[Bug 16376] New: random - possibly Radeon DRM KMS related - freezes

[Bug 16376] New: random - possibly Radeon DRM KMS related - freezes

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=16376

           Summary: random - possibly Radeon DRM KMS related - freezes
           Product: Drivers
           Version: 2.5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
        AssignedTo: drivers_video-dri@kernel-bugs.osdl.org
        ReportedBy: Martin@Lichtvoll.de
        Regression: Yes


Affected kernel versions:
- 2.6.34-tp42-toi-3.1-04981-gb9a071a
- 2.6.34.1-tp42-toi-3.1.1.1-04990-g3a7d1f4

Last kernel that worked:
- 2.6.33.2-tp42-toi-3.1-lowmem-free-991-992-04964-gf00c7ec-dirty (including
some patches to explicitely allow freeing lowmem pages on hibernation - I
tested them for Nigel)

Currently running kernel:
- 2.6.33.6-tp42-toi-3.1.1.1-04982-g768d8a0

All from Nigel Cunnigham's TuxOnIce trees, but hangs happened before any
hibernation cycle took place.

So now I just report this although I do not have much information about the
circumstances of these hangs.

With 2.6.34 I had two and with 2.6.34.1 I had one sudden freeze of at least the
desktop on my ThinkPad T42 with Radeon graphics. Mouse pointer just froze,
Ctrl-Alt-F1 did nothing and AFAIR also there was no disk I/O anymore. I am not
completely sure about the last one. Since the freezes happened in quite
unpleasant circumstances I did not bother to start up a second machine in order
to try to SSH into my T42. With 2.6.33.2 I did not experience those freezes.

I used the tuxonice-2.6.34 tree from Nigel Cunningham, cause I prefer TuxOnIce
over other hibernation methods. Since all of the freezes just happened after a
fresh boot of the system without any snapshot cycle in between them, I believe
this to be a mainline kernel bug.

All freezes have been while running a KDE 4.4.4 desktop with OpenGL compositing
enabled. The first two times just shortly after login in to the desktop. The
third time while playing an AVI file from my photo SD card with Dragon Player.
On the other hand I had hours of uptime with some TuxOnIce snapshot cycles
without anything happening. I never had a freeze after the machine had done
snapshot cycle. The freezes rather happened shortly after a fresh boot of the
machine.

I am not sure whether this is a Radeon DRM KMS related bug, but this is my best
guess at the moment. Other activities involved in all three situations were:

- USB. On the first two a M-Audio Sonica Theater was connected. On the third
the kernel was reading the AVI file from a SD card connected via USB card
reader.

- eSATA harddisk. In all times an external 500 GB harddisk was connected via
eSATA

But also here I had the kernel running for hours with USB or eSATA without
anything happening.

In the further cause I will attach some hardware and software details that
might be helpful.

Currently I just downgraded to 2.6.33 again. I compiled me a 2.6.33.6. Since
actually I really want some stability at least during the week where I hold a
Linux training, I want to stick with it for now. Currently my plans are to wait
for 2.6.34.2 or .3 and try again. The laptop is used for production work and I
want it to meet some basic stability requirements. But if need be and I manage
to take time for it, I may do some guided testing.

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[Bug 16376] random - possibly Radeon DRM KMS related - freezes

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https://bugzilla.kernel.org/show_bug.cgi?id=16376





--- Comment #1 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-13 10:11:15 ---
Created an attachment (id=27083)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=27083)
hardware of my ThinkPad T42, lspci -nvv

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[Bug 16376] random - possibly Radeon DRM KMS related - freezes

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https://bugzilla.kernel.org/show_bug.cgi?id=16376





--- Comment #2 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-13 10:15:02 ---
Userspace I use:

apt-show-versions | egrep
"(xserver-xorg/|xserver-xorg-core/|xserver-xorg-video-radeon/|libgl1-mesa-dri/|libdrm2/|libdrm-radeon1/|kde-window-manager/)"
kde-window-manager/squeeze uptodate 4:4.4.4-1
libdrm-radeon1/experimental uptodate 2.4.21-1
libdrm2/experimental uptodate 2.4.21-1
libgl1-mesa-dri/experimental uptodate 7.8.2-1
xserver-xorg/squeeze uptodate 1:7.5+6
xserver-xorg-core/squeeze uptodate 2:1.7.7-2
xserver-xorg-video-radeon/sid uptodate 1:6.13.1-1

