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.r179-tall-171640602200718.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 greatspnxred
Input is HealthRecord-PT-03, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r179-tall-171640602200718
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 524K
-rw-r--r-- 1 mcc users 8.4K May 14 13:22 CTLCardinality.txt
-rw-r--r-- 1 mcc users 99K May 14 13:22 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.2K May 14 13:22 CTLFireability.txt
-rw-r--r-- 1 mcc users 48K May 14 13:22 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.2K Apr 22 14:47 LTLCardinality.txt
-rw-r--r-- 1 mcc users 22K Apr 22 14:47 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Apr 22 14:48 LTLFireability.txt
-rw-r--r-- 1 mcc users 16K Apr 22 14:48 LTLFireability.xml
-rw-r--r-- 1 mcc users 14K Apr 12 20:12 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 160K Apr 12 20:12 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 6.6K Apr 12 20:11 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 52K Apr 12 20:11 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Apr 22 14:48 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K 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 49K 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 HealthRecord-PT-03-ReachabilityCardinality-2024-00
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-01
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-02
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-03
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-04
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-05
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-06
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-07
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-08
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-09
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-10
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-11
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-12
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-13
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-14
FORMULA_NAME HealthRecord-PT-03-ReachabilityCardinality-2024-15

=== Now, execution of the tool begins

BK_START 1716490278085

Invoking MCC driver with
BK_TOOL=greatspnxred
BK_EXAMINATION=ReachabilityCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=HealthRecord-PT-03
BK_MEMORY_CONFINEMENT=16384
Applying reductions before tool greatspn
Invoking reducer
Running Version 202405141337
[2024-05-23 18:51:19] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -timeout, 360, -rebuildPNML]
[2024-05-23 18:51:19] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2024-05-23 18:51:19] [INFO ] Load time of PNML (sax parser for PT used): 65 ms
[2024-05-23 18:51:19] [INFO ] Transformed 121 places.
[2024-05-23 18:51:19] [INFO ] Transformed 232 transitions.
[2024-05-23 18:51:19] [INFO ] Found NUPN structural information;
[2024-05-23 18:51:19] [INFO ] Parsed PT model containing 121 places and 232 transitions and 597 arcs in 160 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 21 ms.
Working with output stream class java.io.PrintStream
Ensure Unique test removed 7 transitions
Reduce redundant transitions removed 7 transitions.
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-01 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-02 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-11 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-12 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-14 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-15 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
RANDOM walk for 40000 steps (2672 resets) in 2237 ms. (17 steps per ms) remains 10/10 properties
BEST_FIRST walk for 40002 steps (386 resets) in 435 ms. (91 steps per ms) remains 10/10 properties
BEST_FIRST walk for 40003 steps (402 resets) in 178 ms. (223 steps per ms) remains 10/10 properties
BEST_FIRST walk for 40003 steps (395 resets) in 145 ms. (273 steps per ms) remains 10/10 properties
BEST_FIRST walk for 40004 steps (413 resets) in 141 ms. (281 steps per ms) remains 10/10 properties
BEST_FIRST walk for 40003 steps (421 resets) in 176 ms. (226 steps per ms) remains 9/10 properties
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-03 FALSE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
BEST_FIRST walk for 40004 steps (364 resets) in 157 ms. (253 steps per ms) remains 9/9 properties
BEST_FIRST walk for 40004 steps (412 resets) in 193 ms. (206 steps per ms) remains 9/9 properties
BEST_FIRST walk for 40003 steps (401 resets) in 452 ms. (88 steps per ms) remains 9/9 properties
BEST_FIRST walk for 40004 steps (405 resets) in 71 ms. (555 steps per ms) remains 9/9 properties
BEST_FIRST walk for 40004 steps (393 resets) in 357 ms. (111 steps per ms) remains 9/9 properties
