[Bug 14535] Memory corruption detected in low memory

[Bug 14535] Memory corruption detected in low memory

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Henrique de Moraes Holschuh <hmh@hmh.eng.br> changed:

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--- Comment #2 from Henrique de Moraes Holschuh <hmh@hmh.eng.br>  2010-01-03 16:22:53 ---
We have multiple reports of filesystem corruption on DRI radeon.  Kernels
2.6.30 and later with mesa 7.6 (galium disabled) cause the issue.  Kernel
2.6.30 with mesa 2.5 doesn't cause the issue.

It is likely this bug.

What is the status of this issue?  It causes filesystem corruption and data
loss, so it is a very nasty one.

Related (gives more data about the bug, and the reporter is a potential tester
for fixes):
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=550977

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Torsten Landschoff <torsten@debian.org> changed:

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--- Comment #3 from Torsten Landschoff <torsten@debian.org>  2010-01-09 23:03:45 ---
I still have this problem as well, but I originally ran into this with a 2.6.24
kernel (with OpenVZ support). I first blamed it on my old + patched kernel, but
upgrading the kernel did not resolve the problems.

So I'd expect it to be either a bug in Mesa or some kernel bug only exposed
with latest Mesa changes.

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Alex Deucher <alexdeucher@gmail.com> changed:

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--- Comment #4 from Alex Deucher <alexdeucher@gmail.com>  2010-01-11 14:36:33 ---
Can you try mesa git master or the 7.7 branch?  Dave fixed some potential
issues there:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=554043bff72ced41b2a5e03e61cbc087bb41bd3d
http://cgit.freedesktop.org/mesa/mesa/commit/?id=42f2880ffd0b847df7cb56b7f7f0747287e0b08f

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Gary <gary.pajer@gmail.com> changed:

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--- Comment #5 from Gary <gary.pajer@gmail.com>  2010-01-17 23:51:15 ---
I tried mesa 7.7 on Kubuntu 9.10, kernel 2.6.31-17, and the bug persists there.
See details in Ubuntu bug report #474928:
https://bugs.launchpad.net/ubuntu/+source/mesa/+bug/474928?comments=all

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Dave Airlie <airlied@linux.ie> changed:

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--- Comment #6 from Dave Airlie <airlied@linux.ie>  2010-01-18 00:29:58 ---
did you confirm the patches were in that build?

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--- Comment #7 from Gary <gary.pajer@gmail.com>  2010-01-18 00:59:09 ---
No.  I didn't know to do that.  How can I check?

In the meantime, I also tried mesa 7.6.0 (default Ubuntu 9.10 package) with
kernel 2.6.32-02063203-generic.  No change.

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--- Comment #8 from erki85@ut.ee  2010-01-18 14:29:19 ---
Tried mesa-git (+ati-dri-git and libgl-git) with xf86-video-ati-git today. Xorg
1.7.3.902.

With KMS enabled, glxgears's gears are red and green again (no blue) and
running etracer just produces blank screen. Although I can restart X and
continue normal working.

With KMS disabled, glxgears does not display error message about radeon_tcl.c
anymore, but running etracer locks up the system. I can sort of see the first
screen, which has "Press any key to continue", but the rest that should be
there is garbled. When I press any key X stops and I cannot close it. REISUB
works though this time (didn't before).

When I ran HOMM4 in wine, I got the usual Memory corruption detected in low
memory thingie. Couldn't restart X, couldn't REISUB.

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Shyouzou Sugitani <shy@m3.catvmics.ne.jp> changed:

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--- Comment #9 from Shyouzou Sugitani <shy@m3.catvmics.ne.jp>  2010-01-19 01:26:24 ---
I tried mesa 7.7-1(from Debian experimental) on Debian sid with kerenl
2.6.32-tr
unk-686.

With RV200(uses R100 microcode) glxgears and etracer works fine.(No system lock
up.)
But with RV280(uses R200 microcode) glxgears locks up the system.

I also tried mesa 7.6.1-1(from Debian sid).
With both RV200 and RV280 glxgears locks up the system.

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[Bug 14535] Memory corruption detected in low memory

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--- Comment #10 from Julien Cristau <jcristau@debian.org>  2010-01-19 01:32:55 ---
> --- Comment #9 from Shyouzou Sugitani <shy@m3.catvmics.ne.jp>  2010-01-19 01:26:24 ---
> I tried mesa 7.7-1(from Debian experimental) on Debian sid with kerenl
> 2.6.32-tr
> unk-686.

fwiw these mesa packages are built from mesa_7_7_branch commit 6d6c9c66.

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--- Comment #11 from erki85@ut.ee  2010-01-19 01:38:38 ---
Tried 2.6.33-rc4 with same software as in my previous comment and now
everything seems to be a bit better.

