Work around a TSAN issue with newer kernels

The ThreadSanitizer version currently available from Fedora 39
repositories is unable to cope with very high ASLR entropy, which is the
default in some recent Linux distributions [1].  This causes all
TSAN-enabled builds to fail on the affected systems with an error like:

    FATAL: ThreadSanitizer: unexpected memory mapping 0x7d00e0772000-0x7d00e0c00000

Work around the problem by reducing ASLR entropy for all TSAN-enabled
builds until the problem is resolved upstream.

[1] https://github.com/google/sanitizers/issues/1716

(cherry picked from commit 05b09f2b5bb68a916288f56bf627babad4055b90)

diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 50f396edb756e787a3de75bcec9f5556536c717d..9ecb38ad2fbd687833b40a841596983b858ebc2b 100644 (file)
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -273,6 +273,7 @@ stages:
   <<: *default_triggering_rules
   stage: build
   before_script:
+    - sysctl vm.mmap_rnd_bits=28 || true  # https://gitlab.isc.org/isc-projects/bind9/-/issues/4649
     - test -w "${CCACHE_DIR}" && export PATH="/usr/lib/ccache:${PATH}"
     - test -n "${OOT_BUILD_WORKSPACE}" && mkdir "${OOT_BUILD_WORKSPACE}" && cd "${OOT_BUILD_WORKSPACE}"
   script:
@@ -332,6 +333,7 @@ stages:
   <<: *default_triggering_rules
   stage: system
   before_script:
+    - sysctl vm.mmap_rnd_bits=28 || true  # https://gitlab.isc.org/isc-projects/bind9/-/issues/4649
     - *setup_interfaces
     - *setup_softhsm
   script:
@@ -387,6 +389,7 @@ stages:
   <<: *default_triggering_rules
   stage: unit
   before_script:
+    - sysctl vm.mmap_rnd_bits=28 || true  # https://gitlab.isc.org/isc-projects/bind9/-/issues/4649
     - *setup_softhsm
   script:
     - make unit
@@ -417,6 +420,7 @@ stages:
 .respdiff: &respdiff_job
   stage: system
   before_script:
+    - sysctl vm.mmap_rnd_bits=28 || true  # https://gitlab.isc.org/isc-projects/bind9/-/issues/4649
     - *configure
     - make -j${BUILD_PARALLEL_JOBS:-1} V=1
     - *setup_interfaces