Re: [PATCH 12/19] configure: added tsan support for blacklist.

[Robert Foley <robert.foley@linaro.org>]

On Sat, 23 May 2020 at 13:27, Emilio G. Cota <cota@braap.org> wrote:
>
> On Fri, May 22, 2020 at 12:07:48 -0400, Robert Foley wrote:
> > Initially put several files into blacklist that were
> > causing the most problems, namely bitops.c and bitmap.c.
> >
> > Signed-off-by: Robert Foley <robert.foley@linaro.org>
> > ---
> >  configure                 | 3 ++-
> >  tests/tsan/blacklist.tsan | 5 +++++
> >  2 files changed, 7 insertions(+), 1 deletion(-)
> >  create mode 100644 tests/tsan/blacklist.tsan
> >
> > diff --git a/configure b/configure
> > index c95c54fb48..8a86a0638d 100755
> > --- a/configure
> > +++ b/configure
> > @@ -6306,7 +6306,8 @@ if test "$have_asan" = "yes"; then
> >  fi
> >  if test "$have_tsan" = "yes" ; then
> >    if test "$have_tsan_iface_fiber" = "yes" ; then
> > -    QEMU_CFLAGS="-fsanitize=thread $QEMU_CFLAGS"
> > +    QEMU_CFLAGS="-fsanitize=thread -fsanitize-blacklist="\
> > +             "\$(SRC_PATH)/tests/tsan/blacklist.tsan $QEMU_CFLAGS"
>
> I presume the goal here is to fix these races later (my default assumption
> is that warnings == races, since most warnings are indeed races). If so,
> please consider making the suppression optional (via
> "--extra-cflags=-fsanitize-blacklist=path-to-this-file"), since that
> way the reports are likely to get more eyeballs.

Yes, the goal is to fix these later.  Will add an explanation of this in
blacklist.tsan.

We will make the blacklist optional, and also add some documentation
on how to use the blacklist in the TSan section of testing.rst.

Thanks & Regards,
-Rob

>
> Thanks,
>
>                 E.