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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Date:   Thu, 27 Aug 2020 17:06:38 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Viresh Kumar <viresh.kumar@...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>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        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>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Lars Povlsen <lars.povlsen@...rochip.com>,
        madhuparnabhowmik10@...il.com
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 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.
Link to test job,
https://lkft.validation.linaro.org/scheduler/job/1715677#L1886

- Naresh