Bug 104730

Summary:	VLC crashes on playback with "READ_ONLY without WC is disallowed"
Product:	Mesa	Reporter:	EoD <EoD>
Component:	Drivers/Gallium/radeonsi	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED FIXED	QA Contact:	Default DRI bug account <dri-devel>
Severity:	normal
Priority:	medium	CC:	maraeo
Version:	git
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	VLC gdb bt

Description EoD 2018-01-22 14:19:24 UTC

Created attachment 136896 [details]
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

Comment 1 Christoph Haag 2018-01-22 17:18:07 UTC

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.

Comment 2 Christoph Haag 2018-01-27 00:08:45 UTC

https://cgit.freedesktop.org/mesa/mesa/commit/?id=17423c993d0b083c7a77a404b85788687f5efe36 should fix it.

Comment 3 Marek Olšák 2018-01-27 01:22:37 UTC

Fixed by that commit.

Comment 4 EoD 2018-01-27 01:29:12 UTC

(In reply to Marek Olšák from comment #3)
> Fixed by that commit.

Yes, VLC plays fine again. Thanks.

Comment 5 EoD 2018-01-29 13:13:13 UTC

This does not seem to have made it into mesa 18.0.0-rc3.

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