fond
Model Checking Contest 2023
13th edition, Paris, France, April 26, 2023 (at TOOLympics II)
Execution of r107-tall-167814483900191
Last Updated
May 14, 2023

About the Execution of Smart+red for DBSingleClientW-PT-d0m05

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
369.840 21412.00 32957.00 305.30 TTFTTFFFTFFFTTFF 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.r107-tall-167814483900191.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 DBSingleClientW-PT-d0m05, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r107-tall-167814483900191
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 620K
-rw-r--r-- 1 mcc users 8.5K Feb 26 15:17 CTLCardinality.txt
-rw-r--r-- 1 mcc users 96K Feb 26 15:17 CTLCardinality.xml
-rw-r--r-- 1 mcc users 4.8K Feb 26 15:16 CTLFireability.txt
-rw-r--r-- 1 mcc users 40K Feb 26 15:16 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.6K Feb 25 15:48 LTLCardinality.txt
-rw-r--r-- 1 mcc users 24K Feb 25 15:48 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K Feb 25 15:48 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Feb 25 15:48 LTLFireability.xml
-rw-r--r-- 1 mcc users 14K Feb 26 15:18 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 153K Feb 26 15:18 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 9.8K Feb 26 15:17 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 88K Feb 26 15:17 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Feb 25 15:48 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.8K Feb 25 15:48 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 equiv_col
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 119K 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 DBSingleClientW-PT-d0m05-ReachabilityFireability-00
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-01
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-02
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-03
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-04
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-05
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-06
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-07
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-08
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-09
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-10
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-11
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-12
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-13
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-14
FORMULA_NAME DBSingleClientW-PT-d0m05-ReachabilityFireability-15

