fond
Model Checking Contest 2021
11th edition, Paris, France, June 23, 2021
Execution of r055-oct2-162038331200007
Last Updated
Jun 28, 2021

About the Execution of 2020-gold for CircularTrains-PT-012

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
217.119 3631.00 6272.00 217.50 2 1 1 1 1 1 1 1 2 1 1 2 1 1 1 1 normal

Execution Chart

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

Trace from the execution

Formatting '/data/fko/mcc2021-input.r055-oct2-162038331200007.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fko/mcc2021-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 gold2020
Input is CircularTrains-PT-012, examination is UpperBounds
Time confinement is 3500 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r055-oct2-162038331200007
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 388K
-rw-r--r-- 1 mcc users 16K May 5 16:58 CTLCardinality.txt
-rw-r--r-- 1 mcc users 138K May 10 09:42 CTLCardinality.xml
-rw-r--r-- 1 mcc users 12K May 5 16:58 CTLFireability.txt
-rw-r--r-- 1 mcc users 84K May 10 09:42 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 6 14:48 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 3.2K Mar 28 15:50 LTLCardinality.txt
-rw-r--r-- 1 mcc users 21K Mar 28 15:50 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Mar 28 15:50 LTLFireability.txt
-rw-r--r-- 1 mcc users 16K Mar 28 15:50 LTLFireability.xml
-rw-r--r-- 1 mcc users 4.0K Mar 23 03:04 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 20K Mar 23 03:04 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 3.2K Mar 22 12:30 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 19K Mar 22 12:30 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Mar 22 09:10 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Mar 22 09:10 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 5 16:51 equiv_col
-rw-r--r-- 1 mcc users 4 May 5 16:51 instance
-rw-r--r-- 1 mcc users 6 May 5 16:51 iscolored
-rw-r--r-- 1 mcc users 9.2K May 5 16:51 model.pnml

--------------------
content from stdout:

=== Data for post analysis generated by BenchKit (invocation template)

The expected result is a vector of positive values
NUM_VECTOR

here is the order used to build the result vector(from text file)
FORMULA_NAME CircularTrains-PT-012-UpperBounds-00
FORMULA_NAME CircularTrains-PT-012-UpperBounds-01
FORMULA_NAME CircularTrains-PT-012-UpperBounds-02
FORMULA_NAME CircularTrains-PT-012-UpperBounds-03
FORMULA_NAME CircularTrains-PT-012-UpperBounds-04
FORMULA_NAME CircularTrains-PT-012-UpperBounds-05
FORMULA_NAME CircularTrains-PT-012-UpperBounds-06
FORMULA_NAME CircularTrains-PT-012-UpperBounds-07
FORMULA_NAME CircularTrains-PT-012-UpperBounds-08
FORMULA_NAME CircularTrains-PT-012-UpperBounds-09
FORMULA_NAME CircularTrains-PT-012-UpperBounds-10
FORMULA_NAME CircularTrains-PT-012-UpperBounds-11
FORMULA_NAME CircularTrains-PT-012-UpperBounds-12
FORMULA_NAME CircularTrains-PT-012-UpperBounds-13
FORMULA_NAME CircularTrains-PT-012-UpperBounds-14
FORMULA_NAME CircularTrains-PT-012-UpperBounds-15

=== Now, execution of the tool begins

BK_START 1620888196674

[2021-05-13 06:43:19] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, UpperBounds, -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, 3500]
[2021-05-13 06:43:19] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2021-05-13 06:43:19] [INFO ] Load time of PNML (sax parser for PT used): 22 ms
[2021-05-13 06:43:19] [INFO ] Transformed 24 places.
[2021-05-13 06:43:19] [INFO ] Transformed 12 transitions.
[2021-05-13 06:43:19] [INFO ] Parsed PT model containing 24 places and 12 transitions in 56 ms.
Parsed 16 properties from file /home/mcc/execution/UpperBounds.xml in 9 ms.
Finished random walk after 0 steps, including 0 resets, run visited all 0 properties in 1 ms. (steps per millisecond=0 )
[2021-05-13 06:43:19] [INFO ] Flatten gal took : 18 ms
[2021-05-13 06:43:19] [INFO ] Applying decomposition
[2021-05-13 06:43:19] [INFO ] Flatten gal took : 3 ms
[2021-05-13 06:43:19] [INFO ] Time to serialize gal into /home/mcc/execution/UpperBounds.pnml.gal : 8 ms
[2021-05-13 06:43:19] [INFO ] Time to serialize properties into /home/mcc/execution/UpperBounds.prop : 1 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-reach-linux64, --gc-threshold, 2000000, --quiet, -i, /home/mcc/execution/UpperBounds.pnml.gal, -t, CGAL, -reachable-file, UpperBounds.prop, --nowitness, --gen-order, FOLLOW], workingDir=/home/mcc/execution]

its-reach command run as :

