fond
Model Checking Contest 2021
11th edition, Paris, France, June 23, 2021
Execution of r007-tall-162037990100531
Last Updated
Jun 28, 2021

About the Execution of ITS-Tools for BART-COL-002

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
263.560 5282.00 11288.00 235.50 TFTFTFTFTFFTTFTF normal

Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2021-input.r007-tall-162037990100531.qcow2', fmt=qcow2 size=4294967296 backing_file='/data/fkordon/mcc2021-input.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off
Waiting for the VM to be ready (probing ssh)
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=====================================================================
Generated by BenchKit 2-4028
Executing tool itstools
Input is BART-COL-002, examination is CTLCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r007-tall-162037990100531
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 484K
-rw-r--r-- 1 mcc users 12K May 5 16:58 CTLCardinality.txt
-rw-r--r-- 1 mcc users 95K May 10 09:42 CTLCardinality.xml
-rw-r--r-- 1 mcc users 7.1K May 5 16:58 CTLFireability.txt
-rw-r--r-- 1 mcc users 52K May 10 09:42 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 6 14:48 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.4K May 6 14:48 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 3.4K Mar 28 15:45 LTLCardinality.txt
-rw-r--r-- 1 mcc users 22K Mar 28 15:45 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Mar 28 15:45 LTLFireability.txt
-rw-r--r-- 1 mcc users 19K Mar 28 15:45 LTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Mar 23 02:08 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 20K Mar 23 02:07 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 2.3K Mar 22 10:36 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 11K Mar 22 10:36 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Mar 22 09:09 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Mar 22 09:09 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 May 5 16:51 equiv_pt
-rw-r--r-- 1 mcc users 4 May 5 16:51 instance
-rw-r--r-- 1 mcc users 5 May 5 16:51 iscolored
-rw-r--r-- 1 mcc users 184K May 5 16:51 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 BART-COL-002-CTLCardinality-00
FORMULA_NAME BART-COL-002-CTLCardinality-01
FORMULA_NAME BART-COL-002-CTLCardinality-02
FORMULA_NAME BART-COL-002-CTLCardinality-03
FORMULA_NAME BART-COL-002-CTLCardinality-04
FORMULA_NAME BART-COL-002-CTLCardinality-05
FORMULA_NAME BART-COL-002-CTLCardinality-06
FORMULA_NAME BART-COL-002-CTLCardinality-07
FORMULA_NAME BART-COL-002-CTLCardinality-08
FORMULA_NAME BART-COL-002-CTLCardinality-09
FORMULA_NAME BART-COL-002-CTLCardinality-10
FORMULA_NAME BART-COL-002-CTLCardinality-11
FORMULA_NAME BART-COL-002-CTLCardinality-12
FORMULA_NAME BART-COL-002-CTLCardinality-13
FORMULA_NAME BART-COL-002-CTLCardinality-14
FORMULA_NAME BART-COL-002-CTLCardinality-15

