[Bug 104730] VLC crashes on playback with "READ_ONLY without WC is disallowed"

[Bug 104730] VLC crashes on playback with "READ_ONLY without WC is disallowed"

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=104730

            Bug ID: 104730
           Summary: VLC crashes on playback with "READ_ONLY without WC is
                    disallowed"
           Product: Mesa
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Gallium/radeonsi
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: EoD@xmw.de
        QA Contact: dri-devel@lists.freedesktop.org
                CC: maraeo@gmail.com

Created attachment 136896
  --> https://bugs.freedesktop.org/attachment.cgi?id=136896&action=edit
VLC gdb bt

In current git master, vlc crashes on any playback with the above assertion.
This is not happening on the same system with Mesa 17.3.3.

I assume the new assertion comes from the following patch:
https://patchwork.freedesktop.org/patch/191502/
https://cgit.freedesktop.org/mesa/mesa/commit/?id=c7f84f6513f9cc9502b9cf3bdca9b95a6b87c98b

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[Bug 104730] VLC crashes on playback with "READ_ONLY without WC is disallowed"

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https://bugs.freedesktop.org/show_bug.cgi?id=104730

--- Comment #1 from Christoph Haag <haagch@frickel.club> ---
This happens with vaapi and omx with assertions enabled.

My patch
https://lists.freedesktop.org/archives/mesa-dev/2018-January/182646.html works
around that by setting the RADEON_FLAG_GTT_WC for UVD buffers in the first
place. Without the patch and with assertions disabled, this flag ends up being
set anyways.

This might not be the right thing to do though, perhaps some other code around
that needs to be fixed.

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[Bug 104730] VLC crashes on playback with "READ_ONLY without WC is disallowed"

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=104730

--- Comment #2 from Christoph Haag <haagch@frickel.club> ---
https://cgit.freedesktop.org/mesa/mesa/commit/?id=17423c993d0b083c7a77a404b85788687f5efe36
should fix it.

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[Bug 104730] VLC crashes on playback with "READ_ONLY without WC is disallowed"

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https://bugs.freedesktop.org/show_bug.cgi?id=104730

Marek Olšák <maraeo@gmail.com> changed:

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

--- Comment #3 from Marek Olšák <maraeo@gmail.com> ---
Fixed by that commit.

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[Bug 104730] VLC crashes on playback with "READ_ONLY without WC is disallowed"

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https://bugs.freedesktop.org/show_bug.cgi?id=104730

--- Comment #4 from EoD <EoD@xmw.de> ---
(In reply to Marek Olšák from comment #3)
> Fixed by that commit.

Yes, VLC plays fine again. Thanks.

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[Bug 104730] VLC crashes on playback with "READ_ONLY without WC is disallowed"

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https://bugs.freedesktop.org/show_bug.cgi?id=104730

--- Comment #5 from EoD <EoD@xmw.de> ---
This does not seem to have made it into mesa 18.0.0-rc3.

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