KMS works, glxgears has normal colours again, couldn't test wine+HOMM though
because it didn't start working. Hitman2 worked though. Etracer started
normally, but when clicking Play button, it exited with "drmRadeonCmdBuffer:
-12. Kernel failed to parse or rejected command stream. See dmesg for more
info.", dmesg says "[drm:radeon_cs_ioctl] *ERROR* Failed to parse relocation
!".

But haven't yet got memory or fs corruption with that setup.

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--- Comment #12 from erki85@ut.ee  2010-01-19 01:53:26 ---
Although with KMS disabled etracer first screen still doesn't look normal and
after keypress system hangs (REISUB out, no corruption).

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--- Comment #13 from erki85@ut.ee  2010-01-19 02:19:30 ---
Actually never mind my last two comments. Turns out that the difference was in
early and late start KMS. So it seems like kernel upgrade did not change
anything either.

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--- Comment #14 from Gary <gary.pajer@gmail.com>  2010-01-19 15:42:27 ---
Has anyone had success by reducing color depth to 16?  I just did that, and I
got rid of (when runnting glxgears):

*********************************WARN_ONCE*********************************
File radeon_tcl.c function radeon_run_tcl_render line 499
Rendering was 405 commands larger than predicted size. We might overflow 
command buffer.
***************************************************************************

Honestly, I'm afraid to run googleearth.  I've fsck'ed the system so many times
... I'm worried that my nine lives may have run out.  :)

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--- Comment #15 from Gary <gary.pajer@gmail.com>  2010-01-19 16:01:48 ---
Additional Comment to #14:
Here's the relevant part of my xorg.conf

Section "Monitor"
        Identifier   "Monitor0"
        VendorName   "Monitor Vendor"
        ModelName    "Monitor Model" 
EndSection                           

Section "Device"
        Identifier  "Card0"                                          
        Driver      "radeon"                                         
        VendorName  "ATI Technologies Inc"                           
        BoardName   "Radeon Mobility M7 LW [Radeon Mobility 7500]"   
        BusID       "PCI:1:0:0"                                      
        Option          "AccelMethod"           "EXA"                
        Option          "DRI"                   "true"               
EndSection                                                           


Section "Screen"
        Identifier      "Screen0"
        Monitor         "Monitor0"
        Device          "Card0"   

        Defaultdepth    16
        Virtual         1024 768
EndSection

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Simon Csaba Endre <secsaba@gmail.com> changed:

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--- Comment #16 from Simon Csaba Endre <secsaba@gmail.com>  2010-02-20 11:38:47 ---
Same corrupted filesystem problem with Radeon Mobility 7500 on a Thinkpad T42
laptop:
kernel - 2.6.32
mesa - 7.7
xf86-video-ati - 6.12.4
ati-dri - 7.7

bpp 16 will cause a very dim display but with a fully bright cursor and still
the problem is there.
bpp 15 the problem is gone but video players displays only a green window.

IMHO this is a SEVERE bug and a big regression if an user space graphical
application overwritting the memory causing filesystem corruption can put on
knee the whole system.

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Julien Cristau <jcristau@debian.org> changed:

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--- Comment #21 from Julien Cristau <jcristau@debian.org>  2010-02-22 13:44:21 ---
(In reply to comment #20)
> I've tried to reproduce this locally and haven't had any luck using Fedora
> running in user mode setting. It would help if someone could try with an old
> kernel and see it still happens.
> 
The user at http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=550562#136 reports
kernel BUGs with 2.6.26 and mesa 7.6 (log excerpt at
http://bugs.debian.org/cgi-bin/bugreport.cgi?msg=136;filename=kernel.oops;att=1;bug=550562).
I've asked him to try drm-radeon-testing.

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--- Comment #22 from Dave Airlie <airlied@linux.ie>  2010-02-23 00:35:20 ---
is anyone who is seeing this using page flipping?

I'm still not having any luck here reproducing it on an T42 with mesa 7.6.1
from the branch, 2.6.32.3 kernel

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--- Comment #23 from Dave Airlie <airlied@linux.ie>  2010-02-23 01:32:29 ---
It would be really nice if the people seeing hangs and crashes that aren't

(a) filesystem corruption
(b) low memory corruption

could not talk about it any more.

Then it would really help if we can get someone running

git version of the kernel (prefereably from drm-radeon-testing)
libdrm/mesa from git master
ati ddx from git master

to reproduce either issue a or b with open software (i.e. Windows games aren't
something I own). Then tell me what you did and I'll go figure it out.

