[Bug 38675] New: Recompiled kernel crash on KMS loading

[Bug 38675] New: Recompiled kernel crash on KMS loading

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=38675

           Summary: Recompiled kernel crash on KMS loading
           Product: DRI
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: muziofg@email.it


Created an attachment (id=48405)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=48405)
archive containing .config and dmesg output of my custom kernel

With my custom kernel (config and dmesg attached at this message in a tar.gz
archive) I have a problem with radeon DRM module. 

When the KMS is loading the system is freezed, the keyboard is dead, the
machine doesn't answer at the ping and I can only reset the machine.
I haven't any debug information because this crash show a black screen 
and no file (dmesg, kern.log, messages, ecc) are written.

This problem doesn't happen always, but often so it is also difficult to
determine when a change in the configuration in the kernel may have solved the
problem

I actually use a linux kernel version 2.6.39 on a debian testing. I compile a
personalized kernel from the sources packaged by debian.

The problem seems don't happen with the prebuild kernel (I have tried the
package  linux-image-2.6.39-2-686-pae) but I'm not sure, simply for now, with
this, the machine was started without problem

I never had problems with kernel 2.6.38 using a very similar .config file

The radeon card is a HD6670 PCI Express (chip TURKS)

See here http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=631567 for other
details

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[Bug 38675] Recompiled kernel crash on KMS loading

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=38675

--- Comment #1 from Alex Deucher <agd5f@yahoo.com> 2011-06-25 12:30:52 PDT ---
This might be a duplicate of bug 38583.  Relevant patches:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a377e187df725fe7e62d2cec59ec290c5a605d93
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=ee4017f4ac8163737793cc64df535cd246792887

If they don't help, can you bisect?

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[Bug 38675] Recompiled kernel crash on KMS loading

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=38675

--- Comment #2 from muziofg@email.it 2011-06-25 16:05:20 PDT ---
I tried to apply the patch and it did not work, the system freezes with a
kernel panic. It seems correct because if a precompiled kernel (hence not
patched) works and my custom kernel works (sometimes) could not be this the
problem.

What do you mean with "bisect" ?

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[Bug 38675] Recompiled kernel crash on KMS loading

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=38675

muziofg@email.it changed:

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

--- Comment #3 from muziofg@email.it 2011-06-27 05:23:46 PDT ---
Problem solved

My config have many years, each time "make menuconfig" add the new options but
in the original configuration I have exagerated with the hardening :) 

I have analysed, compared and merged the config of a custom kernel on my old
laptop (wich is full amd) and this .config. Now the kernel boot and KMS is
loaded without problem

I have attached a new archive with old and new confing files
(configOldAndNewForDiff.tar.gz). The answer is in the diff

If you consider interesting the detailed analisys of the problem I can try to
test more combination between this two configuration to find what is requested
by KMS for work without problem

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[Bug 38675] Recompiled kernel crash on KMS loading

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=38675

--- Comment #4 from muziofg@email.it 2011-06-27 05:24:28 PDT ---
Created an attachment (id=48463)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=48463)
old and new config file of my custom kernel

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[Bug 38675] Recompiled kernel crash on KMS loading

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=38675

--- Comment #5 from Ben Hutchings <ben@decadent.org.uk> 2011-07-15 14:32:10 PDT ---
Although the 'crash' configuration is not very sensible, any valid
configuration should not result in a crash so long as the hardware requirements
are met. Comparing the 'ok' and 'crash' configurations, I think the important
difference is probably:

-CONFIG_VIDEO_OUTPUT_CONTROL=y
+# CONFIG_VIDEO_OUTPUT_CONTROL is not set

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