linux-kernel - Re: next: Rpi4: Unexpected kernel BRK exception at EL1

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Message-ID: <CANk7y0g9Qhe4H+WTbrsEUa_XXn_GkXWDOE4kP1icbxfJyri8XQ@mail.gmail.com>
Date:   Wed, 21 Jun 2023 17:19:41 +0200
From:   Puranjay Mohan <puranjay12@...il.com>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Alexei Starovoitov <ast@...nel.org>,
        Song Liu <song@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        linux-rpi-kernel@...ts.infradead.org,
        Netdev <netdev@...r.kernel.org>, lkft-triage@...ts.linaro.org,
        Arnd Bergmann <arnd@...db.de>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        bpf <bpf@...r.kernel.org>
Subject: Re: next: Rpi4: Unexpected kernel BRK exception at EL1

Hi,

On Wed, Jun 21, 2023 at 4:41 PM Naresh Kamboju
<naresh.kamboju@...aro.org> wrote:
>
> On Wed, 21 Jun 2023 at 19:46, Puranjay Mohan <puranjay12@...il.com> wrote:
> >
> > Hi,
> >
> > On Wed, Jun 21, 2023 at 3:39 PM Naresh Kamboju
> > <naresh.kamboju@...aro.org> wrote:
> > >
> > > On Wed, 21 Jun 2023 at 18:27, Mark Rutland <mark.rutland@....com> wrote:
> > > >
> > > > On Wed, Jun 21, 2023 at 06:06:51PM +0530, Naresh Kamboju wrote:
> > > > > Following boot warnings and crashes noticed on arm64 Rpi4 device running
> > > > > Linux next-20230621 kernel.
> > > > >
> > > > > Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
> > > > >
> > > > > boot log:
> > > > >
> > > > > [   22.331748] Kernel text patching generated an invalid instruction
> > > > > at 0xffff8000835d6580!
> > > > > [   22.340579] Unexpected kernel BRK exception at EL1
> > > > > [   22.346141] Internal error: BRK handler: 00000000f2000100 [#1] PREEMPT SMP
> > > >
> > > > This indicates execution of AARCH64_BREAK_FAULT.
> > >
> > > I see kernel panic with kselftest merge configs on Juno-r2 and Rpi4.
> >
> > Is there a way to reproduce this setup on Qemu?
>
> Not reproducible on Qemu-arm64.
> I see only on arm64 devices Juno-r2 and Rpi4.
>
> >
> > I am able to build the linux-next kernel with the config given below.
> > But the bug doesn't reproduce in Qemu with debian rootfs.
> >
> > I guess I would need the Rootfs that is being used here to reproduce it.
> > Can you point me to the rootfs for this?
>
> Here is the link for rootfs - OE one.
> https://storage.tuxsuite.com/public/linaro/lkft/oebuilds/2RVA7dHPf73agY0gDJD6XEdBQBI/images/juno/

I tested this rootfs and couldn't reproduce on Qemu. Now, I will try
to use my raspberry pi and try to reproduce this.

Thanks.

>
> >
> > Thanks,
> > Puranjay
> >
> > > metadata:
> > >   git_ref: master
> > >   git_repo: https://gitlab.com/Linaro/lkft/mirrors/next/linux-next
> > >   git_sha: 15e71592dbae49a674429c618a10401d7f992ac3
> > >   git_describe: next-20230621
> > >   kernel_version: 6.4.0-rc7
> > >   kernel-config:
> > >     https://storage.tuxsuite.com/public/linaro/lkft/builds/2RVAA4lj35ia3YDkqaoV6ztyqdW/config
> > >   artifact-location:
> > >     https://storage.tuxsuite.com/public/linaro/lkft/builds/2RVAA4lj35ia3YDkqaoV6ztyqdW/
> > >   toolchain: gcc-11
> > >   build_name: gcc-11-lkftconfig-kselftest
> > >
> > >
> > > --
> > > Linaro LKFT
> > > https://lkft.linaro.org
>
> - Naresh



--
Thanks and Regards

Yours Truly,

Puranjay Mohan