Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2019-input.r140-smll-155284912800340.qcow2', fmt=qcow2 size=4294967296 backing_file='/data/fkordon/mcc2019-input.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off
Waiting for the VM to be ready (probing ssh)
......................
=====================================================================
Generated by BenchKit 2-3817
Executing tool itstools
Input is RefineWMG-PT-010011, examination is LTLFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r140-smll-155284912800340
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 184K
-rw-r--r-- 1 mcc users 2.8K Feb 12 14:26 CTLCardinality.txt
-rw-r--r-- 1 mcc users 15K Feb 12 14:26 CTLCardinality.xml
-rw-r--r-- 1 mcc users 2.5K Feb 8 16:20 CTLFireability.txt
-rw-r--r-- 1 mcc users 17K Feb 8 16:20 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.0K Mar 10 17:31 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 5.8K Mar 10 17:31 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 107 Feb 24 15:05 GlobalProperties.txt
-rw-r--r-- 1 mcc users 345 Feb 24 15:05 GlobalProperties.xml
-rw-r--r-- 1 mcc users 2.4K Feb 5 01:06 LTLCardinality.txt
-rw-r--r-- 1 mcc users 11K Feb 5 01:06 LTLCardinality.xml
-rw-r--r-- 1 mcc users 1.9K Feb 4 22:47 LTLFireability.txt
-rw-r--r-- 1 mcc users 9.3K Feb 4 22:47 LTLFireability.xml
-rw-r--r-- 1 mcc users 3.6K Feb 4 16:36 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 19K Feb 4 16:36 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 2.4K Feb 1 12:57 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 13K Feb 1 12:57 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Feb 4 22:30 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Feb 4 22:30 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Jan 29 09:35 equiv_col
-rw-r--r-- 1 mcc users 7 Jan 29 09:35 instance
-rw-r--r-- 1 mcc users 6 Jan 29 09:35 iscolored
-rw-r--r-- 1 mcc users 24K Mar 10 17:31 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 RefineWMG-PT-010-011-LTLFireability-00
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-01
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-02
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-03
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-04
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-05
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-06
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-07
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-08
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-09
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-10
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-11
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-12
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-13
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-14
FORMULA_NAME RefineWMG-PT-010-011-LTLFireability-15

=== Now, execution of the tool begins

BK_START 1553018965672

Working with output stream class java.io.PrintStream
Using solver Z3 to compute partial order matrices.
Built C files in :
/home/mcc/execution
Invoking ITS tools like this :CommandLine [args=[/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.201903111103/bin/its-ltl-linux64, --gc-threshold, 2000000, -i, /home/mcc/execution/LTLFireability.pnml.gal, -t, CGAL, -LTL, /home/mcc/execution/LTLFireability.ltl, -c, -stutter-deadlock], workingDir=/home/mcc/execution]

its-ltl command run as :

