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.r025-smll-171620166400327.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 AutonomousCar-PT-07b, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r025-smll-171620166400327
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 804K
-rw-r--r-- 1 mcc users 7.1K May 14 13:22 CTLCardinality.txt
-rw-r--r-- 1 mcc users 77K May 14 13:22 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.1K May 14 13:22 CTLFireability.txt
-rw-r--r-- 1 mcc users 46K May 14 13:22 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.5K May 19 07:06 LTLCardinality.txt
-rw-r--r-- 1 mcc users 25K May 19 15:27 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K Apr 22 14:29 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Apr 22 14:29 LTLFireability.xml
-rw-r--r-- 1 mcc users 13K Apr 12 17:49 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 135K Apr 12 17:49 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 9.3K Apr 12 17:49 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 82K Apr 12 17:49 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Apr 22 14:29 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Apr 22 14:29 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 18 16:42 equiv_col
-rw-r--r-- 1 mcc users 4 May 18 16:42 instance
-rw-r--r-- 1 mcc users 6 May 18 16:42 iscolored
-rw-r--r-- 1 mcc users 334K 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 AutonomousCar-PT-07b-ReachabilityFireability-2024-00
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-01
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-02
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-03
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-04
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-05
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-06
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-07
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-08
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-09
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-10
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-11
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-12
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-13
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-14
FORMULA_NAME AutonomousCar-PT-07b-ReachabilityFireability-2024-15

