fond
Model Checking Contest 2020
10th edition, Paris, France, June 23, 2020
Execution of r051-ebro-158902546300500
Last Updated
Jun 28, 2020

About the Execution of ITS-Tools for DLCround-PT-06a

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
15743.410 5890.00 16281.00 92.30 TTTTFTFTFTFTTTFF normal

Execution Chart

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

Trace from the execution

Formatting '/mnt/tpsp/fkordon/mcc2020-input.r051-ebro-158902546300500.qcow2', fmt=qcow2 size=4294967296 backing_file='/mnt/tpsp/fkordon/mcc2020-input.qcow2' encryption=off cluster_size=65536 lazy_refcounts=off
Waiting for the VM to be ready (probing ssh)
......................
=====================================================================
Generated by BenchKit 2-4028
Executing tool itstools
Input is DLCround-PT-06a, examination is CTLFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r051-ebro-158902546300500
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 500K
-rw-r--r-- 1 mcc users 3.2K Mar 30 18:53 CTLCardinality.txt
-rw-r--r-- 1 mcc users 19K Mar 30 18:53 CTLCardinality.xml
-rw-r--r-- 1 mcc users 2.6K Mar 29 08:53 CTLFireability.txt
-rw-r--r-- 1 mcc users 18K Mar 29 08:53 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.0K Mar 24 05:37 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 5.9K Mar 24 05:37 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 3.2K Apr 8 14:50 LTLCardinality.txt
-rw-r--r-- 1 mcc users 24K Apr 28 14:00 LTLCardinality.xml
-rw-r--r-- 1 mcc users 1.9K Apr 8 14:50 LTLFireability.txt
-rw-r--r-- 1 mcc users 15K Apr 28 14:00 LTLFireability.xml
-rw-r--r-- 1 mcc users 3.3K Mar 28 04:51 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 17K Mar 28 04:51 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 2.6K Mar 26 23:21 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 15K Mar 26 23:21 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Mar 28 14:49 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Mar 28 14:49 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 24 05:37 equiv_col
-rw-r--r-- 1 mcc users 4 Mar 24 05:37 instance
-rw-r--r-- 1 mcc users 6 Mar 24 05:37 iscolored
-rw-r--r-- 1 mcc users 325K 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 DLCround-PT-06a-CTLFireability-00
FORMULA_NAME DLCround-PT-06a-CTLFireability-01
FORMULA_NAME DLCround-PT-06a-CTLFireability-02
FORMULA_NAME DLCround-PT-06a-CTLFireability-03
FORMULA_NAME DLCround-PT-06a-CTLFireability-04
FORMULA_NAME DLCround-PT-06a-CTLFireability-05
FORMULA_NAME DLCround-PT-06a-CTLFireability-06
FORMULA_NAME DLCround-PT-06a-CTLFireability-07
FORMULA_NAME DLCround-PT-06a-CTLFireability-08
FORMULA_NAME DLCround-PT-06a-CTLFireability-09
FORMULA_NAME DLCround-PT-06a-CTLFireability-10
FORMULA_NAME DLCround-PT-06a-CTLFireability-11
FORMULA_NAME DLCround-PT-06a-CTLFireability-12
FORMULA_NAME DLCround-PT-06a-CTLFireability-13
FORMULA_NAME DLCround-PT-06a-CTLFireability-14
FORMULA_NAME DLCround-PT-06a-CTLFireability-15

