fond

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Model Checking Contest 2023
13th edition, Paris, France, April 26, 2023 (at TOOLympics II)
Execution of r329-tall-167889202600855
Last Updated
May 14, 2023

About the Execution of LTSMin+red for RingSingleMessageInMbox-PT-d1m020

Execution Summary
Max Memory
Used (MB)		 Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
14342.023 3578831.00 4813575.00 7703.40 FFFTFTTFTTFTTFTF normal

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.r329-tall-167889202600855.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 ltsminxred
Input is RingSingleMessageInMbox-PT-d1m020, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r329-tall-167889202600855
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 6.3M
-rw-r--r-- 1 mcc users 8.8K Feb 26 05:06 CTLCardinality.txt
-rw-r--r-- 1 mcc users 93K Feb 26 05:06 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.4K Feb 26 05:04 CTLFireability.txt
-rw-r--r-- 1 mcc users 45K Feb 26 05:04 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.9K Feb 25 16:46 LTLCardinality.txt
-rw-r--r-- 1 mcc users 25K Feb 25 16:46 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.5K Feb 25 16:46 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Feb 25 16:46 LTLFireability.xml
-rw-r--r-- 1 mcc users 14K Feb 26 05:11 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 141K Feb 26 05:11 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.3K Feb 26 05:09 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 66K Feb 26 05:09 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.9K Feb 25 16:46 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.9K Feb 25 16:46 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 equiv_col
-rw-r--r-- 1 mcc users 7 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 5.8M 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 RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-00
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-01
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-02
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-03
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-04
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-05
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-06
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-07
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-08
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-09
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-10
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-11
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-12
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-13
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-14
FORMULA_NAME RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-15

=== Now, execution of the tool begins

BK_START 1679176768592

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=ltsminxred
BK_EXAMINATION=ReachabilityFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=RingSingleMessageInMbox-PT-d1m020
Applying reductions before tool ltsmin
Invoking reducer
Running Version 202303021504
[2023-03-18 21:59:30] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -timeout, 360, -rebuildPNML]
[2023-03-18 21:59:30] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-18 21:59:30] [INFO ] Load time of PNML (sax parser for PT used): 449 ms
[2023-03-18 21:59:30] [INFO ] Transformed 6690 places.
[2023-03-18 21:59:30] [INFO ] Transformed 11934 transitions.
[2023-03-18 21:59:30] [INFO ] Parsed PT model containing 6690 places and 11934 transitions and 47736 arcs in 566 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 13 ms.
Working with output stream class java.io.PrintStream
Deduced a syphon composed of 4305 places in 65 ms
Reduce places removed 4305 places and 0 transitions.
Incomplete random walk after 10000 steps, including 1552 resets, run finished after 1166 ms. (steps per millisecond=8 ) properties (out of 16) seen :11
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-15 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-13 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-12 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-10 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-09 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-08 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-07 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-06 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-05 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-04 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-00 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Incomplete Best-First random walk after 10001 steps, including 36 resets, run finished after 40 ms. (steps per millisecond=250 ) properties (out of 5) seen :0
Incomplete Best-First random walk after 10001 steps, including 18 resets, run finished after 26 ms. (steps per millisecond=384 ) properties (out of 5) seen :0
Incomplete Best-First random walk after 10001 steps, including 41 resets, run finished after 95 ms. (steps per millisecond=105 ) properties (out of 5) seen :0
Incomplete Best-First random walk after 10001 steps, including 48 resets, run finished after 35 ms. (steps per millisecond=285 ) properties (out of 5) seen :0
Incomplete Best-First random walk after 10001 steps, including 49 resets, run finished after 46 ms. (steps per millisecond=217 ) properties (out of 5) seen :0
Running SMT prover for 5 properties.
// Phase 1: matrix 11934 rows 2385 cols
[2023-03-18 21:59:33] [INFO ] Computed 5 place invariants in 879 ms
[2023-03-18 21:59:34] [INFO ] [Real]Absence check using 2 positive place invariants in 36 ms returned sat
[2023-03-18 21:59:34] [INFO ] [Real]Absence check using 2 positive and 3 generalized place invariants in 48 ms returned sat
[2023-03-18 21:59:34] [INFO ] After 789ms SMT Verify possible using all constraints in real domain returned unsat :2 sat :0 real:3
[2023-03-18 21:59:34] [INFO ] [Nat]Absence check using 2 positive place invariants in 40 ms returned sat
[2023-03-18 21:59:35] [INFO ] [Nat]Absence check using 2 positive and 3 generalized place invariants in 47 ms returned sat
[2023-03-18 21:59:35] [INFO ] After 520ms SMT Verify possible using all constraints in natural domain returned unsat :5 sat :0
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-14 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-11 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-03 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-02 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-01 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
Fused 5 Parikh solutions to 0 different solutions.
Parikh walk visited 0 properties in 0 ms.
All properties solved without resorting to model-checking.
Total runtime 4758 ms.
pnml2lts-sym model.pnml --lace-workers=4 --vset=lddmc --saturation=sat -rbs,w2W,ru,hf --sylvan-sizes=20,28,20,28 --inv-bin-par --invariant=/tmp/455/inv_0_ --invariant=/tmp/455/inv_1_ --invariant=/tmp/455/inv_2_ --invariant=/tmp/455/inv_3_ --invariant=/tmp/455/inv_4_ --invariant=/tmp/455/inv_5_ --invariant=/tmp/455/inv_6_ --invariant=/tmp/455/inv_7_ --invariant=/tmp/455/inv_8_ --invariant=/tmp/455/inv_9_ --invariant=/tmp/455/inv_10_ --invariant=/tmp/455/inv_11_ --invariant=/tmp/455/inv_12_ --invariant=/tmp/455/inv_13_ --invariant=/tmp/455/inv_14_ --invariant=/tmp/455/inv_15_ --inv-par
TIME LIMIT: Killed by timeout after 3570 seconds
MemTotal: 16393232 kB
MemFree: 1802904 kB
After kill :
MemTotal: 16393232 kB
MemFree: 16095780 kB
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-00
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-01
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-02
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-03
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-04
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-05
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-06
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-07
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-08
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-09
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-10
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-11
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-12
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-13
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-14
Could not compute solution for formula : RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-15

