fond
Model Checking Contest 2024
14th edition, Geneva, Switzerland, June 25, 2024
Execution of r202-smll-171649587400063
Last Updated
July 7, 2024

About the Execution of ITS-Tools for HirschbergSinclair-PT-05

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
270.283 4990.00 14346.00 119.70 TTFTFTTFTFFTTFFT normal

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.r202-smll-171649587400063.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 itstools
Input is HirschbergSinclair-PT-05, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r202-smll-171649587400063
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 624K
-rw-r--r-- 1 mcc users 12K May 14 13:22 CTLCardinality.txt
-rw-r--r-- 1 mcc users 92K May 14 13:22 CTLCardinality.xml
-rw-r--r-- 1 mcc users 7.9K May 14 13:22 CTLFireability.txt
-rw-r--r-- 1 mcc users 52K May 14 13:22 CTLFireability.xml
-rw-r--r-- 1 mcc users 5.4K Apr 22 14:48 LTLCardinality.txt
-rw-r--r-- 1 mcc users 30K Apr 22 14:48 LTLCardinality.xml
-rw-r--r-- 1 mcc users 3.4K Apr 22 14:48 LTLFireability.txt
-rw-r--r-- 1 mcc users 21K Apr 22 14:48 LTLFireability.xml
-rw-r--r-- 1 mcc users 17K Apr 13 03:03 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 125K Apr 13 03:03 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.9K Apr 13 03:02 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 51K Apr 13 03:02 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 2.0K Apr 22 14:48 UpperBounds.txt
-rw-r--r-- 1 mcc users 4.0K Apr 22 14:48 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 18 16:42 equiv_col
-rw-r--r-- 1 mcc users 3 May 18 16:42 instance
-rw-r--r-- 1 mcc users 6 May 18 16:42 iscolored
-rw-r--r-- 1 mcc users 157K May 18 16:42 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 HirschbergSinclair-PT-05-ReachabilityFireability-2024-00
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-01
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-02
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-03
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-04
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-05
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-06
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-07
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-08
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-09
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-10
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-11
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-12
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-13
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-14
FORMULA_NAME HirschbergSinclair-PT-05-ReachabilityFireability-2024-15

=== Now, execution of the tool begins

BK_START 1716581544476

Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=ReachabilityFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=HirschbergSinclair-PT-05
BK_MEMORY_CONFINEMENT=16384
Not applying reductions.
Model is PT
ReachabilityFireability PT
Running Version 202405141337
[2024-05-24 20:12:26] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2024-05-24 20:12:26] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2024-05-24 20:12:26] [INFO ] Load time of PNML (sax parser for PT used): 207 ms
[2024-05-24 20:12:26] [INFO ] Transformed 124 places.
[2024-05-24 20:12:26] [INFO ] Transformed 111 transitions.
[2024-05-24 20:12:26] [INFO ] Parsed PT model containing 124 places and 111 transitions and 340 arcs in 368 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 133 ms.
Working with output stream class java.io.PrintStream
[2024-05-24 20:12:27] [INFO ] Flatten gal took : 126 ms
[2024-05-24 20:12:27] [INFO ] Flatten gal took : 45 ms
[2024-05-24 20:12:27] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality17830142523557722873.gal : 54 ms
RANDOM walk for 40000 steps (360 resets) in 2126 ms. (18 steps per ms) remains 4/16 properties
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-15 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-14 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-13 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-12 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-11 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-10 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-07 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-05 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-03 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-02 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-01 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-00 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
[2024-05-24 20:12:27] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality453670809336961263.prop : 3 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202405141337/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality17830142523557722873.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality453670809336961263.prop' '--nowitness' '--gen-order' 'FOLLOW'

