[PATCH 3/3] gitlab: use 'setarch -R' to workaround tsan bug

["Daniel P. Berrangé" <berrange@redhat.com>]

The TSAN job started failing when gitlab rolled out their latest
release. The root cause is a change in the Google COS version used
on shared runners. This brings a kernel running with

 vm.mmap_rnd_bits = 31

which is incompatible with TSAN in LLVM < 18, which only supports
upto '28'. LLVM 18 can support upto '30', and failing that will
re-exec itself to turn off VA randomization.

Our LLVM is too old for now, but we can run with 'setarch -R make ..'
to turn off VA randomization ourselves.

Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 .gitlab-ci.d/buildtest.yml | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/.gitlab-ci.d/buildtest.yml b/.gitlab-ci.d/buildtest.yml
index bab6194564..d864562628 100644
--- a/.gitlab-ci.d/buildtest.yml
+++ b/.gitlab-ci.d/buildtest.yml
@@ -575,6 +575,9 @@ tsan-build:
     CONFIGURE_ARGS: --enable-tsan --cc=clang --cxx=clang++
           --enable-trace-backends=ust --disable-slirp
     TARGETS: x86_64-softmmu ppc64-softmmu riscv64-softmmu x86_64-linux-user
+    # Remove when we switch to a distro with clang >= 18
+    # https://github.com/google/sanitizers/issues/1716
+    MAKE: setarch -R make
 
 # gcov is a GCC features
 gcov:
-- 
2.43.0