fond
Model Checking Contest 2024
14th edition, Geneva, Switzerland, June 25, 2024
Execution of r417-tall-171690556300346
Last Updated
July 7, 2024

About the Execution of 2023-gold for Sudoku-COL-BN09

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
265.848 11358.00 16379.00 226.90 81 81 81 81 81 81 81 81 81 81 81 81 81 81 81 81 normal

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.r417-tall-171690556300346.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 gold2023
Input is Sudoku-COL-BN09, examination is UpperBounds
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r417-tall-171690556300346
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 560K
-rw-r--r-- 1 mcc users 7.0K Apr 12 12:10 CTLCardinality.txt
-rw-r--r-- 1 mcc users 72K Apr 12 12:10 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.7K Apr 12 11:50 CTLFireability.txt
-rw-r--r-- 1 mcc users 63K Apr 12 11:50 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 18 16:43 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 3.6K Apr 23 08:01 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K Apr 23 08:01 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K Apr 23 08:01 LTLFireability.txt
-rw-r--r-- 1 mcc users 16K Apr 23 08:01 LTLFireability.xml
-rw-r--r-- 1 mcc users 11K Apr 12 12:33 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 106K Apr 12 12:33 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 6.9K Apr 12 12:11 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 52K Apr 12 12:11 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Apr 23 08:01 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Apr 23 08:01 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 May 18 16:43 equiv_pt
-rw-r--r-- 1 mcc users 5 May 18 16:43 instance
-rw-r--r-- 1 mcc users 5 May 18 16:43 iscolored
-rw-r--r-- 1 mcc users 146K 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 positive values
NUM_VECTOR

here is the order used to build the result vector(from text file)
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-00
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-01
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-02
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-03
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-04
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-05
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-06
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-07
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-08
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-09
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-10
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-11
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-12
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-13
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-14
FORMULA_NAME Sudoku-COL-BN09-UpperBounds-15

