Hello! My laptop (ThinkPad T460) seems to have a memory corruption issue that only occures when the gpu is in use (it has `Intel Corporation Skylake GT2 [HD Graphics 520] (rev 07)` as reported by lspci). I haven't been able to reproduce the corruption with standard memory testing utilities like lenovo's builtin hardware diagnostic tool, memtest86+, or even the user-space program memtester when it's the only thing running. However, running memtester alongside vkmark for example can reproduce it quite consistently. It will always be a single address for a given instance of memtester, but looking into /proc/[pid]/pagemap revealed that seemingly it's always the same hardware address. With this information, I think I managed to stop it from happening by appending `memmap=4K$0x1F9D7C000` to my kernel commandline to stop that address from being allocated. Since then I haven't been able to catch it with memtester, but I did have a crash that kinda resembled the ones I had earlier. Many processes segfaulted and I had some `Bad swap file entry` errors in my dmesg. I haven't been able to do testing on other OSes yet, but since none of the regular memtests have found any issues, I'm fairly certain this is not a hardware issue with my ram. Could still be a hardware issue with the gpu itself, but for now I'm guessing this is a gpu driver bug. Is there anything else I can test to confirm that this is i915's fault, and if so, anything I can do to help track down the bug? Thanks!
