Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2020-input.r166-smll-158987787500287.qcow2', fmt=qcow2 size=4294967296 backing_file='/data/fkordon/mcc2020-input.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off
Waiting for the VM to be ready (probing ssh)
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=====================================================================
Generated by BenchKit 2-4028
Executing tool itslola
Input is AirplaneLD-PT-0500, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r166-smll-158987787500287
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 7.3M
-rw-r--r-- 1 mcc users 104K Mar 24 10:48 CTLCardinality.txt
-rw-r--r-- 1 mcc users 241K Mar 24 10:48 CTLCardinality.xml
-rw-r--r-- 1 mcc users 69K Mar 24 09:29 CTLFireability.txt
-rw-r--r-- 1 mcc users 279K Mar 24 09:29 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.0K Mar 24 05:37 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.2K Mar 24 05:37 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 116K Apr 8 14:40 LTLCardinality.txt
-rw-r--r-- 1 mcc users 325K Apr 29 06:16 LTLCardinality.xml
-rw-r--r-- 1 mcc users 128K Apr 8 14:40 LTLFireability.txt
-rw-r--r-- 1 mcc users 515K Apr 29 06:16 LTLFireability.xml
-rw-r--r-- 1 mcc users 182K Mar 24 08:00 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 442K Mar 24 08:00 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 177K Mar 24 06:22 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 720K Mar 24 06:22 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 29K Mar 24 08:44 UpperBounds.txt
-rw-r--r-- 1 mcc users 50K Mar 24 08:44 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 Mar 24 05:37 equiv_col
-rw-r--r-- 1 mcc users 5 Mar 24 05:37 instance
-rw-r--r-- 1 mcc users 6 Mar 24 05:37 iscolored
-rw-r--r-- 1 mcc users 3.9M Mar 24 05:37 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 AirplaneLD-PT-0500-ReachabilityFireability-00
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-01
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-02
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-03
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-04
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-05
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-06
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-07
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-08
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-09
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-10
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-11
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-12
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-13
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-14
FORMULA_NAME AirplaneLD-PT-0500-ReachabilityFireability-15