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[Bug 16376] random - possibly Radeon DRM KMS related - freezes

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https://bugzilla.kernel.org/show_bug.cgi?id=16376





--- Comment #3 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-13 10:24:05 ---
I did some research on the internet and found this possibly related case - hot,
since it also happens on a ThinkPad T42 with similar if not same graphics
hardware:

------------------------------------------------------
Random freezes with kernel 2.6.34 and xorg 1.8

The other day I upgraded the kernel to version 2.6.34 and at the same time
xorg-server to 1.8 (along with input drivers and video drivers). From that
moment, I suffer from random freezes, the system is completely locked up; the
screen doesn't blank, though. The system appears to be perfectly fine, but
after some minutes it will freeze.

As far as I can remember, the freezes only occur when using a webbrowser.
Chromium is my default browser, but also Firefox and Konqueror caused the
system to freeze completely when I want to open a webpage. Other network
programs such as irssi can run for hours and they didn't seem to cause any
havoc.

At first I thought this might be caused by some instability in the latest
xf86-video-ati driver, so I downgraded back to xorg-server 1.7. Still the same
symptoms, so I am pretty sure now there's something in the kernel. So I went
back to xorg-server 1.8 and downgraded the kernel to 2.6.33. So far, the system
hasn't let me down, yet. Also, I uninstalled the madwifi packages on my system
so I'm using the ath5 drivers shipped with the kernel. That change doesn't seem
to make a difference.

I am not exactly sure what exactly could cause this, there's no trace in any
log file to be found. My suspicion is that it's network related.

The hardware is a Thinkpad T42 with an ATI Radeon Mobility 9600 (r300) chip and
an Atheros wireless card.

Anyone else with similar experiences with this hardware? I can't think of a way
how to properly debug this. I know I can bisect, but that's time consuming and
perhaps it's quicker to ask around first before I walk down that road. Any
suggestions are welcome on how to track this down
------------------------------------------------------
http://bbs.archlinux.org/viewtopic.php?pid=789948

I do not use any wireless however, the ipw2200 radio is disabled here.


Unlikely cause it seems to be easily reproducable:

------------------------------------------------------
seems to freeze on drm installation [2.6.34, 2× RV280]

See attached screenshot. While I can boot anything up to 2.6.33,
2.6.34 seems to reproducibly hang itself up when it starts DRM. This
machine has two Radeon RV280 cards.
------------------------------------------------------
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=586137

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[Bug 16376] random - possibly Radeon DRM KMS related - freezes

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https://bugzilla.kernel.org/show_bug.cgi?id=16376





--- Comment #4 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-13 12:43:23 ---
While searching for traces of those freezes in syslog I came across backtraces
that may or may not be releated. See bug #16377. There were prior to the third
freeze. I did not find any backtraces shortly before that freeze. Will look for
the earlier two freezes now.

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[Bug 16376] random - possibly Radeon DRM KMS related - freezes

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Alex Deucher <alexdeucher@gmail.com> changed:

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




--- Comment #5 from Alex Deucher <alexdeucher@gmail.com>  2010-07-13 13:32:15 ---
Does s/r work ok without tuxonice?

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[Bug 16376] random - possibly Radeon DRM KMS related - freezes

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--- Comment #6 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-13 15:12:04 ---
The bug does not appear to be suspend/resume related at all. The freezes did
happen after a fresh boot, without any snapshot cycle in between. They never
happened after the first TuxOnIce cycle which I guess is just a coincidence.

So the machine had no snapshot cycles as the freeze occured. The only thing
TuxOnIce does on a fresh boot is finding no TuxOnIce image and exiting, so I
highly doubt the freezes are TuxOnIce related in any way.

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[Bug 16376] random - possibly Radeon DRM KMS related - freezes

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--- Comment #7 from Alex Deucher <alexdeucher@gmail.com>  2010-07-13 15:14:47 ---
Does this happen with 2.6.35?