[2024-05-23 18:51:21] [INFO ] Flow matrix only has 217 transitions (discarded 8 similar events)
// Phase 1: matrix 217 rows 121 cols
[2024-05-23 18:51:21] [INFO ] Computed 14 invariants in 13 ms
[2024-05-23 18:51:21] [INFO ] State equation strengthened by 1 read => feed constraints.
All remaining problems are real, not stopping.
At refinement iteration 0 (INCLUDED_ONLY) 0/82 variables, 82/82 constraints. Problems are: Problem set: 0 solved, 9 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/82 variables, 0/82 constraints. Problems are: Problem set: 0 solved, 9 unsolved
At refinement iteration 2 (OVERLAPS) 22/104 variables, 8/90 constraints. Problems are: Problem set: 0 solved, 9 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/104 variables, 22/112 constraints. Problems are: Problem set: 0 solved, 9 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/104 variables, 0/112 constraints. Problems are: Problem set: 0 solved, 9 unsolved
At refinement iteration 5 (OVERLAPS) 17/121 variables, 6/118 constraints. Problems are: Problem set: 0 solved, 9 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/121 variables, 17/135 constraints. Problems are: Problem set: 0 solved, 9 unsolved
[2024-05-23 18:51:21] [INFO ] Deduced a trap composed of 27 places in 162 ms of which 9 ms to minimize.
Problem HealthRecord-PT-03-ReachabilityCardinality-2024-13 is UNSAT
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-13 FALSE TECHNIQUES SMT_REFINEMENT
At refinement iteration 7 (INCLUDED_ONLY) 0/121 variables, 1/136 constraints. Problems are: Problem set: 1 solved, 8 unsolved
At refinement iteration 8 (INCLUDED_ONLY) 0/121 variables, 0/136 constraints. Problems are: Problem set: 1 solved, 8 unsolved
At refinement iteration 9 (OVERLAPS) 216/337 variables, 121/257 constraints. Problems are: Problem set: 1 solved, 8 unsolved
At refinement iteration 10 (INCLUDED_ONLY) 0/337 variables, 0/257 constraints. Problems are: Problem set: 1 solved, 8 unsolved
At refinement iteration 11 (OVERLAPS) 1/338 variables, 1/258 constraints. Problems are: Problem set: 1 solved, 8 unsolved
At refinement iteration 12 (INCLUDED_ONLY) 0/338 variables, 0/258 constraints. Problems are: Problem set: 1 solved, 8 unsolved
At refinement iteration 13 (OVERLAPS) 0/338 variables, 0/258 constraints. Problems are: Problem set: 1 solved, 8 unsolved
No progress, stopping.
After SMT solving in domain Real declared 338/338 variables, and 258 constraints, problems are : Problem set: 1 solved, 8 unsolved in 848 ms.
Refiners :[Domain max(s): 121/121 constraints, Positive P Invariants (semi-flows): 8/8 constraints, Generalized P Invariants (flows): 6/6 constraints, State Equation: 121/121 constraints, ReadFeed: 1/1 constraints, PredecessorRefiner: 9/9 constraints, Known Traps: 1/1 constraints]
Escalating to Integer solving :Problem set: 1 solved, 8 unsolved
Problem HealthRecord-PT-03-ReachabilityCardinality-2024-09 is UNSAT
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-09 TRUE TECHNIQUES SMT_REFINEMENT
At refinement iteration 0 (INCLUDED_ONLY) 0/76 variables, 76/76 constraints. Problems are: Problem set: 2 solved, 7 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/76 variables, 0/76 constraints. Problems are: Problem set: 2 solved, 7 unsolved
Problem HealthRecord-PT-03-ReachabilityCardinality-2024-00 is UNSAT
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-00 TRUE TECHNIQUES SMT_REFINEMENT
Problem HealthRecord-PT-03-ReachabilityCardinality-2024-05 is UNSAT
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-05 TRUE TECHNIQUES SMT_REFINEMENT
Problem HealthRecord-PT-03-ReachabilityCardinality-2024-06 is UNSAT
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-06 TRUE TECHNIQUES SMT_REFINEMENT
Problem HealthRecord-PT-03-ReachabilityCardinality-2024-07 is UNSAT
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-07 TRUE TECHNIQUES SMT_REFINEMENT
At refinement iteration 2 (OVERLAPS) 25/101 variables, 8/84 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/101 variables, 25/109 constraints. Problems are: Problem set: 6 solved, 3 unsolved
[2024-05-23 18:51:22] [INFO ] Deduced a trap composed of 42 places in 63 ms of which 18 ms to minimize.
[2024-05-23 18:51:22] [INFO ] Deduced a trap composed of 26 places in 103 ms of which 0 ms to minimize.
At refinement iteration 4 (INCLUDED_ONLY) 0/101 variables, 2/111 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 5 (INCLUDED_ONLY) 0/101 variables, 0/111 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 6 (OVERLAPS) 20/121 variables, 6/117 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/121 variables, 20/137 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 8 (INCLUDED_ONLY) 0/121 variables, 1/138 constraints. Problems are: Problem set: 6 solved, 3 unsolved
[2024-05-23 18:51:22] [INFO ] Deduced a trap composed of 35 places in 45 ms of which 1 ms to minimize.
