Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2023-input.r235-tall-167856421200053.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2023-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 2-5348
Executing tool smartxred
Input is HypertorusGrid-PT-d3k3p2b06, examination is UpperBounds
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r235-tall-167856421200053
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 976K
-rw-r--r-- 1 mcc users 8.2K Feb 26 11:27 CTLCardinality.txt
-rw-r--r-- 1 mcc users 72K Feb 26 11:27 CTLCardinality.xml
-rw-r--r-- 1 mcc users 8.2K Feb 26 11:08 CTLFireability.txt
-rw-r--r-- 1 mcc users 58K Feb 26 11:08 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:40 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 4.5K Feb 25 16:17 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K Feb 25 16:17 LTLCardinality.xml
-rw-r--r-- 1 mcc users 3.3K Feb 25 16:17 LTLFireability.txt
-rw-r--r-- 1 mcc users 19K Feb 25 16:17 LTLFireability.xml
-rw-r--r-- 1 mcc users 11K Feb 26 11:55 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 84K Feb 26 11:55 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 15K Feb 26 11:42 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 96K Feb 26 11:42 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.9K Feb 25 16:17 UpperBounds.txt
-rw-r--r-- 1 mcc users 4.0K Feb 25 16:17 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 equiv_col
-rw-r--r-- 1 mcc users 10 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 iscolored
-rwxr-xr-x 1 mcc users 522K Mar 5 18:22 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 HypertorusGrid-PT-d3k3p2b06-UpperBounds-00
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-01
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-02
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-03
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-04
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-05
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-06
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-07
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-08
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-09
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-10
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-11
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-12
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-13
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-14
FORMULA_NAME HypertorusGrid-PT-d3k3p2b06-UpperBounds-15