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202405141337/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...328
Loading property file /tmp/ReachabilityCardinality453670809336961263.prop.
BEST_FIRST walk for 40003 steps (104 resets) in 518 ms. (77 steps per ms) remains 4/4 properties
SDD proceeding with computation,4 properties remain. new max is 4
SDD size :1 after 2
SDD proceeding with computation,4 properties remain. new max is 8
SDD size :2 after 6
SDD proceeding with computation,4 properties remain. new max is 16
SDD size :6 after 15
SDD proceeding with computation,4 properties remain. new max is 32
SDD size :15 after 17
SDD proceeding with computation,4 properties remain. new max is 64
SDD size :17 after 69
SDD proceeding with computation,4 properties remain. new max is 128
SDD size :69 after 726
SDD proceeding with computation,4 properties remain. new max is 256
SDD size :726 after 5730
BEST_FIRST walk for 40002 steps (98 resets) in 298 ms. (133 steps per ms) remains 4/4 properties
SDD proceeding with computation,4 properties remain. new max is 512
SDD size :5730 after 317958
SDD proceeding with computation,4 properties remain. new max is 1024
SDD size :317958 after 482549
BEST_FIRST walk for 40003 steps (103 resets) in 295 ms. (135 steps per ms) remains 4/4 properties
BEST_FIRST walk for 40004 steps (102 resets) in 150 ms. (264 steps per ms) remains 4/4 properties
// Phase 1: matrix 111 rows 124 cols
[2024-05-24 20:12:28] [INFO ] Computed 13 invariants in 24 ms
At refinement iteration 0 (INCLUDED_ONLY) 0/39 variables, 0/0 constraints. Problems are: Problem set: 0 solved, 4 unsolved
Problem HirschbergSinclair-PT-05-ReachabilityFireability-2024-08 is UNSAT
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-08 TRUE TECHNIQUES SMT_REFINEMENT
At refinement iteration 1 (OVERLAPS) 73/112 variables, 10/10 constraints. Problems are: Problem set: 1 solved, 3 unsolved
At refinement iteration 2 (INCLUDED_ONLY) 0/112 variables, 0/10 constraints. Problems are: Problem set: 1 solved, 3 unsolved
Problem HirschbergSinclair-PT-05-ReachabilityFireability-2024-06 is UNSAT
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-06 TRUE TECHNIQUES SMT_REFINEMENT
Problem HirschbergSinclair-PT-05-ReachabilityFireability-2024-09 is UNSAT
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-09 FALSE TECHNIQUES SMT_REFINEMENT
All remaining problems are real, not stopping.
At refinement iteration 3 (OVERLAPS) 8/120 variables, 3/13 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/120 variables, 0/13 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 5 (OVERLAPS) 111/231 variables, 120/133 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/231 variables, 0/133 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 7 (OVERLAPS) 4/235 variables, 4/137 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 8 (INCLUDED_ONLY) 0/235 variables, 0/137 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 9 (OVERLAPS) 0/235 variables, 0/137 constraints. Problems are: Problem set: 3 solved, 1 unsolved
No progress, stopping.
After SMT solving in domain Real declared 235/235 variables, and 137 constraints, problems are : Problem set: 3 solved, 1 unsolved in 437 ms.
Refiners :[Positive P Invariants (semi-flows): 10/10 constraints, Generalized P Invariants (flows): 3/3 constraints, State Equation: 124/124 constraints, PredecessorRefiner: 4/4 constraints, Known Traps: 0/0 constraints]
Escalating to Integer solving :Problem set: 3 solved, 1 unsolved
At refinement iteration 0 (INCLUDED_ONLY) 0/17 variables, 0/0 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 1 (OVERLAPS) 94/111 variables, 10/10 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 2 (INCLUDED_ONLY) 0/111 variables, 0/10 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 3 (OVERLAPS) 9/120 variables, 3/13 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/120 variables, 0/13 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 5 (OVERLAPS) 111/231 variables, 120/133 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/231 variables, 0/133 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 7 (OVERLAPS) 4/235 variables, 4/137 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 8 (INCLUDED_ONLY) 0/235 variables, 1/138 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 9 (INCLUDED_ONLY) 0/235 variables, 0/138 constraints. Problems are: Problem set: 3 solved, 1 unsolved
At refinement iteration 10 (OVERLAPS) 0/235 variables, 0/138 constraints. Problems are: Problem set: 3 solved, 1 unsolved
No progress, stopping.
