From: Andy Shevchenko <andy.shevchenko@gmail.com>
To: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
Lee Jones <lee.jones@linaro.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"Krogerus, Heikki" <heikki.krogerus@linux.intel.com>
Subject: Re: v5.13-rcX regression - NULL pointer dereference - MFD and software node API
Date: Sun, 20 Jun 2021 19:36:42 +0300 [thread overview]
Message-ID: <CAHp75VdSyM7JdGDhdo5t+FbmouEA7ZSOwGAtSwSRD8vTwTc+LA@mail.gmail.com> (raw)
In-Reply-To: <YM8rY5hi+zuAekg+@owl.dominikbrodowski.net>
On Sun, Jun 20, 2021 at 2:50 PM Dominik Brodowski
<linux@dominikbrodowski.net> wrote:
>
> Am Sun, Jun 20, 2021 at 02:19:44PM +0300 schrieb Andy Shevchenko:
> > On Sun, Jun 20, 2021 at 11:36 AM Dominik Brodowski
> > <linux@dominikbrodowski.net> wrote:
> > >
> > > Over a month ago, Andy Shevchenko reported and fixed a NULL pointer
> > > dereference issue introduced by commit
> > > 42e59982917a ("mfd: core: Add support for software nodes")
> > > in v5.13-rc1:
> > > https://lore.kernel.org/lkml/20210510141552.57045-1-andriy.shevchenko@linux.intel.com/
> > >
> > > A bisect shows that it is indeed commit 42e59982917a which causes boot to
> > > fail due to a NULL pointer dereference on my work laptop,
> >
> > Can you, please, be more specific? E.g. where may I find the ACPI dump
> > of your laptop, along with other information?
> > What you may prepare is (all run under root user)
> > 1. `acpidump -o laptop-$MODEL.dat` (the *.dat file)
> > 2. `grep -H 15 /sys/bus/acpi/devices/*/status`
> > 3. `dmesg`
> > 4. `cat /proc/iomem /proc/ioport`
> > 5. `lspci -nk -vv`
> >
> > (#2 and #3 are interesting to have in working and non-working cases)
> >
> > Perhaps a bug on the kernel bugzilla would be a good container for all these.
> >
> > Also it's not clear what exactly an Oops you have (I don't believe
> > it's the same).
>
> Thanks for taking a look at this issue. As it's actually a panic during
> boot which triggers before initramfs is ready, I can only provide the data
> for the "working case", i.e. with the patch causing the regression already
> reverted:
>
> https://bugzilla.kernel.org/show_bug.cgi?id=213511
>
> With commit 42e59982917a reverted, the system works just fine.
Is it possible to have any traces of the panic to be logged / photoed / etc?
> > > In my opinion, it is unfortunate that although it has been known for over a
> > > month that commit 42e59982917a is broken, the bugfix (though probably not
> > > far-reaching enough) has not yet progressed upstream.
> >
> > Which sounds like a narrow scope of the issue and supports the theory
> > of buggy tables. It may also be possible that some driver
>
> ... still, it's a regression, with a clear "git bisect" result :-(
I understand and I'm looking at this...
--
With Best Regards,
Andy Shevchenko
next prev parent reply other threads:[~2021-06-20 16:42 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-20 8:26 v5.13-rcX regression - NULL pointer dereference - MFD and software node API Dominik Brodowski
2021-06-20 11:19 ` Andy Shevchenko
2021-06-20 11:49 ` Dominik Brodowski
2021-06-20 16:36 ` Andy Shevchenko [this message]
2021-06-20 18:27 ` Andy Shevchenko
2021-06-21 8:59 ` Dominik Brodowski
2021-06-21 10:00 ` Andy Shevchenko
2021-06-21 10:37 ` Heikki Krogerus
2021-06-21 15:31 ` Dominik Brodowski
2021-06-22 8:09 ` Heikki Krogerus
2021-06-22 14:10 ` Heikki Krogerus
2021-06-22 14:36 ` Dominik Brodowski
2021-06-22 15:28 ` Andy Shevchenko
2021-06-22 17:19 ` Dominik Brodowski
2021-06-22 15:28 ` Andy Shevchenko
2021-06-22 15:30 ` Andy Shevchenko
2021-06-23 10:51 ` Heikki Krogerus
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAHp75VdSyM7JdGDhdo5t+FbmouEA7ZSOwGAtSwSRD8vTwTc+LA@mail.gmail.com \
--to=andy.shevchenko@gmail.com \
--cc=andriy.shevchenko@linux.intel.com \
--cc=heikki.krogerus@linux.intel.com \
--cc=lee.jones@linaro.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux@dominikbrodowski.net \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).