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weston-simple-egl on Intel iris leaks memory

Running weston-simple-egl (weston 8, Ubuntu 20.04) and monitoring the memory usage simply by the GNOME system monitor shows an increase of memory over time (starts at 40.0MB, reaches 40.9MB after 30 seconds).

I've only seen this with the new Intel iris driver. So not really sure if this is a client or driver issue.

With MESA_LOADER_DRIVER_OVERRIDE=i965 weston-simple-egl this already starts with a lower memory usage of 21.1MB and stays constant for at least two minutes.

Valgrind just reports many invalid writes in iris_dri.so / i965_dri.so.

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