Execution Chart

We display below the execution chart for this examination (boot time has been removed).

Trace from the execution

Formatting '/data/fkordon/mcc2026-input.r162-smll-177961107900416.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2026-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 2-5973
Executing tool itstools
Input is LamportFastMutEx-PT-4, examination is StateSpace
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r162-smll-177961107900416
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 928K
-rw-r--r-- 1 mcc users 14K Mar 7 16:44 CTLCardinality.txt
-rw-r--r-- 1 mcc users 99K Mar 7 16:44 CTLCardinality.xml
-rw-r--r-- 1 mcc users 23K Mar 7 16:44 CTLFireability.txt
-rw-r--r-- 1 mcc users 140K Mar 7 16:44 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Mar 3 18:30 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 7.6K Mar 15 11:11 LTLCardinality.txt
-rw-r--r-- 1 mcc users 39K Mar 15 11:11 LTLCardinality.xml
-rw-r--r-- 1 mcc users 7.7K Mar 15 11:11 LTLFireability.txt
-rw-r--r-- 1 mcc users 37K Mar 15 11:11 LTLFireability.xml
-rw-r--r-- 1 mcc users 27K Mar 7 16:44 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 170K Mar 7 16:44 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 30K Mar 7 16:44 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 172K Mar 7 16:44 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 2.4K Mar 15 11:11 UpperBounds.txt
-rw-r--r-- 1 mcc users 5.5K Mar 15 11:11 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 Mar 3 18:30 equiv_col
-rw-r--r-- 1 mcc users 2 Mar 3 18:30 instance
-rw-r--r-- 1 mcc users 6 Mar 3 18:30 iscolored
-rw-r--r-- 1 mcc users 114K Mar 3 18:30 model.pnml

