Bug 111589 - Mismatch in modifiers between winsys handle and dmabuf fd
Summary: Mismatch in modifiers between winsys handle and dmabuf fd
Status: NEW
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/Gallium/Iris (show other bugs)
Version: git
Hardware: x86-64 (AMD64) Linux (All)
: not set critical
Assignee: Intel 3D Bugs Mailing List
QA Contact: Intel 3D Bugs Mailing List
Depends on:
Reported: 2019-09-08 10:13 UTC by Link Mauve
Modified: 2019-09-12 14:11 UTC (History)
0 users

See Also:
i915 platform:
i915 features:


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Description Link Mauve 2019-09-08 10:13:12 UTC
In iris_resource_from_handle(), when a Wayland client created an I915_FORMAT_MOD_Y_TILED_CCS buffer, whandle->modifier and res->bo->tiling_mode end up desynchronised, the first one being Y-tiled, the second linear, leading to the assert on line 967 to crash Weston.

I haven’t been able to figure out where this bo gets created without the proper tiling mode though, but the resource doesn’t have the CCS aux bo either.

A I915_FORMAT_MOD_Y_TILED buffer works, as does a linear one.

Running latest ArchLinux, Mesa f83f9d7daa (master), Weston master, testing with Dolphin on this PR: https://github.com/dolphin-emu/dolphin/pull/7452
Comment 1 Denis 2019-09-09 08:00:06 UTC
Hi Link, it would be helpful to have a reproducer for this issue, to have possibility to debug/investigate it
Comment 2 Link Mauve 2019-09-12 14:11:12 UTC
Hi Denis, my testcase is:
- Have Iris master built without NDEBUG, installed, and used by default on UHD 620.
- Start `weston` from TTY.
- Start any Dolphin game, or Firefox nightly with WebRender, or PyTouhou, or any other Wayland client using Y_TILED_CCS.
- See Weston crash there.

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