fond
Model Checking Contest 2020
10th edition, Paris, France, June 23, 2020
Execution of r021-oct2-158897699000419
Last Updated
Jun 28, 2020

About the Execution of ITS-Tools for BridgeAndVehicles-PT-V80P20N50

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
15743.300 3289762.00 3447098.00 4868.50 ??F??T??FTF?F??? normal

Execution Chart

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

Trace from the execution

Formatting '/data/fko/mcc2020-input.r021-oct2-158897699000419.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fko/mcc2020-input.qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
.....................
=====================================================================
Generated by BenchKit 2-4028
Executing tool itstools
Input is BridgeAndVehicles-PT-V80P20N50, examination is CTLCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r021-oct2-158897699000419
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 15M
-rw-r--r-- 1 mcc users 11K Mar 26 02:42 CTLCardinality.txt
-rw-r--r-- 1 mcc users 40K Mar 26 02:42 CTLCardinality.xml
-rw-r--r-- 1 mcc users 217K Mar 25 22:12 CTLFireability.txt
-rw-r--r-- 1 mcc users 628K Mar 25 22:12 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.0K Mar 24 05:37 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.1K Mar 24 05:37 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 14K Apr 8 14:43 LTLCardinality.txt
-rw-r--r-- 1 mcc users 52K Apr 28 14:00 LTLCardinality.xml
-rw-r--r-- 1 mcc users 486K Apr 8 14:43 LTLFireability.txt
-rw-r--r-- 1 mcc users 1.5M Apr 28 14:00 LTLFireability.xml
-rw-r--r-- 1 mcc users 17K Mar 25 17:40 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 54K Mar 25 17:40 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 492K Mar 25 14:03 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 1.4M Mar 25 14:03 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 2.7K Mar 25 17:55 UpperBounds.txt
-rw-r--r-- 1 mcc users 5.7K Mar 25 17:55 UpperBounds.xml
-rw-r--r-- 1 mcc users 5 Mar 24 05:37 equiv_col
-rw-r--r-- 1 mcc users 10 Mar 24 05:37 instance
-rw-r--r-- 1 mcc users 6 Mar 24 05:37 iscolored
-rw-r--r-- 1 mcc users 9.5M 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 BridgeAndVehicles-PT-V80P20N50-CTLCardinality-00
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-01
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-02
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-03
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-04
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-05
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-06
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-07
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-08
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-09
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-10
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-11
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-12
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-13
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-14
FORMULA_NAME BridgeAndVehicles-PT-V80P20N50-CTLCardinality-15