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Rafael J. Wysocki <rjw@sisk.pl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |maciej.rutecki@gmail.com,
                   |                            |rjw@sisk.pl
     Kernel Version|                            |2.6.34
             Blocks|                            |15310




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[Bug 16376] random - possibly Radeon DRM KMS related - freezes

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--- Comment #8 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-16 18:15:33 ---
Yes, after giving up on an issue of Debians make-kpkg with Kernel 2.6.35 "+"
sign in version number[1], I used make deb-pkg to compile
2.6.35-rc5-04995-g7441ae8 from TuxOnIce head.

About 5 minutes after booting it, shortly after starting KDE 4 OpenGL
composited desktop session, the machine froze hard. This time I tried accessing
it from another machine, my second ThinkPad, a T23 with SuperSavage chipset.
The frozen T42 did not answer to any ping, "destination host unreachable". Thus
I conclude the kernel was completely locked up. Again it was a fresh boot, no
hibernation cycle in between.

The T23 also has a 2.6.34.1 which didn't yet lock up and has an uptime of 7
days, but only 3 TuxOnIce snapshot cycles. It appears to be stable. Thus I
think it really could have to do with radeon KMS DRM code.

[1] http://bugs.debian.org/588178

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--- Comment #9 from Alex Deucher <alexdeucher@gmail.com>  2010-07-16 19:18:13 ---
Any chance you could bisect this?

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--- Comment #10 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-16 21:08:55 ---
Difficult, since it doesn't happen all the time, I have no clear pattern on
reproducabilty. When it happened it often happened within 5 minutes after
starting the desktop, but when playing the AVI videos from SD card it took
longer. And sometimes it just didn't freeze at all.

This also is the laptop for all my stuff, thus I have some stability
requirements for it. I never did bisecting so far, but as far as I understand
it usually includes testing about a dozen kernels and thus having a dozen
freezes - quite some risk to loose unsaved data as I can't predict if and when
it freezes.

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--- Comment #11 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-16 21:14:56 ---
But there is no other way to get this one tracked? I thought about net console,
but when the kernel doesn't even respond to a ping anymore, I guess it won't
send out anything over the net. Maybe in the momemts before the freeze it sends
anything?

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--- Comment #12 from Alex Deucher <alexdeucher@gmail.com>  2010-07-23 14:30:10 ---
Unfortunately GPU freezes are really hard to track down without a reliable test
case.

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--- Comment #13 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-23 15:17:48 ---
I don't have a reliable test case. It does not happen always, but when it
happened, it usually happened quite short after the first boot. Unfortunately
with bisecting that would mean booting a kernel three or five times and letting
it run for about half an hour to be quite sure. An that for possibly a dozen
kernels of which some might have other problems like eating my filesystems.
Right now thats too much for me. I can test some selected kernels or patches as
I manage to take time however.

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--- Comment #14 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-23 15:19:29 ---
Another hint: I ran 2.6.34.1 on a Radeon based Dell workstation at work, but
without KMS and there the desktop never froze. It had a problem with shutting
down one SoftRAID on hibernation so I downgraded there too (also reported). The
2.6.34.1 on my SuperSavage based T23 is behaving well currently.

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Dragos Delcea <dragos.delcea@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dragos.delcea@gmail.com




--- Comment #15 from Dragos Delcea <dragos.delcea@gmail.com>  2010-07-25 18:51:35 ---
I think I might have stumbled over this as well. Hw is a Lenovo T60 Thinkpad
(radeon mobility X1400 video card). I'm on 32 bit gentoo, everything 2.6.33 and
below works; 2.6.34 - in either gentoo or vanilla flavours - has random
freezes.

I'using 2.6.33.6 currently and I am happy, 2.6.34.1 and 2.6.34.2 (and other
gentoo 2.6.34 specific kernels as well) freeze on me. Notably, I'm not using
KMS yet, but I am following the radeon master git; not sure whether the freezes
are graphic related, though. My use case that seems to trigger this is KVM;
having 2 VMs running at once is usually enough.

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--- Comment #16 from Dragos Delcea <dragos.delcea@gmail.com>  2010-07-26 07:08:27 ---
It should have red: 2.6.33.x works while 2.6.34 and 2.6.34.1 freeze on me.
There's no 2.6.34.2 (yet) available.

