On Wed, Feb 01, 2023 at 03:44:33PM +0800, Kefeng Wang wrote: > When the kernel copy a page from ksm_might_need_to_copy(), but runs > into an uncorrectable error, it will crash since poisoned page is > consumed by kernel, this is similar to the issue recently fixed by > Copy-on-write poison recovery. > > When an error is detected during the page copy, return VM_FAULT_HWPOISON > in do_swap_page(), and install a hwpoison entry in unuse_pte() when > swapoff, which help us to avoid system crash. Note, memory failure on > a KSM page will be skipped, but still call memory_failure_queue() to > be consistent with general memory failure process, and we could support > KSM page recovery in the feature. > > Signed-off-by: Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> Looks good to me, thank you. Reviewed-by: Naoya Horiguchi <naoya.horiguchi@xxxxxxx>
