Execution Chart

Sorry, for this execution, no execution chart could be reported.

Trace from the execution

Formatting '/data/fkordon/mcc2025-input.r175-smll-174889238800213.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 RefineWMG-PT-050050, examination is StableMarking
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r175-smll-174889238800213
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 532K
-rw-r--r-- 1 mcc users 7.4K May 29 14:47 CTLCardinality.txt
-rw-r--r-- 1 mcc users 78K May 29 14:47 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.6K May 29 14:47 CTLFireability.txt
-rw-r--r-- 1 mcc users 52K 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 3.6K May 29 14:47 LTLCardinality.txt
-rw-r--r-- 1 mcc users 28K May 29 14:47 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K May 29 14:47 LTLFireability.txt
-rw-r--r-- 1 mcc users 19K May 29 14:47 LTLFireability.xml
-rw-r--r-- 1 mcc users 10K May 29 14:47 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 105K May 29 14:47 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 7.3K 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 1.7K May 29 14:47 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K May 29 14:47 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 29 14:32 equiv_col
-rw-r--r-- 1 mcc users 7 May 29 14:32 instance
-rw-r--r-- 1 mcc users 6 May 29 14:32 iscolored
-rw-r--r-- 1 mcc users 110K 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

FORMULA_NAME StableMarking

=== Now, execution of the tool begins

BK_START 1748992105087

Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=StableMarking
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=1800
BK_INPUT=RefineWMG-PT-050050
BK_MEMORY_CONFINEMENT=16384
Not applying reductions.
Model is PT
StableMarking PT
Running Version 202505121319
[2025-06-03 23:08:27] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, StableMarking, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 1800]
[2025-06-03 23:08:27] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2025-06-03 23:08:27] [INFO ] Load time of PNML (sax parser for PT used): 140 ms
[2025-06-03 23:08:27] [INFO ] Transformed 254 places.
[2025-06-03 23:08:27] [INFO ] Transformed 203 transitions.
[2025-06-03 23:08:27] [INFO ] Parsed PT model containing 254 places and 203 transitions and 608 arcs in 316 ms.
Structural test allowed to assert that 100 places are NOT stable. Took 13 ms.
RANDOM walk for 40113 steps (8 resets) in 875 ms. (45 steps per ms) remains 144/154 properties
BEST_FIRST walk for 404 steps (4 resets) in 12 ms. (31 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 7 ms. (50 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 12 ms. (31 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 7 ms. (50 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 13 ms. (28 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 7 ms. (50 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 8 ms. (44 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 29 ms. (13 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 7 ms. (50 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 8 ms. (44 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 7 ms. (50 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 5 ms. (67 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 5 ms. (67 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 7 ms. (50 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 13 ms. (28 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 7 ms. (50 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 7 ms. (50 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 7 ms. (50 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 7 ms. (50 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 8 ms. (44 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 5 ms. (67 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 5 ms. (67 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 5 ms. (67 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 11 ms. (33 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 9 ms. (40 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 8 ms. (44 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 27 ms. (14 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 15 ms. (25 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 9 ms. (40 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 7 ms. (50 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 9 ms. (40 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 9 ms. (40 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 10 ms. (36 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 8 ms. (44 steps per ms) remains 144/144 properties
BEST_FIRST walk for 404 steps (4 resets) in 6 ms. (57 steps per ms) remains 144/144 properties
[2025-06-03 23:08:28] [INFO ] Flatten gal took : 175 ms
[2025-06-03 23:08:28] [INFO ] Flatten gal took : 54 ms
[2025-06-03 23:08:28] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality11750105774854417388.gal : 57 ms
[2025-06-03 23:08:28] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality13070829508169134732.prop : 3 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202505121319/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality11750105774854417388.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality13070829508169134732.prop' '--nowitness' '--gen-order' 'FOLLOW'

