About the Execution of ITS-Tools for SemanticWebServices-PT-S064P18
| Execution Summary | |||||
| Max Memory Used (MB) |
Time wait (ms) | CPU Usage (ms) | I/O Wait (ms) | Computed Result | Execution Status |
| 758.151 | 9925.00 | 23975.00 | 472.30 | FTFTTTFTFTTTFTTT | normal |
Execution Chart
We display below the execution chart for this examination (boot time has been removed).
Trace from the execution
Formatting '/data/fkordon/mcc2023-input.r357-smll-167891806300375.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2023-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 2-5348
Executing tool itstools
Input is SemanticWebServices-PT-S064P18, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r357-smll-167891806300375
=====================================================================
--------------------
preparation of the directory to be used:
/home/mcc/execution
total 584K
-rw-r--r-- 1 mcc users 6.2K Feb 26 10:21 CTLCardinality.txt
-rw-r--r-- 1 mcc users 65K Feb 26 10:21 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.7K Feb 26 10:21 CTLFireability.txt
-rw-r--r-- 1 mcc users 50K Feb 26 10:21 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.8K Feb 25 16:50 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K Feb 25 16:50 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.4K Feb 25 16:50 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Feb 25 16:50 LTLFireability.xml
-rw-r--r-- 1 mcc users 11K Feb 26 10:22 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 105K Feb 26 10:22 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 7.9K Feb 26 10:22 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 66K Feb 26 10:22 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.8K Feb 25 16:50 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.9K Feb 25 16:50 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 equiv_col
-rw-r--r-- 1 mcc users 8 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 173K Mar 5 18:23 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 SemanticWebServices-PT-S064P18-ReachabilityFireability-00
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-01
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-02
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-03
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-04
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-05
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-06
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-07
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-08
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-09
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-10
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-11
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-12
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-13
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-14
FORMULA_NAME SemanticWebServices-PT-S064P18-ReachabilityFireability-15
=== Now, execution of the tool begins
BK_START 1679171759672
bash -c /home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n "BK_STOP " ; date -u +%s%3N
Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=ReachabilityFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=SemanticWebServices-PT-S064P18
Not applying reductions.
Model is PT
ReachabilityFireability PT
Running Version 202303021504
[2023-03-18 20:36:02] [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]
[2023-03-18 20:36:02] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-18 20:36:02] [INFO ] Load time of PNML (sax parser for PT used): 125 ms
[2023-03-18 20:36:02] [INFO ] Transformed 154 places.
[2023-03-18 20:36:02] [INFO ] Transformed 236 transitions.
[2023-03-18 20:36:02] [INFO ] Parsed PT model containing 154 places and 236 transitions and 1265 arcs in 329 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 26 ms.
Working with output stream class java.io.PrintStream
Deduced a syphon composed of 2 places in 3 ms
Reduce places removed 2 places and 2 transitions.
Ensure Unique test removed 122 transitions
Reduce redundant transitions removed 122 transitions.
[2023-03-18 20:36:03] [INFO ] Flatten gal took : 123 ms
[2023-03-18 20:36:03] [INFO ] Flatten gal took : 50 ms
[2023-03-18 20:36:03] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality12872438100641804813.gal : 83 ms
[2023-03-18 20:36:03] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality2948026530837637358.prop : 2 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202303021504/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality12872438100641804813.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality2948026530837637358.prop' '--nowitness' '--gen-order' 'FOLLOW'
its-reach command run as :
/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202303021504/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...329
Loading property file /tmp/ReachabilityCardinality2948026530837637358.prop.
