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bh=/mdittT6+6EzCIerCsP+eMrYewGCwnIzPurZ3euQ7cw=; b=Co5OXjVI7DEw2w38eBxc9MzattPdQQVbm3SPL9CMJvqBhCDg/ATwbEfQEiuD1DCVp1 mcYaNIYRny4Ejd/eB0n5LD8LtrxLEg/xrlISGpG4oxOsSLscBmVkKLIVkrH53V5AIOeL iJMnh8LLYzlYA1wtqqg1Z4ReXrhcRKlIrH81jK+6+s5gremrzvGi2DNAc73+Clwch2PX de9UIk4BK+SXvDjbzta/vLwe7D+RjTEI8jVx1rCtYpyFRB06ePSJs4EbA2jIlHKxKFbt E3CKzWZAJuoorcEkTn/KywAimgO7nItGWn4SJTEmip14HzhQyUuzVZG+ZNqeVFHSQHDX kHww== X-Gm-Message-State: AOAM533AyFUHQSCHqP/9zx5n0Ezqq1MULATyu+fJZT4EKgKS4gaf3iLf fzLla9kzCW3Wr3edzDl6MtZKd4LPW686/7ZovZtZ8Q== X-Google-Smtp-Source: ABdhPJzxNEeZfoY+k3gp0uBoTm4yCYE5kPlcV9PGhfGkgvhiqDyqVKsddEc6lWq8Z8xFJlOpwC9vsbIVbRpsPgjPmsM= X-Received: by 2002:ab0:3114:: with SMTP id e20mr380470ual.104.1598607324469; Fri, 28 Aug 2020 02:35:24 -0700 (PDT) MIME-Version: 1.0 References: <20200827090813.fjugeqbb47fachy7@vireshk-i7> <20200827101231.smqrhqu5da6jlz6i@vireshk-i7> In-Reply-To: From: Ulf Hansson Date: Fri, 28 Aug 2020 11:34:47 +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: Naresh Kamboju Cc: 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, Anders Roxell 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 11:22, 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. Kind regards Uffe [1] https://lkml.org/lkml/2020/8/28/43