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From:   Naresh Kamboju <naresh.kamboju@linaro.org>
Date:   Wed, 20 Apr 2022 18:34:25 +0530
Message-ID: <CA+G9fYsJtp6YtDF=jHuq23BN8e=CZ-FQZm+7nYt_kG=NL5-2fQ@mail.gmail.com>
Subject: Re: [next] arm: boot failed - PC is at cpu_ca15_set_pte_ext
To:     Max Krummenacher <max.oss.09@gmail.com>
Cc:     Ard Biesheuvel <ardb@kernel.org>,
        Russell King - ARM Linux <linux@armlinux.org.uk>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        open list <linux-kernel@vger.kernel.org>,
        Linux-Next Mailing List <linux-next@vger.kernel.org>,
        lkft-triage@lists.linaro.org,
        Stephen Rothwell <sfr@canb.auug.org.au>,
        Arnd Bergmann <arnd@arndb.de>,
        Andrew Morton <akpm@linux-foundation.org>,
        max.krummenacher@toradex.com, Shawn Guo <shawnguo@kernel.org>,
        Stefano Stabellini <stefano.stabellini@xilinx.com>,
        Christoph Hellwig <hch@lst.de>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>
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Hi Max,

On Wed, 20 Apr 2022 at 13:20, Max Krummenacher <max.oss.09@gmail.com> wrote:
>
> Am Mittwoch, den 20.04.2022, 09:31 +0200 schrieb Ard Biesheuvel:
> > On Tue, 19 Apr 2022 at 12:59, Naresh Kamboju <naresh.kamboju@linaro.org> wrote:
> > > Linux next 20220419 boot failed on arm architecture qemu_arm and BeagleBoard
> > > x15 device.
> > >
> > > kernel crash log from x15:
> > > -----------------
> > > [    6.866516] 8<--- cut here ---
> > > [    6.869598] Unable to handle kernel paging request at virtual
> > > address f000e62c

<trim>

> > Unfortunately, the vmlinux.xz file I downloaded from the link below
> > seems to be different from the one that produced the crash, given that
> > the LR address of c04cfeb8 does not seem to correspond with
> > handle_mm_fault+0x60c/0xed0.
> >
> > Can you please double check the artifacts?
>
> Commit "mm: check against orig_pte for finish_fault()" introduced this,
> i.e. on yesterdays next reverting a066bab3c0eb made a i.MX6 boot again.

Thanks for the pointers,
I have reverted the suggested commit and boot pass now.

Revert "mm: check against orig_pte for finish_fault()"
       This reverts commit a066bab3c0eb8f6155257f1345f07d1f6550bc4a.

> A fix is discussed here:
> https://lore.kernel.org/all/YliNP7ADcdc4Puvs@xz-m1.local/
>
> Max

- Naresh