/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.201903111103/bin/its-ltl-linux64 --gc-threshold 2000000 -i /home/mcc/execution/LTLFireability.pnml.gal -t CGAL -LTL /home/mcc/execution/LTLFireability.ltl -c -stutter-deadlock
Read 16 LTL properties
Checking formula 0 : !(((G(F(X("(((p33>=1)&&(p34>=1))&&(p36>=1))"))))U(F(F(F("(p29>=1)"))))))
Formula 0 simplified : !(GFX"(((p33>=1)&&(p34>=1))&&(p36>=1))" U F"(p29>=1)")
Presburger conditions satisfied. Using coverability to approximate state space in K-Induction.
// Phase 1: matrix 43 rows 54 cols
invariant :p12 + p13 = 11
invariant :p2 + p3 = 11
invariant :p39 + p40 = 11
invariant :p19 + p20 = 11
invariant :p44 + p45 = 11
invariant :p29 + p30 = 11
invariant :p22 + p23 = 11
invariant :p37 + p38 = 11
invariant :p42 + p43 = 11
invariant :psecond + pterce = 5
invariant :p14 + p15 = 11
invariant :p24 + p25 = 11
invariant :p7 + p8 = 11
invariant :p + pprime + p1 + p6 + p11 + p16 + p21 + p26 + p31 + p36 = 7
invariant :p27 + p28 = 11
invariant :p4 + p5 = 11
invariant :p17 + p18 = 11
invariant :p32 + p33 = 11
invariant :p34 + p35 = 11
invariant :p47 + p48 = 11
invariant :p49 + p50 = 11
invariant :p9 + p10 = 11
Running compilation step : CommandLine [args=[gcc, -c, -I/home/mcc/BenchKit//lts_install_dir//include, -I., -std=c99, -fPIC, -O2, model.c], workingDir=/home/mcc/execution]
Compilation finished in 1216 ms.
Running link step : CommandLine [args=[gcc, -shared, -o, gal.so, model.o], workingDir=/home/mcc/execution]
Link finished in 49 ms.
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, --when, --ltl, ([](<>(X((LTLAP0==true)))))U(<>(<>(<>((LTLAP1==true))))), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 320 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-00 TRUE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, --when, --ltl, <>(X(<>(<>(<>((LTLAP2==true)))))), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 179 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-01 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, --when, --ltl, (((LTLAP3==true))U([]((LTLAP3==true))))U(X((LTLAP4==true))), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 436 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-02 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, --when, --ltl, <>(<>(X((LTLAP5==true)))), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 547 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-03 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, -p, --pins-guards, --when, --ltl, [](((LTLAP0==true))U(((LTLAP6==true))U((LTLAP5==true)))), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 48 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-04 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, -p, --pins-guards, --when, --ltl, []((<>(<>((LTLAP5==true))))U(((LTLAP7==true))U((LTLAP8==true)))), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 196 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-05 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, -p, --pins-guards, --when, --ltl, (LTLAP9==true), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 493 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-06 TRUE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, --when, --ltl, [](X(((LTLAP10==true))U((LTLAP11==true)))), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 256 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-07 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, --when, --ltl, <>(([](X((LTLAP12==true))))U(X([]((LTLAP13==true))))), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 50 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-08 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, --when, --ltl, <>(([]([]((LTLAP14==true))))U([](X((LTLAP11==true))))), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 304 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-09 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, -p, --pins-guards, --when, --ltl, (LTLAP12==true), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 41 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-10 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, -p, --pins-guards, --when, --ltl, (LTLAP15==true), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 44 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-11 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, -p, --pins-guards, --when, --ltl, []([](([]((LTLAP16==true)))U(<>((LTLAP7==true))))), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 43 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-12 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, -p, --pins-guards, --when, --ltl, (LTLAP3==true), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 238 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-13 TRUE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, -p, --pins-guards, --when, --ltl, ((LTLAP17==true))U(<>((LTLAP18==true))), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 389 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-14 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
Running LTSmin : CommandLine [args=[/home/mcc/BenchKit//lts_install_dir//bin/pins2lts-mc, ./gal.so, --threads=8, --when, --ltl, X(X((LTLAP8==true))), --buchi-type=spotba], workingDir=/home/mcc/execution]
LTSmin run took 154 ms.
FORMULA RefineWMG-PT-010-011-LTLFireability-15 FALSE TECHNIQUES PARTIAL_ORDER EXPLICIT LTSMIN SAT_SMT
ITS tools runner thread asked to quit. Dying gracefully.

