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From:   Naresh Kamboju <naresh.kamboju@linaro.org>
Date:   Wed, 17 Mar 2021 16:56:15 +0530
Message-ID: <CA+G9fYv9kwQDYzzA1e=c8kg1wWQ1MwKtintBvyqMiKG5S+ggqA@mail.gmail.com>
Subject: Re: BUG: KFENCE: memory corruption in usb_get_device_descriptor
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     open list <linux-kernel@vger.kernel.org>,
        linux-usb@vger.kernel.org, lkft-triage@lists.linaro.org,
        Alan Stern <stern@rowland.harvard.edu>,
        "Gustavo A. R. Silva" <gustavoars@kernel.org>,
        Jason Yan <yanaijie@huawei.com>,
        "Ahmed S. Darwish" <a.darwish@linutronix.de>,
        Oliver Neukum <oneukum@suse.com>,
        Eugeniu Rosca <erosca@de.adit-jv.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Anders Roxell <anders.roxell@linaro.org>
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On Wed, 17 Mar 2021 at 15:34, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> On Wed, Mar 17, 2021 at 02:28:40PM +0530, Naresh Kamboju wrote:
> > While booting Linux mainline master 5.12.0-rc2 and 5.12.0-rc3 on arm64
> > Hikey device the following KFENCE bug was found.
> >
> > Recently, we have enabled CONFIG_KFENCE=y and started seeing this crash.
> > kernel BUG log:
>
> What USB traffic are you having here?

This is  getting triggered while booting the device.
We are not running any traffic.

>
> And has this ever not triggered?

No.
It was not triggered before.
Since CONFIG_KFENCE=y is added to our builds recently we are able to
reproduce always on recent builds.

Steps to reproduce:
1) Build arm64 kernel Image with this given config.
      - tuxmake --runtime podman --target-arch arm64 --toolchain gcc-9
--kconfig defconfig --kconfig-add
https://builds.tuxbuild.com/1pfztfszUNcDwOAyMrw2wPMKNfc/config
2) Boot arm64 hikey hi6220 device
3) While booting the device you will get to see this kernel BUG:

[   18.243075] BUG: KFENCE: memory corruption in
usb_get_device_descriptor+0x80/0xb0
[   18.813861] BUG: KFENCE: memory corruption in
__usbnet_read_cmd.isra.0+0xd0/0x1a0

link:
https://qa-reports.linaro.org/lkft/linux-mainline-master/build/v5.12-rc2-487-gf296bfd5cd04/testrun/4155170/suite/linux-log-parser/test/check-kernel-bug-2388200/log

- Naresh