linux-kernel - RE: [PATCH v3 0/3] mm,hwpoison: fix sending SIGBUS for Action Required MCE

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Date:   Fri, 7 May 2021 03:37:07 +0000
From:   "Luck, Tony" <tony.luck@...el.com>
To:     Naoya Horiguchi <nao.horiguchi@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Aili Yao <yaoaili@...gsoft.com>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Oscar Salvador <osalvador@...e.de>,
        David Hildenbrand <david@...hat.com>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        Jue Wang <juew@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 0/3] mm,hwpoison: fix sending SIGBUS for Action
 Required MCE

>> I updated the series based on previous feedbacks/discussions.
>
> Tested-by: Tony Luck <tony.luck@...el.com>

Maybe this series should get a "Cc: stable" tag too?

I don't have a specific commit to provide for Fixes:, but it deals
with an issue where sometimes processes return from the machine
check handler and hit the same machine check again.

It's hard[1] to hit in v5.8, but somehow gets progressively easier in
newer versions.

-Tony

[1] Initially I thought it didn't happen at all in v5.8. Then wasted a bunch
of time trying to bisect. But my "git bisect good" responses turned out to
be randomly assigned when I just hadn't tried enough times to make the
problem show up.