=== Now, execution of the tool begins

BK_START 1717143412957

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=gold2023
BK_EXAMINATION=UpperBounds
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=Sudoku-COL-BN09
Not applying reductions.
Model is COL
UpperBounds COL
Running Version 202304061127
[2024-05-31 08:16:54] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, UpperBounds, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2024-05-31 08:16:54] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2024-05-31 08:16:54] [INFO ] Detected file is not PT type :http://www.pnml.org/version-2009/grammar/symmetricnet
log4j:WARN No appenders could be found for logger (org.apache.axiom.locator.DefaultOMMetaFactoryLocator).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
[2024-05-31 08:16:54] [WARNING] Using fallBack plugin, rng conformance not checked
[2024-05-31 08:16:55] [INFO ] Load time of PNML (colored model parsed with PNMLFW) : 692 ms
[2024-05-31 08:16:55] [INFO ] Imported 5 HL places and 1 HL transitions for a total of 1053 PT places and 6561.0 transition bindings in 21 ms.
Parsed 16 properties from file /home/mcc/execution/UpperBounds.xml in 5 ms.
[2024-05-31 08:16:55] [INFO ] Built PT skeleton of HLPN with 5 places and 1 transitions 5 arcs in 3 ms.
[2024-05-31 08:16:55] [INFO ] Skeletonized 16 HLPN properties in 0 ms.
// Phase 1: matrix 1 rows 5 cols
[2024-05-31 08:16:55] [INFO ] Computed 4 invariants in 6 ms
FORMULA Sudoku-COL-BN09-UpperBounds-11 81 TECHNIQUES TOPOLOGICAL CPN_APPROX INITIAL_STATE
FORMULA Sudoku-COL-BN09-UpperBounds-10 81 TECHNIQUES TOPOLOGICAL CPN_APPROX INITIAL_STATE
FORMULA Sudoku-COL-BN09-UpperBounds-09 81 TECHNIQUES TOPOLOGICAL CPN_APPROX INITIAL_STATE
FORMULA Sudoku-COL-BN09-UpperBounds-08 81 TECHNIQUES TOPOLOGICAL CPN_APPROX INITIAL_STATE
FORMULA Sudoku-COL-BN09-UpperBounds-07 81 TECHNIQUES TOPOLOGICAL CPN_APPROX INITIAL_STATE
FORMULA Sudoku-COL-BN09-UpperBounds-06 81 TECHNIQUES TOPOLOGICAL CPN_APPROX INITIAL_STATE
FORMULA Sudoku-COL-BN09-UpperBounds-05 81 TECHNIQUES TOPOLOGICAL CPN_APPROX INITIAL_STATE
FORMULA Sudoku-COL-BN09-UpperBounds-04 81 TECHNIQUES TOPOLOGICAL CPN_APPROX INITIAL_STATE
FORMULA Sudoku-COL-BN09-UpperBounds-03 81 TECHNIQUES TOPOLOGICAL CPN_APPROX INITIAL_STATE
FORMULA Sudoku-COL-BN09-UpperBounds-02 81 TECHNIQUES TOPOLOGICAL CPN_APPROX INITIAL_STATE
FORMULA Sudoku-COL-BN09-UpperBounds-01 81 TECHNIQUES TOPOLOGICAL CPN_APPROX INITIAL_STATE
FORMULA Sudoku-COL-BN09-UpperBounds-00 81 TECHNIQUES TOPOLOGICAL CPN_APPROX INITIAL_STATE
[2024-05-31 08:16:55] [INFO ] Invariant cache hit.
[2024-05-31 08:16:55] [INFO ] [Real]Absence check using 4 positive place invariants in 4 ms returned sat
[2024-05-31 08:16:55] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2024-05-31 08:16:55] [INFO ] [Real]Absence check using state equation in 6 ms returned sat
[2024-05-31 08:16:55] [INFO ] Solution in real domain found non-integer solution.
[2024-05-31 08:16:55] [INFO ] [Nat]Absence check using 4 positive place invariants in 2 ms returned sat
[2024-05-31 08:16:55] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2024-05-31 08:16:55] [INFO ] [Nat]Absence check using state equation in 4 ms returned sat
[2024-05-31 08:16:55] [INFO ] Computed and/alt/rep : 0/0/0 causal constraints (skipped 0 transitions) in 0 ms.
[2024-05-31 08:16:55] [INFO ] Added : 0 causal constraints over 0 iterations in 4 ms. Result :sat
Minimization took 3 ms.
[2024-05-31 08:16:55] [INFO ] [Real]Absence check using 4 positive place invariants in 2 ms returned sat
[2024-05-31 08:16:55] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2024-05-31 08:16:55] [INFO ] [Real]Absence check using state equation in 7 ms returned sat
[2024-05-31 08:16:55] [INFO ] Solution in real domain found non-integer solution.
[2024-05-31 08:16:55] [INFO ] [Nat]Absence check using 4 positive place invariants in 2 ms returned sat
[2024-05-31 08:16:55] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2024-05-31 08:16:55] [INFO ] [Nat]Absence check using state equation in 10 ms returned sat
[2024-05-31 08:16:55] [INFO ] Computed and/alt/rep : 0/0/0 causal constraints (skipped 0 transitions) in 1 ms.
[2024-05-31 08:16:55] [INFO ] Added : 0 causal constraints over 0 iterations in 6 ms. Result :sat
Minimization took 2 ms.
[2024-05-31 08:16:55] [INFO ] [Real]Absence check using 4 positive place invariants in 2 ms returned sat
[2024-05-31 08:16:55] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2024-05-31 08:16:55] [INFO ] [Real]Absence check using state equation in 2 ms returned sat
[2024-05-31 08:16:55] [INFO ] Solution in real domain found non-integer solution.
[2024-05-31 08:16:55] [INFO ] [Nat]Absence check using 4 positive place invariants in 1 ms returned sat
[2024-05-31 08:16:55] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2024-05-31 08:16:55] [INFO ] [Nat]Absence check using state equation in 3 ms returned sat
[2024-05-31 08:16:55] [INFO ] Computed and/alt/rep : 0/0/0 causal constraints (skipped 0 transitions) in 1 ms.
[2024-05-31 08:16:55] [INFO ] Added : 0 causal constraints over 0 iterations in 9 ms. Result :sat
Minimization took 2 ms.
[2024-05-31 08:16:55] [INFO ] [Real]Absence check using 4 positive place invariants in 1 ms returned sat
[2024-05-31 08:16:55] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2024-05-31 08:16:55] [INFO ] [Real]Absence check using state equation in 2 ms returned sat
[2024-05-31 08:16:55] [INFO ] Solution in real domain found non-integer solution.