=== Now, execution of the tool begins

BK_START 1589607004344

[2020-05-16 05:30:07] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, CTLFireability, -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]
[2020-05-16 05:30:07] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2020-05-16 05:30:07] [INFO ] Load time of PNML (sax parser for PT used): 212 ms
[2020-05-16 05:30:07] [INFO ] Transformed 197 places.
[2020-05-16 05:30:07] [INFO ] Transformed 1313 transitions.
[2020-05-16 05:30:07] [INFO ] Found NUPN structural information;
[2020-05-16 05:30:07] [INFO ] Parsed PT model containing 197 places and 1313 transitions in 311 ms.
Ensure Unique test removed 135 transitions
Reduce redundant transitions removed 135 transitions.
Parsed 16 properties from file /home/mcc/execution/CTLFireability.xml in 59 ms.
Finished random walk after 1066 steps, including 0 resets, run visited all 62 properties in 27 ms. (steps per millisecond=39 )
[2020-05-16 05:30:08] [INFO ] Initial state reduction rules for CTL removed 4 formulas.
[2020-05-16 05:30:08] [INFO ] Flatten gal took : 209 ms
[2020-05-16 05:30:08] [INFO ] Initial state reduction rules for CTL removed 4 formulas.
[2020-05-16 05:30:08] [INFO ] Flatten gal took : 110 ms
FORMULA DLCround-PT-06a-CTLFireability-15 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA DLCround-PT-06a-CTLFireability-14 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA DLCround-PT-06a-CTLFireability-12 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA DLCround-PT-06a-CTLFireability-11 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2020-05-16 05:30:08] [INFO ] Applying decomposition
[2020-05-16 05:30:08] [INFO ] Flatten gal took : 92 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/graph13285532768021523090.txt, -o, /tmp/graph13285532768021523090.bin, -w, /tmp/graph13285532768021523090.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/graph13285532768021523090.bin, -l, -1, -v, -w, /tmp/graph13285532768021523090.weights, -q, 0, -e, 0.001], workingDir=null]
[2020-05-16 05:30:09] [INFO ] Decomposing Gal with order
[2020-05-16 05:30:09] [INFO ] Rewriting arrays to variables to allow decomposition.
[2020-05-16 05:30:09] [INFO ] Removed a total of 1097 redundant transitions.
[2020-05-16 05:30:09] [INFO ] Flatten gal took : 245 ms
[2020-05-16 05:30:09] [INFO ] Fuse similar labels procedure discarded/fused a total of 96 labels/synchronizations in 29 ms.
[2020-05-16 05:30:09] [INFO ] Time to serialize gal into /home/mcc/execution/CTLFireability.pnml.gal : 21 ms
[2020-05-16 05:30:09] [INFO ] Time to serialize properties into /home/mcc/execution/CTLFireability.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/CTLFireability.pnml.gal, -t, CGAL, -ctl, /home/mcc/execution/CTLFireability.ctl], 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/CTLFireability.pnml.gal -t CGAL -ctl /home/mcc/execution/CTLFireability.ctl
No direction supplied, using forward translation only.
Parsed 12 CTL formulae.
built 50 ordering constraints for composite.
built 22 ordering constraints for composite.
built 22 ordering constraints for composite.
built 22 ordering constraints for composite.
built 17 ordering constraints for composite.
built 22 ordering constraints for composite.
built 22 ordering constraints for composite.
built 17 ordering constraints for composite.
Model ,|S| ,Time ,Mem(kb) ,fin. SDD ,fin. DDD ,peak SDD ,peak DDD ,SDD Hom ,SDD cache peak ,DDD Hom ,DDD cachepeak ,SHom cache
reachable,2.401e+10,0.150664,9244,52,154,306,1457,565,255,329,1939,0


Converting to forward existential form...Done !
original formula: AX(((EF(((i6.u11.p54==1)&&(i6.u12.p122==1))) * ((u2.p19!=1)||((i4.u4.p32==1)&&(i4.u6.p100==1)))) * (((((u1.p11!=1)||(i5.u7.p109!=1))||(i4.u6.p37!=1))||(i8.u17.p179!=1)) + EX(((u3.p23==1)&&(i6.u10.p121==1))))))
=> equivalent forward existential formula: (([(EY(Init) * !(E(TRUE U ((i6.u11.p54==1)&&(i6.u12.p122==1)))))] = FALSE * [(EY(Init) * !(((u2.p19!=1)||((i4.u4.p32==1)&&(i4.u6.p100==1)))))] = FALSE) * [((EY(Init) * !(((((u1.p11!=1)||(i5.u7.p109!=1))||(i4.u6.p37!=1))||(i8.u17.p179!=1)))) * !(EX(((u3.p23==1)&&(i6.u10.p121==1)))))] = FALSE)
Reverse transition relation is exact ! Faster fixpoint algorithm enabled.
(forward)formula 0,1,0.207851,9804,1,0,596,2677,2026,576,1750,2303,2668
FORMULA DLCround-PT-06a-CTLFireability-00 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is TRUE !