=== Now, execution of the tool begins

BK_START 1620758649195

Running Version 0
[2021-05-11 18:44:10] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, CTLCardinality, -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]
[2021-05-11 18:44:10] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2021-05-11 18:44:10] [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.
[2021-05-11 18:44:11] [WARNING] Using fallBack plugin, rng conformance not checked
[2021-05-11 18:44:11] [INFO ] Load time of PNML (colored model parsed with PNMLFW) : 685 ms
[2021-05-11 18:44:11] [INFO ] Detected 3 constant HL places corresponding to 10373 PT places.
[2021-05-11 18:44:11] [INFO ] Imported 4 HL places and 7 HL transitions for a total of 10865 PT places and 2.814459024E9 transition bindings in 60 ms.
Parsed 16 properties from file /home/mcc/execution/CTLCardinality.xml in 17 ms.
[2021-05-11 18:44:11] [INFO ] Built PT skeleton of HLPN with 4 places and 7 transitions in 4 ms.
[2021-05-11 18:44:11] [INFO ] Skeletonized HLPN properties in 15 ms.
Successfully produced net in file /tmp/petri1000_16877551029946103999.dot
[2021-05-11 18:44:11] [INFO ] Initial state test concluded for 1 properties.
Reduce places removed 3 places and 0 transitions.
Ensure Unique test removed 5 transitions
Reduce redundant transitions removed 5 transitions.
FORMULA BART-COL-002-CTLCardinality-03 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Incomplete random walk after 100001 steps, including 25118 resets, run finished after 465 ms. (steps per millisecond=215 ) properties (out of 53) seen :2
Running SMT prover for 51 properties.
// Phase 1: matrix 2 rows 1 cols
[2021-05-11 18:44:12] [INFO ] Computed 0 place invariants in 4 ms
[2021-05-11 18:44:12] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2021-05-11 18:44:12] [INFO ] SMT Verify possible in real domain returnedunsat :51 sat :0 real:0
Successfully simplified 51 atomic propositions for a total of 14 simplifications.
FORMULA BART-COL-002-CTLCardinality-08 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BART-COL-002-CTLCardinality-12 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2021-05-11 18:44:12] [INFO ] Initial state reduction rules for CTL removed 4 formulas.
[2021-05-11 18:44:12] [INFO ] Flatten gal took : 14 ms
[2021-05-11 18:44:12] [INFO ] Initial state reduction rules for CTL removed 2 formulas.
FORMULA BART-COL-002-CTLCardinality-15 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BART-COL-002-CTLCardinality-14 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BART-COL-002-CTLCardinality-11 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BART-COL-002-CTLCardinality-10 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BART-COL-002-CTLCardinality-07 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BART-COL-002-CTLCardinality-00 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2021-05-11 18:44:12] [INFO ] Flatten gal took : 1 ms
[2021-05-11 18:44:12] [INFO ] Unfolded HLPN to a Petri net with 10865 places and 646 transitions in 205 ms.
[2021-05-11 18:44:12] [INFO ] Unfolded HLPN properties in 6 ms.
Successfully produced net in file /tmp/petri1001_15230096458328641910.dot
Deduced a syphon composed of 10329 places in 3 ms
Reduce places removed 10601 places and 242 transitions.
Support contains 0 out of 264 places. Attempting structural reductions.
Starting structural reductions, iteration 0 : 264/264 places, 404/404 transitions.
Discarding 64 places :
Symmetric choice reduction at 0 with 64 rule applications. Total rules 64 place count 200 transition count 340
Iterating global reduction 0 with 64 rules applied. Total rules applied 128 place count 200 transition count 340
Discarding 54 places :
Symmetric choice reduction at 0 with 54 rule applications. Total rules 182 place count 146 transition count 286
Iterating global reduction 0 with 54 rules applied. Total rules applied 236 place count 146 transition count 286
Discarding 8 places :
Symmetric choice reduction at 0 with 8 rule applications. Total rules 244 place count 138 transition count 278
Iterating global reduction 0 with 8 rules applied. Total rules applied 252 place count 138 transition count 278
Discarding 6 places :
Symmetric choice reduction at 0 with 6 rule applications. Total rules 258 place count 132 transition count 272
Iterating global reduction 0 with 6 rules applied. Total rules applied 264 place count 132 transition count 272
Discarding 6 places :
Symmetric choice reduction at 0 with 6 rule applications. Total rules 270 place count 126 transition count 266
