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From:   Michael Ellerman <mpe@ellerman.id.au>
To:     Zhouyi Zhou <zhouzhouyi@gmail.com>,
        linuxppc-dev <linuxppc-dev@lists.ozlabs.org>,
        rcu <rcu@vger.kernel.org>,
        linux-kernel <linux-kernel@vger.kernel.org>, lance@osuosl.org,
        "Paul E. McKenney" <paulmck@kernel.org>
Subject: Re: BUG : PowerPC RCU: torture test failed with __stack_chk_fail
In-Reply-To: <CAABZP2xJRGhPmfB-PrfesQKzP7fsuZsj+3TewAiLLW8u=YK4dg@mail.gmail.com>
References: <CAABZP2xJRGhPmfB-PrfesQKzP7fsuZsj+3TewAiLLW8u=YK4dg@mail.gmail.com>
Date:   Tue, 25 Apr 2023 08:07:10 +1000
Message-ID: <87cz3tylwx.fsf@mail.concordia>
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Zhouyi Zhou <zhouzhouyi@gmail.com> writes:
> Dear PowerPC and RCU developers:
> During the RCU torture test on mainline (on the VM of Opensource Lab
> of Oregon State University), SRCU-P failed with __stack_chk_fail:
...
> by debugging, I see the r10 is assigned with r13 on c000000000226eb4,
> but if there is a context-switch before c000000000226edc, a false
> positive will be reported.
>
> [1] http://154.220.3.115/logs/0422/configformainline.txt

Says:

CONFIG_CC_VERSION_TEXT="powerpc64le-linux-gnu-gcc-10 (Ubuntu 10.4.0-4ubuntu1~22.04) 10.4.0"

Do you see the same issue with a newer GCC?

There's 12.2.0 here:
  https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/12.2.0/
  https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/ppc64le/12.2.0/

Or if you can build in a Fedora 38 system or container, it has GCC 13.

cheers