About the Execution of LoLa+red for SafeBus-COL-10
| Execution Summary | |||||
| Max Memory Used (MB) |
Time wait (ms) | CPU Usage (ms) | I/O Wait (ms) | Computed Result | Execution Status |
| 13420.096 | 1800000.00 | 6988487.00 | 660.30 | [undef] | Time out reached |
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.r373-smll-167891824400139.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 lolaxred
Input is SafeBus-COL-10, examination is Liveness
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r373-smll-167891824400139
=====================================================================
--------------------
preparation of the directory to be used:
/home/mcc/execution
total 456K
-rw-r--r-- 1 mcc users 6.5K Feb 26 01:40 CTLCardinality.txt
-rw-r--r-- 1 mcc users 67K Feb 26 01:40 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.9K Feb 26 01:37 CTLFireability.txt
-rw-r--r-- 1 mcc users 66K Feb 26 01:37 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:41 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 3.7K Feb 25 16:49 LTLCardinality.txt
-rw-r--r-- 1 mcc users 25K Feb 25 16:49 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K Feb 25 16:49 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Feb 25 16:49 LTLFireability.xml
-rw-r--r-- 1 mcc users 9.8K Feb 26 01:52 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 97K Feb 26 01:52 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 7.0K Feb 26 01:51 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 53K Feb 26 01:51 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Feb 25 16:49 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Feb 25 16:49 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 equiv_pt
-rw-r--r-- 1 mcc users 3 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 42K 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
FORMULA_NAME Liveness
=== Now, execution of the tool begins
BK_START 1679041592937
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=lolaxred
BK_EXAMINATION=Liveness
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=1800
BK_INPUT=SafeBus-COL-10
Applying reductions before tool lola
Invoking reducer
Running Version 202303021504
[2023-03-17 08:26:36] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, Liveness, -timeout, 180, -rebuildPNML]
[2023-03-17 08:26:36] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-17 08:26:36] [INFO ] Detected file is not PT type :http://www.pnml.org/version-2009/grammar/symmetricnet
log4j:WARN No appenders could be found for logger (org.apache.axiom.locator.DefaultOMMetaFactoryLocator).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.
[2023-03-17 08:26:36] [WARNING] Using fallBack plugin, rng conformance not checked
[2023-03-17 08:26:37] [INFO ] Load time of PNML (colored model parsed with PNMLFW) : 1044 ms
[2023-03-17 08:26:37] [INFO ] Detected 1 constant HL places corresponding to 10 PT places.
[2023-03-17 08:26:37] [INFO ] Imported 20 HL places and 14 HL transitions for a total of 326 PT places and 12821.0 transition bindings in 47 ms.
[2023-03-17 08:26:37] [INFO ] Built PT skeleton of HLPN with 20 places and 14 transitions 68 arcs in 8 ms.
[2023-03-17 08:26:37] [INFO ] Skeletonized 0 HLPN properties in 0 ms.
[2023-03-17 08:26:37] [INFO ] Unfolded HLPN to a Petri net with 326 places and 1651 transitions 11294 arcs in 120 ms.
[2023-03-17 08:26:37] [INFO ] Unfolded 0 HLPN properties in 0 ms.
[2023-03-17 08:26:37] [INFO ] Unfolded HLPN to a Petri net with 326 places and 1651 transitions 11294 arcs in 54 ms.
[2023-03-17 08:26:37] [INFO ] Unfolded 14 HLPN properties in 1 ms.
[2023-03-17 08:26:37] [INFO ] Reduced 80 identical enabling conditions.
[2023-03-17 08:26:37] [INFO ] Built PT skeleton of HLPN with 20 places and 14 transitions 68 arcs in 1 ms.
[2023-03-17 08:26:37] [INFO ] Skeletonized 14 HLPN properties in 2 ms.
Reduce places removed 3 places and 0 transitions.
Computed a total of 0 stabilizing places and 0 stable transitions
Prefix of Interest using HLPN skeleton for deadlock discarded 0 places and 0 transitions.
Domain [It(10), It(10)] of place AMC breaks symmetries in sort It
[2023-03-17 08:26:37] [INFO ] Unfolded HLPN to a Petri net with 326 places and 1651 transitions 11294 arcs in 38 ms.
[2023-03-17 08:26:37] [INFO ] Unfolded 14 HLPN properties in 1 ms.
[2023-03-17 08:26:37] [INFO ] Reduced 80 identical enabling conditions.
Deduced a syphon composed of 10 places in 10 ms
Reduce places removed 20 places and 20 transitions.
Built sparse matrix representations for Structural reductions in 20 ms.19725KB memory used
Starting structural reductions in DEADLOCK mode, iteration 0 : 306/306 places, 1631/1631 transitions.
