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.r283-smll-165307356000187.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 itstools
Input is ViralEpidemic-PT-S02D1C1A10, examination is QuasiLiveness
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r283-smll-165307356000187
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 9.1M
-rw-r--r-- 1 mcc users 8.5K Apr 29 12:26 CTLCardinality.txt
-rw-r--r-- 1 mcc users 70K Apr 29 12:26 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.0K Apr 29 12:20 CTLFireability.txt
-rw-r--r-- 1 mcc users 40K Apr 29 12:20 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 10 09:34 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 5.5K May 9 09:21 LTLCardinality.txt
-rw-r--r-- 1 mcc users 30K May 9 09:21 LTLCardinality.xml
-rw-r--r-- 1 mcc users 3.2K May 9 09:21 LTLFireability.txt
-rw-r--r-- 1 mcc users 19K May 9 09:21 LTLFireability.xml
-rw-r--r-- 1 mcc users 2.0K May 9 09:21 UpperBounds.txt
-rw-r--r-- 1 mcc users 4.0K May 9 09:21 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 10 09:34 equiv_col
-rw-r--r-- 1 mcc users 11 May 10 09:34 instance
-rw-r--r-- 1 mcc users 6 May 10 09:34 iscolored
-rw-r--r-- 1 mcc users 8.8M 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

