fond
Model Checking Contest 2023
13th edition, Paris, France, April 26, 2023 (at TOOLympics II)
Execution of r133-smll-167819411400575
Last Updated
May 14, 2023

About the Execution of ITS-Tools for DrinkVendingMachine-COL-02

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
198.140 6224.00 10268.00 521.60 FTFTFFTFFFFTFFTT normal

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.r133-smll-167819411400575.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 itstools
Input is DrinkVendingMachine-COL-02, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r133-smll-167819411400575
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 416K
-rw-r--r-- 1 mcc users 7.8K Feb 26 04:36 CTLCardinality.txt
-rw-r--r-- 1 mcc users 73K Feb 26 04:36 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.7K Feb 26 04:33 CTLFireability.txt
-rw-r--r-- 1 mcc users 44K Feb 26 04:33 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:40 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.5K Jan 29 11:40 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 4.1K Feb 25 16:02 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K Feb 25 16:02 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.5K Feb 25 16:02 LTLFireability.txt
-rw-r--r-- 1 mcc users 16K Feb 25 16:02 LTLFireability.xml
-rw-r--r-- 1 mcc users 8.8K Feb 26 04:39 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 76K Feb 26 04:39 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.6K Feb 26 04:38 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 63K Feb 26 04:38 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.9K Feb 25 16:02 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.9K Feb 25 16:02 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 Mar 5 18:22 equiv_pt
-rw-r--r-- 1 mcc users 3 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 5 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 22K Mar 5 18:22 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 DrinkVendingMachine-COL-02-ReachabilityFireability-00
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-01
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-02
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-03
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-04
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-05
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-06
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-07
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-08
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-09
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-10
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-11
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-12
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-13
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-14
FORMULA_NAME DrinkVendingMachine-COL-02-ReachabilityFireability-15

=== Now, execution of the tool begins

BK_START 1678621791827

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=itstools
BK_EXAMINATION=ReachabilityFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=DrinkVendingMachine-COL-02
Not applying reductions.
Model is COL
ReachabilityFireability COL
Running Version 202303021504
[2023-03-12 11:49:54] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2023-03-12 11:49:54] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-12 11:49:54] [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.
[2023-03-12 11:49:55] [WARNING] Using fallBack plugin, rng conformance not checked
[2023-03-12 11:49:55] [INFO ] Load time of PNML (colored model parsed with PNMLFW) : 818 ms
[2023-03-12 11:49:55] [INFO ] Imported 6 HL places and 7 HL transitions for a total of 24 PT places and 252.0 transition bindings in 24 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 24 ms.
Working with output stream class java.io.PrintStream
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-02 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-04 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-13 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2023-03-12 11:49:55] [INFO ] Built PT skeleton of HLPN with 6 places and 7 transitions 28 arcs in 6 ms.
[2023-03-12 11:49:55] [INFO ] Skeletonized 13 HLPN properties in 9 ms.
Remains 1 properties that can be checked using skeleton over-approximation.
Computed a total of 0 stabilizing places and 0 stable transitions
Finished random walk after 1 steps, including 0 resets, run visited all 1 properties in 9 ms. (steps per millisecond=0 )
[2023-03-12 11:49:56] [INFO ] Flatten gal took : 19 ms
[2023-03-12 11:49:56] [INFO ] Flatten gal took : 3 ms
Symmetric sort wr.t. initial and guards and successors and join/free detected :Quality
Symmetric sort wr.t. initial detected :Quality
Transition elaborate3 : guard parameter $x(Quality:8) in guard (AND (GT $x 5) (LEQ $x 7))introduces in Quality(8) partition with 2 elements
Transition elaborate2 : guard parameter $x(Quality:8) in guard (AND (GT $x 3) (LEQ $x 5))introduces in Quality(8) partition with 2 elements
Transition elaborate1 : guard parameter $x(Quality:8) in guard (AND (GT $x 1) (LEQ $x 3))introduces in Quality(8) partition with 2 elements
Transition elaborate0 : guard parameter $x(Quality:8) in guard (LEQ $x 1)introduces in Quality(8) partition with 2 elements
Sort wr.t. initial and guards Quality has partition 4
Applying symmetric unfolding of partitioned symmetric sort :Quality domain size was 8 reducing to 4 values.
For transition elaborate3:(AND (GT $x 5) (LEQ $x 7)) -> (EQ $x 3)
For transition elaborate2:(AND (GT $x 3) (LEQ $x 5)) -> (EQ $x 2)
For transition elaborate1:(AND (GT $x 1) (LEQ $x 3)) -> (EQ $x 1)
For transition elaborate0:(LEQ $x 1) -> (EQ $x 0)
Symmetric sort wr.t. initial and guards and successors and join/free detected :Options
Symmetric sort wr.t. initial detected :Options
Symmetric sort wr.t. initial and guards detected :Options
Applying symmetric unfolding of full symmetric sort :Options domain size was 2
Symmetric sort wr.t. initial and guards and successors and join/free detected :Products
Symmetric sort wr.t. initial detected :Products
Symmetric sort wr.t. initial and guards detected :Products
Applying symmetric unfolding of full symmetric sort :Products domain size was 2
[2023-03-12 11:49:56] [INFO ] Unfolded HLPN to a Petri net with 12 places and 10 transitions 34 arcs in 16 ms.
[2023-03-12 11:49:56] [INFO ] Unfolded 13 HLPN properties in 0 ms.
Initial state reduction rules removed 7 formulas.
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-01 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-03 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-08 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-10 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-11 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-14 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-15 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2023-03-12 11:49:56] [INFO ] Flatten gal took : 6 ms
[2023-03-12 11:49:56] [INFO ] Flatten gal took : 12 ms
[2023-03-12 11:49:56] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality10060065527870545944.gal : 8 ms
[2023-03-12 11:49:56] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality16309138631746807371.prop : 5 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202303021504/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality10060065527870545944.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality16309138631746807371.prop' '--nowitness' '--gen-order' 'FOLLOW'