=== Now, execution of the tool begins

BK_START 1589245214747

[2020-05-12 01:00:17] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, CTLCardinality, -z3path, /home/mcc/BenchKit//z3/bin/z3, -yices2path, /home/mcc/BenchKit//yices/bin/yices, -its, -ltsminpath, /home/mcc/BenchKit//lts_install_dir/, -greatspnpath, /home/mcc/BenchKit//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2020-05-12 01:00:18] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2020-05-12 01:00:18] [INFO ] Load time of PNML (sax parser for PT used): 602 ms
[2020-05-12 01:00:18] [INFO ] Transformed 228 places.
[2020-05-12 01:00:18] [INFO ] Transformed 8588 transitions.
[2020-05-12 01:00:18] [INFO ] Parsed PT model containing 228 places and 8588 transitions in 760 ms.
Parsed 16 properties from file /home/mcc/execution/CTLCardinality.xml in 263 ms.
Incomplete random walk after 100000 steps, including 147 resets, run finished after 1977 ms. (steps per millisecond=50 ) properties seen :[1, 0, 1, 0, 1, 0, 0, 1, 1, 1, 1, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 1, 1, 1, 1]
[2020-05-12 01:00:21] [INFO ] Flow matrix only has 530 transitions (discarded 8058 similar events)
// Phase 1: matrix 530 rows 228 cols
[2020-05-12 01:00:21] [INFO ] Computed 7 place invariants in 37 ms
[2020-05-12 01:00:21] [INFO ] [Real]Absence check using 7 positive place invariants in 75 ms returned sat
[2020-05-12 01:00:21] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-05-12 01:00:22] [INFO ] [Real]Absence check using state equation in 849 ms returned sat
[2020-05-12 01:00:22] [INFO ] Solution in real domain found non-integer solution.
[2020-05-12 01:00:22] [INFO ] [Nat]Absence check using 7 positive place invariants in 47 ms returned sat
[2020-05-12 01:00:22] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2020-05-12 01:00:23] [INFO ] [Nat]Absence check using state equation in 603 ms returned sat
[2020-05-12 01:00:23] [INFO ] State equation strengthened by 102 read => feed constraints.
[2020-05-12 01:00:23] [INFO ] [Nat]Added 102 Read/Feed constraints in 133 ms returned sat
[2020-05-12 01:00:24] [INFO ] Computed and/alt/rep : 8585/466409/527 causal constraints in 1172 ms.
[2020-05-12 01:00:42] [INFO ] Added : 245 causal constraints over 49 iterations in 18915 ms. Result :unknown
[2020-05-12 01:00:42] [INFO ] [Real]Absence check using 7 positive place invariants in 7 ms returned sat
[2020-05-12 01:00:42] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-05-12 01:00:43] [INFO ] [Real]Absence check using state equation in 820 ms returned sat
[2020-05-12 01:00:43] [INFO ] Solution in real domain found non-integer solution.
[2020-05-12 01:00:43] [INFO ] [Nat]Absence check using 7 positive place invariants in 9 ms returned sat
[2020-05-12 01:00:43] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2020-05-12 01:00:44] [INFO ] [Nat]Absence check using state equation in 416 ms returned sat
[2020-05-12 01:00:44] [INFO ] [Nat]Added 102 Read/Feed constraints in 145 ms returned sat
[2020-05-12 01:00:45] [INFO ] Computed and/alt/rep : 8585/466409/527 causal constraints in 1067 ms.
[2020-05-12 01:01:01] [INFO ] Added : 210 causal constraints over 42 iterations in 17155 ms. Result :sat
[2020-05-12 01:01:02] [INFO ] Deduced a trap composed of 5 places in 1594 ms
[2020-05-12 01:01:03] [INFO ] Trap strengthening (SAT) tested/added 2/1 trap constraints in 1917 ms
[2020-05-12 01:01:03] [INFO ] [Real]Absence check using 7 positive place invariants in 6 ms returned unsat
[2020-05-12 01:01:03] [INFO ] [Real]Absence check using 7 positive place invariants in 7 ms returned sat
[2020-05-12 01:01:03] [INFO ] [Real]Adding state equation constraints to refine reachable states.
[2020-05-12 01:01:03] [INFO ] [Real]Absence check using state equation in 503 ms returned sat
[2020-05-12 01:01:04] [INFO ] Solution in real domain found non-integer solution.
[2020-05-12 01:01:04] [INFO ] [Nat]Absence check using 7 positive place invariants in 27 ms returned sat
[2020-05-12 01:01:04] [INFO ] [Nat]Adding state equation constraints to refine reachable states.
