Execution Chart

We display below the execution chart for this examination (boot time has been removed).

Trace from the execution

Formatting '/data/fkordon/mcc2022-input.r269-tall-165303553600326.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2022-input.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 2-4028
Executing tool gold2021
Input is TwoPhaseLocking-PT-nC05000vN, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r269-tall-165303553600326
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 460K
-rw-r--r-- 1 mcc users 7.3K Apr 30 10:42 CTLCardinality.txt
-rw-r--r-- 1 mcc users 73K Apr 30 10:42 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.3K Apr 30 10:41 CTLFireability.txt
-rw-r--r-- 1 mcc users 59K Apr 30 10:41 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.7K May 9 09:19 LTLCardinality.txt
-rw-r--r-- 1 mcc users 24K May 9 09:19 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.4K May 9 09:19 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K May 9 09:19 LTLFireability.xml
-rw-r--r-- 1 mcc users 13K Apr 30 10:43 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 128K Apr 30 10:43 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.5K Apr 30 10:42 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 72K Apr 30 10:42 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.8K May 9 09:19 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.9K May 9 09:19 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 10 09:34 equiv_col
-rw-r--r-- 1 mcc users 10 May 10 09:34 instance
-rw-r--r-- 1 mcc users 6 May 10 09:34 iscolored
-rw-r--r-- 1 mcc users 4.6K May 10 09:34 model.pnml

--------------------
content from stdout:

=== Data for post analysis generated by BenchKit (invocation template)

The expected result is a vector of booleans
BOOL_VECTOR

here is the order used to build the result vector(from text file)
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-00
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-01
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-02
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-03
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-04
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-05
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-06
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-07
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-08
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-09
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-10
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-11
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-12
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-13
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-14
FORMULA_NAME TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-15