FORMULA_NAME QuasiLiveness

=== Now, execution of the tool begins

BK_START 1653145762244

Running Version 202205111006
[2022-05-21 15:09:24] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, QuasiLiveness, -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, 1800]
[2022-05-21 15:09:24] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2022-05-21 15:09:25] [INFO ] Load time of PNML (sax parser for PT used): 1177 ms
[2022-05-21 15:09:25] [INFO ] Transformed 8189 places.
[2022-05-21 15:09:25] [INFO ] Transformed 10235 transitions.
[2022-05-21 15:09:25] [INFO ] Found NUPN structural information;
[2022-05-21 15:09:25] [INFO ] Parsed PT model containing 8189 places and 10235 transitions in 1559 ms.
Starting structural reductions in LIVENESS mode, iteration 0 : 8189/8189 places, 10235/10235 transitions.
Applied a total of 0 rules in 1055 ms. Remains 8189 /8189 variables (removed 0) and now considering 10235/10235 (removed 0) transitions.
// Phase 1: matrix 10235 rows 8189 cols
[2022-05-21 15:09:28] [INFO ] Invariants computation overflowed in 1672 ms
[2022-05-21 15:09:31] [INFO ] Implicit Places using invariants in 4061 ms returned []
Implicit Place search using SMT only with invariants took 4106 ms to find 0 implicit places.
// Phase 1: matrix 10235 rows 8189 cols
[2022-05-21 15:09:32] [INFO ] Invariants computation overflowed in 1323 ms
[2022-05-21 15:09:34] [INFO ] Dead Transitions using invariants and state equation in 3617 ms found 0 transitions.
Finished structural reductions, in 1 iterations. Remains : 8189/8189 places, 10235/10235 transitions.
Discarding 2046 transitions out of 10235. Remains 8189
Initial state reduction rules removed 1 formulas.
Incomplete random walk after 10000 steps, including 996 resets, run finished after 12398 ms. (steps per millisecond=0 ) properties (out of 8188) seen :1524
Running SMT prover for 6664 properties.
// Phase 1: matrix 10235 rows 8189 cols
[2022-05-21 15:09:49] [INFO ] Invariants computation overflowed in 1310 ms
[2022-05-21 15:10:24] [WARNING] SMT solver failed with error :SMT solver raised an error when submitting script.... while checking expressions.
[2022-05-21 15:10:24] [INFO ] After 25114ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0
Fused 6664 Parikh solutions to 1 different solutions.
Parikh walk visited 0 properties in 2 ms.
Support contains 6664 out of 8189 places. Attempting structural reductions.
Starting structural reductions in SAFETY mode, iteration 0 : 8189/8189 places, 10235/10235 transitions.
Graph (complete) has 4094 edges and 8189 vertex of which 7271 are kept as prefixes of interest. Removing 918 places using SCC suffix rule.33 ms
Discarding 918 places :
Also discarding 370 output transitions
Drop transitions removed 370 transitions
Drop transitions removed 1212 transitions
Reduce isomorphic transitions removed 1212 transitions.
Drop transitions removed 1 transitions
Trivial Post-agglo rules discarded 1 transitions
Performed 1 trivial Post agglomeration. Transition count delta: 1
Iterating post reduction 0 with 1213 rules applied. Total rules applied 1214 place count 7271 transition count 8652
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 1 with 1 rules applied. Total rules applied 1215 place count 7270 transition count 8652
Performed 39 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 2 with 39 Pre rules applied. Total rules applied 1215 place count 7270 transition count 8613
Deduced a syphon composed of 39 places in 17 ms
Reduce places removed 39 places and 0 transitions.
Iterating global reduction 2 with 78 rules applied. Total rules applied 1293 place count 7231 transition count 8613
Performed 282 Post agglomeration using F-continuation condition.Transition count delta: 282
Deduced a syphon composed of 282 places in 7 ms
Reduce places removed 282 places and 0 transitions.
Iterating global reduction 2 with 564 rules applied. Total rules applied 1857 place count 6949 transition count 8331
Renaming transitions due to excessive name length > 1024 char.
Reduce places removed 1 places and 1 transitions.
Iterating global reduction 2 with 1 rules applied. Total rules applied 1858 place count 6948 transition count 8330
Applied a total of 1858 rules in 1185 ms. Remains 6948 /8189 variables (removed 1241) and now considering 8330/10235 (removed 1905) transitions.
Finished structural reductions, in 1 iterations. Remains : 6948/8189 places, 8330/10235 transitions.
Interrupted random walk after 62331 steps, including 45 resets, run timeout after 30001 ms. (steps per millisecond=2 ) properties seen 6448
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 856 ms. (steps per millisecond=11 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 808 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 961 ms. (steps per millisecond=10 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 851 ms. (steps per millisecond=11 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 805 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 802 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 765 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 800 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 762 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 797 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 784 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 765 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 792 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 762 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 823 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 806 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 820 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 815 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 776 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 788 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 775 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 787 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 793 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 791 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 798 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 763 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 772 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 762 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 772 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 768 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 763 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 771 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 761 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 801 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 820 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 789 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 769 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 761 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 781 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 758 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 772 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 777 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 764 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 769 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 762 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 969 ms. (steps per millisecond=10 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 760 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 771 ms. (steps per millisecond=12 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 767 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 764 ms. (steps per millisecond=13 ) properties (out of 216) seen :0
Running SMT prover for 216 properties.
// Phase 1: matrix 8330 rows 6948 cols
[2022-05-21 15:11:35] [INFO ] Computed 284 place invariants in 726 ms
[2022-05-21 15:12:12] [INFO ] [Real]Absence check using 0 positive and 284 generalized place invariants in 222 ms returned sat
[2022-05-21 15:12:56] [INFO ] After 80271ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:216
[2022-05-21 15:14:32] [INFO ] SMT solver returned unknown. Retrying;
[2022-05-21 15:14:32] [INFO ] [Nat]Absence check using 0 positive and 284 generalized place invariants in 61448 ms returned sat
[2022-05-21 15:16:41] [INFO ] After 79399ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :214
[2022-05-21 15:16:41] [INFO ] After 79415ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :214
Attempting to minimize the solution found.
Minimization took 4 ms.
[2022-05-21 15:16:41] [INFO ] After 225034ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :214
Fused 216 Parikh solutions to 1 different solutions.
Parikh walk visited 0 properties in 0 ms.
Support contains 216 out of 6948 places. Attempting structural reductions.
Starting structural reductions in SAFETY mode, iteration 0 : 6948/6948 places, 8330/8330 transitions.
Graph (complete) has 3332 edges and 6948 vertex of which 379 are kept as prefixes of interest. Removing 6569 places using SCC suffix rule.3 ms
Discarding 6569 places :
Also discarding 7665 output transitions
Drop transitions removed 7665 transitions
Drop transitions removed 284 transitions
Reduce isomorphic transitions removed 284 transitions.
Drop transitions removed 41 transitions
Trivial Post-agglo rules discarded 41 transitions
Performed 41 trivial Post agglomeration. Transition count delta: 41
Iterating post reduction 0 with 325 rules applied. Total rules applied 326 place count 379 transition count 340
Reduce places removed 41 places and 0 transitions.
Iterating post reduction 1 with 41 rules applied. Total rules applied 367 place count 338 transition count 340
Performed 39 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 2 with 39 Pre rules applied. Total rules applied 367 place count 338 transition count 301
Deduced a syphon composed of 39 places in 0 ms
Reduce places removed 39 places and 0 transitions.
Iterating global reduction 2 with 78 rules applied. Total rules applied 445 place count 299 transition count 301
Performed 23 Post agglomeration using F-continuation condition.Transition count delta: 23
Deduced a syphon composed of 23 places in 0 ms
Reduce places removed 23 places and 0 transitions.
Iterating global reduction 2 with 46 rules applied. Total rules applied 491 place count 276 transition count 278
Reduce places removed 8 places and 8 transitions.
Iterating global reduction 2 with 8 rules applied. Total rules applied 499 place count 268 transition count 270
Applied a total of 499 rules in 68 ms. Remains 268 /6948 variables (removed 6680) and now considering 270/8330 (removed 8060) transitions.
Finished structural reductions, in 1 iterations. Remains : 268/6948 places, 270/8330 transitions.
Finished random walk after 351 steps, including 2 resets, run visited all 216 properties in 54 ms. (steps per millisecond=6 )
Able to resolve query QuasiLiveness after proving 8189 properties.
FORMULA QuasiLiveness TRUE TECHNIQUES RANDOM_WALK TOPOLOGICAL INITIAL_STATE
Total runtime 437358 ms.