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--- Comment #17 from Alex Deucher <alexdeucher@gmail.com>  2010-07-26 14:59:05 ---
(In reply to comment #16)
> It should have red: 2.6.33.x works while 2.6.34 and 2.6.34.1 freeze on me.
> There's no 2.6.34.2 (yet) available.

Can you bisect to see what commit is causing the problem?

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--- Comment #18 from Dragos Delcea <dragos.delcea@gmail.com>  2010-07-28 12:05:47 ---
I can't reproduce it anymore with 2.6.35-rc6. I'm going to stay with the same
kernel and switch to KMS and see if I can reproduce the reporter's problem.

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--- Comment #19 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-28 12:51:23 ---
I started a compile of 2.6.35-rc6 and will test as well. Thanks.

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--- Comment #20 from Alex Deucher <alexdeucher@gmail.com>  2010-07-28 14:32:47 ---
If rc6 is stable, can you bisect between rc5 and rc6 to see what fixed the
issue?  It should be a much smaller change set.

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--- Comment #21 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-07-28 17:33:33 ---
2.6.35-rc6 froze a few minutes after the second boot directly after opening an
image in Gwenview from KDE 4.4.4. After the first boot it was stable for 25
minutes including playing some AVI movie from my digicam with Dragon Player -
but well it seems to be randomly, I have no pattern to trigger it - only
observation I made is if it doesn't happen in the first half hour after boot it
likely doesn't happen anymore until I do another fresh boot:

martin@shambhala:~> uprecords -m200 | egrep "(rc6|#)"
     #               Uptime | System                                     Boot
up
   127     0 days, 00:25:14 | Linux 2.6.35-rc6-tp42-to  Wed Jul 28 18:46:25
2010
   186     0 days, 00:00:53 | Linux 2.6.35-rc6-tp42-to  Wed Jul 28 19:12:13
2010

--- Comment #22 from Rafael J. Wysocki <rjw@sisk.pl>  2010-08-01 14:16:56 ---
Handled-By : Alex Deucher <alexdeucher@gmail.com>

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--- Comment #23 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-08-14 16:47:40 ---
This bug still happens with 2.6.35.2. This time it hung while compiling
virtualbox-ose kernel modules and playing music with Amarok. The music stopped
playing.

I think I will have a try with 2.6.36-rc3 or 4 again. And if I manage to do it
possibly at least try going back to some 2.6.34-rc's to see if the bug was
introduced with some rc. I do not feel comfortable with bisecting at random
versions, cause I don't know whether they might have been short lived ext4
filesystem corruption bugs or whatnot.

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Martin Steigerwald <Martin@Lichtvoll.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |airlied@linux.ie




--- Comment #24 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-08-14 16:54:43 ---
Dave, I hope you do not mind adding you to the CC list, but since this happens
on a ThinkPad T42 your feedback might help.

I thought:

From: Michel Dänzer <daenzer@vmware.com>

commit e376573f7267390f4e1bdc552564b6fb913bce76 upstream.

This fixes a problem where on low VRAM cards we'd run out of space for
validation.

[airlied: Tested on my M7, Thinkpad T42, compiz works with no problems.]

Signed-off-by: Michel Dänzer <daenzer@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

might have fixed this bug

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--- Comment #25 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-08-14 17:03:47 ---
Dave, I hope you do not mind adding you to the CC list, but since this happens
on a ThinkPad T42 your feedback might help.

I thought

----------------------------------------
From: Michel Dänzer <daenzer@vmware.com>

commit e376573f7267390f4e1bdc552564b6fb913bce76 upstream.

This fixes a problem where on low VRAM cards we'd run out of space for
validation.

[airlied: Tested on my M7, Thinkpad T42, compiz works with no problems.]

Signed-off-by: Michel Dänzer <daenzer@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
----------------------------------------

might have fixed this bug since I read something about this having been tested
on a T42. I did not recognize that it was your comment, so I contacted Michel
Dänzer about it.

He said its unlikely that it will fix my issue, but I should try it anyway.
Well as said above, I tried 2.6.35.2 and it still hung.

You say compiz works without problems for you. I read this as you do not get
any hard freezes with any kernel since 2.6.34 on your ThinkPad T42. Did you try
KDE 4 KWin compositing as well? What X.org / driver versions do you use. There
must be a difference why it works for your ThinkPad, but not for mine.

