About the Execution of ITS-Tools for FamilyReunion-COL-L00800M0080C040P040G020
| Execution Summary | |||||
| Max Memory Used (MB) |
Time wait (ms) | CPU Usage (ms) | I/O Wait (ms) | Computed Result | Execution Status |
| 0.000 | 3600000.00 | 0.00 | 0.00 | T?F??????F?????? | normal |
Execution Chart
Sorry, for this execution, no execution chart could be reported.
Trace from the execution
Formatting '/data/fkordon/mcc2025-input.r086-smll-174860102000148.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2025-input.qcow2 backing_fmt=qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................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=====================================================================
Generated by BenchKit 2-5832
Executing tool itstools
Input is FamilyReunion-COL-L00800M0080C040P040G020, examination is LTLFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r086-smll-174860102000148
=====================================================================
--------------------
preparation of the directory to be used:
/home/mcc/execution
total 644K
-rw-r--r-- 1 mcc users 6.5K May 29 14:47 CTLCardinality.txt
-rw-r--r-- 1 mcc users 63K May 29 14:47 CTLCardinality.xml
-rw-r--r-- 1 mcc users 7.8K May 29 14:47 CTLFireability.txt
-rw-r--r-- 1 mcc users 57K May 29 14:47 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 29 14:32 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 7.0K May 29 14:32 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 4.0K May 29 14:47 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K May 29 14:47 LTLCardinality.xml
-rw-r--r-- 1 mcc users 3.3K May 29 14:47 LTLFireability.txt
-rw-r--r-- 1 mcc users 21K May 29 14:47 LTLFireability.xml
-rw-r--r-- 1 mcc users 13K May 29 14:47 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 131K May 29 14:47 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 9.8K May 29 14:47 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 60K May 29 14:47 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 2.0K May 29 14:47 UpperBounds.txt
-rw-r--r-- 1 mcc users 4.0K May 29 14:47 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 May 29 14:32 equiv_pt
-rw-r--r-- 1 mcc users 24 May 29 14:32 instance
-rw-r--r-- 1 mcc users 5 May 29 14:32 iscolored
-rw-r--r-- 1 mcc users 185K May 29 14:32 model.pnml
--------------------
content from stdout:
=== Data for post analysis generated by BenchKit (invocation template)
The expected result is a vector of booleans
BOOL_VECTOR
echo here is the order used to build the result vector(from xml file)
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-00
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-01
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-02
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-03
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-04
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-05
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-06
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-07
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-08
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-09
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-10
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-11
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-12
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-13
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-14
FORMULA_NAME FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-15
=== Now, execution of the tool begins
BK_START 1748737262137
Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=LTLFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=FamilyReunion-COL-L00800M0080C040P040G020
BK_MEMORY_CONFINEMENT=16384
Not applying reductions.
Model is COL
LTLFireability COL
Running Version 202505121319
[2025-06-01 00:21:04] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, LTLFireability, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2025-06-01 00:21:04] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2025-06-01 00:21:04] [INFO ] Detected file is not PT type :http://www.pnml.org/version-2009/grammar/symmetricnet
log4j:WARN No appenders could be found for logger (org.apache.axiom.locator.DefaultOMMetaFactoryLocator).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
[2025-06-01 00:21:05] [WARNING] Using fallBack plugin, rng conformance not checked
[2025-06-01 00:21:05] [INFO ] Load time of PNML (colored model parsed with PNMLFW) : 1119 ms
[2025-06-01 00:21:05] [INFO ] Detected 5 constant HL places corresponding to 206 PT places.
[2025-06-01 00:21:05] [INFO ] Imported 104 HL places and 66 HL transitions for a total of 2076109 PT places and 1977710.0 transition bindings in 108 ms.
Parsed 16 properties from file /home/mcc/execution/LTLFireability.xml in 16 ms.
Working with output stream class java.io.PrintStream
[2025-06-01 00:21:05] [INFO ] Built PT skeleton of HLPN with 104 places and 66 transitions 198 arcs in 16 ms.
[2025-06-01 00:21:05] [INFO ] Skeletonized 16 HLPN properties in 2 ms.
Initial state reduction rules removed 3 formulas.
