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-167912708400266.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 Sudoku-PT-AN14, examination is CTLFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r490-tall-167912708400266
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 66M
-rw-r--r-- 1 mcc users 1.2M Feb 26 09:48 CTLCardinality.txt
-rw-r--r-- 1 mcc users 5.5M Feb 26 09:48 CTLCardinality.xml
-rw-r--r-- 1 mcc users 1.6M Feb 26 08:55 CTLFireability.txt
-rw-r--r-- 1 mcc users 7.0M Feb 26 08:55 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:41 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.6K Jan 29 11:41 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 361K Feb 25 17:17 LTLCardinality.txt
-rw-r--r-- 1 mcc users 1.2M Feb 25 17:17 LTLCardinality.xml
-rw-r--r-- 1 mcc users 1.4M Feb 25 17:17 LTLFireability.txt
-rw-r--r-- 1 mcc users 4.6M Feb 25 17:17 LTLFireability.xml
-rw-r--r-- 1 mcc users 1.9M Feb 26 10:31 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 8.4M Feb 26 10:31 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 5.4M Feb 26 09:53 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 26M Feb 26 09:53 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 134K Feb 25 17:17 UpperBounds.txt
-rw-r--r-- 1 mcc users 325K Feb 25 17:17 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 equiv_col
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 1.5M 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 Sudoku-PT-AN14-CTLFireability-00
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-01
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-02
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-03
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-04
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-05
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-06
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-07
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-08
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-09
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-10
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-11
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-12
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-13
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-14
FORMULA_NAME Sudoku-PT-AN14-CTLFireability-15

