The output of dmesg when the crash occurs is: [106117.559369] radeon_gem_object_create:62 alloc size 512Mb bigger than 256Mb limit [106117.559470] radeon_gem_object_create:62 alloc size 512Mb bigger than 256Mb limit [106117.559714] radeon_gem_object_create:62 alloc size 512Mb bigger than 256Mb limit