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Applied a total of 0 rules in 378 ms. Remains 306 /306 variables (removed 0) and now considering 1631/1631 (removed 0) transitions.
Finished structural reductions in DEADLOCK mode , in 1 iterations and 380 ms. Remains : 306/306 places, 1631/1631 transitions.
Starting structural reductions in DEADLOCK mode, iteration 0 : 306/306 places, 1631/1631 transitions.
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Applied a total of 0 rules in 216 ms. Remains 306 /306 variables (removed 0) and now considering 1631/1631 (removed 0) transitions.
[2023-03-17 08:26:38] [INFO ] Flow matrix only has 642 transitions (discarded 989 similar events)
// Phase 1: matrix 642 rows 306 cols
[2023-03-17 08:26:38] [INFO ] Computed 45 place invariants in 59 ms
[2023-03-17 08:26:38] [INFO ] Implicit Places using invariants in 402 ms returned []
[2023-03-17 08:26:38] [INFO ] Flow matrix only has 642 transitions (discarded 989 similar events)
[2023-03-17 08:26:38] [INFO ] Invariant cache hit.
[2023-03-17 08:26:39] [INFO ] State equation strengthened by 111 read => feed constraints.
[2023-03-17 08:26:39] [INFO ] Implicit Places using invariants and state equation in 558 ms returned []
Implicit Place search using SMT with State Equation took 1002 ms to find 0 implicit places.
[2023-03-17 08:26:39] [INFO ] Redundant transitions in 404 ms returned []
[2023-03-17 08:26:39] [INFO ] Flow matrix only has 642 transitions (discarded 989 similar events)
[2023-03-17 08:26:39] [INFO ] Invariant cache hit.
[2023-03-17 08:26:41] [INFO ] Dead Transitions using invariants and state equation in 1677 ms found 100 transitions.
Found 100 dead transitions using SMT.
Drop transitions removed 100 transitions
Dead transitions reduction (with SMT) removed 100 transitions
Starting structural reductions in DEADLOCK mode, iteration 1 : 306/306 places, 1531/1631 transitions.
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Applied a total of 0 rules in 183 ms. Remains 306 /306 variables (removed 0) and now considering 1531/1531 (removed 0) transitions.
[2023-03-17 08:26:41] [INFO ] Redundant transitions in 94 ms returned []
Finished structural reductions in DEADLOCK mode , in 2 iterations and 3602 ms. Remains : 306/306 places, 1531/1631 transitions.
Random walk for 1250000 steps, including 0 resets, run took 8336 ms (no deadlock found). (steps per millisecond=149 )
Random directed walk for 1250000 steps, including 0 resets, run took 6306 ms (no deadlock found). (steps per millisecond=198 )
[2023-03-17 08:26:56] [INFO ] Flow matrix only has 642 transitions (discarded 889 similar events)
[2023-03-17 08:26:56] [INFO ] Invariant cache hit.
[2023-03-17 08:26:57] [INFO ] [Real]Absence check using 21 positive place invariants in 23 ms returned sat
[2023-03-17 08:26:57] [INFO ] [Real]Absence check using 21 positive and 24 generalized place invariants in 554 ms returned sat
[2023-03-17 08:26:57] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2023-03-17 08:26:59] [INFO ] [Real]Absence check using state equation in 1866 ms returned sat
[2023-03-17 08:26:59] [INFO ] Solution in real domain found non-integer solution.
[2023-03-17 08:27:00] [INFO ] [Nat]Absence check using 21 positive place invariants in 14 ms returned sat
[2023-03-17 08:27:00] [INFO ] [Nat]Absence check using 21 positive and 24 generalized place invariants in 42 ms returned sat
[2023-03-17 08:27:00] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2023-03-17 08:27:00] [INFO ] [Nat]Absence check using state equation in 505 ms returned sat
[2023-03-17 08:27:00] [INFO ] State equation strengthened by 111 read => feed constraints.
[2023-03-17 08:27:01] [INFO ] [Nat]Added 111 Read/Feed constraints in 396 ms returned sat
[2023-03-17 08:27:01] [INFO ] Deduced a trap composed of 49 places in 188 ms of which 5 ms to minimize.
[2023-03-17 08:27:01] [INFO ] Deduced a trap composed of 41 places in 232 ms of which 1 ms to minimize.
[2023-03-17 08:27:01] [INFO ] Trap strengthening (SAT) tested/added 3/2 trap constraints in 790 ms
[2023-03-17 08:27:02] [INFO ] Computed and/alt/rep : 20/30/20 causal constraints (skipped 612 transitions) in 242 ms.