Here are my current versions:

martin@shambhala:~> apt-show-versions | egrep
"(xserver-xorg/|xserver-xorg-core/|xserver-xorg-video-radeon/|libgl1-mesa-dri/|libdrm2/|libdrm-radeon1/|kde-window-manager/|kdelibs5/)"
kde-window-manager/squeeze uptodate 4:4.4.5-1
kdelibs5/squeeze uptodate 4:4.4.5-1
libdrm-radeon1/experimental uptodate 2.4.21-1
libdrm2/experimental uptodate 2.4.21-1
libgl1-mesa-dri/experimental uptodate 7.8.2-2
xserver-xorg/squeeze uptodate 1:7.5+6
xserver-xorg-core/squeeze uptodate 2:1.7.7-3
xserver-xorg-video-radeon/squeeze uptodate 1:6.13.1-2

As noted above in the bug report: Kernel 2.6.33 works rock stable for me with
Radeon KMS. But that said, I am not even sure whether its a Radeon KMS issue.
That it only happens after a KDE 4 compositing session has started points at
it, but is no proof anyway.

I want to help to provide information to get this fixes, but I feel uneasy
about doing a full bisect between 2.6.33 and 2.6.34. I might start trying out
whether it starts happening at some rc, starting with rc3 and going forwards or
backwards from there.

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--- Comment #26 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-08-23 12:39:21 ---
Still happens with 2.6.35.3. This time I setup a netconsole connection.
Nothing. So its really a complete hard freeze. Next step probably is trying
2.6.34-rc2 and going back or forward until I at least now between which rc the
regression has been introduced. Or trying 2.6.36-rc2.

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--- Comment #27 from Alex Deucher <alexdeucher@gmail.com>  2010-08-23 14:20:40 ---
Does disabling the lockup detect code fix the issue?

--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -1345,6 +1345,8 @@ bool r600_gpu_is_lockup(struct radeon_device *rdev)
        u32 grbm_status2;
        int r;

+       return false;
+
        srbm_status = RREG32(R_000E50_SRBM_STATUS);
        grbm_status = RREG32(R_008010_GRBM_STATUS);
        grbm_status2 = RREG32(R_008014_GRBM_STATUS2);

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--- Comment #28 from Alex Deucher <alexdeucher@gmail.com>  2010-08-23 14:22:32 ---
updated patch:
diff --git a/drivers/gpu/drm/radeon/r100.c b/drivers/gpu/drm/radeon/r100.c
index c0c5cef..7d9cc47 100644
--- a/drivers/gpu/drm/radeon/r100.c
+++ b/drivers/gpu/drm/radeon/r100.c
@@ -1996,6 +1996,8 @@ bool r100_gpu_is_lockup(struct radeon_device *rdev)
        u32 rbbm_status;
        int r;

+       return false;
+
        rbbm_status = RREG32(R_000E40_RBBM_STATUS);
        if (!G_000E40_GUI_ACTIVE(rbbm_status)) {
                r100_gpu_lockup_update(&rdev->config.r100.lockup, &rdev->cp);
diff --git a/drivers/gpu/drm/radeon/r300.c b/drivers/gpu/drm/radeon/r300.c
index 3ba05d0..176f791 100644
--- a/drivers/gpu/drm/radeon/r300.c
+++ b/drivers/gpu/drm/radeon/r300.c
@@ -384,6 +384,8 @@ bool r300_gpu_is_lockup(struct radeon_device *rdev)
        u32 rbbm_status;
        int r;

+       return false;
+
        rbbm_status = RREG32(R_000E40_RBBM_STATUS);
        if (!G_000E40_GUI_ACTIVE(rbbm_status)) {
                r100_gpu_lockup_update(&rdev->config.r300.lockup, &rdev->cp);
diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 667c237..bba86d5 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -1345,6 +1345,8 @@ bool r600_gpu_is_lockup(struct radeon_device *rdev)
        u32 grbm_status2;
        int r;

+       return false;
+
        srbm_status = RREG32(R_000E50_SRBM_STATUS);
        grbm_status = RREG32(R_008010_GRBM_STATUS);
        grbm_status2 = RREG32(R_008014_GRBM_STATUS2);

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--- Comment #29 from Alex Deucher <alexdeucher@gmail.com>  2010-08-23 14:31:04 ---
Please also try this patch:
http://git.kernel.org/?p=linux/kernel/git/airlied/drm-2.6.git;a=commitdiff;h=4e186b2d6c878793587c35d7f06c94565d76e9b8

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--- Comment #30 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-08-23 14:37:27 ---
Should I try both patches together? Or each one seperately? I am currently also
compiling a 2.6.36-rc2.

