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.r522-tall-167987247000145.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 CryptoMiner-PT-D03N000, examination is CTLCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r522-tall-167987247000145
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 544K
-rw-r--r-- 1 mcc users 12K Mar 23 15:19 CTLCardinality.txt
-rw-r--r-- 1 mcc users 99K Mar 23 15:19 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.5K Mar 23 15:18 CTLFireability.txt
-rw-r--r-- 1 mcc users 54K Mar 23 15:18 CTLFireability.xml
-rw-r--r-- 1 mcc users 5.4K Mar 23 07:06 LTLCardinality.txt
-rw-r--r-- 1 mcc users 30K Mar 23 07:06 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.7K Mar 23 07:06 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Mar 23 07:06 LTLFireability.xml
-rw-r--r-- 1 mcc users 1 Mar 26 22:42 NewModel
-rw-r--r-- 1 mcc users 20K Mar 23 15:20 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 156K Mar 23 15:20 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 11K Mar 23 15:20 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 82K Mar 23 15:20 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 2.1K Mar 23 07:06 UpperBounds.txt
-rw-r--r-- 1 mcc users 4.6K Mar 23 07:06 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 Mar 26 22:42 equiv_col
-rw-r--r-- 1 mcc users 8 Mar 26 22:42 instance
-rw-r--r-- 1 mcc users 6 Mar 26 22:42 iscolored
-rw-r--r-- 1 mcc users 3.5K Mar 31 16:48 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 CryptoMiner-PT-D03N000-CTLCardinality-00
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-01
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-02
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-03
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-04
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-05
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-06
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-07
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-08
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-09
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-10
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-11
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-12
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-13
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-14
FORMULA_NAME CryptoMiner-PT-D03N000-CTLCardinality-15

