Re: [PATCH -next resend v3] mm: hwposion: support recovery from ksm_might_need_to_copy()

[Andrew Morton]

On Tue, 13 Dec 2022 20:05:23 +0800 Kefeng Wang <wangkefeng.wang@xxxxxxxxxx> 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 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.

I believe we're awaiting a v4 of this?

Did we consider a -stable backport?  "kernel crash" sounds undesirable...

Can we identify a Fixes: target for this?

Thanks.