Iterating global reduction 0 with 6 rules applied. Total rules applied 276 place count 126 transition count 266
Discarding 6 places :
Symmetric choice reduction at 0 with 6 rule applications. Total rules 282 place count 120 transition count 260
Iterating global reduction 0 with 6 rules applied. Total rules applied 288 place count 120 transition count 260
Discarding 6 places :
Symmetric choice reduction at 0 with 6 rule applications. Total rules 294 place count 114 transition count 254
Iterating global reduction 0 with 6 rules applied. Total rules applied 300 place count 114 transition count 254
Discarding 6 places :
Symmetric choice reduction at 0 with 6 rule applications. Total rules 306 place count 108 transition count 248
Iterating global reduction 0 with 6 rules applied. Total rules applied 312 place count 108 transition count 248
Discarding 4 places :
Symmetric choice reduction at 0 with 4 rule applications. Total rules 316 place count 104 transition count 244
Iterating global reduction 0 with 4 rules applied. Total rules applied 320 place count 104 transition count 244
Discarding 4 places :
Symmetric choice reduction at 0 with 4 rule applications. Total rules 324 place count 100 transition count 240
Iterating global reduction 0 with 4 rules applied. Total rules applied 328 place count 100 transition count 240
Discarding 2 places :
Symmetric choice reduction at 0 with 2 rule applications. Total rules 330 place count 98 transition count 238
Iterating global reduction 0 with 2 rules applied. Total rules applied 332 place count 98 transition count 238
Applied a total of 332 rules in 65 ms. Remains 98 /264 variables (removed 166) and now considering 238/404 (removed 166) transitions.
// Phase 1: matrix 238 rows 98 cols
[2021-05-11 18:44:12] [INFO ] Computed 2 place invariants in 13 ms
[2021-05-11 18:44:12] [INFO ] Implicit Places using invariants in 39 ms returned []
// Phase 1: matrix 238 rows 98 cols
[2021-05-11 18:44:12] [INFO ] Computed 2 place invariants in 6 ms
[2021-05-11 18:44:13] [INFO ] Implicit Places using invariants and state equation in 67 ms returned []
Implicit Place search using SMT with State Equation took 108 ms to find 0 implicit places.
// Phase 1: matrix 238 rows 98 cols
[2021-05-11 18:44:13] [INFO ] Computed 2 place invariants in 2 ms
[2021-05-11 18:44:13] [INFO ] Dead Transitions using invariants and state equation in 123 ms returned []
Finished structural reductions, in 1 iterations. Remains : 98/264 places, 238/404 transitions.
[2021-05-11 18:44:13] [INFO ] Flatten gal took : 31 ms
[2021-05-11 18:44:13] [INFO ] Flatten gal took : 16 ms
[2021-05-11 18:44:13] [INFO ] Input system was already deterministic with 238 transitions.
FORMULA BART-COL-002-CTLCardinality-04 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Finished random walk after 0 steps, including 0 resets, run visited all 0 properties in 1 ms. (steps per millisecond=0 )
[2021-05-11 18:44:13] [INFO ] Flatten gal took : 12 ms
[2021-05-11 18:44:13] [INFO ] Flatten gal took : 12 ms
[2021-05-11 18:44:13] [INFO ] Applying decomposition
[2021-05-11 18:44:13] [INFO ] Flatten gal took : 12 ms
Converted graph to binary with : CommandLine [args=[/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.louvain.binaries_1.0.0.202104292328/bin/convert-linux64, -i, /tmp/graph14550950069502501482.txt, -o, /tmp/graph14550950069502501482.bin, -w, /tmp/graph14550950069502501482.weights], workingDir=null]
Built communities with : CommandLine [args=[/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.louvain.binaries_1.0.0.202104292328/bin/louvain-linux64, /tmp/graph14550950069502501482.bin, -l, -1, -v, -w, /tmp/graph14550950069502501482.weights, -q, 0, -e, 0.001], workingDir=null]
[2021-05-11 18:44:13] [INFO ] Decomposing Gal with order
[2021-05-11 18:44:13] [INFO ] Rewriting arrays to variables to allow decomposition.
[2021-05-11 18:44:13] [INFO ] Removed a total of 77 redundant transitions.
[2021-05-11 18:44:13] [INFO ] Flatten gal took : 33 ms
[2021-05-11 18:44:13] [INFO ] Fuse similar labels procedure discarded/fused a total of 85 labels/synchronizations in 6 ms.
[2021-05-11 18:44:13] [INFO ] Time to serialize gal into /tmp/CTLCardinality11479356526172552164.gal : 4 ms
[2021-05-11 18:44:13] [INFO ] Time to serialize properties into /tmp/CTLCardinality42258920021429614.ctl : 1 ms
Invoking ITS tools like this :CommandLine [args=[/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202104292328/bin/its-ctl-linux64, --gc-threshold, 2000000, --quiet, -i, /tmp/CTLCardinality11479356526172552164.gal, -t, CGAL, -ctl, /tmp/CTLCardinality42258920021429614.ctl], workingDir=/home/mcc/execution]

