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.r536-tall-171690532900694.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 ltsminxred
Input is Sudoku-PT-AN16, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r536-tall-171690532900694
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 119M
-rw-r--r-- 1 mcc users 1.6M Apr 12 12:22 CTLCardinality.txt
-rw-r--r-- 1 mcc users 6.8M Apr 12 12:22 CTLCardinality.xml
-rw-r--r-- 1 mcc users 3.9M Apr 12 10:25 CTLFireability.txt
-rw-r--r-- 1 mcc users 18M Apr 12 10:25 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 18 16:43 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.6K May 18 16:43 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 698K Apr 23 08:01 LTLCardinality.txt
-rw-r--r-- 1 mcc users 2.1M Apr 23 08:01 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.1M Apr 23 08:01 LTLFireability.txt
-rw-r--r-- 1 mcc users 7.2M Apr 23 08:01 LTLFireability.xml
-rw-r--r-- 1 mcc users 4.7M Apr 12 14:52 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 22M Apr 12 14:52 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.7M Apr 12 12:38 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 40M Apr 12 12:38 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 144K Apr 23 08:01 UpperBounds.txt
-rw-r--r-- 1 mcc users 345K Apr 23 08:01 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 May 18 16:43 equiv_col
-rw-r--r-- 1 mcc users 5 May 18 16:43 instance
-rw-r--r-- 1 mcc users 6 May 18 16:43 iscolored
-rw-r--r-- 1 mcc users 2.3M 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 booleans
BOOL_VECTOR

here is the order used to build the result vector(from text file)
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-00
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-01
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-02
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-03
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-04
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-05
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-06
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-07
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-08
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-09
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-10
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-11
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-12
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-13
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-14
FORMULA_NAME Sudoku-PT-AN16-ReachabilityCardinality-2024-15

