linux-kernel - Re: Regression: NULL pointer dereference after NFS_V4_2_READ

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Message-ID: <CAFX2JfmvMZ7DzD9znWeOHXywgPbUKDS1irMjUerEuborjRBpcg@mail.gmail.com>
Date:   Thu, 15 Jun 2023 09:01:05 -0400
From:   Anna Schumaker <schumaker.anna@...il.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Trond Myklebust <trondmy@...merspace.com>,
        Anna Schumaker <Anna.Schumaker@...app.com>,
        linux-nfs <linux-nfs@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "regressions@...ts.linux.dev" <regressions@...ts.linux.dev>
Subject: Re: Regression: NULL pointer dereference after NFS_V4_2_READ_PLUS
 (commit 7fd461c47)

On Thu, Jun 15, 2023 at 4:55 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> On 15/06/2023 10:52, Krzysztof Kozlowski wrote:
> > On 14/06/2023 22:55, Anna Schumaker wrote:
> >>>>> Still null ptr (built on 420b2d4 with your patch):
> >>>>
> >>>> We're through the merge window and at rc1 now, so I can spend more
> >>>> time scratching my head over your bug again. We've come up with a
> >>>> patch (attached) that adds a bunch of printks to show us what the
> >>>> kernel thinks is going on. Do you mind trying it out and letting us
> >>>> know what gets printed out? You'll need to make sure
> >>>> CONFIG_NFS_V4_2_READ_PLUS is enabled when compiling the kernel.
> >>>
> >>> The patch does not apply. I tried: v6.4-rc1, v6.4-rc5, next-20230609.
> >>
> >> Can you try the attached patch on top of my 3-patch series from the
> >> other day, and let me know what gets printed out? It adds a bunch of
> >> printk()s at strategic points to print out what is going on with the
> >> xdr scratch buffer since it's suddenly a bad memory address after
> >> working for a bit on your machine.
> >>
> >
> > Here you have entire log - attached (113 kB, I hope goes past mailing
> > lists/spam filters).
>
> As expected this bounced from the mailing lists, but I hope you got it.
> If not, let me know.

I did still receive it. Thanks!

Anna
>
> Best regards,
> Krzysztof
>