=== Now, execution of the tool begins

BK_START 1680873717061

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=CTLCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=CryptoMiner-PT-D03N000
Applying reductions before tool marcie
Invoking reducer
Running Version 202304061127
[2023-04-07 13:21:58] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, CTLCardinality, -timeout, 360, -rebuildPNML]
[2023-04-07 13:21:58] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-04-07 13:21:58] [INFO ] Load time of PNML (sax parser for PT used): 17 ms
[2023-04-07 13:21:58] [INFO ] Transformed 8 places.
[2023-04-07 13:21:58] [INFO ] Transformed 8 transitions.
[2023-04-07 13:21:58] [INFO ] Parsed PT model containing 8 places and 8 transitions and 22 arcs in 69 ms.
Parsed 16 properties from file /home/mcc/execution/CTLCardinality.xml in 15 ms.
Support contains 8 out of 8 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 8/8 places, 8/8 transitions.
Applied a total of 0 rules in 5 ms. Remains 8 /8 variables (removed 0) and now considering 8/8 (removed 0) transitions.
// Phase 1: matrix 8 rows 8 cols
[2023-04-07 13:21:58] [INFO ] Computed 0 invariants in 6 ms
[2023-04-07 13:21:58] [INFO ] Implicit Places using invariants in 104 ms returned []
[2023-04-07 13:21:58] [INFO ] Invariant cache hit.
[2023-04-07 13:21:58] [INFO ] State equation strengthened by 3 read => feed constraints.
[2023-04-07 13:21:58] [INFO ] Implicit Places using invariants and state equation in 47 ms returned []
Implicit Place search using SMT with State Equation took 175 ms to find 0 implicit places.
[2023-04-07 13:21:58] [INFO ] Invariant cache hit.
[2023-04-07 13:21:58] [INFO ] Dead Transitions using invariants and state equation in 25 ms found 0 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 207 ms. Remains : 8/8 places, 8/8 transitions.
Support contains 8 out of 8 places after structural reductions.
[2023-04-07 13:21:59] [INFO ] Initial state reduction rules for CTL removed 1 formulas.
[2023-04-07 13:21:59] [INFO ] Flatten gal took : 12 ms
[2023-04-07 13:21:59] [INFO ] Initial state reduction rules for CTL removed 1 formulas.
FORMULA CryptoMiner-PT-D03N000-CTLCardinality-08 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA CryptoMiner-PT-D03N000-CTLCardinality-07 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2023-04-07 13:21:59] [INFO ] Flatten gal took : 2 ms
[2023-04-07 13:21:59] [INFO ] Input system was already deterministic with 8 transitions.
Incomplete random walk after 10000 steps, including 1388 resets, run finished after 414 ms. (steps per millisecond=24 ) properties (out of 39) seen :21
Incomplete Best-First random walk after 1000 steps, including 56 resets, run finished after 16 ms. (steps per millisecond=62 ) properties (out of 18) seen :1
Incomplete Best-First random walk after 1001 steps, including 4 resets, run finished after 7 ms. (steps per millisecond=143 ) properties (out of 17) seen :7
Incomplete Best-First random walk after 1001 steps, including 82 resets, run finished after 11 ms. (steps per millisecond=91 ) properties (out of 10) seen :0
Incomplete Best-First random walk after 1000 steps, including 84 resets, run finished after 21 ms. (steps per millisecond=47 ) properties (out of 10) seen :0
Incomplete Best-First random walk after 1001 steps, including 77 resets, run finished after 23 ms. (steps per millisecond=43 ) properties (out of 10) seen :0
Incomplete Best-First random walk after 1001 steps, including 73 resets, run finished after 23 ms. (steps per millisecond=43 ) properties (out of 10) seen :0
Incomplete Best-First random walk after 1000 steps, including 56 resets, run finished after 17 ms. (steps per millisecond=58 ) properties (out of 10) seen :0
Incomplete Best-First random walk after 1001 steps, including 3 resets, run finished after 15 ms. (steps per millisecond=66 ) properties (out of 10) seen :1
Incomplete Best-First random walk after 1001 steps, including 78 resets, run finished after 17 ms. (steps per millisecond=58 ) properties (out of 9) seen :0
Incomplete Best-First random walk after 1001 steps, including 79 resets, run finished after 17 ms. (steps per millisecond=58 ) properties (out of 9) seen :0
Incomplete Best-First random walk after 1001 steps, including 82 resets, run finished after 25 ms. (steps per millisecond=40 ) properties (out of 9) seen :0
Running SMT prover for 9 properties.
[2023-04-07 13:22:00] [INFO ] Invariant cache hit.
[2023-04-07 13:22:00] [INFO ] After 70ms SMT Verify possible using all constraints in real domain returned unsat :9 sat :0
Fused 9 Parikh solutions to 0 different solutions.
Parikh walk visited 0 properties in 0 ms.
Successfully simplified 9 atomic propositions for a total of 14 simplifications.
FORMULA CryptoMiner-PT-D03N000-CTLCardinality-00 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA CryptoMiner-PT-D03N000-CTLCardinality-05 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA CryptoMiner-PT-D03N000-CTLCardinality-15 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2023-04-07 13:22:00] [INFO ] Initial state reduction rules for CTL removed 1 formulas.
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 2 ms
[2023-04-07 13:22:00] [INFO ] Initial state reduction rules for CTL removed 1 formulas.
FORMULA CryptoMiner-PT-D03N000-CTLCardinality-06 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA CryptoMiner-PT-D03N000-CTLCardinality-03 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Input system was already deterministic with 8 transitions.
Computed a total of 4 stabilizing places and 4 stable transitions
Graph (complete) has 17 edges and 8 vertex of which 7 are kept as prefixes of interest. Removing 1 places using SCC suffix rule.1 ms
Starting structural reductions in SI_CTL mode, iteration 0 : 8/8 places, 8/8 transitions.
Applied a total of 0 rules in 5 ms. Remains 8 /8 variables (removed 0) and now considering 8/8 (removed 0) transitions.
Finished structural reductions in SI_CTL mode , in 1 iterations and 5 ms. Remains : 8/8 places, 8/8 transitions.
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Input system was already deterministic with 8 transitions.
Incomplete random walk after 10000 steps, including 1402 resets, run finished after 11 ms. (steps per millisecond=909 ) properties (out of 1) seen :0
Finished Best-First random walk after 195 steps, including 0 resets, run visited all 1 properties in 1 ms. (steps per millisecond=195 )
FORMULA CryptoMiner-PT-D03N000-CTLCardinality-01 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
Parikh walk visited 0 properties in 0 ms.
Starting structural reductions in LTL mode, iteration 0 : 8/8 places, 8/8 transitions.
Applied a total of 0 rules in 0 ms. Remains 8 /8 variables (removed 0) and now considering 8/8 (removed 0) transitions.
Finished structural reductions in LTL mode , in 1 iterations and 1 ms. Remains : 8/8 places, 8/8 transitions.
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Input system was already deterministic with 8 transitions.
Starting structural reductions in LTL mode, iteration 0 : 8/8 places, 8/8 transitions.
Applied a total of 0 rules in 0 ms. Remains 8 /8 variables (removed 0) and now considering 8/8 (removed 0) transitions.
Finished structural reductions in LTL mode , in 1 iterations and 0 ms. Remains : 8/8 places, 8/8 transitions.
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Input system was already deterministic with 8 transitions.
Starting structural reductions in SI_CTL mode, iteration 0 : 8/8 places, 8/8 transitions.
Graph (complete) has 17 edges and 8 vertex of which 7 are kept as prefixes of interest. Removing 1 places using SCC suffix rule.1 ms
Discarding 1 places :
Also discarding 0 output transitions
Applied a total of 1 rules in 2 ms. Remains 7 /8 variables (removed 1) and now considering 8/8 (removed 0) transitions.
Finished structural reductions in SI_CTL mode , in 1 iterations and 3 ms. Remains : 7/8 places, 8/8 transitions.
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Input system was already deterministic with 8 transitions.
Starting structural reductions in SI_CTL mode, iteration 0 : 8/8 places, 8/8 transitions.
Graph (complete) has 17 edges and 8 vertex of which 7 are kept as prefixes of interest. Removing 1 places using SCC suffix rule.0 ms
Discarding 1 places :
Also discarding 0 output transitions
Applied a total of 1 rules in 1 ms. Remains 7 /8 variables (removed 1) and now considering 8/8 (removed 0) transitions.
Finished structural reductions in SI_CTL mode , in 1 iterations and 2 ms. Remains : 7/8 places, 8/8 transitions.
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 5 ms
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Input system was already deterministic with 8 transitions.
Starting structural reductions in LTL mode, iteration 0 : 8/8 places, 8/8 transitions.
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 0 with 1 rules applied. Total rules applied 1 place count 7 transition count 8
Applied a total of 1 rules in 1 ms. Remains 7 /8 variables (removed 1) and now considering 8/8 (removed 0) transitions.
Finished structural reductions in LTL mode , in 1 iterations and 1 ms. Remains : 7/8 places, 8/8 transitions.
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Input system was already deterministic with 8 transitions.
Starting structural reductions in LTL mode, iteration 0 : 8/8 places, 8/8 transitions.
Applied a total of 0 rules in 0 ms. Remains 8 /8 variables (removed 0) and now considering 8/8 (removed 0) transitions.
Finished structural reductions in LTL mode , in 1 iterations and 0 ms. Remains : 8/8 places, 8/8 transitions.
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Input system was already deterministic with 8 transitions.
Starting structural reductions in SI_CTL mode, iteration 0 : 8/8 places, 8/8 transitions.
Graph (complete) has 17 edges and 8 vertex of which 7 are kept as prefixes of interest. Removing 1 places using SCC suffix rule.1 ms
Discarding 1 places :
Also discarding 0 output transitions
Applied a total of 1 rules in 2 ms. Remains 7 /8 variables (removed 1) and now considering 8/8 (removed 0) transitions.
Finished structural reductions in SI_CTL mode , in 1 iterations and 2 ms. Remains : 7/8 places, 8/8 transitions.
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Input system was already deterministic with 8 transitions.
Starting structural reductions in LTL mode, iteration 0 : 8/8 places, 8/8 transitions.
Applied a total of 0 rules in 0 ms. Remains 8 /8 variables (removed 0) and now considering 8/8 (removed 0) transitions.
Finished structural reductions in LTL mode , in 1 iterations and 0 ms. Remains : 8/8 places, 8/8 transitions.
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 0 ms
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 0 ms
[2023-04-07 13:22:00] [INFO ] Input system was already deterministic with 8 transitions.
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 1 ms
[2023-04-07 13:22:00] [INFO ] Flatten gal took : 0 ms
[2023-04-07 13:22:00] [INFO ] Export to MCC of 8 properties in file /home/mcc/execution/CTLCardinality.sr.xml took 1 ms.
[2023-04-07 13:22:00] [INFO ] Export to PNML in file /home/mcc/execution/model.sr.pnml of net with 8 places, 8 transitions and 22 arcs took 0 ms.
Total runtime 1843 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=CTLCardinality.xml --memory=6 --mcc-mode