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--- Comment #31 from Alex Deucher <alexdeucher@gmail.com>  2010-08-23 14:39:11 ---
Separately please.

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--- Comment #32 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-08-23 19:44:44 ---
2.6.35.3-tp42-toi-3.1.1.1-no-lockup-detect-05004-ga695ed8-dirty, the kernel
with your patch to disable lockup detection did look very promising. Just as I
wanted to tell you that it works it locked up again. It survived three boots
with 20-30 minutes of KDE 4 OpenGL compositing setting. But after the last boot
it locked up after one and a half hour.

Could it be that this now was a lockup due to *missing* lockup detection. I
will try the other patch tomorrow. Now I wan't to use my laptop. ;)

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--- Comment #33 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-08-24 18:30:33 ---
drm-bail-early-if-nothing-changes-2.6.git-4e186b2d6c878793587c35d7f06c94565d76e9b8.patch
didn't work either. The machine crashed a few minutes after second boot in the
middle of a window movement. I think I will try 2.6.36-rc2 next and if that
doesn't work, start with 2.6.34-rc2 and go forward or backward from there,
depending on the results. Or look whether I can git bisect with an emphasis of
trying likely safe versions like rc's before going in the middle of critical
changes.

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--- Comment #34 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-08-25 10:44:52 ---
No luck with 2.6.36-rc2-tp42-00203-g502adf5 from Linus' git either. It hung
after the second boot. That also proves that TuxOnIce is not involved in the
bug. Back to 2.6.33.7 for now. This one works absolutely stable.

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--- Comment #35 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-08-26 19:18:39 ---
So I am indeed bisecting this, but it is slow - cause last time just after 5
reboots and hours of testing the kernel froze after I marked it as good and
started compiling the next one and since I did not find a git bisect undo to do
git bisect bad after it, I used git bisect reset and git bisect start from that
commit as bad to v2.6.33 as good - and how I am stuck:

martin@shambhala:~/Computer/Shambhala/Kernel/2.6.33-2.6.34-bisect/linux-2.6>
git bisect log
# bad: [64ba9926759792cf7b95f823402e2781edd1b5d4] Merge branch 'for-linus' of
git://git.open-osd.org/linux-open-osd
# good: [60b341b778cc2929df16c0a504c91621b3c6a4ad] Linux 2.6.33
git bisect start '64ba9926759792cf7b95f823402e2781edd1b5d4' 'v2.6.33'
# skip: [d3ae8562d43fe2b97d605dd67dc67bf8fa9b956a] usb: host: ehci: fix missing
kfree in remove path also
git bisect skip d3ae8562d43fe2b97d605dd67dc67bf8fa9b956a
# good: [8bd93a2c5d4cab2ae17d06350daa7dbf546a4634] rcu: Accelerate grace period
if last non-dynticked CPU
git bisect good 8bd93a2c5d4cab2ae17d06350daa7dbf546a4634
# skip: [5be796f0b842c5852d7397a82f8ebd6be8451872] USB: ch341: use
get_unaligned_le16 in break_ctl
git bisect skip 5be796f0b842c5852d7397a82f8ebd6be8451872

I ran into a non booting kernel with d3ae8562d43fe2b97d605dd67dc67bf8fa9b956a,
it oopsed with a backtrace in ext4 and readahead I don't want to think about
deeply, so I skipped it. Then it put me just a few revisions after 2.6.33, a
kernel that didn't make much sense for me to test - I did nonetheless, it was
good as expected. Then it took me just a few revision after the non working
kernel. Consequently this one didn't boot as well and I skipped it. After that
git bisect took me prior to 2.6.33, git log from
5be796f0b842c5852d7397a82f8ebd6be8451872 gives me

    296 commit 6b7b284958d47b77d06745b36bc7f36dab769d9b
    297 Author: Linus Torvalds <torvalds@linux-foundation.org>
    298 Date:   Thu Dec 24 13:09:41 2009 -0800
    299 
    300     Linux 2.6.33-rc2

on line 300. But I told git that v2.6.33 was good. It can't be serious about
asking me to test a kernel *prior* to 2.6.33!

