[PATCH 11/11] tests: increase stalld initialization timeout to 240s

On PREEMPT_RT systems with large CPU counts (32+), BPF tracepoint
attachment triggers SRCU synchronization that can take well over
15 seconds, causing spurious test failures. Raise the
wait_for_stalld_ready timeout from 15s to 240s in
start_stalld_with_log and test_backend_selection.

This does not affect happy-path latency: the underlying grep -m1
returns as soon as "monitoring started" appears in the log.

Signed-off-by: Wander Lairson Costa <[email protected]>
---
 tests/functional/test_backend_selection.sh | 2 +-
 tests/helpers/test_helpers.sh              | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/tests/functional/test_backend_selection.sh b/tests/functional/test_backend_selection.sh
index 26654e1..e6924ff 100755
--- a/tests/functional/test_backend_selection.sh
+++ b/tests/functional/test_backend_selection.sh
@@ -38,7 +38,7 @@ test_backend_flag() {
 	STALLD_PID=$!
 	CLEANUP_PIDS+=("${STALLD_PID}")
 
-	if ! wait_for_stalld_ready "${log_file}" 15; then
+	if ! wait_for_stalld_ready "${log_file}" 240; then
 		fail "stalld failed to start (${description})"
 	fi
 
diff --git a/tests/helpers/test_helpers.sh b/tests/helpers/test_helpers.sh
index 9222d07..e06ff8b 100755
--- a/tests/helpers/test_helpers.sh
+++ b/tests/helpers/test_helpers.sh
@@ -1162,11 +1162,11 @@ start_stalld_with_log() {
 	STALLD_PID=$!
 	CLEANUP_PIDS+=("${STALLD_PID}")
 
-	if ! wait_for_stalld_ready "${log_file}" 15; then
+	if ! wait_for_stalld_ready "${log_file}" 240; then
 		log "Log contents:"
 		cat "${log_file}"
 		stop_stalld
-		fail "stalld did not initialize within 15s"
+		fail "stalld did not initialize within 240s"
 	fi
 
 	local end_ns=$(date +%s%N)
-- 
2.55.0