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.r150-smll-165276998700318.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 Parking-PT-416, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r150-smll-165276998700318
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 588K
-rw-r--r-- 1 mcc users 5.8K Apr 30 06:02 CTLCardinality.txt
-rw-r--r-- 1 mcc users 58K Apr 30 06:02 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.3K Apr 30 05:56 CTLFireability.txt
-rw-r--r-- 1 mcc users 46K Apr 30 05:56 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 10 09:34 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.5K May 10 09:34 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 3.6K May 9 08:23 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K May 9 08:23 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K May 9 08:23 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K May 9 08:23 LTLFireability.xml
-rw-r--r-- 1 mcc users 13K Apr 30 06:14 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 148K Apr 30 06:14 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 9.4K Apr 30 06:07 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 85K Apr 30 06:07 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K May 9 08:23 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K May 9 08:23 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 10 09:34 equiv_col
-rw-r--r-- 1 mcc users 4 May 10 09:34 instance
-rw-r--r-- 1 mcc users 6 May 10 09:34 iscolored
-rw-r--r-- 1 mcc users 107K 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

here is the order used to build the result vector(from text file)
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-00
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-01
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-02
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-03
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-04
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-05
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-06
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-07
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-08
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-09
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-10
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-11
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-12
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-13
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-14
FORMULA_NAME Parking-PT-416-ReachabilityCardinality-15

