diff --git a/.azure-pipelines.yml b/.azure-pipelines.yml
index bdcfe1c9864..1d5127ae5a1 100644
--- a/.azure-pipelines.yml
+++ b/.azure-pipelines.yml
@@ -77,7 +77,7 @@ jobs:
     displayName: Cache Python Libraries
 
   - bash: |
-      set -eu -o pipefail
+      set -o nounset errexit pipefail
       cat /proc/cpuinfo | grep "model name" | sort -u
       df -h
       echo 'Acquire::Retries "3";' | sudo tee /etc/apt/apt.conf.d/80-retries
@@ -146,9 +146,10 @@ jobs:
     displayName: 'Install dependencies'
 
   - bash: |
-      set -eu -o pipefail
+      # set options
+      set -o nounset errexit pipefail
+      # display disk space usage
       df -h
-
       # configure
       export AMReX_CMAKE_FLAGS="-DAMReX_ASSERTIONS=ON -DAMReX_TESTING=ON"
       cmake -S . -B build       \
@@ -156,15 +157,25 @@ jobs:
         ${WARPX_CMAKE_FLAGS}    \
         -DWarpX_TEST_CLEANUP=ON \
         -DWarpX_TEST_FPETRAP=ON
-
       # build
       cmake --build build -j 2
+      # display disk space usage
       df -h
     displayName: 'Build'
 
   - bash: |
-      set -eu -o pipefail
-
+      # set options
+      set -o nounset errexit pipefail
       # run tests (exclude pytest.AMReX when running Python tests)
       ctest --test-dir build --output-on-failure -E AMReX
     displayName: 'Test'
+
+  - bash: |
+      # set options
+      set -o nounset errexit pipefail
+      # find and print backtrace
+      find build/bin/ -type f -name "Backtrace*" \
+        -exec echo -e "\nBacktrace\n---------\n{}\n---------" \; \
+        -exec cat {} \;
+    displayName: 'Logs'
+    condition: always()
diff --git a/Examples/CMakeLists.txt b/Examples/CMakeLists.txt
index f36bcbb9973..728c2142932 100644
--- a/Examples/CMakeLists.txt
+++ b/Examples/CMakeLists.txt
@@ -198,7 +198,7 @@ function(add_warpx_test
     if(WarpX_TEST_CLEANUP)
         add_test(
             NAME ${name}.cleanup
-            COMMAND ${CMAKE_COMMAND} -E rm -rf ${THIS_WORKING_DIR}
+            COMMAND ${CMAKE_COMMAND} -P ${CMAKE_SOURCE_DIR}/Examples/test_cleanup.cmake ${THIS_WORKING_DIR}
         )
         # test cleanup depends on test run
         set_property(TEST ${name}.cleanup APPEND PROPERTY DEPENDS "${name}.run")
diff --git a/Examples/test_cleanup.cmake b/Examples/test_cleanup.cmake
new file mode 100644
index 00000000000..b15e31e1f5d
--- /dev/null
+++ b/Examples/test_cleanup.cmake
@@ -0,0 +1,7 @@
+# delete all test files except backtrace
+file(GLOB test_files ${CMAKE_ARGV3}/*)
+foreach(file ${test_files})
+    if(NOT ${file} MATCHES "Backtrace*")
+        execute_process(COMMAND ${CMAKE_COMMAND} -E rm -r ${file})
+    endif()
+endforeach()