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202303021504/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...330
Loading property file /tmp/ReachabilityCardinality16309138631746807371.prop.
Invariant property DrinkVendingMachine-COL-02-ReachabilityFireability-12 does not hold.
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-12 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
Invariant property DrinkVendingMachine-COL-02-ReachabilityFireability-07 does not hold.
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-07 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
Invariant property DrinkVendingMachine-COL-02-ReachabilityFireability-00 does not hold.
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-00 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
SDD proceeding with computation,3 properties remain. new max is 2
SDD size :1 after 6
SDD proceeding with computation,3 properties remain. new max is 4
SDD size :6 after 8
SDD proceeding with computation,3 properties remain. new max is 8
SDD size :8 after 48
SDD proceeding with computation,3 properties remain. new max is 16
SDD size :48 after 162
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,243,0.032816,3676,2,23,12,336,9,0,89,211,0
Total reachable state count : 243

Verifying 6 reachability properties.
Invariant property DrinkVendingMachine-COL-02-ReachabilityFireability-00 does not hold.

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
DrinkVendingMachine-COL-02-ReachabilityFireability-00,81,0.033834,3676,2,21,12,336,10,0,93,211,0
Reachability property DrinkVendingMachine-COL-02-ReachabilityFireability-05 does not hold.
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-05 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
No reachable states exhibit your property : DrinkVendingMachine-COL-02-ReachabilityFireability-05

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
DrinkVendingMachine-COL-02-ReachabilityFireability-05,0,0.035915,3988,1,0,12,336,10,0,100,211,0
Invariant property DrinkVendingMachine-COL-02-ReachabilityFireability-06 is true.
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-06 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
DrinkVendingMachine-COL-02-ReachabilityFireability-06,0,0.037557,3988,1,0,12,336,10,0,102,211,0
Invariant property DrinkVendingMachine-COL-02-ReachabilityFireability-07 does not hold.

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
DrinkVendingMachine-COL-02-ReachabilityFireability-07,27,0.038028,3988,2,19,12,336,11,0,102,211,0
Reachability property DrinkVendingMachine-COL-02-ReachabilityFireability-09 does not hold.
FORMULA DrinkVendingMachine-COL-02-ReachabilityFireability-09 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL COLLATERAL_PROCESSING
No reachable states exhibit your property : DrinkVendingMachine-COL-02-ReachabilityFireability-09

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
DrinkVendingMachine-COL-02-ReachabilityFireability-09,0,0.038578,3988,1,0,12,336,11,0,104,211,0
Invariant property DrinkVendingMachine-COL-02-ReachabilityFireability-12 does not hold.

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
DrinkVendingMachine-COL-02-ReachabilityFireability-12,9,0.03926,3988,2,17,12,336,12,0,105,211,0
Incomplete random walk after 10000 steps, including 2 resets, run finished after 369 ms. (steps per millisecond=27 ) properties (out of 6) seen :3
Incomplete Best-First random walk after 10000 steps, including 2 resets, run finished after 95 ms. (steps per millisecond=105 ) properties (out of 3) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 82 ms. (steps per millisecond=121 ) properties (out of 3) seen :0
Incomplete Best-First random walk after 10000 steps, including 2 resets, run finished after 64 ms. (steps per millisecond=156 ) properties (out of 3) seen :0
Running SMT prover for 3 properties.
// Phase 1: matrix 10 rows 12 cols
[2023-03-12 11:49:56] [INFO ] Computed 6 place invariants in 4 ms
[2023-03-12 11:49:56] [INFO ] [Real]Absence check using 6 positive place invariants in 7 ms returned sat
[2023-03-12 11:49:56] [INFO ] After 152ms SMT Verify possible using all constraints in real domain returned unsat :2 sat :0 real:1
[2023-03-12 11:49:56] [INFO ] [Nat]Absence check using 6 positive place invariants in 3 ms returned sat
[2023-03-12 11:49:56] [INFO ] After 37ms SMT Verify possible using all constraints in natural domain returned unsat :3 sat :0
Fused 3 Parikh solutions to 0 different solutions.
Parikh walk visited 0 properties in 0 ms.
All properties solved without resorting to model-checking.
Total runtime 2067 ms.

BK_STOP 1678621798051

--------------------
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
+ [[ ReachabilityFireability = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution ReachabilityFireability -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
+ 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//../itstools/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityFireability -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="DrinkVendingMachine-COL-02"
export BK_EXAMINATION="ReachabilityFireability"
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 2-5348"
echo " Executing tool itstools"
echo " Input is DrinkVendingMachine-COL-02, 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 r133-smll-167819411400575"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/DrinkVendingMachine-COL-02.tgz
mv DrinkVendingMachine-COL-02 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 ;