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

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

no data necessary for post analysis


=== Now, execution of the tool begins

BK_START 1779876961002

Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=StateSpace
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=LamportFastMutEx-PT-4
BK_MEMORY_CONFINEMENT=16384
Not applying reductions.
Model is PT
StateSpace PT
Running Version 202604301425
[2026-05-27 10:16:03] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, StateSpace, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2026-05-27 10:16:03] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2026-05-27 10:16:03] [INFO ] Load time of PNML (sax parser for PT used): 183 ms
[2026-05-27 10:16:03] [INFO ] Transformed 135 places.
[2026-05-27 10:16:03] [INFO ] Transformed 230 transitions.
[2026-05-27 10:16:03] [INFO ] Found NUPN structural information;
[2026-05-27 10:16:03] [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_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_setx_3_0, P_setx_3_1, P_setx_3_2, P_setx_3_3, P_setx_3_4, P_setbi_5_0, P_setbi_5_1, P_setbi_5_2, P_setbi_5_3, P_setbi_5_4, P_ify0_4_0, P_ify0_4_1, P_ify0_4_2, P_ify0_4_3, P_ify0_4_4, P_sety_9_0, P_sety_9_1, P_sety_9_2, P_sety_9_3, P_sety_9_4, P_ifxi_10_0, P_ifxi_10_1, P_ifxi_10_2, P_ifxi_10_3, P_ifxi_10_4, P_setbi_11_0, P_setbi_11_1, P_setbi_11_2, P_setbi_11_3, P_setbi_11_4, P_fordo_12_0, P_fordo_12_1, P_fordo_12_2, P_fordo_12_3, P_fordo_12_4, P_wait_0_0, P_wait_0_1, P_wait_0_2, P_wait_0_3, P_wait_0_4, P_wait_1_0, P_wait_1_1, P_wait_1_2, P_wait_1_3, P_wait_1_4, P_wait_2_0, P_wait_2_1, P_wait_2_2, P_wait_2_3, P_wait_2_4, P_wait_3_0, P_wait_3_1, P_wait_3_2, P_wait_3_3, P_wait_3_4, P_wait_4_0, P_wait_4_1, P_wait_4_2, P_wait_4_3, P_wait_4_4, P_await_13_0, P_await_13_1, P_await_13_2, P_await_13_3, P_await_13_4, P_done_0_0, P_done_0_1, P_done_0_2, P_done_0_3, P_done_0_4, P_done_1_0, P_done_1_1, P_done_1_2, P_done_1_3, P_done_1_4, P_done_2_0, P_done_2_1, P_done_2_2, P_done_2_3, P_done_2_4, P_done_3_0, P_done_3_1, P_done_3_2, P_done_3_3, P_done_3_4, P_done_4_0, P_done_4_1, P_done_4_2, P_done_4_3, P_done_4_4, P_ifyi_15_0, P_ifyi_15_1, P_ifyi_15_2, P_ifyi_15_3, P_ifyi_15_4, P_awaity_0, P_awaity_1, P_awaity_2, P_awaity_3, P_awaity_4, P_CS_21_0, P_CS_21_1, P_CS_21_2, P_CS_21_3, P_CS_21_4, P_setbi_24_0, P_setbi_24_1, P_setbi_24_2, P_setbi_24_3, P_setbi_24_4]
[2026-05-27 10:16:03] [INFO ] Parsed PT model containing 135 places and 230 transitions and 990 arcs in 397 ms.
Deduced a syphon composed of 33 places in 3 ms
Reduce places removed 33 places and 50 transitions.
Starting structural reductions in STATESPACE mode, iteration 0 : 102/102 places, 180/180 transitions.
[2026-05-27 10:16:04] [INFO ] Redundant transitions in 12 ms returned []
Running 176 sub problems to find dead transitions.
[2026-05-27 10:16:04] [INFO ] Flow matrix only has 144 transitions (discarded 36 similar events)
Running PetriSpot : '/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.petrispot.binaries_1.0.0.202604301425/bin/petri64' '--loadKERS=/tmp/petrispot-input-11145677658308323158.kers' '--Pflows' '--basisKERS=/tmp/petrispot-output-17790430728938160600.kers'
[2026-05-27 10:16:04] [INFO ] Running PetriSpot with arguments : [--loadKERS=/tmp/petrispot-input-11145677658308323158.kers, --Pflows, --basisKERS=/tmp/petrispot-output-17790430728938160600.kers]
Culling duplicate invariants (modulo rational): removing 4 columns.
Culled 4 columns in 0 ms.
// Phase 1: matrix 144 rows 98 cols 432 entries
Finished phase 1 with 76 SingleSign rule and 0 generalized
[2026-05-27 10:16:04] [INFO ] Computed 26 invariants in 1 ms
Computed 26 P flows in 2 ms.
Exported basis to /tmp/petrispot-output-17790430728938160600.kers
Total runtime 2 ms.
[2026-05-27 10:16:04] [INFO ] State equation strengthened by 40 read => feed constraints.
At refinement iteration 0 (INCLUDED_ONLY) 0/102 variables, 102/102 constraints. Problems are: Problem set: 0 solved, 176 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/102 variables, 26/128 constraints. Problems are: Problem set: 0 solved, 176 unsolved
Problem TDEAD1 is UNSAT
Problem TDEAD3 is UNSAT
Problem TDEAD5 is UNSAT
Problem TDEAD7 is UNSAT
Problem TDEAD28 is UNSAT
Problem TDEAD33 is UNSAT
Problem TDEAD38 is UNSAT
Problem TDEAD43 is UNSAT
Problem TDEAD44 is UNSAT
Problem TDEAD46 is UNSAT
Problem TDEAD48 is UNSAT
Problem TDEAD50 is UNSAT
Problem TDEAD1 is UNSAT
Problem TDEAD3 is UNSAT
Problem TDEAD5 is UNSAT
Problem TDEAD7 is UNSAT
Problem TDEAD28 is UNSAT
Problem TDEAD33 is UNSAT
Problem TDEAD38 is UNSAT
Problem TDEAD43 is UNSAT
Problem TDEAD44 is UNSAT
Problem TDEAD46 is UNSAT
Problem TDEAD48 is UNSAT
Problem TDEAD50 is UNSAT
Problem TDEAD61 is UNSAT
Problem TDEAD67 is UNSAT
Problem TDEAD73 is UNSAT
Problem TDEAD79 is UNSAT
Problem TDEAD84 is UNSAT
Problem TDEAD96 is UNSAT
Problem TDEAD98 is UNSAT
Problem TDEAD100 is UNSAT
Problem TDEAD102 is UNSAT
At refinement iteration 2 (INCLUDED_ONLY) 0/102 variables, 20/148 constraints. Problems are: Problem set: 21 solved, 155 unsolved
Problem TDEAD80 is UNSAT
Problem TDEAD88 is UNSAT
Problem TDEAD92 is UNSAT
Problem TDEAD80 is UNSAT
Problem TDEAD88 is UNSAT
Problem TDEAD92 is UNSAT
