17:41:29 PDT ---
Me too. Before you patch I was finishing testing with 2.6.36-rc2 with the two
previous patches removed and it worked fine. I am testing with your patch and
it works, I could not crash it. Thanks.

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Till Matthiesen <entropy@everymail.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED

--- Comment #14 from Till Matthiesen <entropy@everymail.net> 2010-08-27 02:31:59 PDT ---
I think we can consider this issue fixed.

Thanks again!

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Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |bugs.xorg@boris64.net

--- Comment #15 from Alex Deucher <agd5f@yahoo.com> 2010-09-10 08:29:29 PDT ---
*** Bug 30116 has been marked as a duplicate of this bug. ***

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--- Comment #16 from boris64 <bugs.xorg@boris64.net> 2010-09-10 08:48:32 PDT ---
I got this X crash on kernel-2.6.35.4
(-> https://bugs.freedesktop.org/show_bug.cgi?id=30116).
Is there a known patch that applies correctly to this kernel version?

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Tomasz Figa <tomasz.figa@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|FIXED                       |

--- Comment #17 from Tomasz Figa <tomasz.figa@gmail.com> 2010-09-14 06:44:23 PDT ---
I'm afraid that this problem persists. I'm getting random crashes with SIGBUS
signal on kernels from drm-radeon-testing and drm-fixes branches.

xorg-server git 09/13
xf86-video-ati git 09/13
libdrm git 09/13

Intel Core 2 Quad Q6600 Processor
AMD Radeon HD 5770

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--- Comment #18 from Tomasz Figa <tomasz.figa@gmail.com> 2010-09-14 06:46:15 PDT ---
Created an attachment (id=38690)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=38690)
Log from X.org X Server

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Tomasz Figa <tomasz.figa@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #38690|application/x-trash         |text/plain
          mime type|                            |

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--- Comment #19 from Tomasz Figa <tomasz.figa@gmail.com> 2010-09-14 07:55:09 PDT ---
After some additional testing, I can reproduce this bug by opening a PDF
document in Okular and scrolling through several pages back and forth, then
mouse cursor hangs and X server crashes.

Moreover, I can reproduce this bug with 2.6.35.4 kernel (with 2D corruption
patch applied, haven't tried without it yet).

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[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 #20 from Tomasz Figa <tomasz.figa@gmail.com> 2010-09-14 08:15:49 PDT ---
After disabling RenderAccel I can't reproduce the bug, but it disables the
acceleration and therefore can't be considered as a solution to the problem.

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[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 #21 from Daniel Vetter <daniel@ffwll.ch> 2010-09-14 09:26:09 PDT ---
Tomasz, can you please confirm that you're indeed still hitting this bug by
checking the that the comit that introduced the problem
(709ea97145c125b3811ff70429e90ebdb0e832e5) does not work, but its immediate
parent (7a6b2896f261894dde287d3faefa4b432cddca53) does work. If that's not the
case, your hitting a different problem, please then create a new bug to avoid
confusion.

Also please add your dmesg (after having crashed X).

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[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 #22 from Tomasz Figa <tomasz.figa@gmail.com> 2010-09-14 10:02:11 PDT ---
(In reply to comment #21)
> Tomasz, can you please confirm that you're indeed still hitting this bug by
> checking the that the comit that introduced the problem
> (709ea97145c125b3811ff70429e90ebdb0e832e5) does not work, but its immediate
> parent (7a6b2896f261894dde287d3faefa4b432cddca53) does work. If that's not the
> case, your hitting a different problem, please then create a new bug to avoid
> confusion.
> 
> Also please add your dmesg (after having crashed X).

I guess I'm hitting another problem. Commit
7a6b2896f261894dde287d3faefa4b432cddca53 doesn't work too, but it gives some
useful information in dmesg.

I'm opening a new bug then.

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[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 #23 from Maggioni Marcello <hayarms@gmail.com> 2010-10-05 17:42:51 PDT ---
Created an attachment (id=39199)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=39199)
Xorg backtrace

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

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--- Comment #24 from Alex Deucher <agd5f@yahoo.com> 2010-11-18 10:13:34 PST ---
This should be fixed in 2.6.36.

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[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

Alex Deucher <agd5f@yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|                            |FIXED

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