Execution Chart

Sorry, for this execution, no execution chart could be reported.

Trace from the execution

Formatting '/data/fkordon/mcc2025-input.r114-tall-174876423200702.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2025-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 2-5832
Executing tool itstools
Input is LamportFastMutEx-PT-8, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r114-tall-174876423200702
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 2.1M
-rw-r--r-- 1 mcc users 29K May 29 14:47 CTLCardinality.txt
-rw-r--r-- 1 mcc users 175K May 29 14:47 CTLCardinality.xml
-rw-r--r-- 1 mcc users 48K May 29 14:47 CTLFireability.txt
-rw-r--r-- 1 mcc users 263K May 29 14:47 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 29 14:32 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.6K May 29 14:32 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 13K May 29 14:47 LTLCardinality.txt
-rw-r--r-- 1 mcc users 61K May 29 14:47 LTLCardinality.xml
-rw-r--r-- 1 mcc users 20K May 29 14:47 LTLFireability.txt
-rw-r--r-- 1 mcc users 83K May 29 14:47 LTLFireability.xml
-rw-r--r-- 1 mcc users 55K May 29 14:47 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 310K May 29 14:47 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 113K May 29 14:47 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 582K May 29 14:47 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 2.7K May 29 14:47 UpperBounds.txt
-rw-r--r-- 1 mcc users 6.3K May 29 14:47 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 May 29 14:32 equiv_col
-rw-r--r-- 1 mcc users 2 May 29 14:32 instance
-rw-r--r-- 1 mcc users 6 May 29 14:32 iscolored
-rw-r--r-- 1 mcc users 329K May 29 14:32 model.pnml

--------------------
content from stdout:

=== Data for post analysis generated by BenchKit (invocation template)

The expected result is a vector of booleans
BOOL_VECTOR

echo here is the order used to build the result vector(from xml file)
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-00
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-01
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-02
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-03
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-04
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-05
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-06
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-07
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-08
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-09
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-10
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-11
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-12
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-13
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-14
FORMULA_NAME LamportFastMutEx-PT-8-ReachabilityCardinality-2025-15