=== Now, execution of the tool begins

BK_START 1654249763508

Running Version 202205111006
[2022-06-03 09:49:26] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -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]
[2022-06-03 09:49:26] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2022-06-03 09:49:26] [INFO ] Load time of PNML (sax parser for PT used): 252 ms
[2022-06-03 09:49:26] [INFO ] Transformed 305 places.
[2022-06-03 09:49:26] [INFO ] Transformed 433 transitions.
[2022-06-03 09:49:26] [INFO ] Found NUPN structural information;
[2022-06-03 09:49:26] [INFO ] Parsed PT model containing 305 places and 433 transitions in 506 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 43 ms.
Working with output stream class java.io.PrintStream
Ensure Unique test removed 176 transitions
Reduce redundant transitions removed 176 transitions.
FORMULA Parking-PT-416-ReachabilityCardinality-04 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Parking-PT-416-ReachabilityCardinality-10 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Incomplete random walk after 10000 steps, including 129 resets, run finished after 950 ms. (steps per millisecond=10 ) properties (out of 14) seen :5
FORMULA Parking-PT-416-ReachabilityCardinality-15 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Parking-PT-416-ReachabilityCardinality-14 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Parking-PT-416-ReachabilityCardinality-06 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Parking-PT-416-ReachabilityCardinality-03 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Parking-PT-416-ReachabilityCardinality-00 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Incomplete Best-First random walk after 10001 steps, including 5 resets, run finished after 40 ms. (steps per millisecond=250 ) properties (out of 9) seen :0
Incomplete Best-First random walk after 10001 steps, including 5 resets, run finished after 86 ms. (steps per millisecond=116 ) properties (out of 9) seen :0
Incomplete Best-First random walk after 10001 steps, including 5 resets, run finished after 63 ms. (steps per millisecond=158 ) properties (out of 9) seen :0
Incomplete Best-First random walk after 10001 steps, including 5 resets, run finished after 49 ms. (steps per millisecond=204 ) properties (out of 9) seen :0
Incomplete Best-First random walk after 10001 steps, including 5 resets, run finished after 39 ms. (steps per millisecond=256 ) properties (out of 9) seen :0
Incomplete Best-First random walk after 10001 steps, including 5 resets, run finished after 36 ms. (steps per millisecond=277 ) properties (out of 9) seen :0
Incomplete Best-First random walk after 10001 steps, including 5 resets, run finished after 65 ms. (steps per millisecond=153 ) properties (out of 9) seen :0
Incomplete Best-First random walk after 10001 steps, including 5 resets, run finished after 88 ms. (steps per millisecond=113 ) properties (out of 9) seen :0
Incomplete Best-First random walk after 10001 steps, including 5 resets, run finished after 32 ms. (steps per millisecond=312 ) properties (out of 9) seen :0
Running SMT prover for 9 properties.
// Phase 1: matrix 257 rows 305 cols
[2022-06-03 09:49:28] [INFO ] Computed 76 place invariants in 34 ms
[2022-06-03 09:49:28] [INFO ] After 454ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:9
[2022-06-03 09:49:29] [INFO ] [Nat]Absence check using 72 positive place invariants in 31 ms returned sat
[2022-06-03 09:49:29] [INFO ] [Nat]Absence check using 72 positive and 4 generalized place invariants in 4 ms returned sat
[2022-06-03 09:49:29] [INFO ] After 331ms SMT Verify possible using state equation in natural domain returned unsat :7 sat :2
[2022-06-03 09:49:29] [INFO ] State equation strengthened by 60 read => feed constraints.
[2022-06-03 09:49:29] [INFO ] After 190ms SMT Verify possible using 60 Read/Feed constraints in natural domain returned unsat :7 sat :2
[2022-06-03 09:49:29] [INFO ] After 346ms SMT Verify possible using trap constraints in natural domain returned unsat :7 sat :2
Attempting to minimize the solution found.
Minimization took 159 ms.
[2022-06-03 09:49:29] [INFO ] After 1105ms SMT Verify possible using all constraints in natural domain returned unsat :7 sat :2
FORMULA Parking-PT-416-ReachabilityCardinality-13 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA Parking-PT-416-ReachabilityCardinality-09 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA Parking-PT-416-ReachabilityCardinality-08 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA Parking-PT-416-ReachabilityCardinality-07 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA Parking-PT-416-ReachabilityCardinality-05 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA Parking-PT-416-ReachabilityCardinality-02 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA Parking-PT-416-ReachabilityCardinality-01 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
Fused 9 Parikh solutions to 2 different solutions.
Parikh walk visited 0 properties in 517 ms.
Support contains 58 out of 305 places. Attempting structural reductions.
Starting structural reductions in SAFETY mode, iteration 0 : 305/305 places, 257/257 transitions.
Drop transitions removed 4 transitions
Trivial Post-agglo rules discarded 4 transitions
Performed 4 trivial Post agglomeration. Transition count delta: 4
Iterating post reduction 0 with 4 rules applied. Total rules applied 4 place count 305 transition count 253
Reduce places removed 4 places and 0 transitions.
Performed 1 Post agglomeration using F-continuation condition.Transition count delta: 1
Iterating post reduction 1 with 5 rules applied. Total rules applied 9 place count 301 transition count 252
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 2 with 1 rules applied. Total rules applied 10 place count 300 transition count 252
Performed 6 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 3 with 6 Pre rules applied. Total rules applied 10 place count 300 transition count 246
Deduced a syphon composed of 6 places in 1 ms
Reduce places removed 6 places and 0 transitions.
Iterating global reduction 3 with 12 rules applied. Total rules applied 22 place count 294 transition count 246
Discarding 3 places :
Symmetric choice reduction at 3 with 3 rule applications. Total rules 25 place count 291 transition count 243
Iterating global reduction 3 with 3 rules applied. Total rules applied 28 place count 291 transition count 243
Performed 8 Post agglomeration using F-continuation condition.Transition count delta: 8
Deduced a syphon composed of 8 places in 1 ms
Reduce places removed 8 places and 0 transitions.
Iterating global reduction 3 with 16 rules applied. Total rules applied 44 place count 283 transition count 235
Free-agglomeration rule applied 39 times.
Iterating global reduction 3 with 39 rules applied. Total rules applied 83 place count 283 transition count 196
Reduce places removed 39 places and 0 transitions.
Iterating post reduction 3 with 39 rules applied. Total rules applied 122 place count 244 transition count 196
Partial Free-agglomeration rule applied 1 times.
Drop transitions removed 1 transitions
Iterating global reduction 4 with 1 rules applied. Total rules applied 123 place count 244 transition count 196
Applied a total of 123 rules in 209 ms. Remains 244 /305 variables (removed 61) and now considering 196/257 (removed 61) transitions.
Finished structural reductions, in 1 iterations. Remains : 244/305 places, 196/257 transitions.
Incomplete random walk after 1000000 steps, including 2 resets, run finished after 13613 ms. (steps per millisecond=73 ) properties (out of 2) seen :0
Interrupted Best-First random walk after 955344 steps, including 2 resets, run timeout after 5001 ms. (steps per millisecond=191 ) properties seen 0
Interrupted Best-First random walk after 572616 steps, including 1 resets, run timeout after 5001 ms. (steps per millisecond=114 ) properties seen 0
Interrupted probabilistic random walk after 12940819 steps, run timeout after 69001 ms. (steps per millisecond=187 ) properties seen :{}
Probabilistic random walk after 12940819 steps, saw 1822048 distinct states, run finished after 69006 ms. (steps per millisecond=187 ) properties seen :0
Running SMT prover for 2 properties.
// Phase 1: matrix 196 rows 244 cols
[2022-06-03 09:51:03] [INFO ] Computed 76 place invariants in 5 ms
[2022-06-03 09:51:03] [INFO ] After 86ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:2
[2022-06-03 09:51:03] [INFO ] [Nat]Absence check using 72 positive place invariants in 21 ms returned sat
[2022-06-03 09:51:03] [INFO ] [Nat]Absence check using 72 positive and 4 generalized place invariants in 3 ms returned sat
[2022-06-03 09:51:03] [INFO ] After 201ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :2
[2022-06-03 09:51:03] [INFO ] State equation strengthened by 120 read => feed constraints.
[2022-06-03 09:51:03] [INFO ] After 108ms SMT Verify possible using 120 Read/Feed constraints in natural domain returned unsat :0 sat :2
[2022-06-03 09:51:03] [INFO ] After 218ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :2
Attempting to minimize the solution found.
Minimization took 98 ms.
[2022-06-03 09:51:04] [INFO ] After 649ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :2
FORMULA Parking-PT-416-ReachabilityCardinality-11 TRUE TECHNIQUES TOPOLOGICAL PARIKH_WALK
Parikh walk visited 1 properties in 48 ms.
Support contains 46 out of 244 places. Attempting structural reductions.
Starting structural reductions in SAFETY mode, iteration 0 : 244/244 places, 196/196 transitions.
Performed 2 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 0 with 2 Pre rules applied. Total rules applied 0 place count 244 transition count 194
Deduced a syphon composed of 2 places in 0 ms
Reduce places removed 2 places and 0 transitions.
Iterating global reduction 0 with 4 rules applied. Total rules applied 4 place count 242 transition count 194
Free-agglomeration rule applied 2 times.
Iterating global reduction 0 with 2 rules applied. Total rules applied 6 place count 242 transition count 192
Reduce places removed 2 places and 0 transitions.
Iterating post reduction 0 with 2 rules applied. Total rules applied 8 place count 240 transition count 192
Drop transitions removed 1 transitions
Redundant transition composition rules discarded 1 transitions
Iterating global reduction 1 with 1 rules applied. Total rules applied 9 place count 240 transition count 191
Applied a total of 9 rules in 38 ms. Remains 240 /244 variables (removed 4) and now considering 191/196 (removed 5) transitions.
Finished structural reductions, in 1 iterations. Remains : 240/244 places, 191/196 transitions.
Incomplete random walk after 1000000 steps, including 2 resets, run finished after 2633 ms. (steps per millisecond=379 ) properties (out of 1) seen :0
Incomplete Best-First random walk after 1000001 steps, including 2 resets, run finished after 3187 ms. (steps per millisecond=313 ) properties (out of 1) seen :0
Interrupted probabilistic random walk after 3910267 steps, run timeout after 15001 ms. (steps per millisecond=260 ) properties seen :{}
Probabilistic random walk after 3910267 steps, saw 596987 distinct states, run finished after 15001 ms. (steps per millisecond=260 ) properties seen :0
Running SMT prover for 1 properties.
// Phase 1: matrix 191 rows 240 cols
[2022-06-03 09:51:24] [INFO ] Computed 76 place invariants in 9 ms
[2022-06-03 09:51:25] [INFO ] After 62ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:1
[2022-06-03 09:51:25] [INFO ] [Nat]Absence check using 72 positive place invariants in 31 ms returned sat
[2022-06-03 09:51:25] [INFO ] [Nat]Absence check using 72 positive and 4 generalized place invariants in 3 ms returned sat
[2022-06-03 09:51:25] [INFO ] After 181ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :1
[2022-06-03 09:51:25] [INFO ] State equation strengthened by 120 read => feed constraints.
[2022-06-03 09:51:25] [INFO ] After 77ms SMT Verify possible using 120 Read/Feed constraints in natural domain returned unsat :0 sat :1
[2022-06-03 09:51:25] [INFO ] After 181ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :1
Attempting to minimize the solution found.
Minimization took 152 ms.
[2022-06-03 09:51:25] [INFO ] After 625ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :1
Finished Parikh walk after 70 steps, including 0 resets, run visited all 1 properties in 3 ms. (steps per millisecond=23 )
FORMULA Parking-PT-416-ReachabilityCardinality-12 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
Parikh walk visited 1 properties in 3 ms.
All properties solved without resorting to model-checking.
Total runtime 119623 ms.