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202505121319/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...330
Loading property file /tmp/ReachabilityCardinality13070829508169134732.prop.
SDD proceeding with computation,144 properties remain. new max is 4
SDD size :1 after 5
SDD proceeding with computation,144 properties remain. new max is 8
SDD size :5 after 10
SDD proceeding with computation,144 properties remain. new max is 16
SDD size :10 after 19
SDD proceeding with computation,144 properties remain. new max is 32
SDD size :19 after 36
SDD proceeding with computation,144 properties remain. new max is 64
SDD size :36 after 918
SDD proceeding with computation,144 properties remain. new max is 128
SDD size :918 after 80631
SDD proceeding with computation,144 properties remain. new max is 256
SDD size :80631 after 1.3801e+09
SDD proceeding with computation,144 properties remain. new max is 512
SDD size :1.3801e+09 after 1.19042e+17
SDD proceeding with computation,144 properties remain. new max is 1024
SDD size :1.19042e+17 after 1.25039e+34
SDD proceeding with computation,144 properties remain. new max is 2048
SDD size :1.25039e+34 after 1.14192e+68
Interrupted probabilistic random walk after 62165 steps, run timeout after 3004 ms. (steps per millisecond=20 ) properties seen :0 out of 144
Probabilistic random walk after 62165 steps, saw 58943 distinct states, run finished after 3012 ms. (steps per millisecond=20 ) properties seen :0
// Phase 1: matrix 203 rows 254 cols
[2025-06-03 23:08:31] [INFO ] Computed 102 invariants in 12 ms
Starting Z3 with timeout 5.0 s and query timeout 500.0 ms
All remaining problems are real, not stopping.
At refinement iteration 0 (INCLUDED_ONLY) 0/144 variables, 48/48 constraints. Problems are: Problem set: 0 solved, 144 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/144 variables, 0/48 constraints. Problems are: Problem set: 0 solved, 144 unsolved
At refinement iteration 2 (OVERLAPS) 4/148 variables, 1/49 constraints. Problems are: Problem set: 0 solved, 144 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/148 variables, 0/49 constraints. Problems are: Problem set: 0 solved, 144 unsolved
At refinement iteration 4 (OVERLAPS) 100/248 variables, 148/197 constraints. Problems are: Problem set: 0 solved, 144 unsolved
At refinement iteration 5 (INCLUDED_ONLY) 0/248 variables, 0/197 constraints. Problems are: Problem set: 0 solved, 144 unsolved
SMT process timed out in 5149ms, After SMT, problems are : Problem set: 0 solved, 144 unsolved
Skipping Parikh replay, no witness traces provided.
Support contains 144 out of 254 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 254/254 places, 203/203 transitions.
Graph (trivial) has 102 edges and 254 vertex of which 100 / 254 are part of one of the 50 SCC in 4 ms
Free SCC test removed 50 places
Drop transitions (Empty/Sink Transition effects.) removed 100 transitions
Reduce isomorphic transitions removed 100 transitions.
Reduce places removed 50 places and 0 transitions.
Iterating post reduction 0 with 50 rules applied. Total rules applied 51 place count 154 transition count 103
Performed 2 Post agglomeration using F-continuation condition.Transition count delta: 2
Deduced a syphon composed of 2 places in 1 ms
Reduce places removed 4 places and 0 transitions.
Iterating global reduction 1 with 6 rules applied. Total rules applied 57 place count 150 transition count 101
Drop transitions (Trivial Post-Agglo cleanup.) removed 1 transitions
Trivial Post-agglo rules discarded 1 transitions
Performed 1 trivial Post agglomeration. Transition count delta: 1
Iterating post reduction 1 with 1 rules applied. Total rules applied 58 place count 150 transition count 100
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 2 with 1 rules applied. Total rules applied 59 place count 149 transition count 100
Performed 1 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 3 with 1 Pre rules applied. Total rules applied 59 place count 149 transition count 99
Deduced a syphon composed of 1 places in 0 ms
Reduce places removed 1 places and 0 transitions.
Iterating global reduction 3 with 2 rules applied. Total rules applied 61 place count 148 transition count 99
Applied a total of 61 rules in 79 ms. Remains 148 /254 variables (removed 106) and now considering 99/203 (removed 104) transitions.
Running 98 sub problems to find dead transitions.
// Phase 1: matrix 99 rows 148 cols
[2025-06-03 23:08:36] [INFO ] Computed 50 invariants in 3 ms
Starting Z3 with timeout 20.0 s and query timeout 2000.0 ms
