Re: Kernel WARNING via bochsdrmfb mmap

On 03/07/2016, 03:30 PM, Takashi Iwai wrote:

Hi,

Jiri Slaby reported a kernel WARNING triggered by syzkaller. It can be reliably reproduced via fbdev mmap access on bochs drm. The warning looks like below:

WARNING: CPU: 3 PID: 29356 at ../drivers/gpu/drm/ttm/ttm_bo_vm.c:265 ttm_bo_vm_open+0x11a/0x180 [ttm]()

BTW running the reproducer on my box gives: x86/PAT: ac:501 freeing invalid memtype [mem 0xe083d000-0xe083dfff]

and not the warning.

thanks,