BK_STOP 1679180347423

--------------------
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_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityFireability -timeout 360 -rebuildPNML
mcc2023
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-00
rfs formula type AG
rfs formula formula --invariant=/tmp/455/inv_0_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-01
rfs formula type EF
rfs formula formula --invariant=/tmp/455/inv_1_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-02
rfs formula type EF
rfs formula formula --invariant=/tmp/455/inv_2_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-03
rfs formula type AG
rfs formula formula --invariant=/tmp/455/inv_3_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-04
rfs formula type AG
rfs formula formula --invariant=/tmp/455/inv_4_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-05
rfs formula type EF
rfs formula formula --invariant=/tmp/455/inv_5_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-06
rfs formula type EF
rfs formula formula --invariant=/tmp/455/inv_6_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-07
rfs formula type AG
rfs formula formula --invariant=/tmp/455/inv_7_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-08
rfs formula type EF
rfs formula formula --invariant=/tmp/455/inv_8_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-09
rfs formula type EF
rfs formula formula --invariant=/tmp/455/inv_9_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-10
rfs formula type AG
rfs formula formula --invariant=/tmp/455/inv_10_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-11
rfs formula type AG
rfs formula formula --invariant=/tmp/455/inv_11_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-12
rfs formula type EF
rfs formula formula --invariant=/tmp/455/inv_12_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-13
rfs formula type AG
rfs formula formula --invariant=/tmp/455/inv_13_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-14
rfs formula type AG
rfs formula formula --invariant=/tmp/455/inv_14_
rfs formula name RingSingleMessageInMbox-PT-d1m020-ReachabilityFireability-15
rfs formula type AG
rfs formula formula --invariant=/tmp/455/inv_15_
pnml2lts-sym: Exploration order is bfs-prev
pnml2lts-sym: Saturation strategy is sat
pnml2lts-sym: Guided search strategy is unguided
pnml2lts-sym: Attractor strategy is default
pnml2lts-sym: opening model.pnml
pnml2lts-sym: Edge label is id
Warning: program compiled against libxml 210 using older 209
pnml2lts-sym: Petri net has 6690 places, 11934 transitions and 47736 arcs
pnml2lts-sym: Petri net RingSingleMessageInMbox-PT-d1m020 analyzed
pnml2lts-sym: There are no safe places
pnml2lts-sym: Loading Petri net took 0.200 real 0.140 user 0.060 sys
pnml2lts-sym: Initializing regrouping layer
pnml2lts-sym: Regroup specification: bs,w2W,ru,hf
pnml2lts-sym: Regroup Boost's Sloan
pnml2lts-sym: Regroup over-approximate must-write to may-write
pnml2lts-sym: Regroup Row sUbsume
pnml2lts-sym: Reqroup Horizontal Flip
pnml2lts-sym: Regrouping: 11934->11934 groups
pnml2lts-sym: Regrouping took 3166.770 real 3166.030 user 0.230 sys
pnml2lts-sym: state vector length is 6690; there are 11934 groups
pnml2lts-sym: Creating a multi-core ListDD domain.
pnml2lts-sym: Sylvan allocates 15.000 GB virtual memory for nodes table and operation cache.
pnml2lts-sym: Initial nodes table and operation cache requires 60.00 MB.
pnml2lts-sym: Using GBgetTransitionsShortR2W as next-state function
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: vset_sylvan: starting garbage collection
pnml2lts-sym: vset_sylvan: garbage collection done
pnml2lts-sym: got initial state
Killing (15) : 461
Killing (9) : 461

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="RingSingleMessageInMbox-PT-d1m020"
export BK_EXAMINATION="ReachabilityFireability"
export BK_TOOL="ltsminxred"
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 ltsminxred"
echo " Input is RingSingleMessageInMbox-PT-d1m020, 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 r329-tall-167889202600855"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/RingSingleMessageInMbox-PT-d1m020.tgz
mv RingSingleMessageInMbox-PT-d1m020 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 ;