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Date: Wed, 21 Feb 2024 19:20:11 +0000
From: Mark Brown <broonie@kernel.org>
To: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Jonathan Corbet <corbet@lwn.net>,
	Andrew Morton <akpm@linux-foundation.org>,
	Marc Zyngier <maz@kernel.org>,
	Oliver Upton <oliver.upton@linux.dev>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Arnd Bergmann <arnd@arndb.de>, Oleg Nesterov <oleg@redhat.com>,
	Eric Biederman <ebiederm@xmission.com>,
	Kees Cook <keescook@chromium.org>, Shuah Khan <shuah@kernel.org>,
	"Rick P. Edgecombe" <rick.p.edgecombe@intel.com>,
	Deepak Gupta <debug@rivosinc.com>, Ard Biesheuvel <ardb@kernel.org>,
	Szabolcs Nagy <Szabolcs.Nagy@arm.com>,
	"H.J. Lu" <hjl.tools@gmail.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>,
	Florian Weimer <fweimer@redhat.com>,
	Christian Brauner <brauner@kernel.org>,
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	kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org,
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	linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-riscv@lists.infradead.org
Subject: Re: [PATCH v8 33/38] kselftest/arm64: Add a GCS test program built
 with the system libc
Message-ID: <084d97c0-a84c-49e1-a1e2-d864dbfcce0e@sirena.org.uk>
References: <20240203-arm64-gcs-v8-0-c9fec77673ef@kernel.org>
 <20240203-arm64-gcs-v8-33-c9fec77673ef@kernel.org>
 <87sf1n7uea.fsf@linaro.org>
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On Mon, Feb 19, 2024 at 11:15:57PM -0300, Thiago Jung Bauermann wrote:

> The only issue as can be seen above is that the can_call_function test
> is failing. The child is getting a GCS Segmentation fault when returning
> from fork().

> I tried debugging it with GDB, but I don't see what's wrong since the
> address in LR matches the first entry in GCSPR. Here is the
> debug session:

I'm simply not seeing this in my testing.  There's *something* going on
somewhere, I had another report of a similarish thing elsewhere, but not
in any way that I've ever been able to reproduce.  It smells like there
might be something missing with the page tables...

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