/home/mcc/BenchKit/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202005100927/bin/its-reach-linux64 --gc-threshold 2000000 --quiet -i /home/mcc/execution/UpperBounds.pnml.gal -t CGAL -reachable-file UpperBounds.prop --nowitness --gen-order FOLLOW
Loading property file UpperBounds.prop.
Read [bounds] property : CircularTrains-PT-012-UpperBounds-00 with value :F2
Read [bounds] property : CircularTrains-PT-012-UpperBounds-01 with value :F6
Read [bounds] property : CircularTrains-PT-012-UpperBounds-02 with value :Section_7
Read [bounds] property : CircularTrains-PT-012-UpperBounds-03 with value :F1
Read [bounds] property : CircularTrains-PT-012-UpperBounds-04 with value :F4
Read [bounds] property : CircularTrains-PT-012-UpperBounds-05 with value :F9
Read [bounds] property : CircularTrains-PT-012-UpperBounds-06 with value :Section_5
Read [bounds] property : CircularTrains-PT-012-UpperBounds-07 with value :Section_3
Read [bounds] property : CircularTrains-PT-012-UpperBounds-08 with value :F5
Read [bounds] property : CircularTrains-PT-012-UpperBounds-09 with value :F6
Read [bounds] property : CircularTrains-PT-012-UpperBounds-10 with value :F9
Read [bounds] property : CircularTrains-PT-012-UpperBounds-11 with value :F8
Read [bounds] property : CircularTrains-PT-012-UpperBounds-12 with value :F7
Read [bounds] property : CircularTrains-PT-012-UpperBounds-13 with value :Section_6
Read [bounds] property : CircularTrains-PT-012-UpperBounds-14 with value :Section_1
Read [bounds] property : CircularTrains-PT-012-UpperBounds-15 with value :Section_7
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,195,0.012892,3604,2,198,5,786,6,0,111,625,0
Total reachable state count : 195

Verifying 16 reachability properties.
Min sum of variable value : 0
Maximum sum along a path : 2
Bounds property CircularTrains-PT-012-UpperBounds-00 :0 <= F2 <= 2
FORMULA CircularTrains-PT-012-UpperBounds-00 2 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-00,0,0.013211,3604,1,0,7,786,9,1,181,625,4
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-01 :0 <= F6 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-01 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-01,0,0.013371,3604,1,0,8,786,10,1,210,625,5
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-02 :0 <= Section_7 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-02 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-02,0,0.013491,3604,1,0,9,786,11,1,237,625,6
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-03 :0 <= F1 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-03 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-03,0,0.013677,3604,1,0,10,786,12,1,274,625,7
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-04 :0 <= F4 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-04 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-04,0,0.013882,3604,1,0,11,786,13,1,315,625,8
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-05 :0 <= F9 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-05 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-05,0,0.01394,3604,1,0,12,786,14,1,326,625,9
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-06 :0 <= Section_5 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-06 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-06,0,0.014267,3604,1,0,13,786,15,1,365,625,10
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-07 :0 <= Section_3 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-07 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-07,0,0.01458,3604,1,0,14,786,16,1,415,625,11
Min sum of variable value : 0
Maximum sum along a path : 2
Bounds property CircularTrains-PT-012-UpperBounds-08 :0 <= F5 <= 2
FORMULA CircularTrains-PT-012-UpperBounds-08 2 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-08,0,0.014816,3604,1,0,15,786,17,1,451,625,12
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-09 :0 <= F6 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-09 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-09,0,0.014852,3604,1,0,15,786,17,1,451,625,12
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-10 :0 <= F9 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-10 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-10,0,0.014885,3604,1,0,15,786,17,1,451,625,12
Min sum of variable value : 0
Maximum sum along a path : 2
Bounds property CircularTrains-PT-012-UpperBounds-11 :0 <= F8 <= 2
FORMULA CircularTrains-PT-012-UpperBounds-11 2 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-11,0,0.014976,3604,1,0,16,786,18,1,469,625,13
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-12 :0 <= F7 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-12 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-12,0,0.015083,3604,1,0,17,786,19,1,492,625,14
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-13 :0 <= Section_6 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-13 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-13,0,0.015257,3604,1,0,18,786,20,1,523,650,15
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-14 :0 <= Section_1 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-14 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-14,0,0.015444,3604,1,0,19,786,21,1,556,680,16
Min sum of variable value : 0
Maximum sum along a path : 1
Bounds property CircularTrains-PT-012-UpperBounds-15 :0 <= Section_7 <= 1
FORMULA CircularTrains-PT-012-UpperBounds-15 1 TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN

Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
CircularTrains-PT-012-UpperBounds-15,0,0.015478,3604,1,0,19,786,21,1,556,680,16

BK_STOP 1620888200305

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

+ export BINDIR=/home/mcc/BenchKit/
+ BINDIR=/home/mcc/BenchKit/
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ UpperBounds = StateSpace ]]
+ /home/mcc/BenchKit//runeclipse.sh /home/mcc/execution UpperBounds -its -ltsminpath /home/mcc/BenchKit//lts_install_dir/ -greatspnpath /home/mcc/BenchKit//greatspn/ -order META -manyOrder -smt -timeout 3500
+ 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 UpperBounds -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 3500 -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="CircularTrains-PT-012"
export BK_EXAMINATION="UpperBounds"
export BK_TOOL="gold2020"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="3500"
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 2-4028"
echo " Executing tool gold2020"
echo " Input is CircularTrains-PT-012, examination is UpperBounds"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r055-oct2-162038331200007"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/CircularTrains-PT-012.tgz
mv CircularTrains-PT-012 execution
cd execution
if [ "UpperBounds" = "ReachabilityDeadlock" ] || [ "UpperBounds" = "UpperBounds" ] || [ "UpperBounds" = "QuasiLiveness" ] || [ "UpperBounds" = "StableMarking" ] || [ "UpperBounds" = "Liveness" ] || [ "UpperBounds" = "OneSafe" ] || [ "UpperBounds" = "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 [ "UpperBounds" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "UpperBounds" != "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 "UpperBounds.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property UpperBounds.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "UpperBounds.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 '' UpperBounds.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "UpperBounds" = "ReachabilityDeadlock" ] || [ "UpperBounds" = "QuasiLiveness" ] || [ "UpperBounds" = "StableMarking" ] || [ "UpperBounds" = "Liveness" ] || [ "UpperBounds" = "OneSafe" ] ; then
echo "FORMULA_NAME UpperBounds"
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 ;