https://bugs.freedesktop.org/show_bug.cgi?id=60086
Priority: medium
Bug ID: 60086
Assignee: mesa-dev@lists.freedesktop.org
Summary: Wayland platform backend crashes if there's no back
buffer during dri2_swap_buffers
Severity: normal
Classification: Unclassified
OS: Linux (All)
Reporter: antogno...@gmail.com
Hardware: x86-64 (AMD64)
Status: NEW
Version: unspecified
Component: Other
Product: Mesa
Created attachment 73945
--> https://bugs.freedesktop.org/attachment.cgi?id=73945&action=edit
Swap buffer when a segv happens.
When using the Wayland platform backend of Mesa, if there's no call to any
rendering/drawing function, there will be no back buffer present (it should be
NULL). This causes any call to dri2_swap_buffers to segfault, since it accesses
dri2_surf->back->age.
The egl semantics is that the back buffer is undefined at this situation, maybe
presenting only garbage when the swap buffer is done, but it should not crash.
This segfault behavior was reproduced when using the Wayland backend of EFL,
and a test program was written with a window and a canvas, without any objects
on it. It would trigger a swap buffer but no call was done to allocate a back
buffer.
There's a backtrace attached to this bug that shows where the error happens.
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