its-ctl command run as :

/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202104292328/bin/its-ctl-linux64 --gc-threshold 2000000 --quiet -i /tmp/CTLCardinality11479356526172552164.gal -t CGAL -ctl /tmp/CTLCardinality42258920021429614.ctl
No direction supplied, using forward translation only.
Parsed 6 CTL formulae.
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
reachable,2401,0.026199,5312,59,15,638,383,225,696,73,733,0


Converting to forward existential form...Done !
original formula: AX(FALSE)
=> equivalent forward existential formula: [(EY(Init) * !(FALSE))] = FALSE
(forward)formula 0,0,0.027082,5312,1,0,638,383,300,696,91,733,284
FORMULA BART-COL-002-CTLCardinality-01 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is FALSE !

***************************************

original formula: EF(!(AX(FALSE)))
=> equivalent forward existential formula: [(EY(FwdU(Init,TRUE)) * !(FALSE))] != FALSE
(forward)formula 1,1,0.028716,5312,1,0,638,383,300,696,101,733,743
FORMULA BART-COL-002-CTLCardinality-02 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is TRUE !

***************************************

original formula: AF(EX(AX(FALSE)))
=> equivalent forward existential formula: [FwdG(Init,!(EX(!(EX(!(FALSE))))))] = FALSE
Reverse transition relation is exact ! Faster fixpoint algorithm enabled.
Using saturation style SCC detection
Using saturation style SCC detection
Using saturation style SCC detection
Using saturation style SCC detection
Fast SCC detection found an SCC at level 2
Fast SCC detection found an SCC at level 3
Fast SCC detection found an SCC at level 4
Fast SCC detection found an SCC at level 5
(forward)formula 2,0,0.045058,5312,1,0,1268,536,840,1486,288,1089,3419
FORMULA BART-COL-002-CTLCardinality-05 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is FALSE !

***************************************

original formula: EX(TRUE)
=> equivalent forward existential formula: [(EY(Init) * TRUE)] != FALSE
(forward)formula 3,1,0.045108,5312,1,0,1268,536,840,1486,288,1089,3419
FORMULA BART-COL-002-CTLCardinality-06 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is TRUE !

***************************************

original formula: EF(AX(FALSE))
=> equivalent forward existential formula: [(FwdU(Init,TRUE) * !(EX(!(FALSE))))] != FALSE
(forward)formula 4,0,0.045136,5312,1,0,1268,536,840,1486,288,1089,3419
FORMULA BART-COL-002-CTLCardinality-09 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is FALSE !

***************************************

original formula: AX(EF(AX(FALSE)))
=> equivalent forward existential formula: [(EY(Init) * !(E(TRUE U !(EX(!(FALSE))))))] = FALSE
(forward)formula 5,0,0.045736,5312,1,0,1268,536,885,1486,295,1089,3419
FORMULA BART-COL-002-CTLCardinality-13 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is FALSE !

***************************************


BK_STOP 1620758654477

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

+ export BINDIR=/home/mcc/BenchKit/bin//../
+ BINDIR=/home/mcc/BenchKit/bin//../
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ CTLCardinality = StateSpace ]]
+ /home/mcc/BenchKit/bin//..//runeclipse.sh /home/mcc/execution CTLCardinality -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 CTLCardinality -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="BART-COL-002"
export BK_EXAMINATION="CTLCardinality"
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 2-4028"
echo " Executing tool itstools"
echo " Input is BART-COL-002, examination is CTLCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r007-tall-162037990100531"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/BART-COL-002.tgz
mv BART-COL-002 execution
cd execution
if [ "CTLCardinality" = "ReachabilityDeadlock" ] || [ "CTLCardinality" = "UpperBounds" ] || [ "CTLCardinality" = "QuasiLiveness" ] || [ "CTLCardinality" = "StableMarking" ] || [ "CTLCardinality" = "Liveness" ] || [ "CTLCardinality" = "OneSafe" ] || [ "CTLCardinality" = "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 [ "CTLCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "CTLCardinality" != "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 "CTLCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property CTLCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "CTLCardinality.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 '' CTLCardinality.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "CTLCardinality" = "ReachabilityDeadlock" ] || [ "CTLCardinality" = "QuasiLiveness" ] || [ "CTLCardinality" = "StableMarking" ] || [ "CTLCardinality" = "Liveness" ] || [ "CTLCardinality" = "OneSafe" ] ; then
echo "FORMULA_NAME CTLCardinality"
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 ;