=== Now, execution of the tool begins

BK_START 1678628001965

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=smartxred
BK_EXAMINATION=UpperBounds
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=HypertorusGrid-PT-d3k3p2b06
Applying reductions before tool smart
Invoking reducer
Running Version 202303021504
[2023-03-12 13:33:23] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, UpperBounds, -timeout, 360, -rebuildPNML]
[2023-03-12 13:33:23] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-12 13:33:23] [INFO ] Load time of PNML (sax parser for PT used): 80 ms
[2023-03-12 13:33:23] [INFO ] Transformed 513 places.
[2023-03-12 13:33:23] [INFO ] Transformed 972 transitions.
[2023-03-12 13:33:23] [INFO ] Parsed PT model containing 513 places and 972 transitions and 3888 arcs in 147 ms.
Parsed 16 properties from file /home/mcc/execution/UpperBounds.xml in 4 ms.
// Phase 1: matrix 972 rows 513 cols
[2023-03-12 13:33:23] [INFO ] Computed 190 place invariants in 56 ms
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-06 1 TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-03 1 TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-02 1 TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-01 1 TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-00 1 TECHNIQUES TOPOLOGICAL INITIAL_STATE
Incomplete random walk after 10000 steps, including 2 resets, run finished after 360 ms. (steps per millisecond=27 ) properties (out of 11) seen :62
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-15 1 TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-12 1 TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-09 1 TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-07 1 TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-05 1 TECHNIQUES TOPOLOGICAL RANDOM_WALK
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 66 ms. (steps per millisecond=151 ) properties (out of 6) seen :25
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 56 ms. (steps per millisecond=178 ) properties (out of 6) seen :23
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 58 ms. (steps per millisecond=172 ) properties (out of 6) seen :32
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 58 ms. (steps per millisecond=172 ) properties (out of 6) seen :25
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 53 ms. (steps per millisecond=188 ) properties (out of 6) seen :29
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 64 ms. (steps per millisecond=156 ) properties (out of 6) seen :24
[2023-03-12 13:33:24] [INFO ] Invariant cache hit.
[2023-03-12 13:33:24] [INFO ] [Real]Absence check using 189 positive place invariants in 39 ms returned sat
[2023-03-12 13:33:24] [INFO ] [Real]Absence check using 189 positive and 1 generalized place invariants in 9 ms returned sat
[2023-03-12 13:33:24] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2023-03-12 13:33:24] [INFO ] [Real]Absence check using state equation in 221 ms returned sat
[2023-03-12 13:33:24] [INFO ] Solution in real domain found non-integer solution.
[2023-03-12 13:33:25] [INFO ] [Nat]Absence check using 189 positive place invariants in 33 ms returned sat
[2023-03-12 13:33:25] [INFO ] [Nat]Absence check using 189 positive and 1 generalized place invariants in 8 ms returned sat
[2023-03-12 13:33:25] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2023-03-12 13:33:25] [INFO ] [Nat]Absence check using state equation in 224 ms returned sat
[2023-03-12 13:33:25] [INFO ] Computed and/alt/rep : 810/810/810 causal constraints (skipped 0 transitions) in 117 ms.
[2023-03-12 13:33:26] [INFO ] Added : 161 causal constraints over 33 iterations in 1607 ms. Result :sat
Minimization took 104 ms.
[2023-03-12 13:33:27] [INFO ] [Real]Absence check using 189 positive place invariants in 30 ms returned sat
[2023-03-12 13:33:27] [INFO ] [Real]Absence check using 189 positive and 1 generalized place invariants in 8 ms returned sat
[2023-03-12 13:33:27] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2023-03-12 13:33:27] [INFO ] [Real]Absence check using state equation in 210 ms returned sat
[2023-03-12 13:33:27] [INFO ] Solution in real domain found non-integer solution.
[2023-03-12 13:33:27] [INFO ] [Nat]Absence check using 189 positive place invariants in 27 ms returned sat
[2023-03-12 13:33:27] [INFO ] [Nat]Absence check using 189 positive and 1 generalized place invariants in 9 ms returned sat
[2023-03-12 13:33:27] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2023-03-12 13:33:27] [INFO ] [Nat]Absence check using state equation in 203 ms returned sat
[2023-03-12 13:33:27] [INFO ] Computed and/alt/rep : 810/810/810 causal constraints (skipped 0 transitions) in 49 ms.
[2023-03-12 13:33:29] [INFO ] Added : 158 causal constraints over 32 iterations in 1386 ms. Result :sat
Minimization took 74 ms.
[2023-03-12 13:33:29] [INFO ] [Real]Absence check using 189 positive place invariants in 27 ms returned sat
[2023-03-12 13:33:29] [INFO ] [Real]Absence check using 189 positive and 1 generalized place invariants in 9 ms returned sat
[2023-03-12 13:33:29] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2023-03-12 13:33:29] [INFO ] [Real]Absence check using state equation in 196 ms returned sat
[2023-03-12 13:33:29] [INFO ] Computed and/alt/rep : 810/810/810 causal constraints (skipped 0 transitions) in 50 ms.
[2023-03-12 13:33:31] [INFO ] Added : 159 causal constraints over 32 iterations in 1527 ms. Result :sat
Minimization took 89 ms.
[2023-03-12 13:33:31] [INFO ] Solution in real domain found non-integer solution.
[2023-03-12 13:33:31] [INFO ] [Nat]Absence check using 189 positive place invariants in 25 ms returned sat
[2023-03-12 13:33:31] [INFO ] [Nat]Absence check using 189 positive and 1 generalized place invariants in 9 ms returned sat
[2023-03-12 13:33:31] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2023-03-12 13:33:31] [INFO ] [Nat]Absence check using state equation in 208 ms returned sat
[2023-03-12 13:33:31] [INFO ] Computed and/alt/rep : 810/810/810 causal constraints (skipped 0 transitions) in 45 ms.
[2023-03-12 13:33:33] [INFO ] Added : 159 causal constraints over 32 iterations in 1398 ms. Result :sat
Minimization took 69 ms.
[2023-03-12 13:33:33] [INFO ] [Real]Absence check using 189 positive place invariants in 25 ms returned sat