At refinement iteration 3 (INCLUDED_ONLY) 0/102 variables, 20/168 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/102 variables, 7/175 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 5 (INCLUDED_ONLY) 0/102 variables, 1/176 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/102 variables, 0/176 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 7 (OVERLAPS) 144/246 variables, 102/278 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 8 (INCLUDED_ONLY) 0/246 variables, 40/318 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 9 (INCLUDED_ONLY) 0/246 variables, 4/322 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 10 (INCLUDED_ONLY) 0/246 variables, 4/326 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 11 (INCLUDED_ONLY) 0/246 variables, 4/330 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 12 (INCLUDED_ONLY) 0/246 variables, 2/332 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 13 (INCLUDED_ONLY) 0/246 variables, 1/333 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 14 (INCLUDED_ONLY) 0/246 variables, 3/336 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 15 (INCLUDED_ONLY) 0/246 variables, 1/337 constraints. Problems are: Problem set: 24 solved, 152 unsolved
Solver is answering 'unknown', stopping.
After SMT solving in domain Real declared 246/246 variables, and 337 constraints, problems are : Problem set: 24 solved, 152 unsolved in 30023 ms.
Refiners :[Domain max(s): 102/102 constraints, Positive P Invariants (semi-flows): 26/26 constraints, State Equation: 102/102 constraints, ReadFeed: 40/40 constraints, PredecessorRefiner: 176/176 constraints, Known Traps: 67/67 constraints, Known Traps Along Path: 0/0 constraints]
Escalating to Integer solving :Problem set: 24 solved, 152 unsolved
At refinement iteration 0 (INCLUDED_ONLY) 0/98 variables, 98/98 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/98 variables, 6/104 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 2 (INCLUDED_ONLY) 0/98 variables, 49/153 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/98 variables, 0/153 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 4 (OVERLAPS) 4/102 variables, 20/173 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 5 (INCLUDED_ONLY) 0/102 variables, 4/177 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/102 variables, 18/195 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/102 variables, 0/195 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 8 (OVERLAPS) 144/246 variables, 102/297 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 9 (INCLUDED_ONLY) 0/246 variables, 40/337 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 10 (INCLUDED_ONLY) 0/246 variables, 152/489 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 11 (INCLUDED_ONLY) 0/246 variables, 3/492 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 12 (INCLUDED_ONLY) 0/246 variables, 4/496 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 13 (INCLUDED_ONLY) 0/246 variables, 1/497 constraints. Problems are: Problem set: 24 solved, 152 unsolved
At refinement iteration 14 (INCLUDED_ONLY) 0/246 variables, 0/497 constraints. Problems are: Problem set: 24 solved, 152 unsolved
Solver is answering 'unknown', stopping.
After SMT solving in domain Int declared 246/246 variables, and 500 constraints, problems are : Problem set: 24 solved, 152 unsolved in 30019 ms.
Refiners :[Domain max(s): 102/102 constraints, Positive P Invariants (semi-flows): 26/26 constraints, State Equation: 102/102 constraints, ReadFeed: 40/40 constraints, PredecessorRefiner: 152/176 constraints, Known Traps: 77/77 constraints, Known Traps Along Path: 1/1 constraints]
After SMT, in 60308ms problems are : Problem set: 24 solved, 152 unsolved
Search for dead transitions found 24 dead transitions in 60329ms
Found 24 dead transitions using SMT.
Drop transitions (Dead Transitions using SMT only with invariants) removed 24 transitions
Dead transitions reduction (with SMT) removed 24 transitions
Starting structural reductions in STATESPACE mode, iteration 1 : 102/102 places, 156/180 transitions.
[2026-05-27 10:17:04] [INFO ] Redundant transitions in 6 ms returned []
Finished structural reductions in STATESPACE mode , in 2 iterations and 60599 ms. Remains : 102/102 places, 156/180 transitions.
Final net has 102 places and 156 transitions.
[2026-05-27 10:17:04] [INFO ] Flatten gal took : 68 ms
[2026-05-27 10:17:04] [INFO ] Applying decomposition
[2026-05-27 10:17:04] [INFO ] Flatten gal took : 23 ms
Converted graph to binary with : '/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.louvain.binaries_1.0.0.202604301425/bin/convert-linux64' '-i' '/tmp/graph1744261816739664616.txt' '-o' '/tmp/graph1744261816739664616.bin' '-w' '/tmp/graph1744261816739664616.weights'
Built communities with : '/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.louvain.binaries_1.0.0.202604301425/bin/louvain-linux64' '/tmp/graph1744261816739664616.bin' '-l' '-1' '-v' '-w' '/tmp/graph1744261816739664616.weights' '-q' '0' '-e' '0.001'
[2026-05-27 10:17:04] [INFO ] Decomposing Gal with order
[2026-05-27 10:17:04] [INFO ] Rewriting arrays to variables to allow decomposition.
[2026-05-27 10:17:05] [INFO ] Removed a total of 170 redundant transitions.
[2026-05-27 10:17:05] [INFO ] Flatten gal took : 104 ms
[2026-05-27 10:17:05] [INFO ] Fuse similar labels procedure discarded/fused a total of 44 labels/synchronizations in 14 ms.
[2026-05-27 10:17:05] [INFO ] Time to serialize gal into /tmp/StateSpace15899410504116633212.gal : 17 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202604301425/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/StateSpace15899410504116633212.gal' '-t' 'CGAL' '--stats'