At refinement iteration 0 (INCLUDED_ONLY) 0/146 variables, 48/48 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/146 variables, 0/48 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 2 (OVERLAPS) 2/148 variables, 2/50 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/148 variables, 0/50 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 4 (OVERLAPS) 99/247 variables, 148/198 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 5 (INCLUDED_ONLY) 0/247 variables, 0/198 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 6 (OVERLAPS) 0/247 variables, 0/198 constraints. Problems are: Problem set: 0 solved, 98 unsolved
No progress, stopping.
After SMT solving in domain Real declared 247/247 variables, and 198 constraints, problems are : Problem set: 0 solved, 98 unsolved in 6271 ms.
Refiners :[Positive P Invariants (semi-flows): 50/50 constraints, State Equation: 148/148 constraints, PredecessorRefiner: 98/98 constraints, Known Traps: 0/0 constraints, Known Traps Along Path: 0/0 constraints]
Escalating to Integer solving :Problem set: 0 solved, 98 unsolved
Starting Z3 with timeout 20.0 s and query timeout 2000.0 ms
At refinement iteration 0 (INCLUDED_ONLY) 0/146 variables, 48/48 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/146 variables, 0/48 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 2 (OVERLAPS) 2/148 variables, 2/50 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/148 variables, 0/50 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 4 (OVERLAPS) 99/247 variables, 148/198 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 5 (INCLUDED_ONLY) 0/247 variables, 98/296 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/247 variables, 0/296 constraints. Problems are: Problem set: 0 solved, 98 unsolved
At refinement iteration 7 (OVERLAPS) 0/247 variables, 0/296 constraints. Problems are: Problem set: 0 solved, 98 unsolved
No progress, stopping.
After SMT solving in domain Int declared 247/247 variables, and 296 constraints, problems are : Problem set: 0 solved, 98 unsolved in 6152 ms.
Refiners :[Positive P Invariants (semi-flows): 50/50 constraints, State Equation: 148/148 constraints, PredecessorRefiner: 98/98 constraints, Known Traps: 0/0 constraints, Known Traps Along Path: 0/0 constraints]
After SMT, in 12471ms problems are : Problem set: 0 solved, 98 unsolved
Search for dead transitions found 0 dead transitions in 12475ms
Finished structural reductions in REACHABILITY mode , in 1 iterations and 12576 ms. Remains : 148/254 places, 99/203 transitions.
RANDOM walk for 2653 steps (0 resets) in 51 ms. (51 steps per ms) remains 0/144 properties
ITS runner timed out or was interrupted.
ITS tools runner thread asked to quit. Dying gracefully.
Able to resolve query StableMarking after proving 155 properties.
FORMULA StableMarking FALSE TECHNIQUES RANDOM_WALK MARKED_SUFFIX_TEST TOPOLOGICAL
Total runtime 21823 ms.

BK_STOP 1748992128935

--------------------
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
+ [[ StableMarking = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution StableMarking -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 1800
+ 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 StableMarking -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 1800

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="RefineWMG-PT-050050"
export BK_EXAMINATION="StableMarking"
export BK_TOOL="itstools"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="1800"
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 RefineWMG-PT-050050, examination is StableMarking"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r175-smll-174889238800213"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/RefineWMG-PT-050050.tgz
mv RefineWMG-PT-050050 execution
cd execution
if [ "StableMarking" = "ReachabilityDeadlock" ] || [ "StableMarking" = "UpperBounds" ] || [ "StableMarking" = "QuasiLiveness" ] || [ "StableMarking" = "StableMarking" ] || [ "StableMarking" = "Liveness" ] || [ "StableMarking" = "OneSafe" ] || [ "StableMarking" = "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 [ "StableMarking" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "StableMarking" != "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 "StableMarking.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 '' StableMarking.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "StableMarking" = "ReachabilityDeadlock" ] || [ "StableMarking" = "QuasiLiveness" ] || [ "StableMarking" = "StableMarking" ] || [ "StableMarking" = "Liveness" ] || [ "StableMarking" = "OneSafe" ] ; then
echo "FORMULA_NAME StableMarking"
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 ;