diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 4c830957a91e64735ed024a9f461f50c1afc9cba..71b94967610278ed98a35a9f86d8141b15a63339 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -145,7 +145,7 @@ workflow:
     - make clean
     - make -j CLANG=$CLANG_NUM
     - testcase_timeout=$SELFTEST_SANITY_TIMEOUT
-    - export UBSAN_OPTIONS=suppressions=scripts/ubsan.supp,report_error_type=1
+    - export UBSAN_OPTIONS=suppressions=scripts/ubsan.supp,report_error_type=1,print_stacktrace=1
 
     - exit_code20=0
     - exit_code10=0
@@ -608,7 +608,7 @@ renderer-usan:
   variables:
     SANITIZER_BUILD_STRING: "usan"
   script:
-    - UBSAN_OPTIONS=suppressions=scripts/ubsan.supp,report_error_type=1 python3 -m pytest -q --tb=no -n auto --html=report.html --self-contained-html --junit-xml=report-junit.xml tests/renderer/test_renderer.py tests/split_rendering/test_split_rendering.py --testcase_timeout=$testcase_timeout
+    - UBSAN_OPTIONS=suppressions=scripts/ubsan.supp,report_error_type=1,print_stacktrace=1 python3 -m pytest -q --tb=no -n auto --html=report.html --self-contained-html --junit-xml=report-junit.xml tests/renderer/test_renderer.py tests/split_rendering/test_split_rendering.py --testcase_timeout=$testcase_timeout
   artifacts:
     expose_as: "renderer usan result"