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Message-ID: <CA+G9fYs2y4RvOEOJ2qwX=O98j7sgkQJ+jZucd28wPUj6L-vN2A@mail.gmail.com>
Date: Thu, 25 May 2023 19:05:49 +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
On Mon, 22 May 2023 at 22:11, Will Deacon <will@...nel.org> wrote:
>
> Naresh,
>
> On Tue, May 16, 2023 at 02:44:49PM +0100, Will Deacon wrote:
> > 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?
>
> FWIW, I've been trying (and failing) all day to reproduce this in QEMU.
> I matched the same VL configuration as you have in the fastmodel and
> tried enabling additional memory debugging options too, but I'm yet to
> see a kfence splat (or any other splat fwiw).
Thanks for trying it out.
I have shared log [Log link] below on Linux next-20230314 which is the
starting point of BUG that we started noticing and that is raw log showing
FVP log with all -C details.
>
> How often do you see this?
Our CI system running selftests: arm64 - subtests by using
./run_kselftest.sh -c arm64
With full selftests: arm64 the probability of occurrence is 40%.
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.
More details (on previous email),
- https://lore.kernel.org/all/CA+G9fYtZjGomLjDi+Vf-hdcLpKPKbPmn4nwoPXvn24SG2hEJMg@mail.gmail.com/
- https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230314/testrun/15566007/suite/log-parser-test/test/check-kernel-bug-
9588df685892e898be8969def31c5aa074b2faada33f12ebc88fd7e7b52893cd/details/
Log link:
- https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230314/testrun/15566007/suite/log-parser-test/test/check-kernel-bug-9588df685892e898be8969def31c5aa074b2faada33f12ebc88fd7e7b52893cd/log
>
> Will
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