parse successfull
net created successfully

Net: Petri
(NrP: 8 NrTr: 8 NrArc: 22)

parse formulas
formulas created successfully
place and transition orderings generation:0m 0.000sec

net check time: 0m 0.000sec

init dd package: 0m 2.739sec

TIME LIMIT: Killed by timeout after 3600 seconds
MemTotal: 16393216 kB
MemFree: 10575324 kB
After kill :
MemTotal: 16393216 kB
MemFree: 16108364 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//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202304061127.jar
+ VERSION=202304061127
+ echo 'Running Version 202304061127'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination CTLCardinality -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 0.000sec

8 8 8

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="CryptoMiner-PT-D03N000"
export BK_EXAMINATION="CTLCardinality"
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 CryptoMiner-PT-D03N000, examination is CTLCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r522-tall-167987247000145"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/CryptoMiner-PT-D03N000.tgz
mv CryptoMiner-PT-D03N000 execution
cd execution
if [ "CTLCardinality" = "ReachabilityDeadlock" ] || [ "CTLCardinality" = "UpperBounds" ] || [ "CTLCardinality" = "QuasiLiveness" ] || [ "CTLCardinality" = "StableMarking" ] || [ "CTLCardinality" = "Liveness" ] || [ "CTLCardinality" = "OneSafe" ] || [ "CTLCardinality" = "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 [ "CTLCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "CTLCardinality" != "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 "CTLCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property CTLCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "CTLCardinality.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 '' CTLCardinality.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "CTLCardinality" = "ReachabilityDeadlock" ] || [ "CTLCardinality" = "QuasiLiveness" ] || [ "CTLCardinality" = "StableMarking" ] || [ "CTLCardinality" = "Liveness" ] || [ "CTLCardinality" = "OneSafe" ] ; then
echo "FORMULA_NAME CTLCardinality"
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 ;