=== Now, execution of the tool begins

BK_START 1716352886296

Invoking MCC driver with
BK_TOOL=greatspnxred
BK_EXAMINATION=ReachabilityFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=AutonomousCar-PT-07b
BK_MEMORY_CONFINEMENT=16384
Applying reductions before tool greatspn
Invoking reducer
Running Version 202405141337
[2024-05-22 04:41:28] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -timeout, 360, -rebuildPNML]
[2024-05-22 04:41:28] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2024-05-22 04:41:28] [INFO ] Load time of PNML (sax parser for PT used): 504 ms
[2024-05-22 04:41:28] [INFO ] Transformed 323 places.
[2024-05-22 04:41:28] [INFO ] Transformed 846 transitions.
[2024-05-22 04:41:28] [INFO ] Found NUPN structural information;
[2024-05-22 04:41:28] [INFO ] Parsed PT model containing 323 places and 846 transitions and 5865 arcs in 694 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 34 ms.
Working with output stream class java.io.PrintStream
RANDOM walk for 40000 steps (335 resets) in 2122 ms. (18 steps per ms) remains 8/16 properties
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-12 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-10 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-08 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-06 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-05 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-04 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-03 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-00 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
BEST_FIRST walk for 40000 steps (43 resets) in 536 ms. (74 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40004 steps (54 resets) in 664 ms. (60 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40003 steps (58 resets) in 785 ms. (50 steps per ms) remains 7/8 properties
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-13 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
BEST_FIRST walk for 40002 steps (62 resets) in 351 ms. (113 steps per ms) remains 7/7 properties
BEST_FIRST walk for 40002 steps (46 resets) in 140 ms. (283 steps per ms) remains 6/7 properties
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-11 FALSE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
BEST_FIRST walk for 40004 steps (61 resets) in 122 ms. (325 steps per ms) remains 6/6 properties
BEST_FIRST walk for 40004 steps (61 resets) in 540 ms. (73 steps per ms) remains 6/6 properties
// Phase 1: matrix 846 rows 323 cols
[2024-05-22 04:41:30] [INFO ] Computed 12 invariants in 26 ms
All remaining problems are real, not stopping.
At refinement iteration 0 (INCLUDED_ONLY) 0/101 variables, 101/101 constraints. Problems are: Problem set: 0 solved, 6 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/101 variables, 0/101 constraints. Problems are: Problem set: 0 solved, 6 unsolved
At refinement iteration 2 (OVERLAPS) 222/323 variables, 12/113 constraints. Problems are: Problem set: 0 solved, 6 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/323 variables, 222/335 constraints. Problems are: Problem set: 0 solved, 6 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/323 variables, 0/335 constraints. Problems are: Problem set: 0 solved, 6 unsolved
At refinement iteration 5 (OVERLAPS) 846/1169 variables, 323/658 constraints. Problems are: Problem set: 0 solved, 6 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/1169 variables, 0/658 constraints. Problems are: Problem set: 0 solved, 6 unsolved
At refinement iteration 7 (OVERLAPS) 0/1169 variables, 0/658 constraints. Problems are: Problem set: 0 solved, 6 unsolved
No progress, stopping.
After SMT solving in domain Real declared 1169/1169 variables, and 658 constraints, problems are : Problem set: 0 solved, 6 unsolved in 1423 ms.
Refiners :[Domain max(s): 323/323 constraints, Positive P Invariants (semi-flows): 12/12 constraints, State Equation: 323/323 constraints, PredecessorRefiner: 6/6 constraints, Known Traps: 0/0 constraints]
Escalating to Integer solving :Problem set: 0 solved, 6 unsolved
At refinement iteration 0 (INCLUDED_ONLY) 0/101 variables, 101/101 constraints. Problems are: Problem set: 0 solved, 6 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/101 variables, 0/101 constraints. Problems are: Problem set: 0 solved, 6 unsolved
Problem AutonomousCar-PT-07b-ReachabilityFireability-2024-07 is UNSAT
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-07 TRUE TECHNIQUES SMT_REFINEMENT
Problem AutonomousCar-PT-07b-ReachabilityFireability-2024-09 is UNSAT
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-09 TRUE TECHNIQUES SMT_REFINEMENT
Problem AutonomousCar-PT-07b-ReachabilityFireability-2024-15 is UNSAT
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-15 TRUE TECHNIQUES SMT_REFINEMENT
At refinement iteration 2 (OVERLAPS) 222/323 variables, 12/113 constraints. Problems are: Problem set: 3 solved, 3 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/323 variables, 222/335 constraints. Problems are: Problem set: 3 solved, 3 unsolved
[2024-05-22 04:41:33] [INFO ] Deduced a trap composed of 35 places in 459 ms of which 38 ms to minimize.
[2024-05-22 04:41:34] [INFO ] Deduced a trap composed of 35 places in 365 ms of which 4 ms to minimize.
Problem AutonomousCar-PT-07b-ReachabilityFireability-2024-02 is UNSAT
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-02 FALSE TECHNIQUES SMT_REFINEMENT
Problem AutonomousCar-PT-07b-ReachabilityFireability-2024-14 is UNSAT
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-14 TRUE TECHNIQUES SMT_REFINEMENT
At refinement iteration 4 (INCLUDED_ONLY) 0/323 variables, 2/337 constraints. Problems are: Problem set: 5 solved, 1 unsolved
[2024-05-22 04:41:34] [INFO ] Deduced a trap composed of 7 places in 368 ms of which 3 ms to minimize.
[2024-05-22 04:41:34] [INFO ] Deduced a trap composed of 35 places in 319 ms of which 4 ms to minimize.
At refinement iteration 5 (INCLUDED_ONLY) 0/323 variables, 2/339 constraints. Problems are: Problem set: 5 solved, 1 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/323 variables, 0/339 constraints. Problems are: Problem set: 5 solved, 1 unsolved
At refinement iteration 7 (OVERLAPS) 846/1169 variables, 323/662 constraints. Problems are: Problem set: 5 solved, 1 unsolved
At refinement iteration 8 (INCLUDED_ONLY) 0/1169 variables, 1/663 constraints. Problems are: Problem set: 5 solved, 1 unsolved
[2024-05-22 04:41:35] [INFO ] Deduced a trap composed of 9 places in 246 ms of which 3 ms to minimize.
[2024-05-22 04:41:35] [INFO ] Deduced a trap composed of 18 places in 210 ms of which 3 ms to minimize.
At refinement iteration 9 (INCLUDED_ONLY) 0/1169 variables, 2/665 constraints. Problems are: Problem set: 5 solved, 1 unsolved
