About the Execution of ITS-Tools for HirschbergSinclair-PT-45
| Execution Summary | |||||
| Max Memory Used (MB) |
Time wait (ms) | CPU Usage (ms) | I/O Wait (ms) | Computed Result | Execution Status |
| 0.000 | 14659.00 | 0.00 | 0.00 | 1 1 1 1 1 1 1 2 1 1 1 1 1 1 1 1 | normal |
Execution Chart
Sorry, for this execution, no execution chart could be reported.
Trace from the execution
Formatting '/data/fkordon/mcc2025-input.r114-tall-174876422100125.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2025-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 2-5832
Executing tool itstools
Input is HirschbergSinclair-PT-45, examination is UpperBounds
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r114-tall-174876422100125
=====================================================================
--------------------
preparation of the directory to be used:
/home/mcc/execution
total 1.1M
-rw-r--r-- 1 mcc users 14K May 29 14:47 CTLCardinality.txt
-rw-r--r-- 1 mcc users 106K May 29 14:47 CTLCardinality.xml
-rw-r--r-- 1 mcc users 8.3K May 29 14:47 CTLFireability.txt
-rw-r--r-- 1 mcc users 53K May 29 14:47 CTLFireability.xml
-rw-r--r-- 1 mcc users 5.9K May 29 14:47 LTLCardinality.txt
-rw-r--r-- 1 mcc users 30K May 29 14:47 LTLCardinality.xml
-rw-r--r-- 1 mcc users 3.3K May 29 14:47 LTLFireability.txt
-rw-r--r-- 1 mcc users 19K May 29 14:47 LTLFireability.xml
-rw-r--r-- 1 mcc users 19K May 29 14:47 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 133K May 29 14:47 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 11K May 29 14:47 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 60K May 29 14:47 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 2.1K May 29 14:47 UpperBounds.txt
-rw-r--r-- 1 mcc users 4.1K May 29 14:47 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 29 14:32 equiv_col
-rw-r--r-- 1 mcc users 3 May 29 14:32 instance
-rw-r--r-- 1 mcc users 6 May 29 14:32 iscolored
-rw-r--r-- 1 mcc users 616K May 29 14:32 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
echo here is the order used to build the result vector(from xml file)
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-00
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-01
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-02
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-03
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-04
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-05
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-06
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-07
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-08
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-09
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-10
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-11
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-12
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-13
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-14
FORMULA_NAME HirschbergSinclair-PT-45-UpperBounds-15
=== Now, execution of the tool begins
BK_START 1748786120526
Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=UpperBounds
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=HirschbergSinclair-PT-45
BK_MEMORY_CONFINEMENT=16384
Not applying reductions.
Model is PT
UpperBounds PT
Running Version 202505121319
[2025-06-01 13:55:21] [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]
[2025-06-01 13:55:21] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2025-06-01 13:55:22] [INFO ] Load time of PNML (sax parser for PT used): 119 ms
[2025-06-01 13:55:22] [INFO ] Transformed 1138 places.
[2025-06-01 13:55:22] [INFO ] Transformed 1042 transitions.
[2025-06-01 13:55:22] [INFO ] Parsed PT model containing 1138 places and 1042 transitions and 3176 arcs in 239 ms.
Parsed 16 properties from file /home/mcc/execution/UpperBounds.xml in 9 ms.
Current structural bounds on expressions (Initially) : Max Seen:[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] Max Struct:[+inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf]
Current structural bounds on expressions (Before main loop) : Max Seen:[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] Max Struct:[+inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf, +inf]
// Phase 1: matrix 1042 rows 1138 cols
[2025-06-01 13:55:22] [INFO ] Computed 96 invariants in 48 ms
Current structural bounds on expressions (after invariants) : Max Seen:[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0] Max Struct:[1, 1, +inf, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 65, 2, 1]
RANDOM walk for 10000 steps (9 resets) in 97 ms. (102 steps per ms)
FORMULA HirschbergSinclair-PT-45-UpperBounds-15 1 TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-12 1 TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-11 1 TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-10 1 TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-09 1 TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-08 1 TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-06 1 TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-04 1 TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-03 1 TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-01 1 TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-00 1 TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
BEST_FIRST walk for 50005 steps (10 resets) in 124 ms. (400 steps per ms)
Current structural bounds on expressions (after WALK) : Max Seen:[1, 1, 1, 1, 1] Max Struct:[+inf, 2, 2, 65, 2]
[2025-06-01 13:55:22] [INFO ] Invariant cache hit.
