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.r357-smll-167891806200310.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 itstools
Input is SatelliteMemory-PT-X01000Y0032, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r357-smll-167891806200310
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 488K
-rw-r--r-- 1 mcc users 6.5K Feb 26 12:48 CTLCardinality.txt
-rw-r--r-- 1 mcc users 66K Feb 26 12:48 CTLCardinality.xml
-rw-r--r-- 1 mcc users 4.9K Feb 26 12:42 CTLFireability.txt
-rw-r--r-- 1 mcc users 43K Feb 26 12:42 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:41 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 7.2K Jan 29 11:41 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 3.6K Feb 25 16:50 LTLCardinality.txt
-rw-r--r-- 1 mcc users 25K Feb 25 16:50 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K Feb 25 16:50 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Feb 25 16:50 LTLFireability.xml
-rw-r--r-- 1 mcc users 14K Feb 26 12:51 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 155K Feb 26 12:51 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.2K Feb 26 12:50 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 74K Feb 26 12:50 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.8K Feb 25 16:50 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.8K Feb 25 16:50 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 equiv_col
-rw-r--r-- 1 mcc users 12 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 iscolored
-rwxr-xr-x 1 mcc users 5.5K Mar 5 18:23 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 SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-00
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-01
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-02
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-03
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-04
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-05
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-06
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-07
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-08
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-09
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-10
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-11
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-12
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-13
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-14
FORMULA_NAME SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-15

=== Now, execution of the tool begins

BK_START 1679111333115

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=itstools
BK_EXAMINATION=ReachabilityCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=SatelliteMemory-PT-X01000Y0032
Not applying reductions.
Model is PT
ReachabilityCardinality PT
Running Version 202303021504
[2023-03-18 03:48:55] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2023-03-18 03:48:55] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-18 03:48:56] [INFO ] Load time of PNML (sax parser for PT used): 44 ms
[2023-03-18 03:48:56] [INFO ] Transformed 13 places.
[2023-03-18 03:48:56] [INFO ] Transformed 10 transitions.
[2023-03-18 03:48:56] [INFO ] Parsed PT model containing 13 places and 10 transitions and 40 arcs in 172 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 44 ms.
Working with output stream class java.io.PrintStream
Reduce places removed 1 places and 0 transitions.
[2023-03-18 03:48:56] [INFO ] Flatten gal took : 26 ms
[2023-03-18 03:48:56] [INFO ] Flatten gal took : 6 ms
[2023-03-18 03:48:56] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality8101172698677850836.gal : 5 ms
[2023-03-18 03:48:56] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality997693106643579466.prop : 106 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202303021504/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality8101172698677850836.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality997693106643579466.prop' '--nowitness' '--gen-order' 'FOLLOW'