At refinement iteration 10 (INCLUDED_ONLY) 0/1169 variables, 0/665 constraints. Problems are: Problem set: 5 solved, 1 unsolved
At refinement iteration 11 (OVERLAPS) 0/1169 variables, 0/665 constraints. Problems are: Problem set: 5 solved, 1 unsolved
No progress, stopping.
After SMT solving in domain Int declared 1169/1169 variables, and 665 constraints, problems are : Problem set: 5 solved, 1 unsolved in 3187 ms.
Refiners :[Domain max(s): 323/323 constraints, Positive P Invariants (semi-flows): 12/12 constraints, State Equation: 323/323 constraints, PredecessorRefiner: 1/6 constraints, Known Traps: 6/6 constraints]
After SMT, in 5434ms problems are : Problem set: 5 solved, 1 unsolved
Parikh walk visited 0 properties in 100 ms.
Support contains 5 out of 323 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 323/323 places, 846/846 transitions.
Graph (trivial) has 303 edges and 323 vertex of which 4 / 323 are part of one of the 2 SCC in 5 ms
Free SCC test removed 2 places
Drop transitions (Empty/Sink Transition effects.) removed 4 transitions
Reduce isomorphic transitions removed 4 transitions.
Graph (complete) has 1181 edges and 321 vertex of which 316 are kept as prefixes of interest. Removing 5 places using SCC suffix rule.10 ms
Discarding 5 places :
Also discarding 3 output transitions
Drop transitions (Output transitions of discarded places.) removed 3 transitions
Drop transitions (Empty/Sink Transition effects.) removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Drop transitions (Trivial Post-Agglo cleanup.) removed 142 transitions
Trivial Post-agglo rules discarded 142 transitions
Performed 142 trivial Post agglomeration. Transition count delta: 142
Iterating post reduction 0 with 143 rules applied. Total rules applied 145 place count 316 transition count 696
Reduce places removed 142 places and 0 transitions.
Ensure Unique test removed 18 transitions
Reduce isomorphic transitions removed 18 transitions.
Drop transitions (Trivial Post-Agglo cleanup.) removed 24 transitions
Trivial Post-agglo rules discarded 24 transitions
Performed 24 trivial Post agglomeration. Transition count delta: 24
Iterating post reduction 1 with 184 rules applied. Total rules applied 329 place count 174 transition count 654
Reduce places removed 24 places and 0 transitions.
Iterating post reduction 2 with 24 rules applied. Total rules applied 353 place count 150 transition count 654
Performed 7 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 3 with 7 Pre rules applied. Total rules applied 353 place count 150 transition count 647
Deduced a syphon composed of 7 places in 2 ms
Reduce places removed 7 places and 0 transitions.
Iterating global reduction 3 with 14 rules applied. Total rules applied 367 place count 143 transition count 647
Discarding 28 places :
Symmetric choice reduction at 3 with 28 rule applications. Total rules 395 place count 115 transition count 619
Iterating global reduction 3 with 28 rules applied. Total rules applied 423 place count 115 transition count 619
Ensure Unique test removed 196 transitions
Reduce isomorphic transitions removed 196 transitions.
Iterating post reduction 3 with 196 rules applied. Total rules applied 619 place count 115 transition count 423
Performed 1 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 4 with 1 Pre rules applied. Total rules applied 619 place count 115 transition count 422
Deduced a syphon composed of 1 places in 2 ms
Reduce places removed 1 places and 0 transitions.
Iterating global reduction 4 with 2 rules applied. Total rules applied 621 place count 114 transition count 422
Discarding 8 places :
Symmetric choice reduction at 4 with 8 rule applications. Total rules 629 place count 106 transition count 372
Iterating global reduction 4 with 8 rules applied. Total rules applied 637 place count 106 transition count 372
Ensure Unique test removed 7 transitions
Reduce isomorphic transitions removed 7 transitions.
Drop transitions (Trivial Post-Agglo cleanup.) removed 7 transitions
Trivial Post-agglo rules discarded 7 transitions
Performed 7 trivial Post agglomeration. Transition count delta: 7
Iterating post reduction 4 with 14 rules applied. Total rules applied 651 place count 106 transition count 358
Reduce places removed 7 places and 0 transitions.
Iterating post reduction 5 with 7 rules applied. Total rules applied 658 place count 99 transition count 358
Performed 36 Post agglomeration using F-continuation condition with reduction of 1 identical transitions.
Deduced a syphon composed of 36 places in 0 ms
Reduce places removed 36 places and 0 transitions.
Iterating global reduction 6 with 72 rules applied. Total rules applied 730 place count 63 transition count 321
Discarding 6 places :
Symmetric choice reduction at 6 with 6 rule applications. Total rules 736 place count 57 transition count 273
Iterating global reduction 6 with 6 rules applied. Total rules applied 742 place count 57 transition count 273
Free-agglomeration rule applied 8 times.
Iterating global reduction 6 with 8 rules applied. Total rules applied 750 place count 57 transition count 265
Reduce places removed 8 places and 0 transitions.
Iterating post reduction 6 with 8 rules applied. Total rules applied 758 place count 49 transition count 265
Partial Free-agglomeration rule applied 1 times.
Drop transitions (Partial Free agglomeration) removed 1 transitions
Iterating global reduction 7 with 1 rules applied. Total rules applied 759 place count 49 transition count 265
Reduce places removed 1 places and 1 transitions.
Iterating global reduction 7 with 1 rules applied. Total rules applied 760 place count 48 transition count 264
Applied a total of 760 rules in 268 ms. Remains 48 /323 variables (removed 275) and now considering 264/846 (removed 582) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 284 ms. Remains : 48/323 places, 264/846 transitions.
RANDOM walk for 2297 steps (17 resets) in 29 ms. (76 steps per ms) remains 0/1 properties
FORMULA AutonomousCar-PT-07b-ReachabilityFireability-2024-01 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
All properties solved without resorting to model-checking.
Total runtime 8547 ms.
ITS solved all properties within timeout

BK_STOP 1716352896640

--------------------
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_1.0.0.202405141337.jar
+ VERSION=202405141337
+ echo 'Running Version 202405141337'
+ /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="AutonomousCar-PT-07b"
export BK_EXAMINATION="ReachabilityFireability"
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 AutonomousCar-PT-07b, 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 r025-smll-171620166400327"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/AutonomousCar-PT-07b.tgz
mv AutonomousCar-PT-07b 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 ;