=== Now, execution of the tool begins

BK_START 1679225907193

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=CTLFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=Sudoku-PT-AN14
Applying reductions before tool marcie
Invoking reducer
Running Version 202303021504
[2023-03-19 11:38:28] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, CTLFireability, -timeout, 360, -rebuildPNML]
[2023-03-19 11:38:28] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-19 11:38:28] [INFO ] Load time of PNML (sax parser for PT used): 258 ms
[2023-03-19 11:38:28] [INFO ] Transformed 3332 places.
[2023-03-19 11:38:28] [INFO ] Transformed 2744 transitions.
[2023-03-19 11:38:28] [INFO ] Parsed PT model containing 3332 places and 2744 transitions and 10976 arcs in 345 ms.
Parsed 16 properties from file /home/mcc/execution/CTLFireability.xml in 157 ms.
Support contains 588 out of 3332 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 3332/3332 places, 2744/2744 transitions.
Reduce places removed 2744 places and 0 transitions.
Iterating post reduction 0 with 2744 rules applied. Total rules applied 2744 place count 588 transition count 2744
Applied a total of 2744 rules in 57 ms. Remains 588 /3332 variables (removed 2744) and now considering 2744/2744 (removed 0) transitions.
// Phase 1: matrix 2744 rows 588 cols
[2023-03-19 11:38:32] [INFO ] Computed 41 place invariants in 193 ms
[2023-03-19 11:38:32] [INFO ] Implicit Places using invariants in 430 ms returned []
[2023-03-19 11:38:32] [INFO ] Invariant cache hit.
[2023-03-19 11:38:33] [INFO ] Implicit Places using invariants and state equation in 1009 ms returned []
Implicit Place search using SMT with State Equation took 1463 ms to find 0 implicit places.
[2023-03-19 11:38:33] [INFO ] Invariant cache hit.
[2023-03-19 11:38:34] [INFO ] Dead Transitions using invariants and state equation in 832 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 588/3332 places, 2744/2744 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 2356 ms. Remains : 588/3332 places, 2744/2744 transitions.
Support contains 588 out of 588 places after structural reductions.
[2023-03-19 11:38:36] [INFO ] Flatten gal took : 709 ms
[2023-03-19 11:38:43] [INFO ] Flatten gal took : 830 ms
[2023-03-19 11:38:50] [INFO ] Input system was already deterministic with 2744 transitions.
Incomplete random walk after 10000 steps, including 57 resets, run finished after 1989 ms. (steps per millisecond=5 ) properties (out of 49) seen :47
Interrupted Best-First random walk after 4746 steps, including 0 resets, run timeout after 5523 ms. (steps per millisecond=0 ) properties seen 0
Interrupted Best-First random walk after 4746 steps, including 0 resets, run timeout after 5534 ms. (steps per millisecond=0 ) properties seen 0
Running SMT prover for 2 properties.
[2023-03-19 11:39:04] [INFO ] Invariant cache hit.
[2023-03-19 11:39:21] [INFO ] After 2080ms SMT Verify possible using all constraints in real domain returned unsat :2 sat :0
Fused 2 Parikh solutions to 0 different solutions.
Parikh walk visited 0 properties in 1 ms.
Successfully simplified 2 atomic propositions for a total of 16 simplifications.
[2023-03-19 11:39:24] [INFO ] Flatten gal took : 479 ms
[2023-03-19 11:39:30] [INFO ] Flatten gal took : 688 ms
[2023-03-19 11:39:36] [INFO ] Input system was already deterministic with 2744 transitions.
Computed a total of 588 stabilizing places and 2744 stable transitions
Complete graph has no SCC; deadlocks are unavoidable. place count 588 transition count 2744
Detected that all paths lead to deadlock. Applying this knowledge to assert that all AP eventually converge (and all enablings converge to false).
AF dead knowledge conclusive for 2 formulas.
FORMULA Sudoku-PT-AN14-CTLFireability-02 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Sudoku-PT-AN14-CTLFireability-06 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Starting structural reductions in SI_CTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 22 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in SI_CTL mode , in 1 iterations and 23 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:37] [INFO ] Flatten gal took : 102 ms
[2023-03-19 11:39:38] [INFO ] Flatten gal took : 117 ms
[2023-03-19 11:39:38] [INFO ] Input system was already deterministic with 2744 transitions.
Starting structural reductions in SI_CTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 19 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in SI_CTL mode , in 1 iterations and 19 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:38] [INFO ] Flatten gal took : 96 ms
[2023-03-19 11:39:38] [INFO ] Flatten gal took : 123 ms
[2023-03-19 11:39:38] [INFO ] Input system was already deterministic with 2744 transitions.
Starting structural reductions in SI_CTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 15 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in SI_CTL mode , in 1 iterations and 16 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:39] [INFO ] Flatten gal took : 93 ms
[2023-03-19 11:39:39] [INFO ] Flatten gal took : 113 ms
[2023-03-19 11:39:39] [INFO ] Input system was already deterministic with 2744 transitions.
Starting structural reductions in LTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 5 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in LTL mode , in 1 iterations and 6 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:39] [INFO ] Flatten gal took : 160 ms
[2023-03-19 11:39:40] [INFO ] Flatten gal took : 215 ms
[2023-03-19 11:39:40] [INFO ] Input system was already deterministic with 2744 transitions.
Starting structural reductions in LTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 10 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in LTL mode , in 1 iterations and 11 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:41] [INFO ] Flatten gal took : 202 ms
[2023-03-19 11:39:42] [INFO ] Flatten gal took : 304 ms
[2023-03-19 11:39:42] [INFO ] Input system was already deterministic with 2744 transitions.
Starting structural reductions in SI_CTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 13 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in SI_CTL mode , in 1 iterations and 15 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:42] [INFO ] Flatten gal took : 98 ms
[2023-03-19 11:39:43] [INFO ] Flatten gal took : 110 ms
[2023-03-19 11:39:43] [INFO ] Input system was already deterministic with 2744 transitions.
Finished random walk after 168 steps, including 0 resets, run visited all 1 properties in 30 ms. (steps per millisecond=5 )
FORMULA Sudoku-PT-AN14-CTLFireability-07 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Starting structural reductions in LTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 114 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in LTL mode , in 1 iterations and 115 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:43] [INFO ] Flatten gal took : 72 ms
[2023-03-19 11:39:43] [INFO ] Flatten gal took : 84 ms
[2023-03-19 11:39:43] [INFO ] Input system was already deterministic with 2744 transitions.
Starting structural reductions in LTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 82 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in LTL mode , in 1 iterations and 83 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:43] [INFO ] Flatten gal took : 72 ms
[2023-03-19 11:39:44] [INFO ] Flatten gal took : 80 ms
[2023-03-19 11:39:44] [INFO ] Input system was already deterministic with 2744 transitions.
Starting structural reductions in LTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 59 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in LTL mode , in 1 iterations and 60 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:44] [INFO ] Flatten gal took : 71 ms
[2023-03-19 11:39:44] [INFO ] Flatten gal took : 80 ms
[2023-03-19 11:39:44] [INFO ] Input system was already deterministic with 2744 transitions.
Starting structural reductions in SI_CTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 129 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in SI_CTL mode , in 1 iterations and 129 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:44] [INFO ] Flatten gal took : 73 ms
[2023-03-19 11:39:44] [INFO ] Flatten gal took : 80 ms
[2023-03-19 11:39:45] [INFO ] Input system was already deterministic with 2744 transitions.
Starting structural reductions in SI_CTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 64 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in SI_CTL mode , in 1 iterations and 64 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:45] [INFO ] Flatten gal took : 70 ms
[2023-03-19 11:39:45] [INFO ] Flatten gal took : 77 ms
[2023-03-19 11:39:45] [INFO ] Input system was already deterministic with 2744 transitions.
Starting structural reductions in LTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 47 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in LTL mode , in 1 iterations and 47 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:45] [INFO ] Flatten gal took : 67 ms
[2023-03-19 11:39:45] [INFO ] Flatten gal took : 75 ms
[2023-03-19 11:39:45] [INFO ] Input system was already deterministic with 2744 transitions.
Starting structural reductions in SI_CTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 64 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in SI_CTL mode , in 1 iterations and 64 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:45] [INFO ] Flatten gal took : 70 ms
[2023-03-19 11:39:46] [INFO ] Flatten gal took : 79 ms
[2023-03-19 11:39:46] [INFO ] Input system was already deterministic with 2744 transitions.
Starting structural reductions in LTL mode, iteration 0 : 588/588 places, 2744/2744 transitions.
Applied a total of 0 rules in 50 ms. Remains 588 /588 variables (removed 0) and now considering 2744/2744 (removed 0) transitions.
Finished structural reductions in LTL mode , in 1 iterations and 51 ms. Remains : 588/588 places, 2744/2744 transitions.
[2023-03-19 11:39:46] [INFO ] Flatten gal took : 70 ms
[2023-03-19 11:39:46] [INFO ] Flatten gal took : 79 ms
[2023-03-19 11:39:46] [INFO ] Input system was already deterministic with 2744 transitions.
[2023-03-19 11:39:47] [INFO ] Flatten gal took : 511 ms
[2023-03-19 11:39:51] [INFO ] Flatten gal took : 511 ms
[2023-03-19 11:39:54] [INFO ] Export to MCC of 13 properties in file /home/mcc/execution/CTLFireability.sr.xml took 157 ms.
[2023-03-19 11:39:54] [INFO ] Export to PNML in file /home/mcc/execution/model.sr.pnml of net with 588 places, 2744 transitions and 8232 arcs took 10 ms.
Total runtime 86354 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=CTLFireability.xml --memory=6 --mcc-mode