=== Now, execution of the tool begins

BK_START 1591391119310

bash -c /home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n "BK_STOP " ; date -u +%s%3N
[2020-06-05 21:05:22] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -z3path, /home/mcc/BenchKit//z3/bin/z3, -yices2path, /home/mcc/BenchKit//yices/bin/yices, -timeout, 3600, -rebuildPNML]
[2020-06-05 21:05:22] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2020-06-05 21:05:22] [INFO ] Load time of PNML (sax parser for PT used): 548 ms
[2020-06-05 21:05:23] [INFO ] Transformed 3519 places.
[2020-06-05 21:05:23] [INFO ] Transformed 4008 transitions.
[2020-06-05 21:05:23] [INFO ] Found NUPN structural information;
[2020-06-05 21:05:23] [INFO ] Parsed PT model containing 3519 places and 4008 transitions in 654 ms.
Reduce places removed 1502 places and 0 transitions.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 219 ms.
Working with output stream class java.io.PrintStream
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-12 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Incomplete random walk after 10000 steps, including 1264 resets, run finished after 1425 ms. (steps per millisecond=7 ) properties seen :[0, 0, 1, 1, 1, 0, 1, 1, 0, 0, 0, 1, 0, 0, 0]
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-11 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-07 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-06 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-04 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-03 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-02 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 800 ms. (steps per millisecond=12 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 166 ms. (steps per millisecond=60 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 1045 ms. (steps per millisecond=9 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=1111 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 10 ms. (steps per millisecond=1000 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=1111 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 7 ms. (steps per millisecond=1428 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 5 ms. (steps per millisecond=2000 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0]
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=1111 ) properties seen :[0, 0, 0, 0, 0, 0, 0, 0, 0]
// Phase 1: matrix 4008 rows 2017 cols
[2020-06-05 21:05:27] [INFO ] Computed 3 place invariants in 653 ms
[2020-06-05 21:05:28] [INFO ] [Real]Absence check using 2 positive place invariants in 82 ms returned sat
[2020-06-05 21:05:28] [INFO ] [Real]Absence check using 2 positive and 1 generalized place invariants in 60 ms returned sat
[2020-06-05 21:05:28] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-06-05 21:05:32] [INFO ] [Real]Absence check using state equation in 4079 ms returned (error "Solver has unexpectedly terminated")
[2020-06-05 21:05:33] [INFO ] [Real]Absence check using 2 positive place invariants in 57 ms returned sat
[2020-06-05 21:05:33] [INFO ] [Real]Absence check using 2 positive and 1 generalized place invariants in 48 ms returned sat
[2020-06-05 21:05:33] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-06-05 21:05:37] [INFO ] SMT solver returned unknown. Retrying;
[2020-06-05 21:05:37] [INFO ] [Real]Absence check using state equation in 4341 ms returned (error "Failed to check-sat")
[2020-06-05 21:05:38] [INFO ] [Real]Absence check using 2 positive place invariants in 125 ms returned sat
[2020-06-05 21:05:38] [INFO ] [Real]Absence check using 2 positive and 1 generalized place invariants in 110 ms returned sat
[2020-06-05 21:05:38] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-06-05 21:05:42] [INFO ] [Real]Absence check using state equation in 4221 ms returned (error "Failed to check-sat")
[2020-06-05 21:05:43] [INFO ] [Real]Absence check using 2 positive place invariants in 73 ms returned sat
[2020-06-05 21:05:43] [INFO ] [Real]Absence check using 2 positive and 1 generalized place invariants in 62 ms returned sat
[2020-06-05 21:05:43] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-06-05 21:05:47] [INFO ] SMT solver returned unknown. Retrying;
[2020-06-05 21:05:47] [INFO ] [Real]Absence check using state equation in 4405 ms returned (error "Failed to check-sat")
[2020-06-05 21:05:48] [INFO ] [Real]Absence check using 2 positive place invariants in 50 ms returned sat
[2020-06-05 21:05:48] [INFO ] [Real]Absence check using 2 positive and 1 generalized place invariants in 70 ms returned sat
[2020-06-05 21:05:48] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-06-05 21:05:52] [INFO ] SMT solver returned unknown. Retrying;
[2020-06-05 21:05:52] [INFO ] [Real]Absence check using state equation in 4344 ms returned (error "Failed to check-sat")
[2020-06-05 21:05:53] [INFO ] [Real]Absence check using 2 positive place invariants in 51 ms returned sat
[2020-06-05 21:05:53] [INFO ] [Real]Absence check using 2 positive and 1 generalized place invariants in 42 ms returned sat
[2020-06-05 21:05:53] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-06-05 21:05:57] [INFO ] SMT solver returned unknown. Retrying;
[2020-06-05 21:05:57] [INFO ] [Real]Absence check using state equation in 4414 ms returned (error "Failed to check-sat")
[2020-06-05 21:05:58] [INFO ] [Real]Absence check using 2 positive place invariants in 84 ms returned sat
[2020-06-05 21:05:58] [INFO ] [Real]Absence check using 2 positive and 1 generalized place invariants in 42 ms returned sat
[2020-06-05 21:05:58] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-06-05 21:06:02] [WARNING] SMT solver failed with error :java.lang.RuntimeException: SMT solver raised an error when submitting script. Raised (error "Failed to assert expression: java.io.IOException: Broken pipe (= s566 (- t2564 t560))") while checking expression at index 6
[2020-06-05 21:06:03] [INFO ] [Real]Absence check using 2 positive place invariants in 85 ms returned sat
[2020-06-05 21:06:03] [INFO ] [Real]Absence check using 2 positive and 1 generalized place invariants in 70 ms returned sat
[2020-06-05 21:06:03] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-06-05 21:06:07] [INFO ] SMT solver returned unknown. Retrying;
[2020-06-05 21:06:07] [INFO ] [Real]Absence check using state equation in 4303 ms returned (error "Failed to check-sat")
[2020-06-05 21:06:08] [INFO ] [Real]Absence check using 2 positive place invariants in 58 ms returned sat
[2020-06-05 21:06:08] [INFO ] [Real]Absence check using 2 positive and 1 generalized place invariants in 48 ms returned sat
[2020-06-05 21:06:08] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-06-05 21:06:12] [INFO ] SMT solver returned unknown. Retrying;
[2020-06-05 21:06:12] [INFO ] [Real]Absence check using state equation in 4488 ms returned (error "Failed to check-sat")
Support contains 1515 out of 2017 places. Attempting structural reductions.
Starting structural reductions, iteration 0 : 2017/2017 places, 4008/4008 transitions.
Discarding 4 places :
Also discarding 0 output transitions
