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

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Message-ID: <ZMJizCdbm+JPZ8gp@casper.infradead.org>
Date:   Thu, 27 Jul 2023 13:27:56 +0100
From:   Matthew Wilcox <willy@...radead.org>
To:     Daniel Dao <dqminh@...udflare.com>
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 11:25:33AM +0100, Daniel Dao wrote:
> 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 ?

Yes, that's the one, sorry.