Starting Z3 with timeout 5.0 s and query timeout 500.0 ms
[2025-06-01 13:55:22] [INFO ] [Real]Absence check using 90 positive place invariants in 51 ms returned sat
[2025-06-01 13:55:22] [INFO ] [Real]Absence check using 90 positive and 6 generalized place invariants in 4 ms returned sat
[2025-06-01 13:55:23] [INFO ] [Real]Absence check using state equation in 181 ms returned unsat
Starting Z3 with timeout 5.0 s and query timeout 500.0 ms
[2025-06-01 13:55:23] [INFO ] [Real]Absence check using 90 positive place invariants in 49 ms returned sat
[2025-06-01 13:55:23] [INFO ] [Real]Absence check using 90 positive and 6 generalized place invariants in 5 ms returned sat
[2025-06-01 13:55:24] [INFO ] [Real]Absence check using state equation in 672 ms returned unsat
Starting Z3 with timeout 5.0 s and query timeout 500.0 ms
[2025-06-01 13:55:24] [INFO ] [Real]Absence check using 90 positive place invariants in 40 ms returned sat
[2025-06-01 13:55:24] [INFO ] [Real]Absence check using 90 positive and 6 generalized place invariants in 5 ms returned sat
[2025-06-01 13:55:25] [INFO ] [Real]Absence check using state equation in 811 ms returned sat
Starting Z3 with timeout 120.0 s and query timeout 12000.0 ms
[2025-06-01 13:55:25] [INFO ] Deduced a trap composed of 19 places in 358 ms of which 53 ms to minimize.
[2025-06-01 13:55:25] [INFO ] Solution in real domain found non-integer solution.
Starting Z3 with timeout 5.0 s and query timeout 500.0 ms
[2025-06-01 13:55:25] [INFO ] [Nat]Absence check using 90 positive place invariants in 38 ms returned sat
[2025-06-01 13:55:25] [INFO ] [Nat]Absence check using 90 positive and 6 generalized place invariants in 5 ms returned sat
[2025-06-01 13:55:26] [INFO ] [Nat]Absence check using state equation in 770 ms returned sat
Starting Z3 with timeout 120.0 s and query timeout 12000.0 ms
[2025-06-01 13:55:27] [INFO ] Deduced a trap composed of 19 places in 316 ms of which 26 ms to minimize.
[2025-06-01 13:55:27] [INFO ] Trap strengthening (SAT) tested/added 2/1 trap constraints in 443 ms
[2025-06-01 13:55:27] [INFO ] Computed and/alt/rep : 479/485/479 causal constraints (skipped 518 transitions) in 66 ms.
[2025-06-01 13:55:30] [INFO ] Added : 190 causal constraints over 38 iterations in 3602 ms. Result :unknown
Starting Z3 with timeout 5.0 s and query timeout 500.0 ms
[2025-06-01 13:55:30] [INFO ] [Real]Absence check using 90 positive place invariants in 38 ms returned sat
[2025-06-01 13:55:30] [INFO ] [Real]Absence check using 90 positive and 6 generalized place invariants in 4 ms returned unsat
Starting Z3 with timeout 5.0 s and query timeout 500.0 ms
[2025-06-01 13:55:31] [INFO ] [Real]Absence check using 90 positive place invariants in 41 ms returned sat
[2025-06-01 13:55:31] [INFO ] [Real]Absence check using 90 positive and 6 generalized place invariants in 5 ms returned sat
[2025-06-01 13:55:31] [INFO ] [Real]Absence check using state equation in 638 ms returned unsat
Current structural bounds on expressions (after SMT) : Max Seen:[1, 1, 1, 1, 1] Max Struct:[1, 1, 2, 1, 1]
FORMULA HirschbergSinclair-PT-45-UpperBounds-14 1 TECHNIQUES TOPOLOGICAL SAT_SMT RANDOM_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-13 1 TECHNIQUES TOPOLOGICAL SAT_SMT RANDOM_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-05 1 TECHNIQUES TOPOLOGICAL SAT_SMT RANDOM_WALK
FORMULA HirschbergSinclair-PT-45-UpperBounds-02 1 TECHNIQUES TOPOLOGICAL SAT_SMT RANDOM_WALK
Current structural bounds on expressions (After Parikh guided walk) : Max Seen:[1] Max Struct:[2]
Support contains 1 out of 1138 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 1138/1138 places, 1042/1042 transitions.
Graph (complete) has 2184 edges and 1138 vertex of which 1049 are kept as prefixes of interest. Removing 89 places using SCC suffix rule.7 ms
Discarding 89 places :
Also discarding 0 output transitions
Drop transitions (Empty/Sink Transition effects.) removed 44 transitions
Reduce isomorphic transitions removed 44 transitions.
Drop transitions (Trivial Post-Agglo cleanup.) removed 471 transitions
Trivial Post-agglo rules discarded 471 transitions
Performed 471 trivial Post agglomeration. Transition count delta: 471
Iterating post reduction 0 with 515 rules applied. Total rules applied 516 place count 1049 transition count 527
Reduce places removed 471 places and 0 transitions.
Graph (complete) has 933 edges and 578 vertex of which 447 are kept as prefixes of interest. Removing 131 places using SCC suffix rule.1 ms
Discarding 131 places :
Also discarding 0 output transitions
Iterating post reduction 1 with 472 rules applied. Total rules applied 988 place count 447 transition count 527
Drop transitions (Empty/Sink Transition effects.) removed 131 transitions
Reduce isomorphic transitions removed 131 transitions.