BK_STOP 1654249885772

--------------------
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
+ [[ ReachabilityCardinality = StateSpace ]]
+ /home/mcc/BenchKit/bin//..//runeclipse.sh /home/mcc/execution ReachabilityCardinality -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600
+ 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 ReachabilityCardinality -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=@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="Parking-PT-416"
export BK_EXAMINATION="ReachabilityCardinality"
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 Parking-PT-416, examination is ReachabilityCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r150-smll-165276998700318"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/Parking-PT-416.tgz
mv Parking-PT-416 execution
cd execution
if [ "ReachabilityCardinality" = "ReachabilityDeadlock" ] || [ "ReachabilityCardinality" = "UpperBounds" ] || [ "ReachabilityCardinality" = "QuasiLiveness" ] || [ "ReachabilityCardinality" = "StableMarking" ] || [ "ReachabilityCardinality" = "Liveness" ] || [ "ReachabilityCardinality" = "OneSafe" ] || [ "ReachabilityCardinality" = "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 [ "ReachabilityCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityCardinality" != "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 "ReachabilityCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property ReachabilityCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "ReachabilityCardinality.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 '' ReachabilityCardinality.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "ReachabilityCardinality" = "ReachabilityDeadlock" ] || [ "ReachabilityCardinality" = "QuasiLiveness" ] || [ "ReachabilityCardinality" = "StableMarking" ] || [ "ReachabilityCardinality" = "Liveness" ] || [ "ReachabilityCardinality" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityCardinality"
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 ;