[2023-03-17 08:27:02] [INFO ] Added : 1 causal constraints over 1 iterations in 458 ms. Result :sat
Attempting to minimize the solution found.
Minimization took 11 ms.
Parikh directed walk for 25500 steps, including 1000 resets, run took 434 ms. (steps per millisecond=58 )
Random directed walk for 500002 steps, including 0 resets, run took 2726 ms (no deadlock found). (steps per millisecond=183 )
Random walk for 500000 steps, including 0 resets, run took 3232 ms (no deadlock found). (steps per millisecond=154 )
Random directed walk for 500005 steps, including 0 resets, run took 2625 ms (no deadlock found). (steps per millisecond=190 )
Random walk for 500000 steps, including 0 resets, run took 3305 ms (no deadlock found). (steps per millisecond=151 )
Starting structural reductions in DEADLOCK mode, iteration 0 : 306/306 places, 1531/1531 transitions.
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Applied a total of 0 rules in 109 ms. Remains 306 /306 variables (removed 0) and now considering 1531/1531 (removed 0) transitions.
[2023-03-17 08:27:14] [INFO ] Flow matrix only has 642 transitions (discarded 889 similar events)
[2023-03-17 08:27:14] [INFO ] Invariant cache hit.
[2023-03-17 08:27:14] [INFO ] Implicit Places using invariants in 99 ms returned []
[2023-03-17 08:27:14] [INFO ] Flow matrix only has 642 transitions (discarded 889 similar events)
[2023-03-17 08:27:14] [INFO ] Invariant cache hit.
[2023-03-17 08:27:15] [INFO ] State equation strengthened by 111 read => feed constraints.
[2023-03-17 08:27:15] [INFO ] Implicit Places using invariants and state equation in 355 ms returned []
Implicit Place search using SMT with State Equation took 462 ms to find 0 implicit places.
[2023-03-17 08:27:15] [INFO ] Redundant transitions in 43 ms returned []
[2023-03-17 08:27:15] [INFO ] Flow matrix only has 642 transitions (discarded 889 similar events)
[2023-03-17 08:27:15] [INFO ] Invariant cache hit.
[2023-03-17 08:27:16] [INFO ] Dead Transitions using invariants and state equation in 1479 ms found 0 transitions.
Finished structural reductions in DEADLOCK mode , in 1 iterations and 2103 ms. Remains : 306/306 places, 1531/1531 transitions.
Random walk for 1250000 steps, including 0 resets, run took 7990 ms (no deadlock found). (steps per millisecond=156 )
Random directed walk for 1250000 steps, including 0 resets, run took 6292 ms (no deadlock found). (steps per millisecond=198 )
[2023-03-17 08:27:31] [INFO ] Flow matrix only has 642 transitions (discarded 889 similar events)
[2023-03-17 08:27:31] [INFO ] Invariant cache hit.
[2023-03-17 08:27:31] [INFO ] [Real]Absence check using 21 positive place invariants in 15 ms returned sat
[2023-03-17 08:27:31] [INFO ] [Real]Absence check using 21 positive and 24 generalized place invariants in 385 ms returned sat
[2023-03-17 08:27:31] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2023-03-17 08:27:33] [INFO ] [Real]Absence check using state equation in 1685 ms returned sat
[2023-03-17 08:27:33] [INFO ] Solution in real domain found non-integer solution.
[2023-03-17 08:27:33] [INFO ] [Nat]Absence check using 21 positive place invariants in 12 ms returned sat
[2023-03-17 08:27:33] [INFO ] [Nat]Absence check using 21 positive and 24 generalized place invariants in 40 ms returned sat
[2023-03-17 08:27:33] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2023-03-17 08:27:34] [INFO ] [Nat]Absence check using state equation in 640 ms returned sat
[2023-03-17 08:27:34] [INFO ] State equation strengthened by 111 read => feed constraints.
[2023-03-17 08:27:34] [INFO ] [Nat]Added 111 Read/Feed constraints in 387 ms returned sat
[2023-03-17 08:27:35] [INFO ] Deduced a trap composed of 49 places in 179 ms of which 3 ms to minimize.
[2023-03-17 08:27:35] [INFO ] Deduced a trap composed of 41 places in 190 ms of which 2 ms to minimize.
[2023-03-17 08:27:35] [INFO ] Trap strengthening (SAT) tested/added 3/2 trap constraints in 749 ms
[2023-03-17 08:27:35] [INFO ] Computed and/alt/rep : 20/30/20 causal constraints (skipped 612 transitions) in 78 ms.
[2023-03-17 08:27:35] [INFO ] Added : 1 causal constraints over 1 iterations in 199 ms. Result :sat
Attempting to minimize the solution found.
Minimization took 10 ms.