SDD proceeding with computation,16 properties remain. new max is 4
SDD size :1 after 5
SDD proceeding with computation,16 properties remain. new max is 8
SDD size :5 after 18
SDD proceeding with computation,16 properties remain. new max is 16
SDD size :18 after 852
Incomplete random walk after 10000 steps, including 2 resets, run finished after 930 ms. (steps per millisecond=10 ) properties (out of 16) seen :14
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-15 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-14 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-13 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-12 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-10 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-09 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-08 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-07 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-06 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-05 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-03 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-02 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-01 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-00 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Incomplete Best-First random walk after 10000 steps, including 3 resets, run finished after 43 ms. (steps per millisecond=232 ) properties (out of 2) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 47 ms. (steps per millisecond=212 ) properties (out of 2) seen :0
Reachability property SemanticWebServices-PT-S064P18-ReachabilityFireability-13 is true.
Running SMT prover for 2 properties.
[2023-03-18 20:36:04] [INFO ] Flow matrix only has 103 transitions (discarded 9 similar events)
// Phase 1: matrix 103 rows 152 cols
[2023-03-18 20:36:04] [INFO ] Computed 52 place invariants in 17 ms
[2023-03-18 20:36:04] [INFO ] [Real]Absence check using 2 positive place invariants in 4 ms returned sat
[2023-03-18 20:36:04] [INFO ] [Real]Absence check using 2 positive and 50 generalized place invariants in 17 ms returned sat
Invariant property SemanticWebServices-PT-S064P18-ReachabilityFireability-12 does not hold.
Reachability property SemanticWebServices-PT-S064P18-ReachabilityFireability-09 is true.
Reachability property SemanticWebServices-PT-S064P18-ReachabilityFireability-05 is true.
[2023-03-18 20:36:04] [INFO ] After 407ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:2
[2023-03-18 20:36:04] [INFO ] [Nat]Absence check using 2 positive place invariants in 1 ms returned sat
[2023-03-18 20:36:04] [INFO ] [Nat]Absence check using 2 positive and 50 generalized place invariants in 12 ms returned sat
Reachability property SemanticWebServices-PT-S064P18-ReachabilityFireability-03 is true.
SDD proceeding with computation,11 properties remain. new max is 16
[2023-03-18 20:36:04] [INFO ] After 102ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :2
SDD size :852 after 202758
[2023-03-18 20:36:04] [INFO ] State equation strengthened by 93 read => feed constraints.
[2023-03-18 20:36:04] [INFO ] After 45ms SMT Verify possible using 93 Read/Feed constraints in natural domain returned unsat :0 sat :2
[2023-03-18 20:36:04] [INFO ] After 92ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :2
Attempting to minimize the solution found.
Minimization took 60 ms.
[2023-03-18 20:36:04] [INFO ] After 385ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :2
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-04 TRUE TECHNIQUES TOPOLOGICAL PARIKH_WALK
Parikh walk visited 1 properties in 6 ms.
Support contains 38 out of 152 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 152/152 places, 112/112 transitions.
Graph (complete) has 381 edges and 152 vertex of which 108 are kept as prefixes of interest. Removing 44 places using SCC suffix rule.2 ms
Discarding 44 places :
Also discarding 28 output transitions
Drop transitions removed 28 transitions
Ensure Unique test removed 23 places
Drop transitions removed 12 transitions
Reduce isomorphic transitions removed 12 transitions.
Iterating post reduction 0 with 35 rules applied. Total rules applied 36 place count 85 transition count 72
Discarding 1 places :
Symmetric choice reduction at 1 with 1 rule applications. Total rules 37 place count 84 transition count 71
Iterating global reduction 1 with 1 rules applied. Total rules applied 38 place count 84 transition count 71
Ensure Unique test removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Iterating post reduction 1 with 1 rules applied. Total rules applied 39 place count 84 transition count 70
Free-agglomeration rule applied 1 times.
Iterating global reduction 2 with 1 rules applied. Total rules applied 40 place count 84 transition count 69
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 2 with 1 rules applied. Total rules applied 41 place count 83 transition count 69
Reduce places removed 1 places and 1 transitions.
Iterating global reduction 3 with 1 rules applied. Total rules applied 42 place count 82 transition count 68
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 3 with 1 rules applied. Total rules applied 43 place count 81 transition count 68
Applied a total of 43 rules in 71 ms. Remains 81 /152 variables (removed 71) and now considering 68/112 (removed 44) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 71 ms. Remains : 81/152 places, 68/112 transitions.