BK_STOP 1653146201671

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

+ export LANG=C
+ LANG=C
+ export BINDIR=/home/mcc/BenchKit/bin//../
+ BINDIR=/home/mcc/BenchKit/bin//../
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ QuasiLiveness = StateSpace ]]
+ /home/mcc/BenchKit/bin//..//runeclipse.sh /home/mcc/execution QuasiLiveness -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//..//greatspn/ -order META -manyOrder -smt -timeout 1800
+ ulimit -s 65536
+ export PYTHONPATH=/usr/lib/python3.9/site-packages/
+ PYTHONPATH=/usr/lib/python3.9/site-packages/
+ export LD_LIBRARY_PATH=/usr/local/lib:
+ LD_LIBRARY_PATH=/usr/local/lib:
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202205111006.jar
+ VERSION=202205111006
+ echo 'Running Version 202205111006'
+ /home/mcc/BenchKit/bin//..//itstools/its-tools -data @none -pnfolder /home/mcc/execution -examination QuasiLiveness -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 1800 -vmargs -Dosgi.locking=none -Declipse.stateSaveDelayInterval=-1 -Dosgi.configuration.area=@none -Xss128m -Xms40m -Xmx8192m

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="ViralEpidemic-PT-S02D1C1A10"
export BK_EXAMINATION="QuasiLiveness"
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 2-4028"
echo " Executing tool itstools"
echo " Input is ViralEpidemic-PT-S02D1C1A10, examination is QuasiLiveness"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r283-smll-165307356000187"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/ViralEpidemic-PT-S02D1C1A10.tgz
mv ViralEpidemic-PT-S02D1C1A10 execution
cd execution
if [ "QuasiLiveness" = "ReachabilityDeadlock" ] || [ "QuasiLiveness" = "UpperBounds" ] || [ "QuasiLiveness" = "QuasiLiveness" ] || [ "QuasiLiveness" = "StableMarking" ] || [ "QuasiLiveness" = "Liveness" ] || [ "QuasiLiveness" = "OneSafe" ] || [ "QuasiLiveness" = "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 [ "QuasiLiveness" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "QuasiLiveness" != "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 "QuasiLiveness.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property QuasiLiveness.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "QuasiLiveness.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 '' QuasiLiveness.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "QuasiLiveness" = "ReachabilityDeadlock" ] || [ "QuasiLiveness" = "QuasiLiveness" ] || [ "QuasiLiveness" = "StableMarking" ] || [ "QuasiLiveness" = "Liveness" ] || [ "QuasiLiveness" = "OneSafe" ] ; then
echo "FORMULA_NAME QuasiLiveness"
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 ;