Testing is really slow as as it seems even after the fifth reboot and some
hours of uptime it can still freeze. So I need about half a day to be quite
sure that a kernel is good. I won't waste my time going prior to 2.6.33 which
is known good to make this experience even more painful that it was already.

So I ask for advice on how to proceed.

Well at least its clear now, that the freeze was introduced way prior to
2.6.34-rc1. I would have liked it the other way around.

According to git its still

martin@shambhala:~/Computer/Shambhala/Kernel/2.6.33-2.6.34-bisect/linux-2.6>
git bisect skip
Bisecting: 2518 revisions left to test after this (roughly 11 steps)

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--- Comment #36 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-08-26 19:28:43 ---
Should I just mark the current soon after 2.6.33-rc2 kernel
5be796f0b842c5852d7397a82f8ebd6be8451872 I am not interested as good without
even compiling it, so that git hopefully takes me to another one around the one
that I skipped cause it didn't boot?

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--- Comment #37 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-09-05 07:26:50 ---
Created an attachment (id=29002)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=29002)
bisect cont'd - unbootable kernels ext4 / readahead backtrace

I asked on kernel-ml and got a hint that this may be due to merges. Thus I
tested this kernel and continued. git bisect pointed me back to a lot of
unbootable kernels with the ext4/readahead backtrace. They have all been in a
USB merge. I am not booting from USB. I think that bug has been introduced
before that USB merge and been fixed somewhen after merging it, so after
testing about five unbootable kernels from that range, I told git bisect to
skip all the commits of that merge. After testing a few kernels including one
that showed "Destination address too large" and "-- System halted" just after
trying to boot it, I got one thats quite some revisions prior to the USB merge.
I'll test it and hope that it boots.

I will post a complete bisect log of what I have so far in a moment.

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--- Comment #38 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-09-05 07:35:55 ---
Created an attachment (id=29012)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=29012)
current state of bisection, please help with selecting next commits to test

If its indeed a Radeon KMS related freeze and upto now everything points at
this, I think it has been introduced in the first quarter of commits that git
bisect visualize shows. I'd like to test just before these KMS/DRM related
commits and just after it to speed up the bisection process, but there are
branches and merges and also there are those unbootable kernels (see previous
commit) not that much before these KMS/DRM related commits, so I am unsure an
which exact commit ids too choose.

Please help me selecting suitable commits - I had more than five unbootable
kernels already and the range of commits to test thus is still above 1800. I
really like to shorten this. In the meanwhile I am just going to compile and
test the next kernel.

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--- Comment #39 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-09-05 13:29:03 ---
Well I now go with

martin@shambhala:~/Computer/Shambhala/Kernel/2.6.33-2.6.34-
bisect/linux-2.6> git log | head      
commit a27341cd5fcb7cf2d2d4726e9f324009f7162c00
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date:   Tue Mar 2 08:36:46 2010 -0800

    Prioritize synchronous signals over 'normal' signals

    This makes sure that we pick the synchronous signals caused by a
    processor fault over any pending regular asynchronous signals sent to
    use by [t]kill().

When I interpret the graphical display of gitk correctly this one should 
be directly before the whole lot of KMS/DRM/Radeon/Intel commits being 
merged.

Now hopefully this one boots. And is good. Then I would have skipped a 
whole lot of the revisions to test. But even when it just boots, but is 
bad, I at least know that its not in these merges.

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[Bug 16376] random - possibly Radeon DRM KMS related - freezes

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=16376





--- Comment #40 from Alex Deucher <alexdeucher@gmail.com>  2010-09-07 18:33:27 ---
This might be a duplicate of:
https://bugs.freedesktop.org/show_bug.cgi?id=28402
Does the patch there help?

--- Comment #41 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-09-08 16:36:29 ---
Created an attachment (id=29352)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=29352)
Current status of git bisection, now testing patches mentioned in comment

Alex from looking at the backtrace Alex hinted me that this might be a
duplicate of[1]:

Bug 28402 - Kernel 2.6.34 freezes randomly
https://bugs.freedesktop.org/show_bug.cgi?id=28402

I will now try patch from comment 47 of that bug and then those mentioned by Da
Fox im comment 43.