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202604301425/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...220
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
petri\_inst\_inst\_mod\_flat,1.91478e+06,11.454,235396,2134,96,324359,781,454,1.23383e+06,79,5081,0
Total reachable state count : 1914784

Max variable value : 1
STATE_SPACE MAX_TOKEN_IN_PLACE 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Maximum sum along a path : 22
STATE_SPACE MAX_TOKEN_PER_MARKING 22 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Exact state count : 1914784
STATE_SPACE STATES 1914784 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Total runtime 73327 ms.

BK_STOP 1779877036777

--------------------
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
+ [[ StateSpace = StateSpace ]]
+ [[ -f modelMain.xml ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution StateSpace -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_1.0.0.202604301425.jar
+ VERSION=202604301425
+ echo 'Running Version 202604301425'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination StateSpace -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-4"
export BK_EXAMINATION="StateSpace"
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 2-5973"
echo " Executing tool itstools"
echo " Input is LamportFastMutEx-PT-4, examination is StateSpace"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r162-smll-177961107900416"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/LamportFastMutEx-PT-4.tgz
mv LamportFastMutEx-PT-4 execution
cd execution
if [ "StateSpace" = "ReachabilityDeadlock" ] || [ "StateSpace" = "UpperBounds" ] || [ "StateSpace" = "QuasiLiveness" ] || [ "StateSpace" = "StableMarking" ] || [ "StateSpace" = "Liveness" ] || [ "StateSpace" = "OneSafe" ] || [ "StateSpace" = "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 [ "StateSpace" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "StateSpace" != "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 "StateSpace.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 '' StateSpace.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "StateSpace" = "ReachabilityDeadlock" ] || [ "StateSpace" = "QuasiLiveness" ] || [ "StateSpace" = "StableMarking" ] || [ "StateSpace" = "Liveness" ] || [ "StateSpace" = "OneSafe" ] ; then
echo "FORMULA_NAME StateSpace"
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 ;