Iterating post reduction 2 with 131 rules applied. Total rules applied 1119 place count 447 transition count 396
Discarding 1 places :
Symmetric choice reduction at 3 with 1 rule applications. Total rules 1120 place count 446 transition count 395
Iterating global reduction 3 with 1 rules applied. Total rules applied 1121 place count 446 transition count 395
Discarding 1 places :
Symmetric choice reduction at 3 with 1 rule applications. Total rules 1122 place count 445 transition count 394
Iterating global reduction 3 with 1 rules applied. Total rules applied 1123 place count 445 transition count 394
Free-agglomeration rule (complex) applied 1 times.
Iterating global reduction 3 with 1 rules applied. Total rules applied 1124 place count 445 transition count 393
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 3 with 1 rules applied. Total rules applied 1125 place count 444 transition count 393
Reduce places removed 45 places and 45 transitions.
Iterating global reduction 4 with 45 rules applied. Total rules applied 1170 place count 399 transition count 348
Reduce places removed 44 places and 0 transitions.
Drop transitions (Trivial Post-Agglo cleanup.) removed 308 transitions
Trivial Post-agglo rules discarded 308 transitions
Performed 308 trivial Post agglomeration. Transition count delta: 308
Iterating post reduction 4 with 352 rules applied. Total rules applied 1522 place count 355 transition count 40
Reduce places removed 308 places and 0 transitions.
Iterating post reduction 5 with 308 rules applied. Total rules applied 1830 place count 47 transition count 40
Performed 18 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 6 with 18 Pre rules applied. Total rules applied 1830 place count 47 transition count 22
Renaming transitions due to excessive name length > 1024 char.
Deduced a syphon composed of 18 places in 0 ms
Reduce places removed 18 places and 0 transitions.
Iterating global reduction 6 with 36 rules applied. Total rules applied 1866 place count 29 transition count 22
Discarding 5 places :
Implicit places reduction removed 5 places
Iterating post reduction 6 with 5 rules applied. Total rules applied 1871 place count 24 transition count 22
Performed 5 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 7 with 5 Pre rules applied. Total rules applied 1871 place count 24 transition count 17
Deduced a syphon composed of 5 places in 0 ms
Reduce places removed 5 places and 0 transitions.
Iterating global reduction 7 with 10 rules applied. Total rules applied 1881 place count 19 transition count 17
Performed 2 Post agglomeration using F-continuation condition.Transition count delta: 2
Deduced a syphon composed of 2 places in 0 ms
Reduce places removed 2 places and 0 transitions.
Iterating global reduction 7 with 4 rules applied. Total rules applied 1885 place count 17 transition count 15
Discarding 1 places :
Symmetric choice reduction at 7 with 1 rule applications. Total rules 1886 place count 16 transition count 14
Iterating global reduction 7 with 1 rules applied. Total rules applied 1887 place count 16 transition count 14
Applied a total of 1887 rules in 180 ms. Remains 16 /1138 variables (removed 1122) and now considering 14/1042 (removed 1028) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 187 ms. Remains : 16/1138 places, 14/1042 transitions.
// Phase 1: matrix 14 rows 16 cols
[2025-06-01 13:55:32] [INFO ] Computed 2 invariants in 0 ms
Current structural bounds on expressions (after invariants) : Max Seen:[1] Max Struct:[2]
RANDOM walk for 1000000 steps (52795 resets) in 1235 ms. (809 steps per ms)
FORMULA HirschbergSinclair-PT-45-UpperBounds-07 2 TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
BEST_FIRST walk for 1000000 steps (43478 resets) in 977 ms. (1022 steps per ms)
Current structural bounds on expressions (after WALK) : Max Seen:[] Max Struct:[]
RANDOM walk for 0 steps (0 resets) in 4 ms. (0 steps per ms) remains 0/0 properties
Finished probabilistic random walk after 0 steps, run visited all 0 properties in 0 ms. (steps per millisecond=0 )
[2025-06-01 13:55:35] [INFO ] Flatten gal took : 26 ms
[2025-06-01 13:55:35] [INFO ] Flatten gal took : 3 ms
[2025-06-01 13:55:35] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality3466169264454865292.gal : 3 ms
[2025-06-01 13:55:35] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality13877984135539263455.prop : 0 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202505121319/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality3466169264454865292.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality13877984135539263455.prop' '--nowitness' '--gen-order' 'FOLLOW'
ITS runner timed out or was interrupted.
ITS tools runner thread asked to quit. Dying gracefully.
Current structural bounds on expressions (After reachability solving 0 queries.) : Max Seen:[] Max Struct:[]
All properties solved without resorting to model-checking.
Total runtime 13204 ms.
BK_STOP 1748786135185
--------------------
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
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202505121319.jar
+ VERSION=202505121319
+ echo 'Running Version 202505121319'
+ /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="HirschbergSinclair-PT-45"
export BK_EXAMINATION="UpperBounds"
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 2-5832"
echo " Executing tool itstools"
echo " Input is HirschbergSinclair-PT-45, 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 r114-tall-174876422100125"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"
tar xzf /home/mcc/BenchKit/INPUTS/HirschbergSinclair-PT-45.tgz
mv HirschbergSinclair-PT-45 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.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 '
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 ;