From 7cd318caca9dc284cfb9d7eebcd1e6fce2caecf5 Mon Sep 17 00:00:00 2001
From: Disservin <disservin.social@gmail.com>
Date: Thu, 14 Mar 2024 10:38:20 +0100
Subject: [PATCH] Fix false positives from ThreadSanitizer

Since Linux Kernel 6.5 we are getting false positives from the ci,
lower the ALSR entropy to disable ALSR, which works as a temporary
workaround.

https://github.com/google/sanitizers/issues/1716
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2056762

closes https://github.com/official-stockfish/Stockfish/pull/5115

No functional change
---
 tests/instrumented.sh | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/tests/instrumented.sh b/tests/instrumented.sh
index 2a3eadc074e..525c7e04085 100755
--- a/tests/instrumented.sh
+++ b/tests/instrumented.sh
@@ -8,6 +8,13 @@ error()
 }
 trap 'error ${LINENO}' ERR
 
+# Since Linux Kernel 6.5 we are getting false positives from the ci,
+# lower the ALSR entropy to disable ALSR, which works as a temporary workaround.
+# https://github.com/google/sanitizers/issues/1716
+# https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2056762
+sudo sysctl -w vm.mmap_rnd_bits=28
+
+
 # define suitable post and prefixes for testing options
 case $1 in
   --valgrind)