[2024-05-23 18:51:22] [INFO ] Deduced a trap composed of 45 places in 46 ms of which 1 ms to minimize.
[2024-05-23 18:51:22] [INFO ] Deduced a trap composed of 32 places in 51 ms of which 1 ms to minimize.
[2024-05-23 18:51:22] [INFO ] Deduced a trap composed of 38 places in 43 ms of which 1 ms to minimize.
[2024-05-23 18:51:22] [INFO ] Deduced a trap composed of 38 places in 41 ms of which 1 ms to minimize.
At refinement iteration 9 (INCLUDED_ONLY) 0/121 variables, 5/143 constraints. Problems are: Problem set: 6 solved, 3 unsolved
[2024-05-23 18:51:22] [INFO ] Deduced a trap composed of 45 places in 50 ms of which 1 ms to minimize.
[2024-05-23 18:51:22] [INFO ] Deduced a trap composed of 45 places in 50 ms of which 1 ms to minimize.
At refinement iteration 10 (INCLUDED_ONLY) 0/121 variables, 2/145 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 11 (INCLUDED_ONLY) 0/121 variables, 0/145 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 12 (OVERLAPS) 216/337 variables, 121/266 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 13 (INCLUDED_ONLY) 0/337 variables, 3/269 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 14 (INCLUDED_ONLY) 0/337 variables, 0/269 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 15 (OVERLAPS) 1/338 variables, 1/270 constraints. Problems are: Problem set: 6 solved, 3 unsolved
[2024-05-23 18:51:22] [INFO ] Deduced a trap composed of 32 places in 72 ms of which 2 ms to minimize.
[2024-05-23 18:51:23] [INFO ] Deduced a trap composed of 32 places in 56 ms of which 1 ms to minimize.
[2024-05-23 18:51:23] [INFO ] Deduced a trap composed of 44 places in 49 ms of which 1 ms to minimize.
[2024-05-23 18:51:23] [INFO ] Deduced a trap composed of 41 places in 44 ms of which 1 ms to minimize.
[2024-05-23 18:51:23] [INFO ] Deduced a trap composed of 39 places in 47 ms of which 1 ms to minimize.
[2024-05-23 18:51:23] [INFO ] Deduced a trap composed of 40 places in 60 ms of which 1 ms to minimize.
At refinement iteration 16 (INCLUDED_ONLY) 0/338 variables, 6/276 constraints. Problems are: Problem set: 6 solved, 3 unsolved
[2024-05-23 18:51:23] [INFO ] Deduced a trap composed of 40 places in 42 ms of which 1 ms to minimize.
At refinement iteration 17 (INCLUDED_ONLY) 0/338 variables, 1/277 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 18 (INCLUDED_ONLY) 0/338 variables, 0/277 constraints. Problems are: Problem set: 6 solved, 3 unsolved
[2024-05-23 18:51:23] [INFO ] Deduced a trap composed of 39 places in 47 ms of which 1 ms to minimize.
[2024-05-23 18:51:23] [INFO ] Deduced a trap composed of 39 places in 42 ms of which 1 ms to minimize.
At refinement iteration 19 (OVERLAPS) 0/338 variables, 2/279 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 20 (INCLUDED_ONLY) 0/338 variables, 0/279 constraints. Problems are: Problem set: 6 solved, 3 unsolved
At refinement iteration 21 (OVERLAPS) 0/338 variables, 0/279 constraints. Problems are: Problem set: 6 solved, 3 unsolved
No progress, stopping.
After SMT solving in domain Int declared 338/338 variables, and 279 constraints, problems are : Problem set: 6 solved, 3 unsolved in 1653 ms.
Refiners :[Domain max(s): 121/121 constraints, Positive P Invariants (semi-flows): 8/8 constraints, Generalized P Invariants (flows): 6/6 constraints, State Equation: 121/121 constraints, ReadFeed: 1/1 constraints, PredecessorRefiner: 3/9 constraints, Known Traps: 19/19 constraints]
After SMT, in 2717ms problems are : Problem set: 6 solved, 3 unsolved
Fused 3 Parikh solutions to 2 different solutions.
Finished Parikh walk after 315 steps, including 12 resets, run visited all 3 properties in 4 ms. (steps per millisecond=78 )
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-10 TRUE TECHNIQUES PARIKH_WALK
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-08 TRUE TECHNIQUES PARIKH_WALK
FORMULA HealthRecord-PT-03-ReachabilityCardinality-2024-04 FALSE TECHNIQUES PARIKH_WALK
Finished Parikh walk after 0 steps, including 0 resets, run visited all 0 properties in 1 ms. (steps per millisecond=0 )
Parikh walk visited 3 properties in 9 ms.
All properties solved without resorting to model-checking.
Total runtime 4542 ms.
ITS solved all properties within timeout

BK_STOP 1716490283803

--------------------
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//
++ ls /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202405141337.jar
++ perl -pe 's/.*\.//g'
+ VERSION=202405141337
+ echo 'Running Version 202405141337'
+ /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="HealthRecord-PT-03"
export BK_EXAMINATION="ReachabilityCardinality"
export BK_TOOL="greatspnxred"
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 greatspnxred"
echo " Input is HealthRecord-PT-03, 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 r179-tall-171640602200718"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/HealthRecord-PT-03.tgz
mv HealthRecord-PT-03 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 ;