[Bug 23712] New: NVA0 KMS: kernel NULL pointer dereference

[Bug 23712] New: NVA0 KMS: kernel NULL pointer dereference

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23712

           Summary: NVA0 KMS: kernel NULL pointer dereference
           Product: xorg
           Version: unspecified
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
        ReportedBy: peter.henriksson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
         QAContact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org


Created an attachment (id=29219)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29219)
kernel log

I have been getting this NULL pointer dereference since drm-next was merged to
nouvuea/linux-2.6 master on August 21.

The card is a GeForce GTX 275 (NVA0)

The dereference does not happen in the following circumstances.
1. kernel has CONFIG_DEBUG_INFO=y
2. booting with kms disabled and then reloading the module with modeset=1

What other information should I provide to help figure this out?
bisecting is difficult due to the drm-next merge.

The attached trace is with current master (e02aed2)


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[Bug 23712] NVA0 KMS: kernel NULL pointer dereference

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23712


Pekka Paalanen <pq-X3B1VOXEql0@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #29219|application/octet-stream    |text/plain
          mime type|                            |




--- Comment #1 from Pekka Paalanen <pq-X3B1VOXEql0@public.gmane.org>  2009-09-04 11:58:13 PST ---
(From update of attachment 29219)
It's not a binary blob, it's text.


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[Bug 23712] NVA0 KMS: kernel NULL pointer dereference

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23712





--- Comment #2 from Peter Henriksson <peter.henriksson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-17 11:35:22 PST ---
Created an attachment (id=29647)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29647)
kernel log with highmem disabled


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[Bug 23712] NVA0 KMS: kernel NULL pointer dereference

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23712





--- Comment #3 from Peter Henriksson <peter.henriksson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-17 11:36:45 PST ---
Created an attachment (id=29648)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=29648)
kernel config


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[Bug 23712] NVA0 KMS: kernel NULL pointer dereference

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23712





--- Comment #4 from Peter Henriksson <peter.henriksson-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>  2009-09-23 00:06:11 PST ---
It might be a good idea to write things down here and not just mention it on
irc.

I have tested for this bug with a few different cards I have access to with the
following results.

NVA0 (GTX 275) Crash
NV92 (8800 GTS) Crash
NV92 (9800 GT) Crash
NV4B (7600 GT) Works

So it seems only NV50 is affected. And there is some suspicion that this is
only in combination with a 32bit kernel.

Also, bugs #23847 and #29593 is probably the same as this one. 


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[Bug 23712] NVA0 KMS: kernel NULL pointer dereference

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

http://bugs.freedesktop.org/show_bug.cgi?id=23712


Peter Henriksson <peter.henriksson@gmail.com> changed:

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




--- Comment #5 from Peter Henriksson <peter.henriksson@gmail.com>  2009-10-01 00:29:01 PST ---
Fixed as of 7798546495c04a810db86be34ba1f39e370fd325

From: Marcin Kościelnicki <koriakin@0x04.net>
Date: Tue, 29 Sep 2009 21:50:16 +0000
Subject: drm/nouveau: fix missized allocation for ttm_bo_global struct


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