FORMULA FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-00 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-02 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA FamilyReunion-COL-L00800M0080C040P040G020-LTLFireability-09 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Computed a total of 104 stabilizing places and 66 stable transitions
Complete graph has no SCC; deadlocks are unavoidable. place count 104 transition count 66
Detected that all paths lead to deadlock. Applying this knowledge to assert that all AP eventually converge (and all enablings converge to false).
Remains 13 properties that can be checked using skeleton over-approximation.
Reduce places removed 5 places and 0 transitions.
Computed a total of 99 stabilizing places and 66 stable transitions
Complete graph has no SCC; deadlocks are unavoidable. place count 99 transition count 66
Detected that all paths lead to deadlock. Applying this knowledge to assert that all AP eventually converge (and all enablings converge to false).
RANDOM walk for 41712 steps (8 resets) in 243 ms. (170 steps per ms) remains 20/24 properties
BEST_FIRST walk for 4004 steps (8 resets) in 141 ms. (28 steps per ms) remains 14/20 properties
BEST_FIRST walk for 4003 steps (8 resets) in 72 ms. (54 steps per ms) remains 11/14 properties
BEST_FIRST walk for 4004 steps (8 resets) in 31 ms. (125 steps per ms) remains 11/11 properties
BEST_FIRST walk for 4002 steps (8 resets) in 56 ms. (70 steps per ms) remains 11/11 properties
BEST_FIRST walk for 4003 steps (8 resets) in 33 ms. (117 steps per ms) remains 11/11 properties
BEST_FIRST walk for 4004 steps (8 resets) in 39 ms. (100 steps per ms) remains 11/11 properties
BEST_FIRST walk for 4004 steps (8 resets) in 31 ms. (125 steps per ms) remains 11/11 properties
BEST_FIRST walk for 4002 steps (8 resets) in 24 ms. (160 steps per ms) remains 11/11 properties
BEST_FIRST walk for 4004 steps (8 resets) in 34 ms. (114 steps per ms) remains 11/11 properties
BEST_FIRST walk for 4004 steps (8 resets) in 29 ms. (133 steps per ms) remains 11/11 properties
BEST_FIRST walk for 4004 steps (8 resets) in 39 ms. (100 steps per ms) remains 11/11 properties
BEST_FIRST walk for 4002 steps (8 resets) in 29 ms. (133 steps per ms) remains 11/11 properties
BEST_FIRST walk for 4004 steps (8 resets) in 81 ms. (48 steps per ms) remains 11/11 properties
// Phase 1: matrix 66 rows 99 cols
[2025-06-01 00:21:06] [INFO ] Computed 33 invariants in 12 ms
Starting Z3 with timeout 5.0 s and query timeout 500.0 ms
At refinement iteration 0 (INCLUDED_ONLY) 0/14 variables, 0/0 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 1 (OVERLAPS) 31/45 variables, 3/3 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 2 (INCLUDED_ONLY) 0/45 variables, 1/4 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/45 variables, 0/4 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 4 (OVERLAPS) 10/55 variables, 1/5 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 5 (INCLUDED_ONLY) 0/55 variables, 0/5 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 6 (OVERLAPS) 37/92 variables, 24/29 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/92 variables, 0/29 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 8 (OVERLAPS) 7/99 variables, 4/33 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 9 (INCLUDED_ONLY) 0/99 variables, 0/33 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 10 (OVERLAPS) 66/165 variables, 99/132 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 11 (INCLUDED_ONLY) 0/165 variables, 0/132 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 12 (OVERLAPS) 0/165 variables, 0/132 constraints. Problems are: Problem set: 0 solved, 11 unsolved
No progress, stopping.
After SMT solving in domain Real declared 165/165 variables, and 132 constraints, problems are : Problem set: 0 solved, 11 unsolved in 1470 ms.