[2020-05-12 01:01:05] [INFO ] [Nat]Absence check using state equation in 959 ms returned sat
[2020-05-12 01:01:05] [INFO ] [Nat]Added 102 Read/Feed constraints in 112 ms returned sat
[2020-05-12 01:01:05] [INFO ] Deduced a trap composed of 5 places in 524 ms
[2020-05-12 01:01:05] [INFO ] Trap strengthening (SAT) tested/added 2/1 trap constraints in 659 ms
[2020-05-12 01:01:06] [INFO ] Computed and/alt/rep : 8585/466409/527 causal constraints in 604 ms.
[2020-05-12 01:01:24] [INFO ] Added : 240 causal constraints over 48 iterations in 18189 ms. Result :unknown
[2020-05-12 01:01:24] [INFO ] [Real]Absence check using 7 positive place invariants in 14 ms returned unsat
[2020-05-12 01:01:24] [INFO ] [Real]Absence check using 7 positive place invariants in 24 ms returned unsat
[2020-05-12 01:01:24] [INFO ] [Real]Absence check using 7 positive place invariants in 52 ms returned unsat
[2020-05-12 01:01:24] [INFO ] [Real]Absence check using 7 positive place invariants in 6 ms returned unsat
[2020-05-12 01:01:24] [INFO ] [Real]Absence check using 7 positive place invariants in 48 ms returned unsat
[2020-05-12 01:01:24] [INFO ] [Real]Absence check using 7 positive place invariants in 31 ms returned unsat
[2020-05-12 01:01:24] [INFO ] [Real]Absence check using 7 positive place invariants in 6 ms returned unsat
[2020-05-12 01:01:24] [INFO ] [Real]Absence check using 7 positive place invariants in 42 ms returned unsat
Successfully simplified 9 atomic propositions for a total of 9 simplifications.
[2020-05-12 01:01:25] [INFO ] Initial state reduction rules for CTL removed 5 formulas.
[2020-05-12 01:01:26] [INFO ] Flatten gal took : 1036 ms
[2020-05-12 01:01:26] [INFO ] Initial state reduction rules for CTL removed 6 formulas.
[2020-05-12 01:01:26] [INFO ] Flatten gal took : 718 ms
FORMULA BridgeAndVehicles-PT-V80P20N50-CTLCardinality-12 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BridgeAndVehicles-PT-V80P20N50-CTLCardinality-10 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BridgeAndVehicles-PT-V80P20N50-CTLCardinality-09 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BridgeAndVehicles-PT-V80P20N50-CTLCardinality-08 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BridgeAndVehicles-PT-V80P20N50-CTLCardinality-05 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA BridgeAndVehicles-PT-V80P20N50-CTLCardinality-02 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2020-05-12 01:01:27] [INFO ] Applying decomposition
[2020-05-12 01:01:27] [INFO ] Flatten gal took : 610 ms
Converted graph to binary with : CommandLine [args=[/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.louvain.binaries_1.0.0.202005100927/bin/convert-linux64, -i, /tmp/graph17056269684266482412.txt, -o, /tmp/graph17056269684266482412.bin, -w, /tmp/graph17056269684266482412.weights], workingDir=null]
Built communities with : CommandLine [args=[/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.louvain.binaries_1.0.0.202005100927/bin/louvain-linux64, /tmp/graph17056269684266482412.bin, -l, -1, -v, -w, /tmp/graph17056269684266482412.weights, -q, 0, -e, 0.001], workingDir=null]
[2020-05-12 01:01:30] [INFO ] Decomposing Gal with order
[2020-05-12 01:01:30] [INFO ] Rewriting arrays to variables to allow decomposition.
[2020-05-12 01:02:03] [INFO ] Removed a total of 14776 redundant transitions.
[2020-05-12 01:02:05] [INFO ] Flatten gal took : 34544 ms
[2020-05-12 01:02:09] [INFO ] Fuse similar labels procedure discarded/fused a total of 11765 labels/synchronizations in 1727 ms.
[2020-05-12 01:02:11] [INFO ] Time to serialize gal into /home/mcc/execution/CTLCardinality.pnml.gal : 203 ms
[2020-05-12 01:02:11] [INFO ] Time to serialize properties into /home/mcc/execution/CTLCardinality.ctl : 7 ms
Invoking ITS tools like this :CommandLine [args=[/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202005100927/bin/its-ctl-linux64, --gc-threshold, 2000000, --quiet, -i, /home/mcc/execution/CTLCardinality.pnml.gal, -t, CGAL, -ctl, /home/mcc/execution/CTLCardinality.ctl, --gen-order, FOLLOW], workingDir=/home/mcc/execution]

