From b3b5de19dfefc0ee741c8fab6d3d7fdb9de3781c Mon Sep 17 00:00:00 2001 From: Kienan Stewart Date: Tue, 28 May 2024 10:33:07 -0400 Subject: [PATCH] tests: Add test for missing short lived applications MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Change-Id: I691b9fb2cfae7603e40ca4c668acaff752ba3f28 Signed-off-by: Kienan Stewart Signed-off-by: Jérémie Galarneau --- tests/regression/Makefile.am | 1 + tests/regression/tools/live/Makefile.am | 5 +- .../tools/live/test_miss_short_lived_app.py | 96 +++++++++++++++++++ 3 files changed, 101 insertions(+), 1 deletion(-) create mode 100755 tests/regression/tools/live/test_miss_short_lived_app.py diff --git a/tests/regression/Makefile.am b/tests/regression/Makefile.am index 1b790b706..5a8eebd9b 100644 --- a/tests/regression/Makefile.am +++ b/tests/regression/Makefile.am @@ -16,6 +16,7 @@ TESTS = tools/base-path/test_ust \ tools/health/test_thread_ok \ tools/live/test_kernel \ tools/live/test_lttng_kernel \ + tools/live/test_miss_short_lived_app.py \ tools/live/test_per_application_leaks.py \ tools/live/test_ust \ tools/live/test_ust_tracefile_count \ diff --git a/tests/regression/tools/live/Makefile.am b/tests/regression/tools/live/Makefile.am index 3ad9b7ba3..a8042f67d 100644 --- a/tests/regression/tools/live/Makefile.am +++ b/tests/regression/tools/live/Makefile.am @@ -9,7 +9,10 @@ noinst_PROGRAMS = live_test EXTRA_DIST = test_kernel test_lttng_kernel test_per_application_leaks.py if HAVE_LIBLTTNG_UST_CTL -EXTRA_DIST += test_ust test_ust_tracefile_count test_lttng_ust +EXTRA_DIST += test_lttng_ust \ + test_miss_short_lived_app.py \ + test_ust \ + test_ust_tracefile_count endif live_test_SOURCES = live_test.cpp diff --git a/tests/regression/tools/live/test_miss_short_lived_app.py b/tests/regression/tools/live/test_miss_short_lived_app.py new file mode 100755 index 000000000..a77bef9f8 --- /dev/null +++ b/tests/regression/tools/live/test_miss_short_lived_app.py @@ -0,0 +1,96 @@ +#!/usr/bin/env python3 +# +# SPDX-FileCopyrightText: 2024 Kienan Stewart +# SPDX-LicenseIdentifier: LGPL-2.1-only +# +""" +Test that an attached live viewer doesn't miss streams created for a short lived +application which ends before the live viewer sees the new streams. + +This test tries to mimic the race between destruction and a live viewer's +GET_NEW_METADATA + GET_NEW_STREAMS commands by immediately destroying the session +after the traced application terminates. + +This is more likely with per-PID buffer allocation, but the underlying mechanism +also affects per-UID buffers if a new user is created and a short lived application +run quickly. + +When the relayd/live connection isn't working properly, this test will fail only +occasionally as the underlying mechanism is timing dependant. When working properly, +the test should always pass when run in a loop. +""" + +import os +import pathlib +import subprocess +import sys + +test_utils_import_path = pathlib.Path(__file__).absolute().parents[3] / "utils" +sys.path.append(str(test_utils_import_path)) +import lttngtest + + +def test_short_lived_ust_app(tap, test_env, buffer_sharing_policy): + tap.diagnostic( + "test_short_lived_ust_app with buffer sharing policy `{}`".format( + buffer_sharing_policy + ) + ) + + uid = None + user = None + if buffer_sharing_policy == lttngtest.lttngctl.BufferSharingPolicy.PerUID: + if not (os.getuid() == 0 and test_env.allows_destructive()): + tap.skip( + "Need to run PerUID test as root with `LTTNG_ENABLE_DESTRUCTIVE_TESTS` properly set to create a dummy user", + 1, + ) + return + (uid, user) = test_env.create_dummy_user() + client = lttngtest.LTTngClient(test_env, log=tap.diagnostic) + output = lttngtest.NetworkSessionOutputLocation( + "net://localhost:{}:{}/".format( + test_env.lttng_relayd_control_port, test_env.lttng_relayd_data_port + ) + ) + session = client.create_session(output=output, live=True) + channel = session.add_channel( + lttngtest.lttngctl.TracingDomain.User, + buffer_sharing_policy=buffer_sharing_policy, + ) + channel.add_recording_rule(lttngtest.lttngctl.UserTracepointEventRule("tp:tptest")) + session.start() + + # Connect live viewer + viewer = test_env.launch_live_viewer(session.name) + viewer.wait_until_connected() + + late_app = test_env.launch_wait_trace_test_application( + 10, wait_before_exit=False, run_as=user + ) + late_app.trace() + late_app.wait_for_tracing_done() + late_app.wait_for_exit() + + session.stop() + session.destroy() + viewer.wait() + + tap.test( + len(viewer.messages) == 10, + "Live viewer got {} / 10 expected events add exited gracefully".format( + len(viewer.messages) + ), + ) + + +tap = lttngtest.TapGenerator(2) +for buffer_sharing_policy in [ + lttngtest.lttngctl.BufferSharingPolicy.PerUID, + lttngtest.lttngctl.BufferSharingPolicy.PerPID, +]: + with lttngtest.test_environment( + log=tap.diagnostic, with_relayd=True, with_sessiond=True + ) as test_env: + test_short_lived_ust_app(tap, test_env, buffer_sharing_policy) +sys.exit(0 if tap.is_successful else 1) -- 2.39.5