Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2024-input.r378-smll-171683811300351.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2024-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 2-5568
Executing tool itstools
Input is SmartHome-PT-02, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r378-smll-171683811300351
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 460K
-rw-r--r-- 1 mcc users 4.7K May 14 13:22 CTLCardinality.txt
-rw-r--r-- 1 mcc users 45K May 14 13:22 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.5K May 14 13:22 CTLFireability.txt
-rw-r--r-- 1 mcc users 66K May 14 13:22 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 18 16:43 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.8K May 18 16:43 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 3.4K Apr 23 07:57 LTLCardinality.txt
-rw-r--r-- 1 mcc users 24K Apr 23 07:57 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Apr 23 07:57 LTLFireability.txt
-rw-r--r-- 1 mcc users 19K Apr 23 07:57 LTLFireability.xml
-rw-r--r-- 1 mcc users 9.2K Apr 12 04:05 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 98K Apr 12 04:05 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 9.4K Apr 12 04:01 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 86K Apr 12 04:01 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Apr 23 07:57 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Apr 23 07:57 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 18 16:43 equiv_col
-rw-r--r-- 1 mcc users 3 May 18 16:43 instance
-rw-r--r-- 1 mcc users 6 May 18 16:43 iscolored
-rw-r--r-- 1 mcc users 27K May 18 16:43 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 SmartHome-PT-02-ReachabilityFireability-2024-00
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-01
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-02
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-03
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-04
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-05
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-06
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-07
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-08
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-09
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-10
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-11
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-12
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-13
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-14
FORMULA_NAME SmartHome-PT-02-ReachabilityFireability-2024-15

=== Now, execution of the tool begins

BK_START 1717029283384

Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=ReachabilityFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=SmartHome-PT-02
BK_MEMORY_CONFINEMENT=16384
Not applying reductions.
Model is PT
ReachabilityFireability PT
Running Version 202405141337
[2024-05-30 00:34:45] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2024-05-30 00:34:45] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2024-05-30 00:34:45] [INFO ] Load time of PNML (sax parser for PT used): 158 ms
[2024-05-30 00:34:45] [INFO ] Transformed 41 places.
[2024-05-30 00:34:45] [INFO ] Transformed 127 transitions.
[2024-05-30 00:34:45] [INFO ] Found NUPN structural information;
[2024-05-30 00:34:45] [INFO ] Parsed PT model containing 41 places and 127 transitions and 359 arcs in 331 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 29 ms.
Working with output stream class java.io.PrintStream
Initial state reduction rules removed 3 formulas.
Ensure Unique test removed 66 transitions
Reduce redundant transitions removed 66 transitions.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-09 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-11 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-14 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2024-05-30 00:34:46] [INFO ] Flatten gal took : 49 ms
[2024-05-30 00:34:46] [INFO ] Flatten gal took : 38 ms
[2024-05-30 00:34:46] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality17632531800981324305.gal : 15 ms
[2024-05-30 00:34:46] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality18381307485711868655.prop : 11 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202405141337/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality17632531800981324305.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality18381307485711868655.prop' '--nowitness' '--gen-order' 'FOLLOW'

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202405141337/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...330
Loading property file /tmp/ReachabilityCardinality18381307485711868655.prop.
Invariant property SmartHome-PT-02-ReachabilityFireability-2024-15 does not hold.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-15 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
Invariant property SmartHome-PT-02-ReachabilityFireability-2024-12 does not hold.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-12 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
Reachability property SmartHome-PT-02-ReachabilityFireability-2024-10 is true.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-10 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
SDD proceeding with computation,10 properties remain. new max is 2
SDD size :1 after 9
SDD proceeding with computation,10 properties remain. new max is 4
SDD size :9 after 17
Reachability property SmartHome-PT-02-ReachabilityFireability-2024-13 is true.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-13 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
SDD proceeding with computation,9 properties remain. new max is 4
SDD size :17 after 65
SDD proceeding with computation,9 properties remain. new max is 8
SDD size :65 after 385
SDD proceeding with computation,9 properties remain. new max is 16
SDD size :385 after 2305
SDD proceeding with computation,9 properties remain. new max is 32
SDD size :2305 after 4113
SDD proceeding with computation,9 properties remain. new max is 64
SDD size :4113 after 4225
RANDOM walk for 40000 steps (8 resets) in 2555 ms. (15 steps per ms) remains 8/13 properties
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-04 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
SDD proceeding with computation,9 properties remain. new max is 128
SDD size :4225 after 31105
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
petri\_inst\_inst,86401,0.30573,4680,2,244,16,4788,15,0,406,1877,0
Total reachable state count : 86401