[2024-05-31 08:16:55] [INFO ] [Nat]Absence check using 4 positive place invariants in 2 ms returned sat
[2024-05-31 08:16:55] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2024-05-31 08:16:55] [INFO ] [Nat]Absence check using state equation in 3 ms returned sat
[2024-05-31 08:16:55] [INFO ] Computed and/alt/rep : 0/0/0 causal constraints (skipped 0 transitions) in 0 ms.
[2024-05-31 08:16:55] [INFO ] Added : 0 causal constraints over 0 iterations in 2 ms. Result :sat
Minimization took 1 ms.
Current structural bounds on expressions (after SMT) : [81, 81, 81, 81]
Domain [N(9), N(9)] of place Rows breaks symmetries in sort N
[2024-05-31 08:16:55] [INFO ] Unfolded HLPN to a Petri net with 1053 places and 729 transitions 3645 arcs in 52 ms.
[2024-05-31 08:16:55] [INFO ] Unfolded 4 HLPN properties in 1 ms.
Incomplete random walk after 10000 steps, including 150 resets, run finished after 1067 ms. (steps per millisecond=9 ) properties (out of 4) seen :280
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 177 ms. (steps per millisecond=56 ) properties (out of 4) seen :20
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 187 ms. (steps per millisecond=53 ) properties (out of 4) seen :20
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 181 ms. (steps per millisecond=55 ) properties (out of 4) seen :20
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 182 ms. (steps per millisecond=54 ) properties (out of 4) seen :20
// Phase 1: matrix 729 rows 1053 cols
[2024-05-31 08:16:57] [INFO ] Computed 324 invariants in 25 ms
[2024-05-31 08:16:57] [INFO ] [Real]Absence check using 324 positive place invariants in 112 ms returned sat
[2024-05-31 08:16:57] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2024-05-31 08:16:58] [INFO ] [Real]Absence check using state equation in 311 ms returned sat
[2024-05-31 08:16:58] [INFO ] Solution in real domain found non-integer solution.
[2024-05-31 08:16:58] [INFO ] [Nat]Absence check using 324 positive place invariants in 96 ms returned sat
[2024-05-31 08:16:58] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2024-05-31 08:16:58] [INFO ] [Nat]Absence check using state equation in 296 ms returned sat
[2024-05-31 08:16:58] [INFO ] Computed and/alt/rep : 0/0/0 causal constraints (skipped 0 transitions) in 30 ms.
[2024-05-31 08:16:58] [INFO ] Added : 0 causal constraints over 0 iterations in 108 ms. Result :sat
Minimization took 109 ms.
[2024-05-31 08:16:59] [INFO ] [Real]Absence check using 324 positive place invariants in 98 ms returned sat
[2024-05-31 08:16:59] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2024-05-31 08:16:59] [INFO ] [Real]Absence check using state equation in 271 ms returned sat
[2024-05-31 08:16:59] [INFO ] Solution in real domain found non-integer solution.
[2024-05-31 08:16:59] [INFO ] [Nat]Absence check using 324 positive place invariants in 96 ms returned sat
[2024-05-31 08:16:59] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2024-05-31 08:16:59] [INFO ] [Nat]Absence check using state equation in 296 ms returned sat
[2024-05-31 08:16:59] [INFO ] Computed and/alt/rep : 0/0/0 causal constraints (skipped 0 transitions) in 28 ms.
[2024-05-31 08:17:00] [INFO ] Added : 0 causal constraints over 0 iterations in 97 ms. Result :sat
Minimization took 95 ms.
[2024-05-31 08:17:00] [INFO ] [Real]Absence check using 324 positive place invariants in 103 ms returned sat
[2024-05-31 08:17:00] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2024-05-31 08:17:00] [INFO ] [Real]Absence check using state equation in 299 ms returned sat
[2024-05-31 08:17:00] [INFO ] Solution in real domain found non-integer solution.
[2024-05-31 08:17:00] [INFO ] [Nat]Absence check using 324 positive place invariants in 103 ms returned sat
[2024-05-31 08:17:00] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2024-05-31 08:17:01] [INFO ] [Nat]Absence check using state equation in 292 ms returned sat
[2024-05-31 08:17:01] [INFO ] Computed and/alt/rep : 0/0/0 causal constraints (skipped 0 transitions) in 27 ms.
[2024-05-31 08:17:01] [INFO ] Added : 0 causal constraints over 0 iterations in 106 ms. Result :sat
Minimization took 100 ms.
[2024-05-31 08:17:01] [INFO ] [Real]Absence check using 324 positive place invariants in 105 ms returned sat
[2024-05-31 08:17:01] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2024-05-31 08:17:02] [INFO ] [Real]Absence check using state equation in 302 ms returned sat
[2024-05-31 08:17:02] [INFO ] Solution in real domain found non-integer solution.
[2024-05-31 08:17:02] [INFO ] [Nat]Absence check using 324 positive place invariants in 96 ms returned sat
[2024-05-31 08:17:02] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2024-05-31 08:17:02] [INFO ] [Nat]Absence check using state equation in 308 ms returned sat
[2024-05-31 08:17:02] [INFO ] Computed and/alt/rep : 0/0/0 causal constraints (skipped 0 transitions) in 30 ms.
[2024-05-31 08:17:02] [INFO ] Added : 0 causal constraints over 0 iterations in 102 ms. Result :sat
Minimization took 104 ms.
Current structural bounds on expressions (after SMT) : [81, 81, 81, 81] Max seen :[70, 70, 70, 70]
FORMULA Sudoku-COL-BN09-UpperBounds-15 81 TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA Sudoku-COL-BN09-UpperBounds-14 81 TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA Sudoku-COL-BN09-UpperBounds-13 81 TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA Sudoku-COL-BN09-UpperBounds-12 81 TECHNIQUES TOPOLOGICAL PARIKH_WALK
All properties solved without resorting to model-checking.
Total runtime 9096 ms.