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--- Comment #24 from Gary <gary.pajer@gmail.com>  2010-02-23 15:13:46 ---
I'm more than willing to help, but I need some help with implementation and
reporting.  And it'll take a couple of days to find time.

Me, summary:  Kubuntu 9.10,  Thinkpad T41, Radeon Mobility 7500. Excerpt from
xorg.conf in Comment #15 above. I've tried mesa 7.6.0, 7.7, and 7.5, and
kernels 2.6.32, 2.6.31-19, 2.6.31-14.  Mostly from packages that someone else
compiled, and not every possible combination.  I get file system corruption
almost always.  The exception: Mesa 7.5 appears to be corruption-free, but it
introduced something annoying but unrelated to this issue ... can't recall what
right now.  I'm considering downgrading to 7.5 again.

1. Page flipping:  I'm using EXA, so I think that means no page flipping.
2. Need an open app?  I've gotten crashes with just about every 3D program I've
tried.  For testing, I've been using google earth and vpython
(www.vpython.org). I'll find another if you want.

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--- Comment #25 from Dave Airlie <airlied@linux.ie>  2010-02-24 00:50:00 ---
okay I've reproduced it with Google earth thanks to Gary for pointing it out.

I've tested on drm-radeon-testing and it doesn't happen so the upstream fixes
for the buffer allocation failing must have fixed it however that patch is
majorly intrusive so I'll see if I can actaully figure out what is going wrong
and fix that for stable.

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--- Comment #26 from Dave Airlie <airlied@linux.ie>  2010-02-24 07:23:27 ---
Created an attachment (id=25180)
 --> (http://bugzilla.kernel.org/attachment.cgi?id=25180)
kernel patch to block bad behaviour

Block the badness from mesa.

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--- Comment #27 from Dave Airlie <airlied@linux.ie>  2010-02-24 07:24:12 ---
please test the patch in #26, it shuold fix it, not even d-r-t fixes it as
previously reported.

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--- Comment #28 from Simon Csaba Endre <secsaba@gmail.com>  2010-02-24 07:33:28 ---
Dave also xscreensaver-demo is causing file-system corruption. Is this kernel
patch fixing this issue also? Does this patch will be applied to the 2.6.32
kernel? As Arch Linux is a rolling distro I can try it if so.

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--- Comment #29 from Dave Airlie <airlied@linux.ie>  2010-02-24 09:25:42 ---
mesa fixes are now in the mesa master and mesa 7.7 branches.

Simon in comment #28, yes any GL app that causes low memory corruption should
be fixed by this. It'll go in to stable kernel as well once I push it.

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--- Comment #30 from Henrique de Moraes Holschuh <hmh@hmh.eng.br>  2010-02-24 17:16:54 ---
Ouch.

Dave,

Is there any possibility of userspace-generated content (GL requests, textures,
whatever) influence the bogus DMA details, so that it could be used to, e.g.,
overwrite specific areas of memory?

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[Bug 14535] Memory corruption detected in low memory

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http://bugzilla.kernel.org/show_bug.cgi?id=14535





--- Comment #31 from Alex Deucher <alexdeucher@gmail.com>  2010-02-24 17:24:59 ---
The drm has a command stream checker to keep this from happening, but there can
be obscure cases like this one that are not immediately obvious.

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[Bug 14535] Memory corruption detected in low memory

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https://bugzilla.kernel.org/show_bug.cgi?id=14535


Atif Amin <matifamin@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |matifamin@gmail.com

razamatan@hotmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |razamatan@hotmail.com




--- Comment #32 from Atif Amin <matifamin@gmail.com>  2010-05-09 15:05:50 ---
give me the drum -s report so that i can investigate internal of hardware
structure...

Your DMA controller might be doing some wrong work..
waiting for your Response

--- Comment #33 from razamatan@hotmail.com  2011-07-21 08:42:45 ---
i just noticed this behavior on 2.6.38 and 2.6.39 from my gentoo box.  i have
an rs690 chipset, run kms, use the radeon kernel drivers and run compiz on
xorg.

b/c i run compiz, all i have to do is be in an X session and do stuff and
eventually my root partition (ext3, but moved to ext4 after trying to reformat
after a full wipe of the disk... i was worried the disk was going bad) gets
corrupted.  i'm completely new to debugging issues at this level, so please
advise for what you guys need.

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[Bug 14535] Memory corruption detected in low memory

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Alan <alan@lxorguk.ukuu.org.uk> changed:

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




--- Comment #34 from Alan <alan@lxorguk.ukuu.org.uk>  2012-06-14 16:43:57 ---
Closing as fixed as the original bug filed here was fixed

razamatan - if your bug is still present please open a new bug

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Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED
         Resolution|OBSOLETE                    |CODE_FIX




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