fond
Model Checking Contest 2023
13th edition, Paris, France, April 26, 2023 (at TOOLympics II)
Execution of r075-smll-167814400600118
Last Updated
May 14, 2023

About the Execution of Smart+red for CircadianClock-PT-000100

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
1983.432 133623.00 142899.00 728.10 FTTFFFFTFFFTTTFF normal

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.r075-smll-167814400600118.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 CircadianClock-PT-000100, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r075-smll-167814400600118
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 476K
-rw-r--r-- 1 mcc users 6.7K Feb 26 10:37 CTLCardinality.txt
-rw-r--r-- 1 mcc users 70K Feb 26 10:37 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.5K Feb 26 10:34 CTLFireability.txt
-rw-r--r-- 1 mcc users 45K Feb 26 10:34 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:40 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.7K Jan 29 11:40 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 3.5K Feb 25 15:42 LTLCardinality.txt
-rw-r--r-- 1 mcc users 24K Feb 25 15:42 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.4K Feb 25 15:42 LTLFireability.txt
-rw-r--r-- 1 mcc users 16K Feb 25 15:42 LTLFireability.xml
-rw-r--r-- 1 mcc users 13K Feb 26 10:38 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 132K Feb 26 10:38 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 11K Feb 26 10:38 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 84K Feb 26 10:38 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Feb 25 15:42 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.8K Feb 25 15:42 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 equiv_col
-rw-r--r-- 1 mcc users 7 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 11K 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 booleans
BOOL_VECTOR

here is the order used to build the result vector(from text file)
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-00
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-01
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-02
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-03
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-04
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-05
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-06
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-07
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-08
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-09
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-10
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-11
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-12
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-13
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-14
FORMULA_NAME CircadianClock-PT-000100-ReachabilityCardinality-15