BK_STOP 1717143424315

--------------------
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
+ [[ UpperBounds = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution UpperBounds -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_1.0.0.202304061127.jar
+ VERSION=202304061127
+ echo 'Running Version 202304061127'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination UpperBounds -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="Sudoku-COL-BN09"
export BK_EXAMINATION="UpperBounds"
export BK_TOOL="gold2023"
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 gold2023"
echo " Input is Sudoku-COL-BN09, examination is UpperBounds"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r417-tall-171690556300346"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/Sudoku-COL-BN09.tgz
mv Sudoku-COL-BN09 execution
cd execution
if [ "UpperBounds" = "ReachabilityDeadlock" ] || [ "UpperBounds" = "UpperBounds" ] || [ "UpperBounds" = "QuasiLiveness" ] || [ "UpperBounds" = "StableMarking" ] || [ "UpperBounds" = "Liveness" ] || [ "UpperBounds" = "OneSafe" ] || [ "UpperBounds" = "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 [ "UpperBounds" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "UpperBounds" != "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 "UpperBounds.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property UpperBounds.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "UpperBounds.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 '' UpperBounds.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "UpperBounds" = "ReachabilityDeadlock" ] || [ "UpperBounds" = "QuasiLiveness" ] || [ "UpperBounds" = "StableMarking" ] || [ "UpperBounds" = "Liveness" ] || [ "UpperBounds" = "OneSafe" ] ; then
echo "FORMULA_NAME UpperBounds"
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 ;