** Changed in: mesa (Ubuntu Focal)
Status: Incomplete => Triaged
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https://bugs.launchpad.net/bugs/1950174
Title:
[SRU] focal: gallium: Reset {d,r}Priv in dri_unbind_context
Status in mesa package in Ubuntu:
Fix Released
Status in mesa source package in Focal:
Triaged
Bug description:
[Description]
This is a request to backport this fix from mesa 21.1 to focal-updates which
is affecting users of WSL:
https://gitlab.freedesktop.org/mesa/mesa/-/commit/7ff30a0499bd872d77b0f377414bbc03463b9f87
This cached stale pointer is causing various chromium applications
(Edge, Chrome, Visual Studio Code, etc…) to hang on resize when vGPU
is enabled in WSLg. We’re getting incredibly unlucky because a glx
drawable is being freed and reallocated with exactly the same heap
pointers during a resize, which is causing Mesa to think the new
drawable is already fully initialized when binded to the context, but
it is not true and only because the new drawable is matching the old
stale pointer for the previously freed drawable… and as a result the
context remain invalid and the app is unable to present.
With the push of WDDMv3 drivers which expose vGPU in WSL, the number
of users hitting this issue is increasing.
[Test Case]
On Windows 11 with WSLg and Ubuntu 20.04
1. Verify that hardware acceleration is enable either with glxinfo -B or in
edge with edge://gpu
2. Install and launch chrome, edge or vscode
3. Resize the windows repeatedly
Verification:
The app must not crash or hang.
[What could go wrong]
The patch resets two pointers to NULL in dri_unbind_context(), which
is correct for that function and can't regress anything else.
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