linux-kernel - Re: Kernel panic : Unable to handle kernel paging request at virtual address - dead address between user and kernel address ranges

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Message-ID: <CA+G9fYvSEHua0EpW64rASucWuS-U2STAZxufrfN75UDspGt2cA@mail.gmail.com>
Date:   Fri, 28 Aug 2020 14:52:37 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Viresh Kumar <viresh.kumar@...aro.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        open list <linux-kernel@...r.kernel.org>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        lkft-triage@...ts.linaro.org, John Stultz <john.stultz@...aro.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        madhuparnabhowmik10@...il.com,
        Anders Roxell <anders.roxell@...aro.org>
Subject: Re: Kernel panic : Unable to handle kernel paging request at virtual
 address - dead address between user and kernel address ranges

On Thu, 27 Aug 2020 at 17:06, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
>
> On Thu, 27 Aug 2020 at 15:42, Viresh Kumar <viresh.kumar@...aro.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@...aro.org>
Reported-by: Anders Roxell <anders.roxell@...aro.org>

>
> - Naresh