linux-kernel - Re: arm64: fp-stress: BUG: KFENCE: memory corruption in fpsimd_release

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Date:   Thu, 25 May 2023 18:49:36 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     Will Deacon <will@...nel.org>
Cc:     broonie@...nel.org,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        linux-stable <stable@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        lkft-triage@...ts.linaro.org,
        Catalin Marinas <catalin.marinas@....com>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, Shuah Khan <shuah@...nel.org>,
        Anders Roxell <anders.roxell@...aro.org>
Subject: Re: arm64: fp-stress: BUG: KFENCE: memory corruption in fpsimd_release_task

Hi Will,

On Tue, 16 May 2023 at 19:14, Will Deacon <will@...nel.org> wrote:
>
> Hi Naresh,
>
> On Tue, May 16, 2023 at 11:58:40AM +0530, Naresh Kamboju wrote:
> > Following kernel BUG noticed while running selftests arm64 fp-stress
> > running stable rc kernel versions 6.1.29-rc1 and 6.3.3-rc1.
>
> Is there a known-good build so that we could attempt a bisection?

[ Sorry for the delay ]

Since this problem is intermittent, It is not easy to bisect.

On Linux next this fp-stress BUG: has been happening *intermittently* from
next-20230314 dated March 14, 2023.

On Linux stable-rc it started happening on 6.3.2-rc1 and 6.1.28-rc2.

Here is the proof showing the intermittent occurance on Linux next,
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230518/testrun/17066471/suite/log-parser-test/test/check-kernel-bug-9588df685892e898be8969def31c5aa074b2faada33f12ebc88fd7e7b52893cd/history/?page=3
 - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230518/testrun/17066471/suite/log-parser-test/test/check-kernel-bug-9588df685892e898be8969def31c5aa074b2faada33f12ebc88fd7e7b52893cd/history/?page=2
  - https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230518/testrun/17066471/suite/log-parser-test/test/check-kernel-bug-9588df685892e898be8969def31c5aa074b2faada33f12ebc88fd7e7b52893cd/history/?page=1

Here is the proof showing the intermittent occurance on stable-rc 6.3 and 6.1.
 - https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-6.3.y/build/v6.3-rc4-1628-g48aa7b4284af/testrun/16730800/suite/log-parser-test/test/check-kernel-bug-9588df685892e898be8969def31c5aa074b2faada33f12ebc88fd7e7b52893cd/history/
  - https://qa-reports.linaro.org/lkft/linux-stable-rc-linux-6.1.y/build/v6.1.22-1202-g2b7e1f92aa55/testrun/16814751/suite/log-parser-test/test/check-kernel-bug-9588df685892e898be8969def31c5aa074b2faada33f12ebc88fd7e7b52893cd/history/

- Naresh