parse successfull
net created successfully

Net: Petri
(NrP: 588 NrTr: 2744 NrArc: 8232)

parse formulas
formulas created successfully
place and transition orderings generation:0m 0.207sec

net check time: 0m 0.001sec

init dd package: 0m 2.621sec

TIME LIMIT: Killed by timeout after 3600 seconds
MemTotal: 16393216 kB
MemFree: 9428492 kB
After kill :
MemTotal: 16393216 kB
MemFree: 15984476 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_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination CTLFireability -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 0.019sec

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="Sudoku-PT-AN14"
export BK_EXAMINATION="CTLFireability"
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 Sudoku-PT-AN14, examination is CTLFireability"
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-167912708400266"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/Sudoku-PT-AN14.tgz
mv Sudoku-PT-AN14 execution
cd execution
if [ "CTLFireability" = "ReachabilityDeadlock" ] || [ "CTLFireability" = "UpperBounds" ] || [ "CTLFireability" = "QuasiLiveness" ] || [ "CTLFireability" = "StableMarking" ] || [ "CTLFireability" = "Liveness" ] || [ "CTLFireability" = "OneSafe" ] || [ "CTLFireability" = "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 [ "CTLFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "CTLFireability" != "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 "CTLFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property CTLFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "CTLFireability.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 '' CTLFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "CTLFireability" = "ReachabilityDeadlock" ] || [ "CTLFireability" = "QuasiLiveness" ] || [ "CTLFireability" = "StableMarking" ] || [ "CTLFireability" = "Liveness" ] || [ "CTLFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME CTLFireability"
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 ;