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.r490-tall-167912708700494.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 marciexred
Input is Szymanski-PT-b12, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r490-tall-167912708700494
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 4.1M
-rw-r--r-- 1 mcc users 6.7K Feb 26 17:01 CTLCardinality.txt
-rw-r--r-- 1 mcc users 71K Feb 26 17:01 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.4K Feb 26 17:00 CTLFireability.txt
-rw-r--r-- 1 mcc users 50K Feb 26 17:00 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.6K Feb 25 17:19 LTLCardinality.txt
-rw-r--r-- 1 mcc users 24K Feb 25 17:19 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.4K Feb 25 17:19 LTLFireability.txt
-rw-r--r-- 1 mcc users 19K Feb 25 17:19 LTLFireability.xml
-rw-r--r-- 1 mcc users 16K Feb 26 17:04 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 173K Feb 26 17:04 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.5K Feb 26 17:02 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 72K Feb 26 17:02 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Feb 25 17:19 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Feb 25 17:19 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 equiv_col
-rw-r--r-- 1 mcc users 4 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 3.7M 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 Szymanski-PT-b12-ReachabilityCardinality-00
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-01
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-02
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-03
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-04
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-05
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-06
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-07
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-08
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-09
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-10
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-11
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-12
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-13
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-14
FORMULA_NAME Szymanski-PT-b12-ReachabilityCardinality-15

