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

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Message-ID: <CANk7y0imD3tK1Jox_V_f1vfzFi2tPhUzGOA_mLLkYy-VDHdncg@mail.gmail.com>
Date:   Wed, 21 Jun 2023 16:16:41 +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 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?

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?

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