diff --git a/.github/workflows/build-and-test.yml b/.github/workflows/build-and-test.yml
index 027f142e3b1..9366970e6c1 100644
--- a/.github/workflows/build-and-test.yml
+++ b/.github/workflows/build-and-test.yml
@@ -142,6 +142,14 @@ jobs:
       if:   matrix.m32 == ''
       run:  sudo apt install -y libunbound-dev libunwind-dev
 
+    - name: Reduce ASLR entropy
+      if:   matrix.asan != '' || matrix.ubsan != ''
+      # Asan in llvm 14 provided in ubuntu-22.04 is incompatible with
+      # high-entropy ASLR configured in much newer kernels that GitHub
+      # runners are using leading to random crashes:
+      #   https://github.com/actions/runner-images/issues/9491
+      run: sudo sysctl -w vm.mmap_rnd_bits=28
+
     - name: prepare
       run:  ./.ci/linux-prepare.sh