linux-kernel - Re: [GIT PULL] Rare page cache data corruption fix

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Message-ID: <CAHk-=wjn-V-b=w=4GS_nJQ1nsVcJm0FPTv2Ene_xP_AWPBBFsg@mail.gmail.com>
Date:   Fri, 22 Apr 2022 13:35:03 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>
Subject: Re: [GIT PULL] Rare page cache data corruption fix

On Fri, Apr 22, 2022 at 12:45 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> Syzbot found a nasty race between large page splitting and page lookup.
> Details in the commit log, but fortunately it has a reliable reproducer.

The commit message does mention it ("I have not added a new test for
this bug."), but I'll echo it anyway, since you say it can be reliably
reproduced - getting that repro into the testsuite would be lovely.

               Linus