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bh=QVZYq2PBPO60+hzu+DH/FiN1wZH0KS7M3eptGgjOhVE=; b=AEmYhvNblcwqu3ZNbpxu4dHMOnGZTh4PuVez7ZSFYKmHPUVgknWewPIlUfRqiq2gxh TDSwfbvzM16hkK7deNHoJ6v0iWgxH+0vgHUGvr6DsaiyvHckrJ1aN7MUNq4ibjwavvsa k8L082D6Bl8xuF7YDR/hiMWEFh7MCN7m7LO1bUvt+BAtzVeG8nZzvw8MigL9qig6yPCa ETCH62oYcE/sAHyo3omkI0KggFMhgRnG1MdlCnlr3E9syFt/9qIKeqaiyzrgqk+/q5wT IlxiPRyZEqOCgNwKMVf8GdFmlWb8WolhWEZYG4aUrfQpNeiBu8H4rA33L6WwbNr67NxV hhmw== X-Gm-Message-State: AOAM530a6G1uEsgoQ5u8iQyhk31hLuYYt/za+YhQHdzep0obzvVj3rWI tFf9HmVWsu8cyPymjYDjnaSC9ZBK7lqMGa9hxZq/uA== X-Google-Smtp-Source: ABdhPJz+qwt3X7HgwHyJ4lpLawfdxGagKrMWAvsaV5ZAG+gYUecbHreIkxf2KT8piK7zCbe9pYFyRHUfVwV16+Iet6Q= X-Received: by 2002:ac2:58c6:: with SMTP id u6mr481701lfo.105.1598610571828; Fri, 28 Aug 2020 03:29:31 -0700 (PDT) MIME-Version: 1.0 References: <20200827090813.fjugeqbb47fachy7@vireshk-i7> <20200827101231.smqrhqu5da6jlz6i@vireshk-i7> In-Reply-To: From: Anders Roxell Date: Fri, 28 Aug 2020 12:29:20 +0200 Message-ID: Subject: Re: Kernel panic : Unable to handle kernel paging request at virtual address - dead address between user and kernel address ranges To: Ulf Hansson Cc: Naresh Kamboju , Viresh Kumar , Stephen Rothwell , Arnd Bergmann , Rajendra Nayak , open list , Linux-Next Mailing List , linux-clk , linux-mmc , lkft-triage@lists.linaro.org, John Stultz , Daniel Lezcano , Michael Turquette , Stephen Boyd , Lars Povlsen , madhuparnabhowmik10@gmail.com Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 28 Aug 2020 at 11:35, Ulf Hansson wrote: > > On Fri, 28 Aug 2020 at 11:22, Naresh Kamboju wrote: > > > > On Thu, 27 Aug 2020 at 17:06, Naresh Kamboju wrote: > > > > > > On Thu, 27 Aug 2020 at 15:42, Viresh Kumar 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 > > Reported-by: Anders Roxell > > 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