linux-kernel - Re: [PATCH -next v2] mm: hwposion: support recovery from ksm_might_need_to

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Date:   Fri, 9 Dec 2022 16:50:15 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     <naoya.horiguchi@....com>, <linux-mm@...ck.org>,
        <tony.luck@...el.com>, <linux-kernel@...r.kernel.org>,
        <linmiaohe@...wei.com>
Subject: Re: [PATCH -next v2] mm: hwposion: support recovery from
 ksm_might_need_to_copy()

On Fri, 9 Dec 2022 15:28:01 +0800 Kefeng Wang <wangkefeng.wang@...wei.com> 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,
> 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.

Thanks.  Sorry, lots of paperwork and bureaucracy:


Is a copy of the oops(?) output available?

Did someone else report this?  If so, is a Reported-by available for
that?  And a Link: for the Reported-by:, which is a coming thing.

Can we identify a Fixes: target?

Is a cc:stable appropriate?