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:   Fri, 28 Aug 2020 14:23:02 +0200
From:   Ulf Hansson <ulf.hansson@...aro.org>
To:     Anders Roxell <anders.roxell@...aro.org>
Cc:     Naresh Kamboju <naresh.kamboju@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        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
Subject: Re: Kernel panic : Unable to handle kernel paging request at virtual
 address - dead address between user and kernel address ranges

On Fri, 28 Aug 2020 at 12:29, Anders Roxell <anders.roxell@...aro.org> wrote:
>
> On Fri, 28 Aug 2020 at 11:35, Ulf Hansson <ulf.hansson@...aro.org> wrote:
> >
> > On Fri, 28 Aug 2020 at 11:22, Naresh Kamboju <naresh.kamboju@...aro.org> wrote:
> > >
> > > 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>
> >
> > 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.
>
> I tried to run with a kernel from your tree and I could see the same
> kernel panic on db410c [1].

Anders, Naresh - thanks for testing and reporting. I am dropping the
patch from my tree.

Viresh, I suggest to keep Anders/Naresh in the cc, for the next
version. Then I can wait for their tested-by tag before I apply again.

Kind regards
Uffe