Re: Valgrind-3.22.0.RC2 is available for testing

I have uploaded two possible fixes but I'm unable to test them.  If someone
is able to reproduce this bug faithfully, can you try each patch below and
let me know if it works?  You can apply the patch with `git am <filename>'.

Download these:

https://bugs.kde.org/attachment.cgi?id=162607 (I prefer this one.)
https://bugs.kde.org/attachment.cgi?id=162608 (If that one doesn't work,
maybe this one?)

To test, you can run this:

./autogen.sh && ./configure && make -j 20 && make -j 20 check && valgrind
-q --expensive-definedness-checks=yes memcheck/tests/vbit-test/vbit-test

Thanks for trying it!  Eager to hear back from you!

Eyal

On Fri, Oct 27, 2023 at 8:04 AM Andreas Arnez via Valgrind-developers <
valgrind-developers-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org> wrote:

> On Fri, Oct 27 2023, Mark Wielaard wrote:
>
> > = On Fedora 38 s390x
> >
> > == 842 tests, 1 stderr failure, 0 stdout failures, 0 stderrB failure, 0
> stdoutB failure, 0 post failures ==
> > memcheck/tests/vbit-test/vbit-test       (stderr)
> >
> > --- vbit-test.stderr.exp               2022-02-09 22:47:30.491170867
> +0000
> > +++ vbit-test.stderr.out               2023-10-26 22:51:38.544254194
> +0000
> > @@ -0,0 +1,3 @@
> > +Conditional jump or move depends on uninitialised value(s)
> > +   ...
> > +
> >
> > I believe I saw this with 3.21.0 too.
>
> Right.  It's a known issue caused by a memcheck-unfriendly compiler
> decision.  See
>
>   https://bugs.kde.org/show_bug.cgi?id=417993
>
> There's probably a way of fixing this in ir_opt.c.  Would someone be
> interested in reviewing a patch?
>
> --
> Andreas
>
>
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