Refiners :[Positive P Invariants (semi-flows): 4/4 constraints, Generalized P Invariants (flows): 29/29 constraints, State Equation: 99/99 constraints, PredecessorRefiner: 11/11 constraints, Known Traps: 0/0 constraints, Known Traps Along Path: 0/0 constraints]
Escalating to Integer solving :Problem set: 0 solved, 11 unsolved
Starting Z3 with timeout 5.0 s and query timeout 500.0 ms
At refinement iteration 0 (INCLUDED_ONLY) 0/14 variables, 0/0 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 1 (OVERLAPS) 31/45 variables, 3/3 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 2 (INCLUDED_ONLY) 0/45 variables, 1/4 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/45 variables, 0/4 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 4 (OVERLAPS) 10/55 variables, 1/5 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 5 (INCLUDED_ONLY) 0/55 variables, 0/5 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 6 (OVERLAPS) 37/92 variables, 24/29 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/92 variables, 0/29 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 8 (OVERLAPS) 7/99 variables, 4/33 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 9 (INCLUDED_ONLY) 0/99 variables, 0/33 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 10 (OVERLAPS) 66/165 variables, 99/132 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 11 (INCLUDED_ONLY) 0/165 variables, 11/143 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 12 (INCLUDED_ONLY) 0/165 variables, 0/143 constraints. Problems are: Problem set: 0 solved, 11 unsolved
At refinement iteration 13 (OVERLAPS) 0/165 variables, 0/143 constraints. Problems are: Problem set: 0 solved, 11 unsolved
No progress, stopping.
After SMT solving in domain Int declared 165/165 variables, and 143 constraints, problems are : Problem set: 0 solved, 11 unsolved in 816 ms.
Refiners :[Positive P Invariants (semi-flows): 4/4 constraints, Generalized P Invariants (flows): 29/29 constraints, State Equation: 99/99 constraints, PredecessorRefiner: 11/11 constraints, Known Traps: 0/0 constraints, Known Traps Along Path: 0/0 constraints]
After SMT, in 2341ms problems are : Problem set: 0 solved, 11 unsolved
Fused 11 Parikh solutions to 2 different solutions.
Finished Parikh walk after 430 steps, including 0 resets, run visited all 11 properties in 23 ms. (steps per millisecond=18 )
Finished Parikh walk after 0 steps, including 0 resets, run visited all 0 properties in 1 ms. (steps per millisecond=0 )
Parikh walk visited 11 properties in 30 ms.
[2025-06-01 00:21:09] [INFO ] Flatten gal took : 42 ms
[2025-06-01 00:21:09] [INFO ] Flatten gal took : 13 ms
Transition Gate2ANDJoin forces synchronizations/join behavior on parameter l of sort LegalResident
Transition ReceiveLangChoice forces synchronizations/join behavior on parameter m of sort MICSystem
Symmetric sort wr.t. initial and guards and successors and join/free detected :CINFORMI
Symmetric sort wr.t. initial detected :CINFORMI
Symmetric sort wr.t. initial and guards detected :CINFORMI
Applying symmetric unfolding of full symmetric sort :CINFORMI domain size was 41
Transition Gate1ANDJoin forces synchronizations/join behavior on parameter p of sort PublicAdminOffice
Symmetric sort wr.t. initial and guards and successors and join/free detected :GovernmentCommission
Symmetric sort wr.t. initial detected :GovernmentCommission
Symmetric sort wr.t. initial and guards detected :GovernmentCommission
Applying symmetric unfolding of full symmetric sort :GovernmentCommission domain size was 21
Symmetric sort wr.t. initial and guards and successors and join/free detected :Response
Symmetric sort wr.t. initial detected :Response
Transition SendClearanceToRel : guard parameter $r(Response:2) in guard (EQ $r 0)introduces in Response(2) partition with 2 elements
[2025-06-01 00:21:14] [INFO ] Unfolded HLPN to a Petri net with 1835549 places and 1592429 transitions 4577797 arcs in 5526 ms.
[2025-06-01 00:21:14] [INFO ] Unfolded 13 HLPN properties in 150 ms.
[2025-06-01 00:21:15] [INFO ] Reduced 64080 identical enabling conditions.
[2025-06-01 00:21:15] [INFO ] Reduced 64080 identical enabling conditions.
[2025-06-01 00:21:15] [INFO ] Reduced 64080 identical enabling conditions.
[2025-06-01 00:21:15] [INFO ] Reduced 64080 identical enabling conditions.
Deduced a syphon composed of 801 places in 6464 ms
Reduce places removed 927 places and 0 transitions.
Support contains 988435 out of 1834622 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 1834622/1834622 places, 1592429/1592429 transitions.
Reduce places removed 2569 places and 0 transitions.
Discarding 131364 places :
Implicit places reduction removed 131364 places
Iterating post reduction 0 with 133933 rules applied. Total rules applied 133933 place count 1700689 transition count 1592429
Applied a total of 133933 rules in 1955431 ms. Remains 1700689 /1834622 variables (removed 133933) and now considering 1592429/1592429 (removed 0) transitions.