=== Now, execution of the tool begins

BK_START 1717278456764

Invoking MCC driver with
BK_TOOL=ltsminxred
BK_EXAMINATION=ReachabilityCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=Sudoku-PT-AN16
BK_MEMORY_CONFINEMENT=16384
Applying reductions before tool ltsmin
Invoking reducer
Running Version 202405141337
[2024-06-01 21:47:37] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -timeout, 360, -rebuildPNML]
[2024-06-01 21:47:37] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2024-06-01 21:47:38] [INFO ] Load time of PNML (sax parser for PT used): 267 ms
[2024-06-01 21:47:38] [INFO ] Transformed 4864 places.
[2024-06-01 21:47:38] [INFO ] Transformed 4096 transitions.
[2024-06-01 21:47:38] [INFO ] Found NUPN structural information;
[2024-06-01 21:47:38] [INFO ] Parsed PT model containing 4864 places and 4096 transitions and 16384 arcs in 390 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 351 ms.
Working with output stream class java.io.PrintStream
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-08 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-09 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-12 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-13 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
RANDOM walk for 40000 steps (176 resets) in 13014 ms. (3 steps per ms) remains 2/12 properties
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-15 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-14 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-10 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-07 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-06 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-05 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-04 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-02 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-01 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-00 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
BEST_FIRST walk for 40004 steps (8 resets) in 1184 ms. (33 steps per ms) remains 2/2 properties
BEST_FIRST walk for 40004 steps (8 resets) in 1416 ms. (28 steps per ms) remains 2/2 properties
// Phase 1: matrix 4096 rows 4864 cols
[2024-06-01 21:47:43] [INFO ] Computed 768 invariants in 54 ms
All remaining problems are real, not stopping.
At refinement iteration 0 (INCLUDED_ONLY) 0/276 variables, 276/276 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/276 variables, 0/276 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 2 (OVERLAPS) 4113/4389 variables, 293/569 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/4389 variables, 4113/4682 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/4389 variables, 0/4682 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 5 (OVERLAPS) 475/4864 variables, 475/5157 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/4864 variables, 475/5632 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/4864 variables, 0/5632 constraints. Problems are: Problem set: 0 solved, 2 unsolved
Solver is answering 'unknown', stopping.
After SMT solving in domain Real declared 8960/8960 variables, and 10496 constraints, problems are : Problem set: 0 solved, 2 unsolved in 5042 ms.
Refiners :[Domain max(s): 4864/4864 constraints, Positive P Invariants (semi-flows): 768/768 constraints, State Equation: 4864/4864 constraints, PredecessorRefiner: 2/1 constraints, Known Traps: 0/0 constraints]
Escalating to Integer solving :Problem set: 0 solved, 2 unsolved
At refinement iteration 0 (INCLUDED_ONLY) 0/276 variables, 276/276 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/276 variables, 0/276 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 2 (OVERLAPS) 4113/4389 variables, 293/569 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/4389 variables, 4113/4682 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/4389 variables, 0/4682 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 5 (OVERLAPS) 475/4864 variables, 475/5157 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/4864 variables, 475/5632 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/4864 variables, 0/5632 constraints. Problems are: Problem set: 0 solved, 2 unsolved
Solver is answering 'unknown', stopping.
After SMT solving in domain Int declared 8960/8960 variables, and 10496 constraints, problems are : Problem set: 0 solved, 2 unsolved in 5006 ms.
Refiners :[Domain max(s): 4864/4864 constraints, Positive P Invariants (semi-flows): 768/768 constraints, State Equation: 4864/4864 constraints, PredecessorRefiner: 1/1 constraints, Known Traps: 0/0 constraints]
After SMT, in 10313ms problems are : Problem set: 0 solved, 2 unsolved
Skipping Parikh replay, no witness traces provided.
Support contains 276 out of 4864 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 4864/4864 places, 4096/4096 transitions.
Graph (complete) has 12288 edges and 4864 vertex of which 786 are kept as prefixes of interest. Removing 4078 places using SCC suffix rule.10 ms
Discarding 4078 places :
Also discarding 0 output transitions
Applied a total of 1 rules in 230 ms. Remains 786 /4864 variables (removed 4078) and now considering 4096/4096 (removed 0) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 242 ms. Remains : 786/4864 places, 4096/4096 transitions.
RANDOM walk for 40000 steps (176 resets) in 11692 ms. (3 steps per ms) remains 2/2 properties
BEST_FIRST walk for 40004 steps (8 resets) in 715 ms. (55 steps per ms) remains 2/2 properties
BEST_FIRST walk for 40004 steps (8 resets) in 482 ms. (82 steps per ms) remains 2/2 properties
Interrupted probabilistic random walk after 326414 steps, run timeout after 9005 ms. (steps per millisecond=36 ) properties seen :0 out of 2
Probabilistic random walk after 326414 steps, saw 326304 distinct states, run finished after 9009 ms. (steps per millisecond=36 ) properties seen :0
// Phase 1: matrix 4096 rows 786 cols
[2024-06-01 21:48:08] [INFO ] Computed 47 invariants in 2103 ms
All remaining problems are real, not stopping.
At refinement iteration 0 (INCLUDED_ONLY) 0/276 variables, 276/276 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/276 variables, 0/276 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 2 (OVERLAPS) 509/785 variables, 46/322 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/785 variables, 509/831 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/785 variables, 0/831 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 5 (OVERLAPS) 1/786 variables, 1/832 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/786 variables, 1/833 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/786 variables, 0/833 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 8 (OVERLAPS) 4096/4882 variables, 786/1619 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 9 (INCLUDED_ONLY) 0/4882 variables, 0/1619 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 10 (OVERLAPS) 0/4882 variables, 0/1619 constraints. Problems are: Problem set: 0 solved, 2 unsolved
No progress, stopping.
After SMT solving in domain Real declared 4882/4882 variables, and 1619 constraints, problems are : Problem set: 0 solved, 2 unsolved in 3956 ms.
Refiners :[Domain max(s): 786/786 constraints, Generalized P Invariants (flows): 47/47 constraints, State Equation: 786/786 constraints, PredecessorRefiner: 2/1 constraints, Known Traps: 0/0 constraints]
Escalating to Integer solving :Problem set: 0 solved, 2 unsolved
At refinement iteration 0 (INCLUDED_ONLY) 0/276 variables, 276/276 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/276 variables, 0/276 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 2 (OVERLAPS) 509/785 variables, 46/322 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/785 variables, 509/831 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/785 variables, 0/831 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 5 (OVERLAPS) 1/786 variables, 1/832 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/786 variables, 1/833 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/786 variables, 0/833 constraints. Problems are: Problem set: 0 solved, 2 unsolved
At refinement iteration 8 (OVERLAPS) 4096/4882 variables, 786/1619 constraints. Problems are: Problem set: 0 solved, 2 unsolved
Solver is answering 'unknown', stopping.
After SMT solving in domain Int declared 4882/4882 variables, and 1620 constraints, problems are : Problem set: 0 solved, 2 unsolved in 22941 ms.
Refiners :[Domain max(s): 786/786 constraints, Generalized P Invariants (flows): 47/47 constraints, State Equation: 786/786 constraints, PredecessorRefiner: 2/1 constraints, Known Traps: 0/0 constraints]
After SMT, in 29090ms problems are : Problem set: 0 solved, 2 unsolved
Fused 2 Parikh solutions to 1 different solutions.
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-03 FALSE TECHNIQUES PARIKH_WALK
Parikh walk visited 1 properties in 1084 ms.
Support contains 20 out of 786 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 786/786 places, 4096/4096 transitions.
Graph (complete) has 54 edges and 786 vertex of which 131 are kept as prefixes of interest. Removing 655 places using SCC suffix rule.4 ms
Discarding 655 places :
Also discarding 2568 output transitions
Drop transitions (Output transitions of discarded places.) removed 2568 transitions
Drop transitions (Empty/Sink Transition effects.) removed 1478 transitions
Reduce isomorphic transitions removed 1478 transitions.
Iterating post reduction 0 with 1478 rules applied. Total rules applied 1479 place count 131 transition count 50
Ensure Unique test removed 55 places
Iterating post reduction 1 with 55 rules applied. Total rules applied 1534 place count 76 transition count 50
Discarding 26 places :
Symmetric choice reduction at 2 with 26 rule applications. Total rules 1560 place count 50 transition count 24
Ensure Unique test removed 1 places
Iterating global reduction 2 with 27 rules applied. Total rules applied 1587 place count 49 transition count 24
Applied a total of 1587 rules in 26 ms. Remains 49 /786 variables (removed 737) and now considering 24/4096 (removed 4072) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 28 ms. Remains : 49/786 places, 24/4096 transitions.
RANDOM walk for 439 steps (21 resets) in 9 ms. (43 steps per ms) remains 0/1 properties
FORMULA Sudoku-PT-AN16-ReachabilityCardinality-2024-11 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
All properties solved without resorting to model-checking.
Total runtime 58508 ms.
ITS solved all properties within timeout

BK_STOP 1717278516416

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

+ 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//../reducer/bin//../../itstools//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202405141337.jar
+ VERSION=202405141337
+ echo 'Running Version 202405141337'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityCardinality -timeout 360 -rebuildPNML

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-PT-AN16"
export BK_EXAMINATION="ReachabilityCardinality"
export BK_TOOL="ltsminxred"
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 ltsminxred"
echo " Input is Sudoku-PT-AN16, 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 r536-tall-171690532900694"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/Sudoku-PT-AN16.tgz
mv Sudoku-PT-AN16 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 ;