=== Now, execution of the tool begins

BK_START 1679270610852

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=marciexred
BK_EXAMINATION=ReachabilityCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=Szymanski-PT-b12
Applying reductions before tool marcie
Invoking reducer
Running Version 202303021504
[2023-03-20 00:03:32] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -timeout, 360, -rebuildPNML]
[2023-03-20 00:03:32] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-20 00:03:32] [INFO ] Load time of PNML (sax parser for PT used): 285 ms
[2023-03-20 00:03:32] [INFO ] Transformed 568 places.
[2023-03-20 00:03:32] [INFO ] Transformed 8320 transitions.
[2023-03-20 00:03:32] [INFO ] Parsed PT model containing 568 places and 8320 transitions and 33408 arcs in 381 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 17 ms.
Working with output stream class java.io.PrintStream
Deduced a syphon composed of 260 places in 27 ms
Reduce places removed 260 places and 256 transitions.
FORMULA Szymanski-PT-b12-ReachabilityCardinality-00 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b12-ReachabilityCardinality-01 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b12-ReachabilityCardinality-02 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b12-ReachabilityCardinality-03 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b12-ReachabilityCardinality-05 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b12-ReachabilityCardinality-06 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b12-ReachabilityCardinality-07 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b12-ReachabilityCardinality-12 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b12-ReachabilityCardinality-13 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b12-ReachabilityCardinality-15 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Incomplete random walk after 10009 steps, including 3 resets, run finished after 185 ms. (steps per millisecond=54 ) properties (out of 6) seen :3
FORMULA Szymanski-PT-b12-ReachabilityCardinality-11 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Szymanski-PT-b12-ReachabilityCardinality-08 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Szymanski-PT-b12-ReachabilityCardinality-04 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Incomplete Best-First random walk after 10001 steps, including 3 resets, run finished after 44 ms. (steps per millisecond=227 ) properties (out of 3) seen :1
FORMULA Szymanski-PT-b12-ReachabilityCardinality-09 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
Incomplete Best-First random walk after 10001 steps, including 3 resets, run finished after 36 ms. (steps per millisecond=277 ) properties (out of 2) seen :0
Incomplete Best-First random walk after 10001 steps, including 3 resets, run finished after 29 ms. (steps per millisecond=344 ) properties (out of 2) seen :0
Running SMT prover for 2 properties.
[2023-03-20 00:03:33] [INFO ] Flow matrix only has 2733 transitions (discarded 5331 similar events)
// Phase 1: matrix 2733 rows 308 cols
[2023-03-20 00:03:33] [INFO ] Computed 3 place invariants in 55 ms
[2023-03-20 00:03:33] [INFO ] After 207ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:2
[2023-03-20 00:03:33] [INFO ] [Nat]Absence check using 2 positive place invariants in 4 ms returned sat
[2023-03-20 00:03:33] [INFO ] [Nat]Absence check using 2 positive and 1 generalized place invariants in 0 ms returned sat
[2023-03-20 00:03:35] [INFO ] After 1948ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :2
[2023-03-20 00:03:35] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-20 00:03:40] [INFO ] After 4971ms SMT Verify possible using 147 Read/Feed constraints in natural domain returned unsat :0 sat :2
[2023-03-20 00:03:41] [INFO ] Deduced a trap composed of 178 places in 464 ms of which 11 ms to minimize.
[2023-03-20 00:03:41] [INFO ] Deduced a trap composed of 157 places in 276 ms of which 1 ms to minimize.
[2023-03-20 00:03:42] [INFO ] Deduced a trap composed of 217 places in 336 ms of which 1 ms to minimize.
[2023-03-20 00:03:42] [INFO ] Trap strengthening (SAT) tested/added 4/3 trap constraints in 1451 ms
[2023-03-20 00:03:42] [INFO ] Deduced a trap composed of 74 places in 343 ms of which 2 ms to minimize.
[2023-03-20 00:03:43] [INFO ] Deduced a trap composed of 80 places in 306 ms of which 0 ms to minimize.
[2023-03-20 00:03:43] [INFO ] Deduced a trap composed of 140 places in 261 ms of which 0 ms to minimize.
[2023-03-20 00:03:43] [INFO ] Deduced a trap composed of 138 places in 183 ms of which 0 ms to minimize.
[2023-03-20 00:03:43] [INFO ] Trap strengthening (SAT) tested/added 5/4 trap constraints in 1436 ms
[2023-03-20 00:03:44] [INFO ] After 8400ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :2
Attempting to minimize the solution found.
Minimization took 1557 ms.
[2023-03-20 00:03:45] [INFO ] After 12049ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :2
Parikh walk visited 0 properties in 58 ms.
Support contains 10 out of 308 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 308/308 places, 8064/8064 transitions.
Graph (complete) has 9195 edges and 308 vertex of which 306 are kept as prefixes of interest. Removing 2 places using SCC suffix rule.15 ms
Discarding 2 places :
Also discarding 0 output transitions
Drop transitions removed 124 transitions
Reduce isomorphic transitions removed 124 transitions.
Iterating post reduction 0 with 124 rules applied. Total rules applied 125 place count 306 transition count 7940
Discarding 1 places :
Symmetric choice reduction at 1 with 1 rule applications. Total rules 126 place count 305 transition count 7812
Iterating global reduction 1 with 1 rules applied. Total rules applied 127 place count 305 transition count 7812
Applied a total of 127 rules in 473 ms. Remains 305 /308 variables (removed 3) and now considering 7812/8064 (removed 252) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 475 ms. Remains : 305/308 places, 7812/8064 transitions.
Incomplete random walk after 10011 steps, including 3 resets, run finished after 48 ms. (steps per millisecond=208 ) properties (out of 2) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 28 ms. (steps per millisecond=357 ) properties (out of 2) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 22 ms. (steps per millisecond=454 ) properties (out of 2) seen :0
Interrupted probabilistic random walk after 150780 steps, run timeout after 3001 ms. (steps per millisecond=50 ) properties seen :{}
Probabilistic random walk after 150780 steps, saw 117731 distinct states, run finished after 3002 ms. (steps per millisecond=50 ) properties seen :0
Running SMT prover for 2 properties.
[2023-03-20 00:03:49] [INFO ] Flow matrix only has 2608 transitions (discarded 5204 similar events)
// Phase 1: matrix 2608 rows 305 cols
[2023-03-20 00:03:49] [INFO ] Computed 1 place invariants in 27 ms
[2023-03-20 00:03:49] [INFO ] After 60ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:2
[2023-03-20 00:03:49] [INFO ] [Nat]Absence check using 0 positive and 1 generalized place invariants in 2 ms returned sat
[2023-03-20 00:03:52] [INFO ] After 2731ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :2
[2023-03-20 00:03:52] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-20 00:03:57] [INFO ] After 5645ms SMT Verify possible using 147 Read/Feed constraints in natural domain returned unsat :0 sat :2
[2023-03-20 00:03:58] [INFO ] After 6258ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :2
Attempting to minimize the solution found.
Minimization took 140 ms.
[2023-03-20 00:03:58] [INFO ] After 9215ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :2
Parikh walk visited 0 properties in 14 ms.
Support contains 10 out of 305 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 305/305 places, 7812/7812 transitions.
Applied a total of 0 rules in 224 ms. Remains 305 /305 variables (removed 0) and now considering 7812/7812 (removed 0) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 224 ms. Remains : 305/305 places, 7812/7812 transitions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 305/305 places, 7812/7812 transitions.
Applied a total of 0 rules in 323 ms. Remains 305 /305 variables (removed 0) and now considering 7812/7812 (removed 0) transitions.
[2023-03-20 00:03:59] [INFO ] Flow matrix only has 2608 transitions (discarded 5204 similar events)
[2023-03-20 00:03:59] [INFO ] Invariant cache hit.
[2023-03-20 00:03:59] [INFO ] Implicit Places using invariants in 438 ms returned []
[2023-03-20 00:03:59] [INFO ] Flow matrix only has 2608 transitions (discarded 5204 similar events)
[2023-03-20 00:03:59] [INFO ] Invariant cache hit.
[2023-03-20 00:03:59] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-20 00:04:04] [INFO ] Implicit Places using invariants and state equation in 4471 ms returned []
Implicit Place search using SMT with State Equation took 4911 ms to find 0 implicit places.
[2023-03-20 00:04:04] [INFO ] Redundant transitions in 909 ms returned []
[2023-03-20 00:04:04] [INFO ] Flow matrix only has 2608 transitions (discarded 5204 similar events)
[2023-03-20 00:04:04] [INFO ] Invariant cache hit.
[2023-03-20 00:04:06] [INFO ] Dead Transitions using invariants and state equation in 1878 ms found 0 transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 8034 ms. Remains : 305/305 places, 7812/7812 transitions.
Graph (trivial) has 5232 edges and 305 vertex of which 38 / 305 are part of one of the 2 SCC in 5 ms
Free SCC test removed 36 places
Drop transitions removed 4264 transitions
Ensure Unique test removed 1182 transitions
Reduce isomorphic transitions removed 5446 transitions.
Drop transitions removed 416 transitions
Redundant transition composition rules discarded 416 transitions
Iterating global reduction 0 with 416 rules applied. Total rules applied 417 place count 269 transition count 1950
Applied a total of 417 rules in 371 ms. Remains 269 /305 variables (removed 36) and now considering 1950/7812 (removed 5862) transitions.
Running SMT prover for 2 properties.
// Phase 1: matrix 1950 rows 269 cols
[2023-03-20 00:04:07] [INFO ] Computed 1 place invariants in 11 ms
[2023-03-20 00:04:07] [INFO ] After 142ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:2
[2023-03-20 00:04:07] [INFO ] [Nat]Absence check using 0 positive and 1 generalized place invariants in 2 ms returned sat
[2023-03-20 00:04:07] [INFO ] After 546ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :2
[2023-03-20 00:04:07] [INFO ] State equation strengthened by 504 read => feed constraints.
[2023-03-20 00:04:09] [INFO ] After 1239ms SMT Verify possible using 504 Read/Feed constraints in natural domain returned unsat :0 sat :2
[2023-03-20 00:04:09] [INFO ] After 1643ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :2
Attempting to minimize the solution found.
Minimization took 353 ms.
[2023-03-20 00:04:09] [INFO ] After 2604ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :2
[2023-03-20 00:04:09] [INFO ] Export to MCC of 2 properties in file /home/mcc/execution/ReachabilityCardinality.sr.xml took 3 ms.
[2023-03-20 00:04:10] [INFO ] Export to PNML in file /home/mcc/execution/model.sr.pnml of net with 305 places, 7812 transitions and 31368 arcs took 38 ms.
[2023-03-20 00:04:10] [INFO ] Flatten gal took : 469 ms
Total runtime 38411 ms.
There are residual formulas that ITS could not solve within timeout
timeout --kill-after=10s --signal=SIGINT 1m for testing only