[1] See thread "Bisecting radeon kms freeze bug: Almost there, please help with
choosing next commit": http://lkml.org/lkml/2010/9/7/199

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[Bug 16376] random - possibly Radeon DRM KMS related - freezes

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https://bugzilla.kernel.org/show_bug.cgi?id=16376





--- Comment #42 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-09-08 16:40:58 ---
comment 44 instead of 43 that should have been.

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[Bug 16376] random - possibly Radeon DRM KMS related - freezes

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https://bugzilla.kernel.org/show_bug.cgi?id=16376





--- Comment #43 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-09-08 21:48:55 ---
Created an attachment (id=29382)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=29382)
no freezes so far with vmembase zero patch from Dave

The vmem align patch from Alex (comment #41 of freedesktop bug) didn´t help. I
now test the vmembase at zero patch from Dave (attached here and comment #41 of
the fdo bug). 

Looks very good so far. I will reboot this kernel several times tomorrow - as a
freeze so far only every happened *before* the first hibernation / snapshot
cycle - but I looked some Startrek Voyager without a freeze with:

martin@shambhala:~/Computer/Shambhala/Kernel/2.6.36> cat /proc/version 
Linux version 2.6.36-rc3-tp42-toi-3.2-rc1-vmembase-0-05032-g60140c1-dirty
(martin@shambhala) (gcc version 4.4.5 20100728 (prerelease) (Debian 4.4.4-8) )
#2 PREEMPT Wed Sep 8 21:36:34 CEST 2010

Thanks.

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[Bug 16376] random Radeon DRM KMS related freezes

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=16376


Martin Steigerwald <Martin@Lichtvoll.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|random - possibly Radeon    |random Radeon DRM KMS
                   |DRM KMS related - freezes   |related freezes




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[Bug 16376] random Radeon DRM KMS related freezes

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=16376


Martin Steigerwald <Martin@Lichtvoll.de> changed:

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




--- Comment #44 from Martin Steigerwald <Martin@Lichtvoll.de>  2010-12-07 21:18:40 ---
Fix is upstream:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=b7d8cce5b558e0c0aa6898c9865356481598b46d

Tested in 2.6.37-rc3. 2.6.37-rc5 seems stable too.

Many thanks.

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[Bug #16376] random - possibly Radeon DRM KMS related - freezes

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.33 and 2.6.34.

The following bug entry is on the current list of known regressions
introduced between 2.6.33 and 2.6.34.  Please verify if it still should
be listed and let the tracking team know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=16376
Subject		: random - possibly Radeon DRM KMS related - freezes
Submitter	: Martin Steigerwald <Martin@Lichtvoll.de>
Date		: 2010-07-13 09:24 (20 days old)
Handled-By	: Alex Deucher <alexdeucher@gmail.com>

[Bug #16376] random - possibly Radeon DRM KMS related - freezes

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.33 and 2.6.34.

The following bug entry is on the current list of known regressions
introduced between 2.6.33 and 2.6.34.  Please verify if it still should
be listed and let the tracking team know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=16376
Subject		: random - possibly Radeon DRM KMS related - freezes
Submitter	: Martin Steigerwald <Martin-SpPJhY7q8xqazgQtNeiOUg@public.gmane.org>
Date		: 2010-07-13 09:24 (20 days old)
Handled-By	: Alex Deucher <alexdeucher-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>

[Bug #16376] random - possibly Radeon DRM KMS related - freezes

[Rafael J. Wysocki]

This message has been generated automatically as a part of a report
of regressions introduced between 2.6.33 and 2.6.34.

The following bug entry is on the current list of known regressions
introduced between 2.6.33 and 2.6.34.  Please verify if it still should
be listed and let the tracking team know (either way).


Bug-Entry	: http://bugzilla.kernel.org/show_bug.cgi?id=16376
Subject		: random - possibly Radeon DRM KMS related - freezes
Submitter	: Martin Steigerwald <Martin@Lichtvoll.de>
Date		: 2010-07-13 09:24 (11 days old)