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

[Philippe Mathieu-Daudé]

On 13/1/23 18:10, Alex Bennée wrote:
> Peter Maydell <peter.maydell@linaro.org> writes:
>
> > 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

Yet again:
https://gitlab.com/qemu-project/qemu/-/jobs/3608436731

> Interesting those are both with plugins. I wonder if the tsan plugin
> fixes in my latest tree help?