=== Now, execution of the tool begins

BK_START 1748889072398

Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=ReachabilityCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=LamportFastMutEx-PT-8
BK_MEMORY_CONFINEMENT=16384
Not applying reductions.
Model is PT
ReachabilityCardinality PT
Running Version 202505121319
[2025-06-02 18:31:13] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2025-06-02 18:31:13] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2025-06-02 18:31:14] [INFO ] Load time of PNML (sax parser for PT used): 107 ms
[2025-06-02 18:31:14] [INFO ] Transformed 315 places.
[2025-06-02 18:31:14] [INFO ] Transformed 666 transitions.
[2025-06-02 18:31:14] [INFO ] Found NUPN structural information;
[2025-06-02 18:31:14] [INFO ] Completing missing partition info from NUPN : creating a component with [P_start_1_0, P_start_1_1, P_start_1_2, P_start_1_3, P_start_1_4, P_start_1_5, P_start_1_6, P_start_1_7, P_start_1_8, P_b_0_false, P_b_0_true, P_b_1_false, P_b_1_true, P_b_2_false, P_b_2_true, P_b_3_false, P_b_3_true, P_b_4_false, P_b_4_true, P_b_5_false, P_b_5_true, P_b_6_false, P_b_6_true, P_b_7_false, P_b_7_true, P_b_8_false, P_b_8_true, P_setx_3_0, P_setx_3_1, P_setx_3_2, P_setx_3_3, P_setx_3_4, P_setx_3_5, P_setx_3_6, P_setx_3_7, P_setx_3_8, P_setbi_5_0, P_setbi_5_1, P_setbi_5_2, P_setbi_5_3, P_setbi_5_4, P_setbi_5_5, P_setbi_5_6, P_setbi_5_7, P_setbi_5_8, P_ify0_4_0, P_ify0_4_1, P_ify0_4_2, P_ify0_4_3, P_ify0_4_4, P_ify0_4_5, P_ify0_4_6, P_ify0_4_7, P_ify0_4_8, P_sety_9_0, P_sety_9_1, P_sety_9_2, P_sety_9_3, P_sety_9_4, P_sety_9_5, P_sety_9_6, P_sety_9_7, P_sety_9_8, P_ifxi_10_0, P_ifxi_10_1, P_ifxi_10_2, P_ifxi_10_3, P_ifxi_10_4, P_ifxi_10_5, P_ifxi_10_6, P_ifxi_10_7, P_ifxi_10_8, P_setbi_11_0, P_setbi_11_1, P_setbi_11_2, P_setbi_11_3, P_setbi_11_4, P_setbi_11_5, P_setbi_11_6, P_setbi_11_7, P_setbi_11_8, P_fordo_12_0, P_fordo_12_1, P_fordo_12_2, P_fordo_12_3, P_fordo_12_4, P_fordo_12_5, P_fordo_12_6, P_fordo_12_7, P_fordo_12_8, P_wait_0_0, P_wait_0_1, P_wait_0_2, P_wait_0_3, P_wait_0_4, P_wait_0_5, P_wait_0_6, P_wait_0_7, P_wait_0_8, P_wait_1_0, P_wait_1_1, P_wait_1_2, P_wait_1_3, P_wait_1_4, P_wait_1_5, P_wait_1_6, P_wait_1_7, P_wait_1_8, P_wait_2_0, P_wait_2_1, P_wait_2_2, P_wait_2_3, P_wait_2_4, P_wait_2_5, P_wait_2_6, P_wait_2_7, P_wait_2_8, P_wait_3_0, P_wait_3_1, P_wait_3_2, P_wait_3_3, P_wait_3_4, P_wait_3_5, P_wait_3_6, P_wait_3_7, P_wait_3_8, P_wait_4_0, P_wait_4_1, P_wait_4_2, P_wait_4_3, P_wait_4_4, P_wait_4_5, P_wait_4_6, P_wait_4_7, P_wait_4_8, P_wait_5_0, P_wait_5_1, P_wait_5_2, P_wait_5_3, P_wait_5_4, P_wait_5_5, P_wait_5_6, P_wait_5_7, P_wait_5_8, P_wait_6_0, P_wait_6_1, P_wait_6_2, P_wait_6_3, P_wait_6_4, P_wait_6_5, P_wait_6_6, P_wait_6_7, P_wait_6_8, P_wait_7_0, P_wait_7_1, P_wait_7_2, P_wait_7_3, P_wait_7_4, P_wait_7_5, P_wait_7_6, P_wait_7_7, P_wait_7_8, P_wait_8_0, P_wait_8_1, P_wait_8_2, P_wait_8_3, P_wait_8_4, P_wait_8_5, P_wait_8_6, P_wait_8_7, P_wait_8_8, P_await_13_0, P_await_13_1, P_await_13_2, P_await_13_3, P_await_13_4, P_await_13_5, P_await_13_6, P_await_13_7, P_await_13_8, P_done_0_0, P_done_0_1, P_done_0_2, P_done_0_3, P_done_0_4, P_done_0_5, P_done_0_6, P_done_0_7, P_done_0_8, P_done_1_0, P_done_1_1, P_done_1_2, P_done_1_3, P_done_1_4, P_done_1_5, P_done_1_6, P_done_1_7, P_done_1_8, P_done_2_0, P_done_2_1, P_done_2_2, P_done_2_3, P_done_2_4, P_done_2_5, P_done_2_6, P_done_2_7, P_done_2_8, P_done_3_0, P_done_3_1, P_done_3_2, P_done_3_3, P_done_3_4, P_done_3_5, P_done_3_6, P_done_3_7, P_done_3_8, P_done_4_0, P_done_4_1, P_done_4_2, P_done_4_3, P_done_4_4, P_done_4_5, P_done_4_6, P_done_4_7, P_done_4_8, P_done_5_0, P_done_5_1, P_done_5_2, P_done_5_3, P_done_5_4, P_done_5_5, P_done_5_6, P_done_5_7, P_done_5_8, P_done_6_0, P_done_6_1, P_done_6_2, P_done_6_3, P_done_6_4, P_done_6_5, P_done_6_6, P_done_6_7, P_done_6_8, P_done_7_0, P_done_7_1, P_done_7_2, P_done_7_3, P_done_7_4, P_done_7_5, P_done_7_6, P_done_7_7, P_done_7_8, P_done_8_0, P_done_8_1, P_done_8_2, P_done_8_3, P_done_8_4, P_done_8_5, P_done_8_6, P_done_8_7, P_done_8_8, P_ifyi_15_0, P_ifyi_15_1, P_ifyi_15_2, P_ifyi_15_3, P_ifyi_15_4, P_ifyi_15_5, P_ifyi_15_6, P_ifyi_15_7, P_ifyi_15_8, P_awaity_0, P_awaity_1, P_awaity_2, P_awaity_3, P_awaity_4, P_awaity_5, P_awaity_6, P_awaity_7, P_awaity_8, P_CS_21_0, P_CS_21_1, P_CS_21_2, P_CS_21_3, P_CS_21_4, P_CS_21_5, P_CS_21_6, P_CS_21_7, P_CS_21_8, P_setbi_24_0, P_setbi_24_1, P_setbi_24_2, P_setbi_24_3, P_setbi_24_4, P_setbi_24_5, P_setbi_24_6, P_setbi_24_7, P_setbi_24_8]
[2025-06-02 18:31:14] [INFO ] Parsed PT model containing 315 places and 666 transitions and 2934 arcs in 217 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 26 ms.
Working with output stream class java.io.PrintStream
Deduced a syphon composed of 49 places in 3 ms
Reduce places removed 49 places and 82 transitions.
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-01 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-02 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-10 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-11 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
RANDOM walk for 40000 steps (8 resets) in 2029 ms. (19 steps per ms) remains 5/12 properties
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-15 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-14 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-13 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-09 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-08 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-06 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-03 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
[2025-06-02 18:31:14] [INFO ] Flatten gal took : 151 ms
[2025-06-02 18:31:14] [INFO ] Flatten gal took : 54 ms
[2025-06-02 18:31:14] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality8063299280565182086.gal : 36 ms
[2025-06-02 18:31:14] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality5711812396034213121.prop : 12 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202505121319/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality8063299280565182086.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality5711812396034213121.prop' '--nowitness' '--gen-order' 'FOLLOW'