Marcie built on Linux at 2019-11-18.
A model checker for Generalized Stochastic Petri nets

authors: Alex Tovchigrechko (IDD package and CTL model checking)

Martin Schwarick (Symbolic numerical analysis and CSL model checking)

Christian Rohr (Simulative and approximative numerical model checking)

marcie@informatik.tu-cottbus.de

called as: /home/mcc/BenchKit/bin//../reducer/bin//../../marcie/bin/marcie --net-file=model.pnml --mcc-file=ReachabilityCardinality.xml --memory=6 --mcc-mode

parse successfull
net created successfully

Net: Szymanski_PT_b12
(NrP: 305 NrTr: 7812 NrArc: 31368)

parse formulas
formulas created successfully
place and transition orderings generation:0m 0.245sec

net check time: 0m 0.005sec

init dd package: 0m 2.692sec

TIME LIMIT: Killed by timeout after 3600 seconds
MemTotal: 16393232 kB
MemFree: 9874680 kB
After kill :
MemTotal: 16393232 kB
MemFree: 16089932 kB

BK_TIME_CONFINEMENT_REACHED

--------------------
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_1.0.0.202303021504.jar
++ perl -pe 's/.*\.//g'
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityCardinality -timeout 360 -rebuildPNML
check for maximal unmarked siphon
ok
check for constant places
ok
check if there are places and transitions
ok
check if there are transitions without pre-places
ok
check if at least one transition is enabled in m0
ok
check if there are transitions that can never fire
ok


initing FirstDep: 0m 0.108sec

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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="Szymanski-PT-b12"
export BK_EXAMINATION="ReachabilityCardinality"
export BK_TOOL="marciexred"
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 marciexred"
echo " Input is Szymanski-PT-b12, 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 r490-tall-167912708700494"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/Szymanski-PT-b12.tgz
mv Szymanski-PT-b12 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 ;