Parikh directed walk for 25500 steps, including 1000 resets, run took 210 ms. (steps per millisecond=121 )
Random directed walk for 500000 steps, including 0 resets, run took 2408 ms (no deadlock found). (steps per millisecond=207 )
Random walk for 500000 steps, including 0 resets, run took 3304 ms (no deadlock found). (steps per millisecond=151 )
Random directed walk for 500001 steps, including 0 resets, run took 2289 ms (no deadlock found). (steps per millisecond=218 )
Random walk for 500000 steps, including 0 resets, run took 3066 ms (no deadlock found). (steps per millisecond=163 )
[2023-03-17 08:27:47] [INFO ] Flatten gal took : 390 ms
[2023-03-17 08:27:47] [INFO ] Unfolded HLPN to a Petri net with 326 places and 1651 transitions 11294 arcs in 18 ms.
[2023-03-17 08:27:47] [INFO ] Unfolded 14 HLPN properties in 0 ms.
Initial state reduction rules removed 1 formulas.
[2023-03-17 08:27:47] [INFO ] Reduced 80 identical enabling conditions.
Deduced a syphon composed of 10 places in 2 ms
Reduce places removed 20 places and 20 transitions.
Finished random walk after 39 steps, including 0 resets, run visited all 13 properties in 34 ms. (steps per millisecond=1 )
Able to resolve query QuasiLiveness after proving 14 properties.
Deduced a syphon composed of 10 places in 2 ms
Reduce places removed 20 places and 20 transitions.
Unable to solve all queries for examination Liveness. Remains :14 assertions to prove.
No /home/mcc/execution/Liveness.xml examination file found. Proceeding without properties.
Parsed 14 properties from file /home/mcc/execution/Liveness.xml in 1 ms.
Working with output stream class java.io.PrintStream
Total runtime 71921 ms.
starting LoLA
BK_INPUT SafeBus-COL-10
BK_EXAMINATION: Liveness
bin directory: /home/mcc/BenchKit/bin//../reducer/bin//../../lola/bin/
current directory: /home/mcc/execution
GlobalProperty: Liveness
TIME LIMIT: Killed by timeout after 1800 seconds
MemTotal: 16393216 kB
MemFree: 2784904 kB
After kill :
MemTotal: 16393216 kB
MemFree: 16157840 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 Liveness -timeout 180 -rebuildPNML
lola: MEM LIMIT 32
lola: MEM LIMIT 5
lola: NET
lola: input: PNML file (--pnmlnet)
lola: reading net from /home/mcc/execution/model.pnml
lola: reading pnml
lola: PNML file contains High-Level net
lola: finished parsing
lola: closed net file /home/mcc/execution/model.pnml
lola: TR BINDINGS
lola: TR BINDINGS DONE
lola: Places: 326, Transitions: 1651
lola: @ trans C_free
lola: @ trans C_refuse
lola: @ trans loss_m
lola: @ trans loss_a
lola: @ trans I_ask1
lola: @ trans I_rec1
lola: @ trans I_reemit
lola: @ trans I_emit
lola: @ trans I_refused
lola: @ trans C_provide
lola: @ trans I_ask2
lola: @ trans I_rec2
lola: @ trans I_free
lola: @ trans Gto
lola: LAUNCH SYMM
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lola: caught signal Terminated - aborting LoLA
FINAL RESULTS
FINISHED FORMULA: CATEGORY VALUE PRODUCED BY
Time elapsed: 1724 secs. Pages in use: 16
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="SafeBus-COL-10"
export BK_EXAMINATION="Liveness"
export BK_TOOL="lolaxred"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="1800"
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 lolaxred"
echo " Input is SafeBus-COL-10, examination is Liveness"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r373-smll-167891824400139"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"
tar xzf /home/mcc/BenchKit/INPUTS/SafeBus-COL-10.tgz
mv SafeBus-COL-10 execution
cd execution
if [ "Liveness" = "ReachabilityDeadlock" ] || [ "Liveness" = "UpperBounds" ] || [ "Liveness" = "QuasiLiveness" ] || [ "Liveness" = "StableMarking" ] || [ "Liveness" = "Liveness" ] || [ "Liveness" = "OneSafe" ] || [ "Liveness" = "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 [ "Liveness" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "Liveness" != "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 "Liveness.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property Liveness.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "Liveness.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 '
echo "FORMULA_NAME $x"
done
elif [ "Liveness" = "ReachabilityDeadlock" ] || [ "Liveness" = "QuasiLiveness" ] || [ "Liveness" = "StableMarking" ] || [ "Liveness" = "Liveness" ] || [ "Liveness" = "OneSafe" ] ; then
echo "FORMULA_NAME Liveness"
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 ;