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From: Anders Roxell <anders.roxell@linaro.org>
To: Ulf Hansson <ulf.hansson@linaro.org>
Cc: Naresh Kamboju <naresh.kamboju@linaro.org>,
	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
Subject: Re: Kernel panic : Unable to handle kernel paging request at virtual address - dead address between user and kernel address ranges
Date: Fri, 28 Aug 2020 12:29:20 +0200	[thread overview]
Message-ID: <CADYN=9K3D3OZ5T_K+6MfcgVLRoktPB6LvwDiXGj-+Zpq3faYfg@mail.gmail.com> (raw)
In-Reply-To: <CAPDyKFrpOqpBiSvkvO7sXHiQDOwdXYmx-80Ji5wW79QF-MrOuQ@mail.gmail.com>

On Fri, 28 Aug 2020 at 11:35, Ulf Hansson <ulf.hansson@linaro.org> wrote:
>
> 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.

I tried to run with a kernel from your tree and I could see the same
kernel panic on db410c [1].

Cheers,
Anders
[1] https://lkft.validation.linaro.org/scheduler/job/1717770#L1912

  parent reply	other threads:[~2020-08-28 10:29 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-27  8:32 Kernel panic : Unable to handle kernel paging request at virtual address - dead address between user and kernel address ranges Naresh Kamboju
2020-08-27  9:08 ` Viresh Kumar
2020-08-27  9:48   ` Arnd Bergmann
2020-08-27 10:12     ` Viresh Kumar
2020-08-27 11:36       ` Naresh Kamboju
2020-08-28  9:22         ` Naresh Kamboju
2020-08-28  9:34           ` Ulf Hansson
2020-08-28 10:08             ` Naresh Kamboju
2020-08-28 10:29             ` Anders Roxell [this message]
2020-08-28 12:23               ` Ulf Hansson
2020-08-31  4:46                 ` Viresh Kumar
2020-08-27  9:12 ` Naresh Kamboju

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