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From:   Ulf Hansson <ulf.hansson@linaro.org>
Date:   Fri, 28 Aug 2020 11:34:47 +0200
Message-ID: <CAPDyKFrpOqpBiSvkvO7sXHiQDOwdXYmx-80Ji5wW79QF-MrOuQ@mail.gmail.com>
Subject: Re: Kernel panic : Unable to handle kernel paging request at virtual
 address - dead address between user and kernel address ranges
To:     Naresh Kamboju <naresh.kamboju@linaro.org>
Cc:     Viresh Kumar <viresh.kumar@linaro.org>,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Arnd Bergmann <arnd@arndb.de>,
        Rajendra Nayak <rnayak@codeaurora.org>,
        open list <linux-kernel@vger.kernel.org>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        linux-clk <linux-clk@vger.kernel.org>,
        linux-mmc <linux-mmc@vger.kernel.org>,
        lkft-triage@lists.linaro.org, John Stultz <john.stultz@linaro.org>,
        Daniel Lezcano <daniel.lezcano@linaro.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
        Lars Povlsen <lars.povlsen@microchip.com>,
        madhuparnabhowmik10@gmail.com,
        Anders Roxell <anders.roxell@linaro.org>
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On Fri, 28 Aug 2020 at 11:22, Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
>
> On Thu, 27 Aug 2020 at 17:06, Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
> >
> > On Thu, 27 Aug 2020 at 15:42, Viresh Kumar <viresh.kumar@linaro.org> wrote:
> > >
> > > On 27-08-20, 11:48, Arnd Bergmann wrote:
> > > > > > [    3.680477]  dev_pm_opp_put_clkname+0x30/0x58
> > > > > > [    3.683431]  sdhci_msm_probe+0x284/0x9a0
> > > >
> > > > dev_pm_opp_put_clkname() is part of the error handling in the
> > > > probe function, so I would deduct there are two problems:
> > > >
> > > > - something failed during the probe and the driver is trying
> > > >   to unwind
> > > > - the error handling it self is buggy and tries to undo something
> > > >   again that has already been undone.
> > >
> > > Right.
> > >
> > > > This points to Viresh's
> > > > d05a7238fe1c mmc: sdhci-msm: Unconditionally call dev_pm_opp_of_remove_table()
> > >
> > > I completely forgot that Ulf already pushed this patch and I was
> > > wondering on which of the OPP core changes I wrote have done this :(
> > >
> > > > Most likely this is not the entire problem but it uncovered a preexisting
> > > > bug.
> > >
> > > I think this is.
> > >
> > > Naresh: Can you please test with this diff ?
> >
> > I have applied your patch and tested but still see the reported problem.
>
> The git bisect shows that the first bad commit is,
> d05a7238fe1c mmc: sdhci-msm: Unconditionally call dev_pm_opp_of_remove_table()
>
> Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org>
> Reported-by: Anders Roxell <anders.roxell@linaro.org>

I am not sure what version of the patch you tested. However, I have
dropped Viresh's v1 and replaced it with v2 [1]. It's available for
testing at:

https://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc.git next

Can you please check if it still causes problems, then I will drop it, again.

Kind regards
Uffe

[1] https://lkml.org/lkml/2020/8/28/43