We can't use dl_iterate_phdr() here. Driver library is opened at vaInitialize() call and it crashes directly in the call when driver init is called. dl_iterate_phdr() can't catch that because libva-vdpau-driver.so is not loaded before vaInitialize() which crashes. So there's no way how to block libva-vdpau-driver.so from load. We may set LIBVA_DRIVER_NAME directly when NVIDIA/Wayland is present but that's also an ugly hack. As this crash happens on Wayland/NVIDIA and you need to explicitly force-enable it and use broken driver I'm not going to investigate it more.
Bug 1815528 Comment 10 Edit History
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We can't use dl_iterate_phdr() here. Driver library is opened at vaInitialize() call and it crashes directly in the call when driver init is called. dl_iterate_phdr() can't catch it that because libva-vdpau-driver.so is not loaded before vaInitialize() which crashes. So there's no way how to block libva-vdpau-driver.so from load. We may set LIBVA_DRIVER_NAME directly when NVIDIA/Wayland is present but that's also an ugly hack. As this crash happens on Wayland/NVIDIA and you need to explicitly force-enable it and use broken driver I'm not going to investigate it more.