linux-kernel - Re: Kernel NULL pointer deref and data corruptions with xfs on 6.1

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Message-ID: <CA+wXwBQur9DU7mVa961KWpL+cn1BNeZbU+oja+SKMHhEo1D0-g@mail.gmail.com>
Date:   Thu, 27 Jul 2023 11:25:33 +0100
From:   Daniel Dao <dqminh@...udflare.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-fsdevel@...r.kernel.org, Dave Chinner <david@...morbit.com>,
        kernel-team <kernel-team@...udflare.com>,
        linux-kernel <linux-kernel@...r.kernel.org>, djwong@...nel.org
Subject: Re: Kernel NULL pointer deref and data corruptions with xfs on 6.1

On Thu, Jul 27, 2023 at 4:27 AM Matthew Wilcox <willy@...radead.org> wrote:
>
> On Fri, Jul 21, 2023 at 11:49:04AM +0100, Daniel Dao wrote:
> > We do not have a reproducer yet, but we now have more debugging data
> > which hopefully
> > should help narrow this down. Details as followed:
> >
> > 1. Kernel NULL pointer deferencences in __filemap_get_folio
> >
> > This happened on a few different hosts, with a few different repeated addresses.
> > The addresses are 0000000000000036, 0000000000000076,
> > 00000000000000f6. This looks
> > like the xarray is corrupted and we were trying to do some work on a
> > sibling entry.
>
> I think I have a fix for this one.  Please try the attached.

For some reason I do not see the attached patch. Can you resend it, or
is it the same
one as in https://bugzilla.kernel.org/show_bug.cgi?id=216646#c31 ?