Incomplete random walk after 10002 steps, including 2 resets, run finished after 109 ms. (steps per millisecond=91 ) properties (out of 1) seen :0
Incomplete Best-First random walk after 10000 steps, including 2 resets, run finished after 43 ms. (steps per millisecond=232 ) properties (out of 1) seen :0
SDD proceeding with computation,11 properties remain. new max is 32
SDD size :202758 after 3.27182e+06
SDD proceeding with computation,11 properties remain. new max is 64
SDD size :3.27182e+06 after 4.64409e+07
Interrupted probabilistic random walk after 2013740 steps, run timeout after 3001 ms. (steps per millisecond=671 ) properties seen :{}
Probabilistic random walk after 2013740 steps, saw 1867027 distinct states, run finished after 3003 ms. (steps per millisecond=670 ) properties seen :0
Running SMT prover for 1 properties.
// Phase 1: matrix 68 rows 81 cols
[2023-03-18 20:36:08] [INFO ] Computed 16 place invariants in 4 ms
[2023-03-18 20:36:08] [INFO ] [Real]Absence check using 1 positive place invariants in 1 ms returned sat
[2023-03-18 20:36:08] [INFO ] [Real]Absence check using 1 positive and 15 generalized place invariants in 7 ms returned sat
[2023-03-18 20:36:08] [INFO ] After 127ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:1
[2023-03-18 20:36:08] [INFO ] [Nat]Absence check using 1 positive place invariants in 0 ms returned sat
[2023-03-18 20:36:08] [INFO ] [Nat]Absence check using 1 positive and 15 generalized place invariants in 3 ms returned sat
[2023-03-18 20:36:08] [INFO ] After 48ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :1
[2023-03-18 20:36:08] [INFO ] State equation strengthened by 55 read => feed constraints.
[2023-03-18 20:36:08] [INFO ] After 19ms SMT Verify possible using 55 Read/Feed constraints in natural domain returned unsat :0 sat :1
[2023-03-18 20:36:08] [INFO ] After 34ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :1
Attempting to minimize the solution found.
Minimization took 12 ms.
[2023-03-18 20:36:08] [INFO ] After 154ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :1
Finished Parikh walk after 44 steps, including 0 resets, run visited all 1 properties in 1 ms. (steps per millisecond=44 )
FORMULA SemanticWebServices-PT-S064P18-ReachabilityFireability-11 TRUE TECHNIQUES TOPOLOGICAL PARIKH_WALK
Parikh walk visited 1 properties in 1 ms.
ITS runner failed with exception null
java.lang.InterruptedException
at java.base/java.lang.Object.wait(Native Method)
at java.base/java.lang.Thread.join(Thread.java:1304)
at java.base/java.lang.Thread.join(Thread.java:1372)
at fr.lip6.move.gal.application.runner.AbstractRunner.join(AbstractRunner.java:27)
at fr.lip6.move.gal.application.runner.its.ITSRunner.join(ITSRunner.java:177)
at fr.lip6.move.gal.application.solver.global.GlobalPropertySolver.verifyWithSDD(GlobalPropertySolver.java:675)
at fr.lip6.move.gal.application.solver.ReachabilitySolver.lambda$2(ReachabilitySolver.java:63)
at java.base/java.lang.Thread.run(Thread.java:833)
All properties solved without resorting to model-checking.
Total runtime 5922 ms.
BK_STOP 1679171769597
--------------------
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_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /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="SemanticWebServices-PT-S064P18"
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 2-5348"
echo " Executing tool itstools"
echo " Input is SemanticWebServices-PT-S064P18, 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 r357-smll-167891806300375"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"
tar xzf /home/mcc/BenchKit/INPUTS/SemanticWebServices-PT-S064P18.tgz
mv SemanticWebServices-PT-S064P18 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 '
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 ;