=== Now, execution of the tool begins

BK_START 1655073852484

Running Version 0
[2022-06-12 22:44:14] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -spotpath, /home/mcc/BenchKit/bin//..//ltlfilt, -z3path, /home/mcc/BenchKit/bin//..//z3/bin/z3, -yices2path, /home/mcc/BenchKit/bin//..//yices/bin/yices, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2022-06-12 22:44:14] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2022-06-12 22:44:14] [INFO ] Load time of PNML (sax parser for PT used): 20 ms
[2022-06-12 22:44:14] [INFO ] Transformed 8 places.
[2022-06-12 22:44:14] [INFO ] Transformed 6 transitions.
[2022-06-12 22:44:14] [INFO ] Parsed PT model containing 8 places and 6 transitions in 59 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 17 ms.
Working with output stream class java.io.PrintStream
Incomplete random walk after 10006 steps, including 2 resets, run finished after 10 ms. (steps per millisecond=1000 ) properties (out of 16) seen :2
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-13 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-03 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 43 ms. (steps per millisecond=232 ) properties (out of 14) seen :1
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-05 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 25 ms. (steps per millisecond=400 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 19 ms. (steps per millisecond=526 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 46 ms. (steps per millisecond=217 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 26 ms. (steps per millisecond=384 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 10000 steps, including 2 resets, run finished after 14 ms. (steps per millisecond=714 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 10000 steps, including 2 resets, run finished after 38 ms. (steps per millisecond=263 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 24 ms. (steps per millisecond=416 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=1111 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 63 ms. (steps per millisecond=158 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 17 ms. (steps per millisecond=588 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=1250 ) properties (out of 13) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 13 ms. (steps per millisecond=769 ) properties (out of 13) seen :0
Running SMT prover for 13 properties.
// Phase 1: matrix 6 rows 8 cols
[2022-06-12 22:44:14] [INFO ] Computed 3 place invariants in 5 ms
[2022-06-12 22:44:14] [INFO ] [Real]Absence check using 3 positive place invariants in 4 ms returned sat
[2022-06-12 22:44:14] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2022-06-12 22:44:14] [INFO ] [Real]Absence check using state equation in 17 ms returned sat
[2022-06-12 22:44:14] [INFO ] Computed and/alt/rep : 5/5/5 causal constraints (skipped 0 transitions) in 3 ms.
[2022-06-12 22:44:14] [INFO ] Added : 3 causal constraints over 1 iterations in 16 ms. Result :sat
Attempting to minimize the solution found.
Minimization took 4 ms.
[2022-06-12 22:44:14] [INFO ] [Real]Absence check using 3 positive place invariants in 2 ms returned unsat
[2022-06-12 22:44:14] [INFO ] [Real]Absence check using 3 positive place invariants in 1 ms returned sat
[2022-06-12 22:44:14] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2022-06-12 22:44:14] [INFO ] [Real]Absence check using state equation in 5 ms returned sat
[2022-06-12 22:44:14] [INFO ] Solution in real domain found non-integer solution.
[2022-06-12 22:44:15] [INFO ] [Nat]Absence check using 3 positive place invariants in 2 ms returned sat
[2022-06-12 22:44:15] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2022-06-12 22:44:15] [INFO ] [Nat]Absence check using state equation in 11 ms returned sat
[2022-06-12 22:44:15] [INFO ] Computed and/alt/rep : 5/5/5 causal constraints (skipped 0 transitions) in 1 ms.
[2022-06-12 22:44:15] [INFO ] Added : 2 causal constraints over 1 iterations in 16 ms. Result :sat
Attempting to minimize the solution found.
Minimization took 1 ms.
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using 3 positive place invariants in 1 ms returned unsat
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using 3 positive place invariants in 1 ms returned unsat
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using 3 positive place invariants in 1 ms returned sat
[2022-06-12 22:44:15] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using state equation in 4 ms returned sat
[2022-06-12 22:44:15] [INFO ] Solution in real domain found non-integer solution.
[2022-06-12 22:44:15] [INFO ] [Nat]Absence check using 3 positive place invariants in 0 ms returned sat
[2022-06-12 22:44:15] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2022-06-12 22:44:15] [INFO ] [Nat]Absence check using state equation in 3 ms returned sat
[2022-06-12 22:44:15] [INFO ] Computed and/alt/rep : 5/5/5 causal constraints (skipped 0 transitions) in 1 ms.
[2022-06-12 22:44:15] [INFO ] Added : 2 causal constraints over 1 iterations in 11 ms. Result :sat
Attempting to minimize the solution found.
Minimization took 0 ms.
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using 3 positive place invariants in 1 ms returned sat
[2022-06-12 22:44:15] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using state equation in 3 ms returned sat
[2022-06-12 22:44:15] [INFO ] Solution in real domain found non-integer solution.
[2022-06-12 22:44:15] [INFO ] [Nat]Absence check using 3 positive place invariants in 2 ms returned sat
[2022-06-12 22:44:15] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2022-06-12 22:44:15] [INFO ] [Nat]Absence check using state equation in 4 ms returned sat
[2022-06-12 22:44:15] [INFO ] Computed and/alt/rep : 5/5/5 causal constraints (skipped 0 transitions) in 0 ms.
[2022-06-12 22:44:15] [INFO ] Added : 4 causal constraints over 1 iterations in 5 ms. Result :sat
Attempting to minimize the solution found.
Minimization took 1 ms.
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using 3 positive place invariants in 12 ms returned sat
[2022-06-12 22:44:15] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using state equation in 4 ms returned sat
[2022-06-12 22:44:15] [INFO ] Computed and/alt/rep : 5/5/5 causal constraints (skipped 0 transitions) in 1 ms.
[2022-06-12 22:44:15] [INFO ] Added : 2 causal constraints over 1 iterations in 6 ms. Result :sat
Attempting to minimize the solution found.
Minimization took 1 ms.
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using 3 positive place invariants in 1 ms returned unsat
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using 3 positive place invariants in 12 ms returned unsat
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using 3 positive place invariants in 1 ms returned sat
[2022-06-12 22:44:15] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using state equation in 6 ms returned sat
[2022-06-12 22:44:15] [INFO ] Computed and/alt/rep : 5/5/5 causal constraints (skipped 0 transitions) in 1 ms.
[2022-06-12 22:44:15] [INFO ] Added : 2 causal constraints over 1 iterations in 5 ms. Result :sat
Attempting to minimize the solution found.
Minimization took 1 ms.
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using 3 positive place invariants in 1 ms returned sat
[2022-06-12 22:44:15] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using state equation in 3 ms returned sat
[2022-06-12 22:44:15] [INFO ] Solution in real domain found non-integer solution.
[2022-06-12 22:44:15] [INFO ] [Nat]Absence check using 3 positive place invariants in 0 ms returned sat
[2022-06-12 22:44:15] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2022-06-12 22:44:15] [INFO ] [Nat]Absence check using state equation in 2 ms returned sat
[2022-06-12 22:44:15] [INFO ] Computed and/alt/rep : 5/5/5 causal constraints (skipped 0 transitions) in 1 ms.
[2022-06-12 22:44:15] [INFO ] Added : 2 causal constraints over 1 iterations in 9 ms. Result :sat
Attempting to minimize the solution found.
Minimization took 3 ms.
[2022-06-12 22:44:15] [INFO ] [Real]Absence check using 3 positive place invariants in 1 ms returned unsat
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-15 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-11 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-10 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-06 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-04 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-01 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
Fused 13 Parikh solutions to 7 different solutions.
Incomplete Parikh walk after 921400 steps, including 99 resets, run finished after 738 ms. (steps per millisecond=1248 ) properties (out of 7) seen :5 could not realise parikh vector
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-14 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-09 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-07 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-02 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-00 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
Incomplete Parikh walk after 375300 steps, including 98 resets, run finished after 237 ms. (steps per millisecond=1583 ) properties (out of 2) seen :0 could not realise parikh vector
Incomplete Parikh walk after 750300 steps, including 98 resets, run finished after 511 ms. (steps per millisecond=1468 ) properties (out of 2) seen :0 could not realise parikh vector
Incomplete Parikh walk after 1311800 steps, including 99 resets, run finished after 522 ms. (steps per millisecond=2513 ) properties (out of 2) seen :1 could not realise parikh vector
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-08 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
Incomplete Parikh walk after 750100 steps, including 99 resets, run finished after 288 ms. (steps per millisecond=2604 ) properties (out of 1) seen :0 could not realise parikh vector
Finished Parikh walk after 8609 steps, including 1 resets, run visited all 1 properties in 6 ms. (steps per millisecond=1434 )
FORMULA TwoPhaseLocking-PT-nC05000vN-ReachabilityCardinality-12 TRUE TECHNIQUES TOPOLOGICAL PARIKH_WALK
All properties solved without resorting to model-checking.

