From 508db6d247c2c4baef906191dc20e8939ff1f6ca Mon Sep 17 00:00:00 2001
From: Stan Ulbrych <stan@python.org>
Date: Mon, 5 Oct 2026 16:56:52 +0100
Subject: [PATCH] gh-158868: Reduce ASLR in the MSan CI job

---
 .github/workflows/reusable-san.yml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/.github/workflows/reusable-san.yml b/.github/workflows/reusable-san.yml
index da6306a50cf7bc..f63c2b89134aca 100644
--- a/.github/workflows/reusable-san.yml
+++ b/.github/workflows/reusable-san.yml
@@ -72,6 +72,8 @@ jobs:
     - name: MSan option setup
       if: inputs.sanitizer == 'MSan'
       run: |
+        sudo sysctl -w vm.mmap_rnd_bits=28  # Reduce ASLR to avoid MSan re-executing
+
         echo "MSAN_OPTIONS=${SAN_LOG_OPTION} allocator_may_return_null=1 handle_segv=0" >> "$GITHUB_ENV"
         # MSan reports false positives for memory initialized by libraries
         # that are not built with MSan, so disable modules that use them.