=== Now, execution of the tool begins

BK_START 1678249109370

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=ReachabilityCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=CircadianClock-PT-000100
Applying reductions before tool smart
Invoking reducer
Running Version 202303021504
[2023-03-08 04:18:32] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -timeout, 360, -rebuildPNML]
[2023-03-08 04:18:32] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-08 04:18:32] [INFO ] Load time of PNML (sax parser for PT used): 34 ms
[2023-03-08 04:18:32] [INFO ] Transformed 14 places.
[2023-03-08 04:18:32] [INFO ] Transformed 16 transitions.
[2023-03-08 04:18:32] [INFO ] Parsed PT model containing 14 places and 16 transitions and 58 arcs in 151 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 31 ms.
Working with output stream class java.io.PrintStream
Incomplete random walk after 10032 steps, including 2 resets, run finished after 87 ms. (steps per millisecond=115 ) properties (out of 16) seen :10
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-15 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-14 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-13 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-12 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-10 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-08 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-04 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-03 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-01 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-00 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 90 ms. (steps per millisecond=111 ) properties (out of 6) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 108 ms. (steps per millisecond=92 ) properties (out of 6) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 107 ms. (steps per millisecond=93 ) properties (out of 6) seen :0
Incomplete Best-First random walk after 10000 steps, including 2 resets, run finished after 65 ms. (steps per millisecond=153 ) properties (out of 6) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 50 ms. (steps per millisecond=200 ) properties (out of 6) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 57 ms. (steps per millisecond=175 ) properties (out of 6) seen :0
Running SMT prover for 6 properties.
[2023-03-08 04:18:33] [INFO ] Flow matrix only has 14 transitions (discarded 2 similar events)
// Phase 1: matrix 14 rows 14 cols
[2023-03-08 04:18:33] [INFO ] Computed 7 place invariants in 6 ms
[2023-03-08 04:18:33] [INFO ] [Real]Absence check using 7 positive place invariants in 5 ms returned sat
[2023-03-08 04:18:33] [INFO ] After 223ms SMT Verify possible using all constraints in real domain returned unsat :2 sat :0 real:4
[2023-03-08 04:18:33] [INFO ] [Nat]Absence check using 7 positive place invariants in 4 ms returned sat
[2023-03-08 04:18:33] [INFO ] After 26ms SMT Verify possible using state equation in natural domain returned unsat :5 sat :1
[2023-03-08 04:18:33] [INFO ] State equation strengthened by 2 read => feed constraints.
[2023-03-08 04:18:33] [INFO ] After 11ms SMT Verify possible using 2 Read/Feed constraints in natural domain returned unsat :5 sat :1
[2023-03-08 04:18:33] [INFO ] After 24ms SMT Verify possible using trap constraints in natural domain returned unsat :5 sat :1
Attempting to minimize the solution found.
Minimization took 16 ms.
[2023-03-08 04:18:33] [INFO ] After 133ms SMT Verify possible using all constraints in natural domain returned unsat :5 sat :1
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-11 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-09 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-07 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-05 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-02 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
Fused 6 Parikh solutions to 1 different solutions.
Parikh walk visited 0 properties in 7 ms.
Support contains 13 out of 14 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 14/14 places, 16/16 transitions.
Applied a total of 0 rules in 14 ms. Remains 14 /14 variables (removed 0) and now considering 16/16 (removed 0) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 14 ms. Remains : 14/14 places, 16/16 transitions.
Incomplete random walk after 10019 steps, including 2 resets, run finished after 6 ms. (steps per millisecond=1669 ) properties (out of 1) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 24 ms. (steps per millisecond=416 ) properties (out of 1) seen :0
Interrupted probabilistic random walk after 1877758 steps, run timeout after 3001 ms. (steps per millisecond=625 ) properties seen :{}
Probabilistic random walk after 1877758 steps, saw 975130 distinct states, run finished after 3005 ms. (steps per millisecond=624 ) properties seen :0
Running SMT prover for 1 properties.
[2023-03-08 04:18:36] [INFO ] Flow matrix only has 14 transitions (discarded 2 similar events)
[2023-03-08 04:18:36] [INFO ] Invariant cache hit.
[2023-03-08 04:18:36] [INFO ] After 29ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:1
[2023-03-08 04:18:36] [INFO ] [Nat]Absence check using 7 positive place invariants in 3 ms returned sat
[2023-03-08 04:18:36] [INFO ] After 17ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :1
[2023-03-08 04:18:36] [INFO ] State equation strengthened by 2 read => feed constraints.
[2023-03-08 04:18:36] [INFO ] After 9ms SMT Verify possible using 2 Read/Feed constraints in natural domain returned unsat :0 sat :1
[2023-03-08 04:18:36] [INFO ] After 19ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :1
Attempting to minimize the solution found.
Minimization took 14 ms.
[2023-03-08 04:18:36] [INFO ] After 86ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :1
Parikh walk visited 0 properties in 1 ms.
Support contains 13 out of 14 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 14/14 places, 16/16 transitions.
Applied a total of 0 rules in 2 ms. Remains 14 /14 variables (removed 0) and now considering 16/16 (removed 0) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 2 ms. Remains : 14/14 places, 16/16 transitions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 14/14 places, 16/16 transitions.
Applied a total of 0 rules in 1 ms. Remains 14 /14 variables (removed 0) and now considering 16/16 (removed 0) transitions.
[2023-03-08 04:18:36] [INFO ] Flow matrix only has 14 transitions (discarded 2 similar events)
[2023-03-08 04:18:36] [INFO ] Invariant cache hit.
[2023-03-08 04:18:36] [INFO ] Implicit Places using invariants in 46 ms returned []
[2023-03-08 04:18:36] [INFO ] Flow matrix only has 14 transitions (discarded 2 similar events)
[2023-03-08 04:18:36] [INFO ] Invariant cache hit.
[2023-03-08 04:18:36] [INFO ] State equation strengthened by 2 read => feed constraints.
[2023-03-08 04:18:36] [INFO ] Implicit Places using invariants and state equation in 48 ms returned []
Implicit Place search using SMT with State Equation took 97 ms to find 0 implicit places.
[2023-03-08 04:18:36] [INFO ] Redundant transitions in 17 ms returned []
[2023-03-08 04:18:36] [INFO ] Flow matrix only has 14 transitions (discarded 2 similar events)
[2023-03-08 04:18:36] [INFO ] Invariant cache hit.
[2023-03-08 04:18:37] [INFO ] Dead Transitions using invariants and state equation in 47 ms found 0 transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 173 ms. Remains : 14/14 places, 16/16 transitions.
Ensure Unique test removed 2 transitions
Reduce isomorphic transitions removed 2 transitions.
Iterating post reduction 0 with 2 rules applied. Total rules applied 2 place count 14 transition count 14
Applied a total of 2 rules in 1 ms. Remains 14 /14 variables (removed 0) and now considering 14/16 (removed 2) transitions.
Running SMT prover for 1 properties.
[2023-03-08 04:18:37] [INFO ] Invariant cache hit.
[2023-03-08 04:18:37] [INFO ] After 22ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:1
[2023-03-08 04:18:37] [INFO ] [Nat]Absence check using 7 positive place invariants in 2 ms returned sat
[2023-03-08 04:18:37] [INFO ] After 17ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :1
[2023-03-08 04:18:37] [INFO ] After 27ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :1
Attempting to minimize the solution found.
Minimization took 9 ms.
[2023-03-08 04:18:37] [INFO ] After 62ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :1
[2023-03-08 04:18:37] [INFO ] Export to MCC of 1 properties in file /home/mcc/execution/ReachabilityCardinality.sr.xml took 5 ms.
[2023-03-08 04:18:37] [INFO ] Export to PNML in file /home/mcc/execution/model.sr.pnml of net with 14 places, 16 transitions and 58 arcs took 0 ms.
[2023-03-08 04:18:37] [INFO ] Flatten gal took : 26 ms
Total runtime 4953 ms.
There are residual formulas that ITS could not solve within timeout
======================================================
========== this is Smart for the MCC'2018 ============
======================================================
Running CircadianClock (PT), instance 000100
Examination ReachabilityCardinality
Parser /home/mcc/BenchKit/bin//../reducer/bin//../../smart/bin//parser/Cardinality.jar
Model checker /home/mcc/BenchKit/bin//../reducer/bin//../../smart/bin//rem_exec//smart