[2023-03-12 13:33:33] [INFO ] [Real]Absence check using 189 positive and 1 generalized place invariants in 8 ms returned sat
[2023-03-12 13:33:33] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2023-03-12 13:33:33] [INFO ] [Real]Absence check using state equation in 193 ms returned sat
[2023-03-12 13:33:33] [INFO ] Computed and/alt/rep : 810/810/810 causal constraints (skipped 0 transitions) in 45 ms.
[2023-03-12 13:33:34] [INFO ] Added : 159 causal constraints over 32 iterations in 1497 ms. Result :sat
Minimization took 91 ms.
[2023-03-12 13:33:35] [INFO ] Solution in real domain found non-integer solution.
[2023-03-12 13:33:35] [INFO ] [Nat]Absence check using 189 positive place invariants in 26 ms returned sat
[2023-03-12 13:33:35] [INFO ] [Nat]Absence check using 189 positive and 1 generalized place invariants in 8 ms returned sat
[2023-03-12 13:33:35] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2023-03-12 13:33:35] [INFO ] [Nat]Absence check using state equation in 200 ms returned sat
[2023-03-12 13:33:35] [INFO ] Computed and/alt/rep : 810/810/810 causal constraints (skipped 0 transitions) in 42 ms.
[2023-03-12 13:33:36] [INFO ] Added : 159 causal constraints over 32 iterations in 1370 ms. Result :sat
Minimization took 72 ms.
[2023-03-12 13:33:36] [INFO ] [Real]Absence check using 189 positive place invariants in 23 ms returned sat
[2023-03-12 13:33:36] [INFO ] [Real]Absence check using 189 positive and 1 generalized place invariants in 13 ms returned sat
[2023-03-12 13:33:36] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2023-03-12 13:33:37] [INFO ] [Real]Absence check using state equation in 200 ms returned sat
[2023-03-12 13:33:37] [INFO ] Computed and/alt/rep : 810/810/810 causal constraints (skipped 0 transitions) in 40 ms.
[2023-03-12 13:33:38] [INFO ] Added : 159 causal constraints over 32 iterations in 1450 ms. Result :sat
Minimization took 89 ms.
[2023-03-12 13:33:38] [INFO ] Solution in real domain found non-integer solution.
[2023-03-12 13:33:38] [INFO ] [Nat]Absence check using 189 positive place invariants in 27 ms returned sat
[2023-03-12 13:33:38] [INFO ] [Nat]Absence check using 189 positive and 1 generalized place invariants in 9 ms returned sat
[2023-03-12 13:33:38] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2023-03-12 13:33:39] [INFO ] [Nat]Absence check using state equation in 192 ms returned sat
[2023-03-12 13:33:39] [INFO ] Computed and/alt/rep : 810/810/810 causal constraints (skipped 0 transitions) in 45 ms.
[2023-03-12 13:33:40] [INFO ] Added : 159 causal constraints over 32 iterations in 1348 ms. Result :sat
Minimization took 70 ms.
[2023-03-12 13:33:40] [INFO ] [Real]Absence check using 189 positive place invariants in 28 ms returned sat
[2023-03-12 13:33:40] [INFO ] [Real]Absence check using 189 positive and 1 generalized place invariants in 9 ms returned sat
[2023-03-12 13:33:40] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2023-03-12 13:33:40] [INFO ] [Real]Absence check using state equation in 201 ms returned sat
[2023-03-12 13:33:40] [INFO ] Solution in real domain found non-integer solution.
[2023-03-12 13:33:41] [INFO ] [Nat]Absence check using 189 positive place invariants in 26 ms returned sat
[2023-03-12 13:33:41] [INFO ] [Nat]Absence check using 189 positive and 1 generalized place invariants in 8 ms returned sat
[2023-03-12 13:33:41] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2023-03-12 13:33:41] [INFO ] [Nat]Absence check using state equation in 198 ms returned sat
[2023-03-12 13:33:41] [INFO ] Computed and/alt/rep : 810/810/810 causal constraints (skipped 0 transitions) in 46 ms.
[2023-03-12 13:33:42] [INFO ] Added : 159 causal constraints over 32 iterations in 1367 ms. Result :sat
Minimization took 70 ms.
Current structural bounds on expressions (after SMT) : [18, 18, 18, 18, 18, 324] Max seen :[4, 6, 15, 10, 16, 6]
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-13 18 TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-11 18 TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-10 18 TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-08 18 TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-04 18 TECHNIQUES TOPOLOGICAL PARIKH_WALK
Support contains 1 out of 513 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 513/513 places, 972/972 transitions.
Applied a total of 0 rules in 78 ms. Remains 513 /513 variables (removed 0) and now considering 972/972 (removed 0) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 80 ms. Remains : 513/513 places, 972/972 transitions.
[2023-03-12 13:33:47] [INFO ] Invariant cache hit.
Incomplete random walk after 1000000 steps, including 20 resets, run finished after 25601 ms. (steps per millisecond=39 ) properties (out of 1) seen :11
Incomplete Best-First random walk after 1000001 steps, including 2 resets, run finished after 4515 ms. (steps per millisecond=221 ) properties (out of 1) seen :18
[2023-03-12 13:34:17] [INFO ] Invariant cache hit.
[2023-03-12 13:34:18] [INFO ] [Real]Absence check using 189 positive place invariants in 27 ms returned sat
[2023-03-12 13:34:18] [INFO ] [Real]Absence check using 189 positive and 1 generalized place invariants in 1 ms returned unsat
Current structural bounds on expressions (after SMT) : [18] Max seen :[18]
FORMULA HypertorusGrid-PT-d3k3p2b06-UpperBounds-14 18 TECHNIQUES TOPOLOGICAL SAT_SMT RANDOM_WALK
All properties solved without resorting to model-checking.
Total runtime 54673 ms.
ITS solved all properties within timeout

BK_STOP 1678628058819

--------------------
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_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination UpperBounds -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="HypertorusGrid-PT-d3k3p2b06"
export BK_EXAMINATION="UpperBounds"
export BK_TOOL="smartxred"
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 2-5348"
echo " Executing tool smartxred"
echo " Input is HypertorusGrid-PT-d3k3p2b06, 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 r235-tall-167856421200053"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/HypertorusGrid-PT-d3k3p2b06.tgz
mv HypertorusGrid-PT-d3k3p2b06 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 ;