Re: BUG : PowerPC RCU: torture test failed with __stack_chk_fail

Zhouyi Zhou [off-list ref] writes:

On Thu, Apr 27, 2023 at 11:09 AM Michael Ellerman [off-list ref] wrote:

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Zhouyi Zhou [off-list ref] writes:

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On Tue, Apr 25, 2023 at 2:01 PM Zhouyi Zhou [off-list ref] wrote:

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On Tue, Apr 25, 2023 at 6:07 AM Michael Ellerman [off-list ref] wrote:

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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/

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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

Awesome work.

How are you testing for presence/absence of the bug? By running your
test and seeing if it crashes, or by looking at the generated code?

cheers