=== Now, execution of the tool begins

BK_START 1678344200132

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=ReachabilityFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=DBSingleClientW-PT-d0m05
Applying reductions before tool smart
Invoking reducer
Running Version 202303021504
[2023-03-09 06:43:21] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -timeout, 360, -rebuildPNML]
[2023-03-09 06:43:21] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-09 06:43:21] [INFO ] Load time of PNML (sax parser for PT used): 55 ms
[2023-03-09 06:43:21] [INFO ] Transformed 553 places.
[2023-03-09 06:43:21] [INFO ] Transformed 150 transitions.
[2023-03-09 06:43:21] [INFO ] Parsed PT model containing 553 places and 150 transitions and 600 arcs in 115 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 12 ms.
Working with output stream class java.io.PrintStream
Deduced a syphon composed of 444 places in 2 ms
Reduce places removed 444 places and 0 transitions.
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-09 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-11 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Incomplete random walk after 10000 steps, including 2285 resets, run finished after 356 ms. (steps per millisecond=28 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10000 steps, including 514 resets, run finished after 92 ms. (steps per millisecond=108 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10000 steps, including 1250 resets, run finished after 117 ms. (steps per millisecond=85 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10001 steps, including 505 resets, run finished after 74 ms. (steps per millisecond=135 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10001 steps, including 477 resets, run finished after 105 ms. (steps per millisecond=95 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10000 steps, including 538 resets, run finished after 77 ms. (steps per millisecond=129 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10001 steps, including 505 resets, run finished after 87 ms. (steps per millisecond=114 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10000 steps, including 519 resets, run finished after 76 ms. (steps per millisecond=131 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10001 steps, including 511 resets, run finished after 72 ms. (steps per millisecond=138 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10000 steps, including 496 resets, run finished after 67 ms. (steps per millisecond=149 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10001 steps, including 506 resets, run finished after 59 ms. (steps per millisecond=169 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10001 steps, including 492 resets, run finished after 73 ms. (steps per millisecond=137 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10000 steps, including 499 resets, run finished after 68 ms. (steps per millisecond=147 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10000 steps, including 2000 resets, run finished after 119 ms. (steps per millisecond=84 ) properties (out of 14) seen :0
Incomplete Best-First random walk after 10001 steps, including 476 resets, run finished after 57 ms. (steps per millisecond=175 ) properties (out of 14) seen :0
Interrupted probabilistic random walk after 491249 steps, run timeout after 3001 ms. (steps per millisecond=163 ) properties seen :{1=1, 2=1, 3=1, 4=1, 7=1, 8=1, 10=1, 11=1, 12=1}
Probabilistic random walk after 491249 steps, saw 179812 distinct states, run finished after 3002 ms. (steps per millisecond=163 ) properties seen :9
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-14 FALSE TECHNIQUES TOPOLOGICAL PROBABILISTIC_WALK
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-13 TRUE TECHNIQUES TOPOLOGICAL PROBABILISTIC_WALK
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-12 TRUE TECHNIQUES TOPOLOGICAL PROBABILISTIC_WALK
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-08 TRUE TECHNIQUES TOPOLOGICAL PROBABILISTIC_WALK
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-07 FALSE TECHNIQUES TOPOLOGICAL PROBABILISTIC_WALK
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-04 TRUE TECHNIQUES TOPOLOGICAL PROBABILISTIC_WALK
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-03 TRUE TECHNIQUES TOPOLOGICAL PROBABILISTIC_WALK
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-02 FALSE TECHNIQUES TOPOLOGICAL PROBABILISTIC_WALK
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-01 TRUE TECHNIQUES TOPOLOGICAL PROBABILISTIC_WALK
Running SMT prover for 5 properties.
// Phase 1: matrix 150 rows 109 cols
[2023-03-09 06:43:26] [INFO ] Computed 6 place invariants in 14 ms
[2023-03-09 06:43:26] [INFO ] [Real]Absence check using 2 positive place invariants in 2 ms returned sat
[2023-03-09 06:43:26] [INFO ] [Real]Absence check using 2 positive and 4 generalized place invariants in 3 ms returned sat
[2023-03-09 06:43:26] [INFO ] After 191ms SMT Verify possible using all constraints in real domain returned unsat :1 sat :0 real:4
[2023-03-09 06:43:26] [INFO ] [Nat]Absence check using 2 positive place invariants in 2 ms returned sat
[2023-03-09 06:43:26] [INFO ] [Nat]Absence check using 2 positive and 4 generalized place invariants in 3 ms returned sat
[2023-03-09 06:43:26] [INFO ] After 55ms SMT Verify possible using state equation in natural domain returned unsat :4 sat :1
[2023-03-09 06:43:26] [INFO ] State equation strengthened by 74 read => feed constraints.
[2023-03-09 06:43:26] [INFO ] After 38ms SMT Verify possible using 74 Read/Feed constraints in natural domain returned unsat :4 sat :1
[2023-03-09 06:43:26] [INFO ] After 67ms SMT Verify possible using trap constraints in natural domain returned unsat :4 sat :1
Attempting to minimize the solution found.
Minimization took 22 ms.
[2023-03-09 06:43:26] [INFO ] After 212ms SMT Verify possible using all constraints in natural domain returned unsat :4 sat :1
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-15 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-06 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-05 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-00 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
Fused 5 Parikh solutions to 1 different solutions.
Parikh walk visited 0 properties in 3 ms.
Support contains 4 out of 109 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 109/109 places, 150/150 transitions.
Graph (complete) has 332 edges and 109 vertex of which 101 are kept as prefixes of interest. Removing 8 places using SCC suffix rule.1 ms
Discarding 8 places :
Also discarding 0 output transitions
Drop transitions removed 2 transitions
Ensure Unique test removed 11 transitions
Reduce isomorphic transitions removed 13 transitions.
Iterating post reduction 0 with 13 rules applied. Total rules applied 14 place count 101 transition count 137
Discarding 21 places :
Symmetric choice reduction at 1 with 21 rule applications. Total rules 35 place count 80 transition count 100
Iterating global reduction 1 with 21 rules applied. Total rules applied 56 place count 80 transition count 100
Ensure Unique test removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Iterating post reduction 1 with 1 rules applied. Total rules applied 57 place count 80 transition count 99
Discarding 10 places :
Symmetric choice reduction at 2 with 10 rule applications. Total rules 67 place count 70 transition count 89
Iterating global reduction 2 with 10 rules applied. Total rules applied 77 place count 70 transition count 89
Ensure Unique test removed 2 transitions
Reduce isomorphic transitions removed 2 transitions.
Iterating post reduction 2 with 2 rules applied. Total rules applied 79 place count 70 transition count 87
Discarding 1 places :
Symmetric choice reduction at 3 with 1 rule applications. Total rules 80 place count 69 transition count 85
Iterating global reduction 3 with 1 rules applied. Total rules applied 81 place count 69 transition count 85
Ensure Unique test removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Iterating post reduction 3 with 1 rules applied. Total rules applied 82 place count 69 transition count 84
Applied a total of 82 rules in 30 ms. Remains 69 /109 variables (removed 40) and now considering 84/150 (removed 66) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 30 ms. Remains : 69/109 places, 84/150 transitions.
Incomplete random walk after 10000 steps, including 2320 resets, run finished after 15 ms. (steps per millisecond=666 ) properties (out of 1) seen :0
Incomplete Best-First random walk after 10001 steps, including 506 resets, run finished after 6 ms. (steps per millisecond=1666 ) properties (out of 1) seen :0
Probably explored full state space saw : 63810 states, properties seen :0
Probabilistic random walk after 165193 steps, saw 63810 distinct states, run finished after 142 ms. (steps per millisecond=1163 ) properties seen :0
Explored full state space saw : 64084 states, properties seen :0
Exhaustive walk after 165622 steps, saw 64084 distinct states, run finished after 106 ms. (steps per millisecond=1562 ) properties seen :0
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-10 FALSE TECHNIQUES TOPOLOGICAL EXHAUSTIVE_WALK
All properties solved without resorting to model-checking.
Total runtime 5499 ms.
======================================================
========== this is Smart for the MCC'2018 ============
======================================================
Running DBSingleClientW (PT), instance d0m05
Examination ReachabilityFireability
Parser /home/mcc/BenchKit/bin//../reducer/bin//../../smart/bin//parser/Fireability.jar
Model checker /home/mcc/BenchKit/bin//../reducer/bin//../../smart/bin//rem_exec//smart

GOT IT HERE. BS
Petri model created: 553 places, 150 transitions, 600 arcs.
Final Score: 2690.467
Took : 10 seconds
Reachability Fireability file is: ReachabilityFireability.xml
READY TO PARSE. BS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-00 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-01 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-02 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-03 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-04 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-05 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-06 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-07 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-08 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-09 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-10 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-11 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-12 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-13 TRUE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-14 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS
FORMULA DBSingleClientW-PT-d0m05-ReachabilityFireability-15 FALSE TECHNIQUES SEQUENTIAL_PROCESSING DECISION_DIAGRAMS

BK_STOP 1678344221544

--------------------
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 ReachabilityFireability -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="DBSingleClientW-PT-d0m05"
export BK_EXAMINATION="ReachabilityFireability"
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 DBSingleClientW-PT-d0m05, examination is ReachabilityFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r107-tall-167814483900191"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/DBSingleClientW-PT-d0m05.tgz
mv DBSingleClientW-PT-d0m05 execution
cd execution
if [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "UpperBounds" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] || [ "ReachabilityFireability" = "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 [ "ReachabilityFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityFireability" != "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 "ReachabilityFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property ReachabilityFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "ReachabilityFireability.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 '' ReachabilityFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityFireability"
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 ;