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

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Message-ID: <20230522164117.GA6342@willie-the-truck>
Date:   Mon, 22 May 2023 17:41:17 +0100
From:   Will Deacon <will@...nel.org>
To:     Naresh Kamboju <naresh.kamboju@...aro.org>, broonie@...nel.org
Cc:     "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

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).

How often do you see this?

Will