Verifying 13 reachability properties.
Reachability property SmartHome-PT-02-ReachabilityFireability-2024-00 does not hold.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-00 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
No reachable states exhibit your property : SmartHome-PT-02-ReachabilityFireability-2024-00

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-00,0,0.306602,4680,1,0,16,4788,15,0,410,1877,0
Invariant property SmartHome-PT-02-ReachabilityFireability-2024-01 is true.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-01 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING

BEST_FIRST walk for 40004 steps (8 resets) in 327 ms. (121 steps per ms) remains 8/8 properties
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-01,0,0.310352,4940,1,0,16,4788,15,0,434,1877,0
Reachability property SmartHome-PT-02-ReachabilityFireability-2024-02 does not hold.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-02 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
No reachable states exhibit your property : SmartHome-PT-02-ReachabilityFireability-2024-02

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-02,0,0.312483,4940,1,0,16,4788,15,0,451,1877,0
Invariant property SmartHome-PT-02-ReachabilityFireability-2024-03 is true.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-03 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-03,0,0.314543,4940,1,0,16,4788,15,0,461,1877,0
Reachability property SmartHome-PT-02-ReachabilityFireability-2024-04 is true.

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-04,288,0.320696,4940,2,146,16,4788,15,0,500,1877,0
Reachability property SmartHome-PT-02-ReachabilityFireability-2024-05 does not hold.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-05 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
No reachable states exhibit your property : SmartHome-PT-02-ReachabilityFireability-2024-05

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-05,0,0.321346,4940,1,0,16,4788,15,0,503,1877,0
Reachability property SmartHome-PT-02-ReachabilityFireability-2024-06 does not hold.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-06 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
No reachable states exhibit your property : SmartHome-PT-02-ReachabilityFireability-2024-06

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-06,0,0.323281,4940,1,0,16,4788,15,0,512,1877,0
Invariant property SmartHome-PT-02-ReachabilityFireability-2024-07 is true.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-07 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-07,0,0.328276,4940,1,0,16,4788,15,0,535,1877,0
Reachability property SmartHome-PT-02-ReachabilityFireability-2024-08 does not hold.
FORMULA SmartHome-PT-02-ReachabilityFireability-2024-08 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
No reachable states exhibit your property : SmartHome-PT-02-ReachabilityFireability-2024-08

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-08,0,0.330896,4940,1,0,16,4788,15,0,546,1877,0
Reachability property SmartHome-PT-02-ReachabilityFireability-2024-10 is true.

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-10,8,0.335669,4940,2,60,16,4788,16,0,589,1877,0
Invariant property SmartHome-PT-02-ReachabilityFireability-2024-12 does not hold.

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-12,4,0.336041,4940,2,51,16,4788,17,0,590,1877,0
Reachability property SmartHome-PT-02-ReachabilityFireability-2024-13 is true.

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-13,5376,0.338056,4940,2,191,16,4788,18,0,600,1877,0
Invariant property SmartHome-PT-02-ReachabilityFireability-2024-15 does not hold.

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
SmartHome-PT-02-ReachabilityFireability-2024-15,192,0.338374,4940,2,153,16,4788,19,0,603,1877,0
BEST_FIRST walk for 40003 steps (8 resets) in 1095 ms. (36 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40004 steps (8 resets) in 250 ms. (159 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40003 steps (8 resets) in 207 ms. (192 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40003 steps (8 resets) in 123 ms. (322 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40003 steps (8 resets) in 122 ms. (325 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40004 steps (8 resets) in 229 ms. (173 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40004 steps (8 resets) in 143 ms. (277 steps per ms) remains 8/8 properties
All properties solved without resorting to model-checking.
Total runtime 2380 ms.

BK_STOP 1717029287981

--------------------
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
+ [[ ReachabilityFireability = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution ReachabilityFireability -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
+ export PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ export LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
+ LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202405141337.jar
+ VERSION=202405141337
+ echo 'Running Version 202405141337'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityFireability -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="SmartHome-PT-02"
export BK_EXAMINATION="ReachabilityFireability"
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 2-5568"
echo " Executing tool itstools"
echo " Input is SmartHome-PT-02, examination is ReachabilityFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r378-smll-171683811300351"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/SmartHome-PT-02.tgz
mv SmartHome-PT-02 execution
cd execution
if [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "UpperBounds" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] || [ "ReachabilityFireability" = "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 [ "ReachabilityFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityFireability" != "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 "ReachabilityFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property ReachabilityFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "ReachabilityFireability.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 '' ReachabilityFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityFireability"
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 ;