Graph (complete) has 5273 edges and 2017 vertex of which 2013 are kept as prefixes of interest. Removing 4 places using SCC suffix rule.46 ms
Drop transitions removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Iterating post reduction 0 with 1 rules applied. Total rules applied 2 place count 2013 transition count 4007
Symmetric choice reduction at 1 with 493 rule applications. Total rules 495 place count 2013 transition count 4007
Deduced a syphon composed of 493 places in 3 ms
Reduce places removed 493 places and 493 transitions.
Iterating global reduction 1 with 986 rules applied. Total rules applied 1481 place count 1520 transition count 3514
Ensure Unique test removed 493 transitions
Reduce isomorphic transitions removed 493 transitions.
Iterating post reduction 1 with 493 rules applied. Total rules applied 1974 place count 1520 transition count 3021
Applied a total of 1974 rules in 253 ms. Remains 1520 /2017 variables (removed 497) and now considering 3021/4008 (removed 987) transitions.
Finished structural reductions, in 1 iterations. Remains : 1520/2017 places, 3021/4008 transitions.
Interrupted random walk after 304357 steps, including 40902 resets, run timeout after 30001 ms. (steps per millisecond=10 ) properties seen :[0, 0, 0, 1, 1, 1, 1, 1, 1]
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-15 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-14 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-13 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-10 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-09 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-08 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Interrupted Best-First random walk after 86708 steps, including 33 resets, run timeout after 5008 ms. (steps per millisecond=17 ) properties seen :[0, 0, 0]
Interrupted Best-First random walk after 282524 steps, including 109 resets, run timeout after 5008 ms. (steps per millisecond=56 ) properties seen :[0, 0, 0]
Interrupted Best-First random walk after 49680 steps, including 23 resets, run timeout after 5033 ms. (steps per millisecond=9 ) properties seen :[0, 0, 0]
// Phase 1: matrix 3021 rows 1520 cols
[2020-06-05 21:06:58] [INFO ] Computed 1 place invariants in 276 ms
[2020-06-05 21:06:58] [INFO ] [Real]Absence check using 0 positive and 1 generalized place invariants in 52 ms returned sat
[2020-06-05 21:06:58] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-06-05 21:07:07] [INFO ] [Real]Absence check using state equation in 9265 ms returned unsat
[2020-06-05 21:07:08] [INFO ] [Real]Absence check using 0 positive and 1 generalized place invariants in 41 ms returned sat
[2020-06-05 21:07:08] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-06-05 21:07:17] [INFO ] [Real]Absence check using state equation in 9599 ms returned unsat
[2020-06-05 21:07:18] [INFO ] [Real]Absence check using 0 positive and 1 generalized place invariants in 60 ms returned sat
[2020-06-05 21:07:18] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-06-05 21:07:34] [INFO ] SMT solver returned unknown. Retrying;
[2020-06-05 21:07:37] [INFO ] [Real]Absence check using state equation in 19661 ms returned unknown
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-01 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-00 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
Support contains 1004 out of 1520 places. Attempting structural reductions.
Starting structural reductions, iteration 0 : 1520/1520 places, 3021/3021 transitions.
Discarding 511 places :
Also discarding 1014 output transitions
Drop transitions removed 1014 transitions
Graph (complete) has 2021 edges and 1520 vertex of which 1009 are kept as prefixes of interest. Removing 511 places using SCC suffix rule.6 ms
Drop transitions removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Iterating post reduction 0 with 1 rules applied. Total rules applied 2 place count 1009 transition count 2006
Performed 1 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 1 with 1 Pre rules applied. Total rules applied 2 place count 1009 transition count 2005
Deduced a syphon composed of 1 places in 1 ms
Ensure Unique test removed 1 places
Reduce places removed 2 places and 0 transitions.
Iterating global reduction 1 with 3 rules applied. Total rules applied 5 place count 1007 transition count 2005
Free-agglomeration rule applied 1 times.
Iterating global reduction 1 with 1 rules applied. Total rules applied 6 place count 1007 transition count 2004
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 1 with 1 rules applied. Total rules applied 7 place count 1006 transition count 2004
Applied a total of 7 rules in 66 ms. Remains 1006 /1520 variables (removed 514) and now considering 2004/3021 (removed 1017) transitions.
Finished structural reductions, in 1 iterations. Remains : 1006/1520 places, 2004/3021 transitions.
Interrupted random walk after 764579 steps, including 152915 resets, run timeout after 30001 ms. (steps per millisecond=25 ) properties seen :[0]
Interrupted Best-First random walk after 57567 steps, including 56 resets, run timeout after 5041 ms. (steps per millisecond=11 ) properties seen :[0]
Probably explored full state space saw : 6007 states, properties seen :[0]
Probabilistic random walk after 19013 steps, saw 6007 distinct states, run finished after 419 ms. (steps per millisecond=45 ) properties seen :[0]
Explored full state space saw : 6007 states, properties seen :[0]
Exhaustive walk after 19013 steps, saw 6007 distinct states, run finished after 384 ms. (steps per millisecond=49 ) properties seen :[0]
FORMULA AirplaneLD-PT-0500-ReachabilityFireability-05 TRUE TECHNIQUES TOPOLOGICAL EXHAUSTIVE_WALK
All properties solved without resorting to model-checking.

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

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="AirplaneLD-PT-0500"
export BK_EXAMINATION="ReachabilityFireability"
export BK_TOOL="itslola"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="3600"
export BK_MEMORY_CONFINEMENT="16384"

# 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 2-4028"
echo " Executing tool itslola"
echo " Input is AirplaneLD-PT-0500, examination is ReachabilityFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r166-smll-158987787500287"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/AirplaneLD-PT-0500.tgz
mv AirplaneLD-PT-0500 execution
cd execution
if [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "UpperBounds" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] || [ "ReachabilityFireability" = "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 [ "ReachabilityFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityFireability" != "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 "ReachabilityFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property ReachabilityFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "ReachabilityFireability.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 '' ReachabilityFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityFireability"
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 ;