GOT IT HERE. BS
Petri model created: 14 places, 16 transitions, 58 arcs.
Final Score: 48.074
Took : 1 seconds
Reachability Cardinality file is: ReachabilityCardinality.xml
READY TO PARSE. BS
PROPERTY: CircadianClock-PT-000100-ReachabilityCardinality-06 (reachable &!potential( ( ( (tk(P2)) <= ( 75 ) ) | ( (! ( ( 28 ) <= (tk(P5)) )) & ( ( ( ( 87 ) <= (tk(P6)) ) | ( ( ( (! ( (tk(P13)) <= (tk(P3)) )) & (! ( (tk(P1)) <= ( 36 ) )) ) & ( (! ( (tk(P11)) <= ( 0 ) )) & ( (! ( ( 59 ) <= (tk(P6)) )) & (! ( (tk(P4)) <= (tk(P6)) )) ) ) ) & ( ( (! ( (tk(P8)) <= (tk(P11)) )) & (! ( ( 65 ) <= (tk(P7)) )) ) & ( ( ( ( 90 ) <= (tk(P12)) ) | ( (! ( (tk(P5)) <= ( 43 ) )) & (! ( ( 12 ) <= (tk(P5)) )) ) ) & ( ( (! ( (tk(P12)) <= (tk(P14)) )) | (! ( ( 17 ) <= (tk(P11)) )) ) & ( (! ( ( 7 ) <= (tk(P9)) )) | (! ( (tk(P12)) <= (tk(P11)) )) ) ) ) ) ) ) | ( ( ( (! ( (tk(P7)) <= (tk(P6)) )) | (! ( (tk(P4)) <= (tk(P1)) )) ) & ( (! ( (tk(P8)) <= ( 1 ) )) | ( (! ( (tk(P13)) <= ( 42 ) )) & (! ( (tk(P1)) <= (tk(P11)) )) ) ) ) | ( ( ( ( 8 ) <= (tk(P9)) ) & (! ( (tk(P12)) <= (tk(P14)) )) ) & ( (! ( (tk(P2)) <= (tk(P7)) )) & (! ( ( 25 ) <= (tk(P1)) )) ) ) ) ) ) )))
FORMULA CircadianClock-PT-000100-ReachabilityCardinality-06 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS

BK_STOP 1678249242993

--------------------
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 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="CircadianClock-PT-000100"
export BK_EXAMINATION="ReachabilityCardinality"
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 CircadianClock-PT-000100, 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 r075-smll-167814400600118"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/CircadianClock-PT-000100.tgz
mv CircadianClock-PT-000100 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 ;