poky/meta/recipes-kernel/lttng/lttng-tools/0001-tests-wait-some-more-before-analysing-traces-or-star.patch

From 8d9daede0882d239b0a47b0f7a6db68ba4934a7d Mon Sep 17 00:00:00 2001
From: Alexander Kanavin <alex@linutronix.de>
Date: Sat, 4 Sep 2021 13:57:39 +0200
Subject: [PATCH] tests: wait some more before analysing traces or starting
 tracing

Otherwise, there are sporadic race failures where lttng tracing
is stopped before all expected events are collected or is started too soon, e.g.:

PASS: tools/tracker/test_event_tracker 205 - Traced application stopped.
PASS: tools/tracker/test_event_tracker 206 - Stop lttng tracing for session
PASS: tools/tracker/test_event_tracker 207 - Destroy session tracker
FAIL: tools/tracker/test_event_tracker 208 - Validate empty trace

PASS: ust/namespaces/test_ns_contexts_change 42 - Stop lttng tracing for session mnt_ns
PASS: ust/namespaces/test_ns_contexts_change 43 - Destroy session mnt_ns
PASS: ust/namespaces/test_ns_contexts_change 44 - Wait after kill session daemon
PASS: ust/namespaces/test_ns_contexts_change 45 - Validate trace for event mnt_ns = 4026531840, 1000 events
PASS: ust/namespaces/test_ns_contexts_change 46 - Read a total of 1000 events, expected 1000
PASS: ust/namespaces/test_ns_contexts_change 47 - Validate trace for event mnt_ns = 4026532303, 233 events
FAIL: ust/namespaces/test_ns_contexts_change 48 - Read a total of 233 events, expected 1000

This is a hack; issue should be fixed upstream with explicit syncs.
It has been reported here: https://bugs.lttng.org/issues/1217

Upstream-Status: Inappropriate [needs a real fix]
Signed-off-by: Alexander Kanavin <alex@linutronix.de>
---
 tests/regression/tools/tracker/test_event_tracker       | 8 ++++++++
 tests/regression/ust/namespaces/test_ns_contexts_change | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/tests/regression/tools/tracker/test_event_tracker b/tests/regression/tools/tracker/test_event_tracker
index feb3787..a0f2257 100755
--- a/tests/regression/tools/tracker/test_event_tracker
+++ b/tests/regression/tools/tracker/test_event_tracker
@@ -130,6 +130,8 @@ function test_event_vpid_tracker()
 
 	prepare_"$domain"_app
 
+sleep 5
+
 	start_lttng_tracing_ok
 
 	if [ "$expect_event" -eq 1 ]; then
@@ -173,6 +175,8 @@ function test_event_pid_tracker()
 
 	prepare_"$domain"_app
 
+sleep 5
+
 	start_lttng_tracing_ok
 
 	if [ "$expect_event" -eq 1 ]; then
@@ -275,6 +279,8 @@ function test_event_vpid_track_untrack()
 
 	prepare_"$domain"_app
 
+sleep 5
+
 	start_lttng_tracing_ok
 
 	lttng_track_"$domain"_ok "--vpid ${CHILD_PID}"
@@ -315,6 +321,8 @@ function test_event_pid_track_untrack()
 
 	prepare_"$domain"_app
 
+sleep 5
+
 	start_lttng_tracing_ok
 
 	lttng_track_"$domain"_ok "--pid ${CHILD_PID}"
diff --git a/tests/regression/ust/namespaces/test_ns_contexts_change b/tests/regression/ust/namespaces/test_ns_contexts_change
index c0af15e..b111bfe 100755
--- a/tests/regression/ust/namespaces/test_ns_contexts_change
+++ b/tests/regression/ust/namespaces/test_ns_contexts_change
@@ -79,6 +79,8 @@ function test_ns()
 
 	touch "$file_sync_before_last"
 
+sleep 5
+
 	# stop and destroy
 	stop_lttng_tracing_ok "$session_name"
 	destroy_lttng_session_ok "$session_name"
-- 
2.20.1