After SMT solving in domain Int declared 235/235 variables, and 138 constraints, problems are : Problem set: 3 solved, 1 unsolved in 256 ms.
Refiners :[Positive P Invariants (semi-flows): 10/10 constraints, Generalized P Invariants (flows): 3/3 constraints, State Equation: 124/124 constraints, PredecessorRefiner: 1/4 constraints, Known Traps: 0/0 constraints]
After SMT, in 826ms problems are : Problem set: 3 solved, 1 unsolved
Parikh walk visited 0 properties in 28 ms.
Support contains 17 out of 124 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 124/124 places, 111/111 transitions.
Graph (complete) has 236 edges and 124 vertex of which 119 are kept as prefixes of interest. Removing 5 places using SCC suffix rule.2 ms
Discarding 5 places :
Also discarding 0 output transitions
Drop transitions (Trivial Post-Agglo cleanup.) removed 17 transitions
Trivial Post-agglo rules discarded 17 transitions
Performed 17 trivial Post agglomeration. Transition count delta: 17
Iterating post reduction 0 with 17 rules applied. Total rules applied 18 place count 119 transition count 94
Reduce places removed 17 places and 0 transitions.
Graph (complete) has 185 edges and 102 vertex of which 98 are kept as prefixes of interest. Removing 4 places using SCC suffix rule.0 ms
Discarding 4 places :
Also discarding 0 output transitions
Iterating post reduction 1 with 18 rules applied. Total rules applied 36 place count 98 transition count 94
Drop transitions (Empty/Sink Transition effects.) removed 4 transitions
Reduce isomorphic transitions removed 4 transitions.
Iterating post reduction 2 with 4 rules applied. Total rules applied 40 place count 98 transition count 90
Discarding 3 places :
Symmetric choice reduction at 3 with 3 rule applications. Total rules 43 place count 95 transition count 87
Iterating global reduction 3 with 3 rules applied. Total rules applied 46 place count 95 transition count 87
Discarding 1 places :
Symmetric choice reduction at 3 with 1 rule applications. Total rules 47 place count 94 transition count 86
Iterating global reduction 3 with 1 rules applied. Total rules applied 48 place count 94 transition count 86
Free-agglomeration rule (complex) applied 2 times.
Iterating global reduction 3 with 2 rules applied. Total rules applied 50 place count 94 transition count 84
Reduce places removed 2 places and 0 transitions.
Iterating post reduction 3 with 2 rules applied. Total rules applied 52 place count 92 transition count 84
Reduce places removed 1 places and 1 transitions.
Iterating global reduction 4 with 1 rules applied. Total rules applied 53 place count 91 transition count 83
Applied a total of 53 rules in 106 ms. Remains 91 /124 variables (removed 33) and now considering 83/111 (removed 28) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 123 ms. Remains : 91/124 places, 83/111 transitions.
RANDOM walk for 40000 steps (460 resets) in 505 ms. (79 steps per ms) remains 1/1 properties
BEST_FIRST walk for 40004 steps (148 resets) in 256 ms. (155 steps per ms) remains 1/1 properties
Finished probabilistic random walk after 10145 steps, run visited all 1 properties in 81 ms. (steps per millisecond=125 )
Probabilistic random walk after 10145 steps, saw 2847 distinct states, run finished after 88 ms. (steps per millisecond=115 ) properties seen :1
FORMULA HirschbergSinclair-PT-05-ReachabilityFireability-2024-04 FALSE TECHNIQUES TOPOLOGICAL PROBABILISTIC_WALK
ITS runner timed out or was interrupted.
ITS tools runner thread asked to quit. Dying gracefully.
All properties solved without resorting to model-checking.
Total runtime 3285 ms.

BK_STOP 1716581549466

--------------------
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
+ [[ ReachabilityFireability = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution ReachabilityFireability -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
+ 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//../itstools/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202405141337.jar
+ VERSION=202405141337
+ echo 'Running Version 202405141337'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityFireability -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-05"
export BK_EXAMINATION="ReachabilityFireability"
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 2-5568"
echo " Executing tool itstools"
echo " Input is HirschbergSinclair-PT-05, 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 r202-smll-171649587400063"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/HirschbergSinclair-PT-05.tgz
mv HirschbergSinclair-PT-05 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 ;