run-vmtest: dump dmesg on sched_ext tests failure

Signed-off-by: Ihor Solodrai <isolodrai@meta.com>

run-vmtest/run-scx-selftests.sh

@@ -2,18 +2,35 @@
 
 set -euo pipefail
 
-source "$(cd "$(dirname "$0")" && pwd)/helpers.sh"
-
-foldable start selftests/sched_ext "Executing selftests/sched_ext/runner"
-
 SELFTESTS_DIR="${KERNEL_ROOT}/selftests/sched_ext"
 STATUS_FILE=/mnt/vmtest/exitstatus
 
 cd "${SELFTESTS_DIR}"
-./runner "$@" | tee runner.log
+
+echo "Executing selftests/sched_ext/runner"
+echo "runner output is being written to runner.log"
+
+./runner "$@" 2>&1 > runner.log & wait
+
+echo "runner finished, check results"
+echo "[...]"
+tail -n 16 runner.log
 
 failed=$(tail -n 16 runner.log | grep "FAILED" | awk '{print $2}')
 
-echo "selftests/sched_ext:$failed" >>"${STATUS_FILE}"
+if [ "$failed" -gt 0 ]; then
+    echo "Tests failed, dumping full runners log and dmesg"
+
+    echo "-------- runner.log start --------"
+    cat runner.log
+    echo "-------- runner.log end ----------"
+
+    echo "-------- dmesg start --------"
+    dmesg -H
+    echo "-------- dmesg end ----------"
+fi
+
+echo "selftests/sched_ext:$failed" >> "${STATUS_FILE}"
+
+exit 0
 
-foldable end selftests/sched_ext