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From:   Zhouyi Zhou <zhouzhouyi@gmail.com>
Date:   Thu, 27 Apr 2023 17:21:02 +0800
Message-ID: <CAABZP2z=xu+07-y5fqFLidZz1VpSgrSwXa1mFHPb=b3Ezr3OtA@mail.gmail.com>
Subject: Re: BUG : PowerPC RCU: torture test failed with __stack_chk_fail
To:     Michael Ellerman <mpe@ellerman.id.au>
Cc:     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>
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On Thu, Apr 27, 2023 at 11:09=E2=80=AFAM Michael Ellerman <mpe@ellerman.id.=
au> wrote:
>
> Zhouyi Zhou <zhouzhouyi@gmail.com> writes:
> > On Tue, Apr 25, 2023 at 2:01=E2=80=AFPM Zhouyi Zhou <zhouzhouyi@gmail.c=
om> wrote:
> >> On Tue, Apr 25, 2023 at 6:07=E2=80=AFAM Michael Ellerman <mpe@ellerman=
.id.au> wrote:
> ...
> >> >
> >> > 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/ppc6=
4le/12.2.0/
>
> > powerpc64le-linux-gnu-gcc-12 cross compiler on my Ubuntu 22.04 does
> > not seem to have that issue as gcc-10 does
>
> OK. So so far it's only that GCC 10 that shows the problem.
>
> If you have time, you could use some of the other versions to narrow
> down which versions show the bug:
>
>   https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/ppc64le/
>
> There's an 11.0, 11.1 and 11.3 there, as well as 9.5 and so on.
GCC test results (Tested on PPC VM of Open Source Lab of Oregon State
University)
gcc 9.4 (ubuntu native):          positive, show bug
gcc 9.5 (download form [1]):   positive, show bug
gcc 10.1 (download from [1]): positive, show bug
gcc 10.3 (download from [1]): positive, show bug
gcc 10.4 (download from [1]): positive, show bug

gcc 11.0 (download from [1]): negative, no bug
gcc 11.1 (download from [1]): negative, no bug
gcc 11.3 (download from [1]): negative, no bug
gcc 12.1 (download from [1]): negative, no bug
gcc 12.2 (download from [1]): negative, no bug

[1] https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/ppc64le/

I am very happy to cooperate if there is further need ;-)
Cheers
Zhouyi
>
> There's