[Bug 40541] New: unable to handle kernel NULL pointer dereference at (null)

[Bug 40541] New: unable to handle kernel NULL pointer dereference at (null)

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=40541

           Summary: unable to handle kernel NULL pointer dereference at
                           (null)
           Product: xorg
           Version: 7.4
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
        ReportedBy: bugs.freedesktop.org-0dECgsrgJpy+5WzXG67F4EEOCMrvLtNR@public.gmane.org
         QAContact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org


Created an attachment (id=50801)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=50801)
Important parts of my logs.

I am getting the attached Errors since I am using kwin 4.7.0 with OpenGL-ES.

I am not sure if the following is related: When I am changing window sizes
several times my memory gets filled up. The memory is not released by
restarting kwin or X. When I filled my memory by doing this, I do not have to
wait long for the attached Error, but I do not know what triggers it exactly.

Occasionally, I also have thousands of messages of the following form in my
logs:

Aug 08 18:06:09 [kernel] [ 3810.714471] [TTM] Failed to find memory space for
buffer 0xffff8800bc392000 eviction.
Aug 08 18:06:09 [kernel] [ 3810.714476] [TTM] No space for ffff8800bc392000 (96
pages, 384K, 0M)
Aug 08 18:06:09 [kernel] [ 3810.714479] [TTM]   placement[0]=0x00070002 (1)
Aug 08 18:06:09 [kernel] [ 3810.714480] [TTM]     has_type: 1
Aug 08 18:06:09 [kernel] [ 3810.714482] [TTM]     use_type: 1
Aug 08 18:06:09 [kernel] [ 3810.714484] [TTM]     flags: 0x0000000A
Aug 08 18:06:09 [kernel] [ 3810.714485] [TTM]     gpu_offset: 0x00000000
Aug 08 18:06:09 [kernel] [ 3810.714487] [TTM]     size: 131072
Aug 08 18:06:09 [kernel] [ 3810.714489] [TTM]     available_caching: 0x00070000
Aug 08 18:06:09 [kernel] [ 3810.714491] [TTM]     default_caching: 0x00010000

This is the reason, why I did not upload full logs (all in all 40MB).
Nevertheless, I can upload more logs if you wish so.

As you can see in the logs, I have this problem since several kernel versions.

My graphics card: GeForce 8600 GT

Some version information (only applicable for the last logged crash):

sys-kernel/gentoo-sources-3.0.1
x11-base/xorg-x11-7.4-r1
x11-drivers/xf86-video-nouveau-0.0.16_pre20110801
x11-libs/libdrm-2.4.26
media-libs/mesa-7.11

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[Bug 40541] unable to handle kernel NULL pointer dereference at (null)

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=40541

--- Comment #1 from Marcin Slusarz <marcin.slusarz-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2011-09-01 08:45:16 PDT ---
NULL pointer dereference in nv50_vm_map_sg was fixed in 3.1-rc4 (commits
8d3bb23609d4ae22803a15d232289fc09a7b61c4 and
eac2095398668f989a3dd8d00be1b87850d78c01)

I'm not sure about the other errors. It looks like there is a VRAM leak
somewhere. Can you test Nouveau Linux tree (*), with kmemleak enabled (if
possible)?

(*) http://nouveau.freedesktop.org/wiki/InstallDRM

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[Bug 40541] unable to handle kernel NULL pointer dereference at (null)

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

https://bugs.freedesktop.org/show_bug.cgi?id=40541

bugs.freedesktop.org-0dECgsrgJpy+5WzXG67F4EEOCMrvLtNR@public.gmane.org changed:

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

--- Comment #2 from bugs.freedesktop.org-0dECgsrgJpy+5WzXG67F4EEOCMrvLtNR@public.gmane.org 2012-01-31 11:56:16 PST ---
Yes, a kernel update fixed the NULL pointer dereference for me.

I do not experience the memory problem any more since I use kwin 4.8.0.

I still can not explain why killing kwin/X did not release the occupied memory,
but since I do not experience problems any more and I can not give more detail,
I mark this bug as resolved.

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