BK_STOP 1553018978720

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

+ export BINDIR=/home/mcc/BenchKit/
+ BINDIR=/home/mcc/BenchKit/
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ LTLFireability = StateSpace ]]
+ /home/mcc/BenchKit//runeclipse.sh /home/mcc/execution LTLFireability -its -ltsminpath /home/mcc/BenchKit//lts_install_dir/ -smt
+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
+ /home/mcc/BenchKit//itstools/its-tools -data /home/mcc/execution/workspace -pnfolder /home/mcc/execution -examination LTLFireability -z3path /home/mcc/BenchKit//z3/bin/z3 -yices2path /home/mcc/BenchKit//yices/bin/yices -its -ltsminpath /home/mcc/BenchKit//lts_install_dir/ -smt -vmargs -Dosgi.locking=none -Declipse.stateSaveDelayInterval=-1 -Dosgi.configuration.area=/tmp/.eclipse -Xss8m -Xms40m -Xmx8192m -Dfile.encoding=UTF-8 -Dosgi.requiredJavaVersion=1.6
Mar 19, 2019 6:09:28 PM fr.lip6.move.gal.application.Application start
INFO: Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, LTLFireability, -z3path, /home/mcc/BenchKit//z3/bin/z3, -yices2path, /home/mcc/BenchKit//yices/bin/yices, -its, -ltsminpath, /home/mcc/BenchKit//lts_install_dir/, -smt]
Mar 19, 2019 6:09:28 PM fr.lip6.move.gal.application.MccTranslator transformPNML
INFO: Parsing pnml file : /home/mcc/execution/model.pnml
Mar 19, 2019 6:09:28 PM fr.lip6.move.gal.nupn.PTNetReader loadFromXML
INFO: Load time of PNML (sax parser for PT used): 47 ms
Mar 19, 2019 6:09:28 PM fr.lip6.move.gal.pnml.togal.PTGALTransformer handlePage
INFO: Transformed 54 places.
Mar 19, 2019 6:09:29 PM fr.lip6.move.gal.pnml.togal.PTGALTransformer handlePage
INFO: Transformed 43 transitions.
Mar 19, 2019 6:09:29 PM fr.lip6.move.serialization.SerializationUtil systemToFile
INFO: Time to serialize gal into /home/mcc/execution/model.pnml.img.gal : 10 ms
Mar 19, 2019 6:09:29 PM fr.lip6.move.gal.instantiate.GALRewriter flatten
INFO: Flatten gal took : 48 ms
Mar 19, 2019 6:09:29 PM fr.lip6.move.serialization.SerializationUtil systemToFile
INFO: Time to serialize gal into /home/mcc/execution/LTLFireability.pnml.gal : 3 ms
Mar 19, 2019 6:09:29 PM fr.lip6.move.serialization.SerializationUtil serializePropertiesForITSLTLTools
INFO: Time to serialize properties into /home/mcc/execution/LTLFireability.ltl : 1 ms
Mar 19, 2019 6:09:29 PM fr.lip6.move.gal.semantics.DeterministicNextBuilder getDeterministicNext
INFO: Input system was already deterministic with 43 transitions.
Mar 19, 2019 6:09:29 PM fr.lip6.move.gal.gal2smt.bmc.KInductionSolver computeAndDeclareInvariants
INFO: Computed 22 place invariants in 20 ms
Mar 19, 2019 6:09:29 PM fr.lip6.move.gal.gal2smt.bmc.KInductionSolver init
INFO: Proved 54 variables to be positive in 152 ms
Mar 19, 2019 6:09:29 PM fr.lip6.move.gal.gal2smt.bmc.NecessaryEnablingsolver computeAblingMatrix
INFO: Computing symmetric may disable matrix : 43 transitions.
Mar 19, 2019 6:09:29 PM fr.lip6.move.gal.gal2smt.bmc.NecessaryEnablingsolver printStats
INFO: Computation of disable matrix completed :0/43 took 0 ms. Total solver calls (SAT/UNSAT): 0(0/0)
Mar 19, 2019 6:09:29 PM fr.lip6.move.gal.gal2smt.bmc.NecessaryEnablingsolver printStats
INFO: Computation of Complete disable matrix. took 3 ms. Total solver calls (SAT/UNSAT): 0(0/0)
Mar 19, 2019 6:09:29 PM fr.lip6.move.gal.gal2smt.bmc.NecessaryEnablingsolver computeAblingMatrix
INFO: Computing symmetric may enable matrix : 43 transitions.
Mar 19, 2019 6:09:29 PM fr.lip6.move.gal.gal2smt.bmc.NecessaryEnablingsolver printStats
INFO: Computation of Complete enable matrix. took 1 ms. Total solver calls (SAT/UNSAT): 0(0/0)
Mar 19, 2019 6:09:30 PM fr.lip6.move.gal.gal2smt.bmc.NecessaryEnablingsolver computeCoEnablingMatrix
INFO: Computing symmetric co enabling matrix : 43 transitions.
Mar 19, 2019 6:09:31 PM fr.lip6.move.gal.gal2smt.bmc.NecessaryEnablingsolver printStats
INFO: Computation of Finished co-enabling matrix. took 1202 ms. Total solver calls (SAT/UNSAT): 86(86/0)
Mar 19, 2019 6:09:31 PM fr.lip6.move.gal.gal2smt.bmc.NecessaryEnablingsolver computeDoNotAccord
INFO: Computing Do-Not-Accords matrix : 43 transitions.
Mar 19, 2019 6:09:32 PM fr.lip6.move.gal.gal2smt.bmc.NecessaryEnablingsolver printStats
INFO: Computation of Completed DNA matrix. took 576 ms. Total solver calls (SAT/UNSAT): 41(0/41)
Mar 19, 2019 6:09:32 PM fr.lip6.move.gal.gal2pins.Gal2PinsTransformerNext transform
INFO: Built C files in 3250ms conformant to PINS in folder :/home/mcc/execution

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="RefineWMG-PT-010011"
export BK_EXAMINATION="LTLFireability"
export BK_TOOL="itstools"
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 2-3817"
echo " Executing tool itstools"
echo " Input is RefineWMG-PT-010011, examination is LTLFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r140-smll-155284912800340"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/RefineWMG-PT-010011.tgz
mv RefineWMG-PT-010011 execution
cd execution
if [ "LTLFireability" = "GlobalProperties" ] ; then
rm -f GenericPropertiesVerdict.xml
fi
if [ "LTLFireability" = "UpperBounds" ] ; 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 [ "LTLFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "LTLFireability" != "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 "LTLFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property LTLFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "LTLFireability.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 '' LTLFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
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 ;