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202303021504/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...327
Loading property file /tmp/ReachabilityCardinality997693106643579466.prop.
SDD proceeding with computation,16 properties remain. new max is 4
SDD size :1 after 5
SDD proceeding with computation,16 properties remain. new max is 8
SDD size :5 after 10
SDD proceeding with computation,16 properties remain. new max is 16
SDD size :10 after 19
SDD proceeding with computation,16 properties remain. new max is 32
SDD size :19 after 36
SDD proceeding with computation,16 properties remain. new max is 64
SDD size :36 after 69
SDD proceeding with computation,16 properties remain. new max is 128
SDD size :69 after 134
SDD proceeding with computation,16 properties remain. new max is 256
SDD size :134 after 263
Reachability property SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-08 is true.
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-08 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
SDD proceeding with computation,15 properties remain. new max is 256
SDD size :263 after 520
Incomplete random walk after 10000 steps, including 2 resets, run finished after 852 ms. (steps per millisecond=11 ) properties (out of 16) seen :5
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-09 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-06 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-05 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-03 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Incomplete Best-First random walk after 10000 steps, including 2 resets, run finished after 120 ms. (steps per millisecond=83 ) properties (out of 11) seen :0
SDD proceeding with computation,15 properties remain. new max is 512
SDD size :520 after 777
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 138 ms. (steps per millisecond=72 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 198 ms. (steps per millisecond=50 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 165 ms. (steps per millisecond=60 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 109 ms. (steps per millisecond=91 ) properties (out of 11) seen :0
SDD proceeding with computation,15 properties remain. new max is 1024
SDD size :777 after 1290
Incomplete Best-First random walk after 10000 steps, including 2 resets, run finished after 152 ms. (steps per millisecond=65 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 105 ms. (steps per millisecond=95 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10000 steps, including 2 resets, run finished after 103 ms. (steps per millisecond=97 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 114 ms. (steps per millisecond=87 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10000 steps, including 2 resets, run finished after 99 ms. (steps per millisecond=101 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 135 ms. (steps per millisecond=74 ) properties (out of 11) seen :0
Running SMT prover for 11 properties.
// Phase 1: matrix 10 rows 12 cols
[2023-03-18 03:48:58] [INFO ] Computed 6 place invariants in 4 ms
[2023-03-18 03:48:58] [INFO ] [Real]Absence check using 6 positive place invariants in 5 ms returned sat
[2023-03-18 03:48:58] [INFO ] After 251ms SMT Verify possible using all constraints in real domain returned unsat :2 sat :0 real:9
[2023-03-18 03:48:58] [INFO ] [Nat]Absence check using 6 positive place invariants in 2 ms returned sat
[2023-03-18 03:48:59] [INFO ] After 381ms SMT Verify possible using state equation in natural domain returned unsat :5 sat :6
[2023-03-18 03:48:59] [INFO ] State equation strengthened by 1 read => feed constraints.
[2023-03-18 03:48:59] [INFO ] After 117ms SMT Verify possible using 1 Read/Feed constraints in natural domain returned unsat :5 sat :6
[2023-03-18 03:48:59] [INFO ] After 222ms SMT Verify possible using trap constraints in natural domain returned unsat :5 sat :6
Attempting to minimize the solution found.
Minimization took 100 ms.
[2023-03-18 03:48:59] [INFO ] After 791ms SMT Verify possible using all constraints in natural domain returned unsat :5 sat :6
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-11 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-07 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-04 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-02 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-00 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
Fused 11 Parikh solutions to 6 different solutions.
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-01 TRUE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-15 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-13 TRUE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-10 TRUE TECHNIQUES TOPOLOGICAL PARIKH_WALK
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-14 FALSE TECHNIQUES TOPOLOGICAL PARIKH_WALK
Parikh walk visited 5 properties in 819 ms.
Support contains 11 out of 12 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 12/12 places, 10/10 transitions.
Applied a total of 0 rules in 16 ms. Remains 12 /12 variables (removed 0) and now considering 10/10 (removed 0) transitions.
[2023-03-18 03:49:00] [INFO ] Invariant cache hit.
[2023-03-18 03:49:00] [INFO ] Dead Transitions using invariants and state equation in 84 ms found 0 transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 101 ms. Remains : 12/12 places, 10/10 transitions.
Incomplete random walk after 10000 steps, including 2 resets, run finished after 19 ms. (steps per millisecond=526 ) properties (out of 1) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 25 ms. (steps per millisecond=400 ) properties (out of 1) seen :0
Invariant property SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-15 does not hold.
Invariant property SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-14 does not hold.
Reachability property SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-13 is true.
Interrupted probabilistic random walk after 2819473 steps, run timeout after 3001 ms. (steps per millisecond=939 ) properties seen :{}
Probabilistic random walk after 2819473 steps, saw 949306 distinct states, run finished after 3006 ms. (steps per millisecond=937 ) properties seen :0
Running SMT prover for 1 properties.
[2023-03-18 03:49:03] [INFO ] Invariant cache hit.
[2023-03-18 03:49:03] [INFO ] After 31ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:1
[2023-03-18 03:49:03] [INFO ] [Nat]Absence check using 6 positive place invariants in 2 ms returned sat
Reachability property SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-10 is true.
Reachability property SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-09 is true.
[2023-03-18 03:49:05] [INFO ] After 1462ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :1
[2023-03-18 03:49:05] [INFO ] State equation strengthened by 1 read => feed constraints.
[2023-03-18 03:49:05] [INFO ] After 135ms SMT Verify possible using 1 Read/Feed constraints in natural domain returned unsat :0 sat :1
[2023-03-18 03:49:05] [INFO ] After 156ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :1
Attempting to minimize the solution found.
Minimization took 10 ms.
[2023-03-18 03:49:05] [INFO ] After 1668ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :1
Finished Parikh walk after 2137 steps, including 0 resets, run visited all 1 properties in 3 ms. (steps per millisecond=712 )
FORMULA SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-12 TRUE TECHNIQUES TOPOLOGICAL PARIKH_WALK
Parikh walk visited 1 properties in 4 ms.
ITS runner failed with exception null
java.lang.InterruptedException
at java.base/java.lang.Object.wait(Native Method)
at java.base/java.lang.Thread.join(Thread.java:1304)
at java.base/java.lang.Thread.join(Thread.java:1372)
at fr.lip6.move.gal.application.runner.AbstractRunner.join(AbstractRunner.java:27)
at fr.lip6.move.gal.application.runner.its.ITSRunner.join(ITSRunner.java:177)
at fr.lip6.move.gal.application.solver.global.GlobalPropertySolver.verifyWithSDD(GlobalPropertySolver.java:675)
at fr.lip6.move.gal.application.solver.ReachabilitySolver.lambda$2(ReachabilitySolver.java:63)
at java.base/java.lang.Thread.run(Thread.java:833)
All properties solved without resorting to model-checking.
Total runtime 9445 ms.
Invariant property SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-06 does not hold.
Invariant property SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-05 does not hold.
Invariant property SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-03 does not hold.
Reachability property SatelliteMemory-PT-X01000Y0032-ReachabilityCardinality-01 is true.
SDD proceeding with computation,6 properties remain. new max is 1024
SDD size :331523 after 337143

BK_STOP 1679111346687

--------------------
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
+ [[ ReachabilityCardinality = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution ReachabilityCardinality -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_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityCardinality -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="SatelliteMemory-PT-X01000Y0032"
export BK_EXAMINATION="ReachabilityCardinality"
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 2-5348"
echo " Executing tool itstools"
echo " Input is SatelliteMemory-PT-X01000Y0032, 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 r357-smll-167891806200310"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/SatelliteMemory-PT-X01000Y0032.tgz
mv SatelliteMemory-PT-X01000Y0032 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 ;