tc_tcp_conn nondeterministically fails on Zephyr master v1.12.0-113-g280072961

[pfalcon]

Just starting to play with tcp_suite, following README (repo rev 1382ea4). Running with the Zephyr repo of rev in subj, out of 3 runs, I got 2 failures in the tc_tcp_conn testcase:

$ ttcn3_start test_suite tcp_suite.cfg
ttcn3_start: Starting the test suite
spawn /home/pfalcon/titan/bin/mctr_cli tcp_suite.cfg

*************************************************************************
* TTCN-3 Test Executor - Main Controller 2                              *
* Version: CRL 113 200/6 R3A                                            *
* Copyright (c) 2000-2017 Ericsson Telecom AB                           *
* All rights reserved. This program and the accompanying materials      *
* are made available under the terms of the Eclipse Public License v1.0 *
* which accompanies this distribution, and is available at              *
* http://www.eclipse.org/legal/epl-v10.html                             *
*************************************************************************

Using configuration file: tcp_suite.cfg
MC@x230: Unix server socket created successfully.
MC@x230: Listening on TCP port 36599.
x230 is the default
MC2> spawn ./test_suite x230 36599
TTCN-3 Host Controller (parallel mode), version CRL 113 200/6 R3A
MC@x230: New HC connected from localhost [127.0.0.1]. x230: Linux 4.13.0-25-generic on x86_64.
cmtc
MC@x230: Downloading configuration file to all HCs.
MC@x230: Configuration file was processed on all HCs.
MC@x230: Creating MTC on host localhost.
MC@x230: MTC is created.
MC2> smtc
Executing all items of [EXECUTE] section.
MC2> MTC@x230: Execution of control part in module tcp_suite started.
MTC@x230: Test case tc_tcp_001 started.
MTC@x230: Test case tc_tcp_001 finished. Verdict: pass
MTC@x230: Test case tc_tcp_002 started.
MTC@x230: Test case tc_tcp_002 finished. Verdict: pass
MTC@x230: Test case tc_tcp_003 started.
MTC@x230: Test case tc_tcp_003 finished. Verdict: pass
MTC@x230: Test case tc_tcp_003 started.
MTC@x230: Test case tc_tcp_003 finished. Verdict: pass
MTC@x230: Test case tc_tcp_004 started.
MTC@x230: Test case tc_tcp_004 finished. Verdict: pass
MTC@x230: Test case tc_tcp_005 started.
MTC@x230: Test case tc_tcp_005 finished. Verdict: pass
MTC@x230: Test case tc_tcp_006 started.
MTC@x230: Test case tc_tcp_006 finished. Verdict: pass
MTC@x230: Test case tc_tcp_007 started.
MTC@x230: Test case tc_tcp_007 finished. Verdict: pass
MTC@x230: Test case tc_tcp_008 started.
MTC@x230: Test case tc_tcp_008 finished. Verdict: pass
MTC@x230: Test case tc_tcp_009 started.
MTC@x230: Test case tc_tcp_009 finished. Verdict: pass
MTC@x230: Test case tc_tcp_010 started.
MTC@x230: Test case tc_tcp_010 finished. Verdict: pass
MTC@x230: Test case tc_tcp_011 started.
MTC@x230: Test case tc_tcp_011 finished. Verdict: pass
MTC@x230: Test case tc_tcp_012 started.
MTC@x230: Test case tc_tcp_012 finished. Verdict: pass
MTC@x230: Test case tc_tcp_013 started.
MTC@x230: Test case tc_tcp_013 finished. Verdict: pass
MTC@x230: Test case tc_tcp_conn started.
MTC@x230: Test case tc_tcp_conn finished. Verdict: fail
MTC@x230: Execution of control part in module tcp_suite finished.
MC@x230: Test execution finished.
Execution of [EXECUTE] section finished.
emtc
MC@x230: Terminating MTC.
MTC@x230: Verdict statistics: 0 none (0.00 %), 14 pass (93.33 %), 0 inconc (0.00 %), 1 fail (6.67 %), 0 error (0.00 %).
MTC@x230: Test execution summary: 15 test cases were executed. Overall verdict: fail
MC@x230: MTC terminated.
MC2> exit
MC@x230: Shutting down session.
MC@x230: Shutdown complete.