its-ctl command run as :

/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202005100927/bin/its-ctl-linux64 --gc-threshold 2000000 --quiet -i /home/mcc/execution/CTLCardinality.pnml.gal -t CGAL -ctl /home/mcc/execution/CTLCardinality.ctl --gen-order FOLLOW
No direction supplied, using forward translation only.
Parsed 10 CTL formulae.
Detected timeout of ITS tools.
[2020-05-12 01:22:34] [INFO ] Flatten gal took : 452 ms
[2020-05-12 01:22:34] [INFO ] Time to serialize gal into /home/mcc/execution/CTLCardinality.pnml.gal : 102 ms
[2020-05-12 01:22:34] [INFO ] Time to serialize properties into /home/mcc/execution/CTLCardinality.ctl : 9 ms
Invoking ITS tools like this :CommandLine [args=[/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202005100927/bin/its-ctl-linux64, --gc-threshold, 2000000, --quiet, -i, /home/mcc/execution/CTLCardinality.pnml.gal, -t, CGAL, -ctl, /home/mcc/execution/CTLCardinality.ctl, --gen-order, FOLLOW], workingDir=/home/mcc/execution]

its-ctl command run as :

/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202005100927/bin/its-ctl-linux64 --gc-threshold 2000000 --quiet -i /home/mcc/execution/CTLCardinality.pnml.gal -t CGAL -ctl /home/mcc/execution/CTLCardinality.ctl --gen-order FOLLOW
No direction supplied, using forward translation only.
Parsed 10 CTL formulae.
ITS-tools command line returned an error code 137
[2020-05-12 01:34:16] [INFO ] Flatten gal took : 2463 ms
[2020-05-12 01:34:36] [INFO ] Input system was already deterministic with 8588 transitions.
[2020-05-12 01:34:36] [INFO ] Transformed 228 places.
[2020-05-12 01:34:38] [INFO ] Transformed 8588 transitions.
Running greatSPN : CommandLine [args=[/home/mcc/BenchKit//greatspn//bin/pinvar, /home/mcc/execution/gspn], workingDir=/home/mcc/execution]
Run of greatSPN captured in /home/mcc/execution/outPut.txt
Running greatSPN : CommandLine [args=[/home/mcc/BenchKit//greatspn//bin/RGMEDD2, /home/mcc/execution/gspn, -META, -varord-only], workingDir=/home/mcc/execution]
Run of greatSPN captured in /home/mcc/execution/outPut.txt
Using order generated by GreatSPN with heuristic : META
[2020-05-12 01:34:39] [INFO ] Time to serialize gal into /home/mcc/execution/CTLCardinality.pnml.gal : 211 ms
[2020-05-12 01:34:39] [INFO ] Time to serialize properties into /home/mcc/execution/CTLCardinality.ctl : 3 ms
Invoking ITS tools like this :CommandLine [args=[/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202005100927/bin/its-ctl-linux64, --gc-threshold, 2000000, --quiet, -i, /home/mcc/execution/CTLCardinality.pnml.gal, -t, CGAL, -ctl, /home/mcc/execution/CTLCardinality.ctl, --load-order, /home/mcc/execution/model.ord, --gen-order, FOLLOW], workingDir=/home/mcc/execution]

its-ctl command run as :

/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202005100927/bin/its-ctl-linux64 --gc-threshold 2000000 --quiet -i /home/mcc/execution/CTLCardinality.pnml.gal -t CGAL -ctl /home/mcc/execution/CTLCardinality.ctl --load-order /home/mcc/execution/model.ord --gen-order FOLLOW
Successfully loaded order from file /home/mcc/execution/model.ord
No direction supplied, using forward translation only.
Parsed 10 CTL formulae.
Detected timeout of ITS tools.

BK_STOP 1589248504509

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

+ export BINDIR=/home/mcc/BenchKit/
+ BINDIR=/home/mcc/BenchKit/
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ CTLCardinality = StateSpace ]]
+ /home/mcc/BenchKit//runeclipse.sh /home/mcc/execution CTLCardinality -its -ltsminpath /home/mcc/BenchKit//lts_install_dir/ -greatspnpath /home/mcc/BenchKit//greatspn/ -order META -manyOrder -smt -timeout 3600
+ 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 CTLCardinality -z3path /home/mcc/BenchKit//z3/bin/z3 -yices2path /home/mcc/BenchKit//yices/bin/yices -its -ltsminpath /home/mcc/BenchKit//lts_install_dir/ -greatspnpath /home/mcc/BenchKit//greatspn/ -order META -manyOrder -smt -timeout 3600 -vmargs -Dosgi.locking=none -Declipse.stateSaveDelayInterval=-1 -Dosgi.configuration.area=/tmp/.eclipse -Xss128m -Xms40m -Xmx16000m -Dfile.encoding=UTF-8 -Dosgi.requiredJavaVersion=1.6

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="BridgeAndVehicles-PT-V80P20N50"
export BK_EXAMINATION="CTLCardinality"
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 2-4028"
echo " Executing tool itstools"
echo " Input is BridgeAndVehicles-PT-V80P20N50, examination is CTLCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r021-oct2-158897699000419"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/BridgeAndVehicles-PT-V80P20N50.tgz
mv BridgeAndVehicles-PT-V80P20N50 execution
cd execution
if [ "CTLCardinality" = "ReachabilityDeadlock" ] || [ "CTLCardinality" = "UpperBounds" ] || [ "CTLCardinality" = "QuasiLiveness" ] || [ "CTLCardinality" = "StableMarking" ] || [ "CTLCardinality" = "Liveness" ] || [ "CTLCardinality" = "OneSafe" ] || [ "CTLCardinality" = "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 [ "CTLCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "CTLCardinality" != "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 "CTLCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property CTLCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "CTLCardinality.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 '' CTLCardinality.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "CTLCardinality" = "ReachabilityDeadlock" ] || [ "CTLCardinality" = "QuasiLiveness" ] || [ "CTLCardinality" = "StableMarking" ] || [ "CTLCardinality" = "Liveness" ] || [ "CTLCardinality" = "OneSafe" ] ; then
echo "FORMULA_NAME CTLCardinality"
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 ;