Re: [PATCH 4/4] tests/tcg/multiarch: add vma-pthread.c

[Peter Maydell]

On Sat, 24 Dec 2022 at 15:19, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> From: Ilya Leoshkevich <iii@linux.ibm.com>
>
> Add a test that locklessly changes and exercises page protection bits
> from various threads. This helps catch race conditions in the VMA
> handling.
>
> Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
> Message-Id: <20221223120252.513319-1-iii@linux.ibm.com>
> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

I've noticed that this newly added vma-pthread test seems to
be flaky. Here's an example from a clang-user job:
https://gitlab.com/qemu-project/qemu/-/jobs/3600385176

TEST vma-pthread-with-libbb.so on aarch64
fail indirect write 0x5500b1eff0 (Bad address)
timeout: the monitored command dumped core
Aborted
make[1]: *** [Makefile:173: run-plugin-vma-pthread-with-libbb.so] Error 134

and another from a few days earlier:
https://gitlab.com/qemu-project/qemu/-/jobs/3572970612

TEST vma-pthread-with-libsyscall.so on s390x
fail indirect read 0x4000999000 (Bad address)
timeout: the monitored command dumped core
Aborted
make[1]: *** [Makefile:173: run-plugin-vma-pthread-with-libsyscall.so] Error 134

thanks
-- PMM