BK_STOP 1655073858965

--------------------
content from stderr:

+ export BINDIR=/home/mcc/BenchKit/bin//../
+ BINDIR=/home/mcc/BenchKit/bin//../
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ ReachabilityCardinality = StateSpace ]]
+ /home/mcc/BenchKit/bin//..//runeclipse.sh /home/mcc/execution ReachabilityCardinality -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600
+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
++ cut -d . -f 9
++ ls /home/mcc/BenchKit/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202104292328.jar
+ VERSION=0
+ echo 'Running Version 0'
+ /home/mcc/BenchKit/bin//..//itstools/its-tools -data /home/mcc/execution/workspace -pnfolder /home/mcc/execution -examination ReachabilityCardinality -spotpath /home/mcc/BenchKit/bin//..//ltlfilt -z3path /home/mcc/BenchKit/bin//..//z3/bin/z3 -yices2path /home/mcc/BenchKit/bin//..//yices/bin/yices -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600 -vmargs -Dosgi.locking=none -Declipse.stateSaveDelayInterval=-1 -Dosgi.configuration.area=/tmp/.eclipse -Xss128m -Xms40m -Xmx16000m

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="TwoPhaseLocking-PT-nC05000vN"
export BK_EXAMINATION="ReachabilityCardinality"
export BK_TOOL="gold2021"
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 2-4028"
echo " Executing tool gold2021"
echo " Input is TwoPhaseLocking-PT-nC05000vN, examination is ReachabilityCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r269-tall-165303553600326"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/TwoPhaseLocking-PT-nC05000vN.tgz
mv TwoPhaseLocking-PT-nC05000vN execution
cd execution
if [ "ReachabilityCardinality" = "ReachabilityDeadlock" ] || [ "ReachabilityCardinality" = "UpperBounds" ] || [ "ReachabilityCardinality" = "QuasiLiveness" ] || [ "ReachabilityCardinality" = "StableMarking" ] || [ "ReachabilityCardinality" = "Liveness" ] || [ "ReachabilityCardinality" = "OneSafe" ] || [ "ReachabilityCardinality" = "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 [ "ReachabilityCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityCardinality" != "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 "ReachabilityCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property ReachabilityCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "ReachabilityCardinality.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 '' ReachabilityCardinality.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "ReachabilityCardinality" = "ReachabilityDeadlock" ] || [ "ReachabilityCardinality" = "QuasiLiveness" ] || [ "ReachabilityCardinality" = "StableMarking" ] || [ "ReachabilityCardinality" = "Liveness" ] || [ "ReachabilityCardinality" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityCardinality"
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 ;