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From:   Michael Ellerman <patch-notifications@ellerman.id.au>
To:     Marco Elver <elver@google.com>, Dmitry Vyukov <dvyukov@google.com>,
        kasan-dev@googlegroups.com, Nicholas Piggin <npiggin@gmail.com>,
        Christophe Leroy <christophe.leroy@csgroup.eu>
Cc:     linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
In-Reply-To: <57834a703dfa5d6c27c9de0a01329059636e5ab7.1685080579.git.christophe.leroy@csgroup.eu>
References: <57834a703dfa5d6c27c9de0a01329059636e5ab7.1685080579.git.christophe.leroy@csgroup.eu>
Subject: Re: [PATCH] powerpc/kcsan: Properly instrument arch_spin_unlock()
Message-Id: <168836201884.50010.3433894878909493070.b4-ty@ellerman.id.au>
Date:   Mon, 03 Jul 2023 15:26:58 +1000
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On Fri, 26 May 2023 07:57:33 +0200, Christophe Leroy wrote:
> The following boottime error is encountered with SMP kernel:
> 
>   kcsan: improperly instrumented type=(0): arch_spin_unlock(&arch_spinlock)
>   kcsan: improperly instrumented type=(0): spin_unlock(&test_spinlock)
>   kcsan: improperly instrumented type=(KCSAN_ACCESS_WRITE): arch_spin_unlock(&arch_spinlock)
>   kcsan: improperly instrumented type=(KCSAN_ACCESS_WRITE): spin_unlock(&test_spinlock)
>   kcsan: improperly instrumented type=(KCSAN_ACCESS_WRITE | KCSAN_ACCESS_COMPOUND): arch_spin_unlock(&arch_spinlock)
>   kcsan: improperly instrumented type=(KCSAN_ACCESS_WRITE | KCSAN_ACCESS_COMPOUND): spin_unlock(&test_spinlock)
>   kcsan: selftest: test_barrier failed
>   kcsan: selftest: 2/3 tests passed
>   Kernel panic - not syncing: selftests failed
> 
> [...]

Applied to powerpc/next.

[1/1] powerpc/kcsan: Properly instrument arch_spin_unlock()
      https://git.kernel.org/powerpc/c/396f2b0106ff343c61f7ae221dc6ae300f807760

cheers