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202505121319/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...328
BEST_FIRST walk for 40004 steps (8 resets) in 1110 ms. (36 steps per ms) remains 5/5 properties
Loading property file /tmp/ReachabilityCardinality5711812396034213121.prop.
BEST_FIRST walk for 40004 steps (8 resets) in 208 ms. (191 steps per ms) remains 5/5 properties
SDD proceeding with computation,5 properties remain. new max is 4
SDD size :1 after 2
SDD proceeding with computation,5 properties remain. new max is 8
SDD size :2 after 4
SDD proceeding with computation,5 properties remain. new max is 16
SDD size :4 after 8
BEST_FIRST walk for 40004 steps (8 resets) in 247 ms. (161 steps per ms) remains 5/5 properties
SDD proceeding with computation,5 properties remain. new max is 32
SDD size :8 after 42
SDD proceeding with computation,5 properties remain. new max is 64
SDD size :42 after 46
SDD proceeding with computation,5 properties remain. new max is 128
SDD size :46 after 57
SDD proceeding with computation,5 properties remain. new max is 256
SDD size :57 after 72
SDD proceeding with computation,5 properties remain. new max is 512
SDD size :72 after 390
SDD proceeding with computation,5 properties remain. new max is 1024
SDD size :390 after 806
BEST_FIRST walk for 40004 steps (8 resets) in 1095 ms. (36 steps per ms) remains 4/5 properties
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-05 FALSE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
BEST_FIRST walk for 40003 steps (8 resets) in 191 ms. (208 steps per ms) remains 3/4 properties
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-12 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
[2025-06-02 18:31:15] [INFO ] Flow matrix only has 416 transitions (discarded 168 similar events)
// Phase 1: matrix 416 rows 266 cols
[2025-06-02 18:31:15] [INFO ] Computed 82 invariants in 17 ms
[2025-06-02 18:31:15] [INFO ] State equation strengthened by 112 read => feed constraints.
Excessive predecessor constraint size, skipping predecessor.
SDD proceeding with computation,5 properties remain. new max is 2048
SDD size :806 after 2575
Starting Z3 with timeout 5.0 s and query timeout 500.0 ms
Problem LamportFastMutEx-PT-8-ReachabilityCardinality-2025-00 is UNSAT
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-00 FALSE TECHNIQUES SMT_REFINEMENT
Problem LamportFastMutEx-PT-8-ReachabilityCardinality-2025-04 is UNSAT
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-04 TRUE TECHNIQUES SMT_REFINEMENT
Problem LamportFastMutEx-PT-8-ReachabilityCardinality-2025-07 is UNSAT
FORMULA LamportFastMutEx-PT-8-ReachabilityCardinality-2025-07 TRUE TECHNIQUES SMT_REFINEMENT
After SMT solving in domain Real declared 232/682 variables, and 232 constraints, problems are : Problem set: 3 solved, 0 unsolved in 324 ms.
Refiners :[Domain max(s): 232/266 constraints, Positive P Invariants (semi-flows): 0/82 constraints, State Equation: 0/266 constraints, ReadFeed: 0/112 constraints, PredecessorRefiner: 1/1 constraints, Known Traps: 0/0 constraints, Known Traps Along Path: 0/0 constraints]
After SMT, in 415ms problems are : Problem set: 3 solved, 0 unsolved
Skipping Parikh replay, no witness traces provided.
ITS runner timed out or was interrupted.
ITS tools runner thread asked to quit. Dying gracefully.
All properties solved without resorting to model-checking.
Total runtime 2259 ms.

BK_STOP 1748889076103

--------------------
content from stderr:

+ export BINDIR=/home/mcc/BenchKit/bin//../itstools/bin//../
+ BINDIR=/home/mcc/BenchKit/bin//../itstools/bin//../
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ ReachabilityCardinality = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution ReachabilityCardinality -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600
+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202505121319.jar
+ VERSION=202505121319
+ echo 'Running Version 202505121319'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityCardinality -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600

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="LamportFastMutEx-PT-8"
export BK_EXAMINATION="ReachabilityCardinality"
export BK_TOOL="itstools"
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 2-5832"
echo " Executing tool itstools"
echo " Input is LamportFastMutEx-PT-8, 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 r114-tall-174876423200702"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/LamportFastMutEx-PT-8.tgz
mv LamportFastMutEx-PT-8 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.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 ;