[Bug 98417] TTM broken on 4.9-rc2

[Bug 98417] TTM broken on 4.9-rc2

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98417

            Bug ID: 98417
           Summary: TTM broken on 4.9-rc2
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: krejzi@email.com

Created attachment 127520
  --> https://bugs.freedesktop.org/attachment.cgi?id=127520&action=edit
dmesg

As the title says.

Relevant dmesg output:

[   12.409144] ttm: no symbol version for memcpy
[   12.409146] ttm: Unknown symbol memcpy (err -22)
[   12.409167] ttm: no symbol version for clear_page
[   12.409167] ttm: Unknown symbol clear_page (err -22)
[   12.409178] ttm: no symbol version for copy_page
[   12.409179] ttm: Unknown symbol copy_page (err -22)
[   12.409204] ttm: no symbol version for phys_base
[   12.409205] ttm: Unknown symbol phys_base (err -22)
[   12.409216] ttm: no symbol version for memset
[   12.409216] ttm: Unknown symbol memset (err -22)
[   12.409219] ttm: no symbol version for ___preempt_schedule
[   12.409219] ttm: Unknown symbol ___preempt_schedule (err -22)

Full dmesg output and kernel config are attached.

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[Bug 98417] TTM broken on 4.9-rc2

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=98417

--- Comment #1 from Armin K <krejzi@email.com> ---
Created attachment 127521
  --> https://bugs.freedesktop.org/attachment.cgi?id=127521&action=edit
config

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[Bug 98417] TTM broken on 4.9-rc2

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https://bugs.freedesktop.org/show_bug.cgi?id=98417

--- Comment #2 from Michel Dänzer <michel@daenzer.net> ---
This looks like a build system / configuration / setup issue, not an amdgpu (or
even ttm) bug.

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[Bug 98417] TTM broken on 4.9-rc2

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https://bugs.freedesktop.org/show_bug.cgi?id=98417

Christian König <deathsimple@vodafone.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #3 from Christian König <deathsimple@vodafone.de> ---
Yeah, from the missing symbols I would guess that TTM was compiled with a
different config than the rest of the kernel.

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[Bug 98417] TTM broken on 4.9-rc2

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https://bugs.freedesktop.org/show_bug.cgi?id=98417

--- Comment #4 from Armin K <krejzi@email.com> ---
Well, the same config worked in pre 4.9-rc1 drm-next. The module and kernel
were compiled together. However, this config is, and always has been, building
amdgpu/ttm as a module, and the rest of the drivers (very minimal set, tied to
this machine only) as built-in.

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[Bug 98417] TTM broken on 4.9-rc2

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https://bugs.freedesktop.org/show_bug.cgi?id=98417

--- Comment #5 from Alex Deucher <alexdeucher@gmail.com> ---
Can you bisect?  I can't reproduce this and there haven't been any changes to
ttm that would cause anything like this that I can see.

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[Bug 98417] TTM broken on 4.9-rc2

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https://bugs.freedesktop.org/show_bug.cgi?id=98417

--- Comment #6 from Armin K <krejzi@email.com> ---
Might be changes to KConfig and deps handling.

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[Bug 98417] TTM broken on 4.9-rc2

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https://bugs.freedesktop.org/show_bug.cgi?id=98417

--- Comment #7 from Adam J. Richter <adam_richter2004@yahoo.com> ---
Agreeing with the previous comments that this is probably not a TTM problem, I
want to pass along that I have observed what is probably the same problem, but
with many kernel modules unrelated to TTM and graphics.

I think it might be possible to work around the problem by disabling
CONFIG_MODVERSIONS, but just have not had the time to try that yet.

I suspect that this has something to do with the changes in symbol exports that
occurred in linux 4.9-rc1, which you can see if you do something like:

diff -pruN linux-{4.8,4.9-rc1}/arch/x86/lib

The symbols that I have had trouble with, such as memset, are ones that have
had export declarations added to assembler sources (.S files).  I see that the
entry for memset in the generated file Module.symvers is different.

In Linux 4.8, it looks like this:
0xfb578fc5      memset  vmlinux EXPORT_SYMBOL

In Linux 4.9-rc1, it looks like this:
0x00000000      memset  vmlinux EXPORT_SYMBOL

As you can see, the first field, which I believe is some sort of checksum of
the C function declaration, is all zeroes for memset in Linux 4.9-rc1.

I am still looking into this, but I am posting now because I may need to set
this task aside for a day or two and didn't want to delay in passing along
information that I think might be helpful in resolving your problem.

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[Bug 98417] TTM broken on 4.9-rc2

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https://bugs.freedesktop.org/show_bug.cgi?id=98417

--- Comment #8 from Adam J. Richter <adam_richter2004@yahoo.com> ---
FYI, here is a very readable document that explains how kernel symbol
versioning is implemented:
http://tldp.org/HOWTO/Module-HOWTO/basekerncompat.html .

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[Bug 98417] TTM broken on 4.9-rc2

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https://bugs.freedesktop.org/show_bug.cgi?id=98417

Martin Peres <martin.peres@free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |MOVED
             Status|NEEDINFO                    |RESOLVED

--- Comment #9 from Martin Peres <martin.peres@free.fr> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/drm/amd/issues/112.

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