// Phase 1: matrix 1592429 rows 1700689 cols
[2025-06-01 00:56:23] [WARNING] Invariant computation timed out after 120 seconds.
Starting Z3 with timeout 160.0 s and query timeout 16000.0 ms
[2025-06-01 00:59:03] [INFO ] Implicit Places with SMT raised an exceptionSMT solver raised an error when submitting script. Raised (error "Error writing to Z3 solver: java.io.IOException: Broken pipe")... after 281885 ms
Implicit Place search using SMT only with invariants took 281895 ms to find 0 implicit places.
Running 1591628 sub problems to find dead transitions.
// Phase 1: matrix 1592429 rows 1700689 cols
[2025-06-01 01:04:06] [WARNING] Invariant computation timed out after 120 seconds.
BK_TIME_CONFINEMENT_REACHED
--------------------
content from stderr:
+ export BINDIR=/home/mcc/BenchKit/bin//../itstools/bin//../
+ BINDIR=/home/mcc/BenchKit/bin//../itstools/bin//../
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ LTLFireability = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution LTLFireability -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600
+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202505121319.jar
+ VERSION=202505121319
+ echo 'Running Version 202505121319'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination LTLFireability -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600
Sequence of Actions to be Executed by the VM
This is useful if one wants to reexecute the tool in the VM from the submitted image disk.
set -x
# this is for BenchKit: configuration of major elements for the test
export BK_INPUT="FamilyReunion-COL-L00800M0080C040P040G020"
export BK_EXAMINATION="LTLFireability"
export BK_TOOL="itstools"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="3600"
export BK_MEMORY_CONFINEMENT="16384"
export BK_BIN_PATH="/home/mcc/BenchKit/bin/"
# this is specific to your benchmark or test
export BIN_DIR="$HOME/BenchKit/bin"
# remove the execution directoty if it exists (to avoid increse of .vmdk images)
if [ -d execution ] ; then
rm -rf execution
fi
# this is for BenchKit: explicit launching of the test
echo "====================================================================="
echo " Generated by BenchKit 2-5832"
echo " Executing tool itstools"
echo " Input is FamilyReunion-COL-L00800M0080C040P040G020, examination is LTLFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r086-smll-174860102000148"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"
tar xzf /home/mcc/BenchKit/INPUTS/FamilyReunion-COL-L00800M0080C040P040G020.tgz
mv FamilyReunion-COL-L00800M0080C040P040G020 execution
cd execution
if [ "LTLFireability" = "ReachabilityDeadlock" ] || [ "LTLFireability" = "UpperBounds" ] || [ "LTLFireability" = "QuasiLiveness" ] || [ "LTLFireability" = "StableMarking" ] || [ "LTLFireability" = "Liveness" ] || [ "LTLFireability" = "OneSafe" ] || [ "LTLFireability" = "StateSpace" ]; then
rm -f GenericPropertiesVerdict.xml
fi
pwd
ls -lh
echo
echo "--------------------"
echo "content from stdout:"
echo
echo "=== Data for post analysis generated by BenchKit (invocation template)"
echo
if [ "LTLFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "LTLFireability" != "StateSpace" ] ; then
echo "The expected result is a vector of booleans"
echo BOOL_VECTOR
else
echo "no data necessary for post analysis"
fi
echo
if [ -f "LTLFireability.xml" ] ; then # for cunf (txt files deleted;-)
echo echo "here is the order used to build the result vector(from xml file)"
for x in $(grep '
echo "FORMULA_NAME $x"
done
elif [ "LTLFireability" = "ReachabilityDeadlock" ] || [ "LTLFireability" = "QuasiLiveness" ] || [ "LTLFireability" = "StableMarking" ] || [ "LTLFireability" = "Liveness" ] || [ "LTLFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME LTLFireability"
fi
echo
echo "=== Now, execution of the tool begins"
echo
echo -n "BK_START "
date -u +%s%3N
echo
timeout -s 9 $BK_TIME_CONFINEMENT bash -c "/home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n \"BK_STOP \" ; date -u +%s%3N"
if [ $? -eq 137 ] ; then
echo
echo "BK_TIME_CONFINEMENT_REACHED"
fi
echo
echo "--------------------"
echo "content from stderr:"
echo
cat STDERR ;