***************************************

original formula: (EF(EG(((((i8.u17.p69==1)&&(i8.u17.p182==1))&&(i4.u6.p36==1))&&(i4.u6.p102==1)))) + EX(AG(((i6.u12.p51!=1)||(i6.u12.p116!=1)))))
=> equivalent forward existential formula: ([FwdG(FwdU(Init,TRUE),((((i8.u17.p69==1)&&(i8.u17.p182==1))&&(i4.u6.p36==1))&&(i4.u6.p102==1)))] != FALSE + [(EY(Init) * !(E(TRUE U !(((i6.u12.p51!=1)||(i6.u12.p116!=1))))))] != FALSE)
Using saturation style SCC detection
Using saturation style SCC detection
Using saturation style SCC detection
Fast SCC detection found an SCC at level 1
Fast SCC detection found an SCC at level 2
Fast SCC detection found an SCC at level 3
Fast SCC detection found an SCC at level 4
Fast SCC detection found an SCC at level 5
Fast SCC detection found an SCC at level 6
Fast SCC detection found an SCC at level 7
Fast SCC detection found an SCC at level 8
Fast SCC detection found an SCC at level 9
Fast SCC detection found an SCC at level 10
(forward)formula 1,1,0.245366,9804,1,0,850,3206,2479,962,1899,3885,3885
FORMULA DLCround-PT-06a-CTLFireability-01 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is TRUE !

***************************************

original formula: (!(EF(AG(((i5.u7.p42==1)&&(i5.u9.p110==1))))) * !(AX((i8.u17.p70==1))))
=> equivalent forward existential formula: ([(FwdU(Init,TRUE) * !(E(TRUE U !(((i5.u7.p42==1)&&(i5.u9.p110==1))))))] = FALSE * [(Init * !(EX(!((i8.u17.p70==1)))))] = FALSE)
(forward)formula 2,1,0.248593,9804,1,0,923,3302,2492,1023,1900,3950,4144
FORMULA DLCround-PT-06a-CTLFireability-02 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is TRUE !

***************************************

original formula: EF(EG(((i10.u22.p91==1)&&(i10.u22.p194==1))))
=> equivalent forward existential formula: [FwdG(FwdU(Init,TRUE),((i10.u22.p91==1)&&(i10.u22.p194==1)))] != FALSE
(forward)formula 3,1,0.253208,9804,1,0,1116,3310,2639,1254,1904,3992,4568
FORMULA DLCround-PT-06a-CTLFireability-03 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is TRUE !

***************************************

original formula: E(EX(((i4.u6.p38==1)||((i4.u5.p35==1)&&(i4.u6.p158==1)))) U AX((u0.p6==1)))
=> equivalent forward existential formula: [(FwdU(Init,EX(((i4.u6.p38==1)||((i4.u5.p35==1)&&(i4.u6.p158==1))))) * !(EX(!((u0.p6==1)))))] != FALSE
(forward)formula 4,0,0.255209,9804,1,0,1261,3329,2642,1460,1905,4060,5044
FORMULA DLCround-PT-06a-CTLFireability-04 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is FALSE !

***************************************

original formula: (AG(EF(((i7.u14.p61==1)&&(i7.u14.p124==1)))) + AG(((u2.p15==1)&&(i4.u4.p103==1))))
=> equivalent forward existential formula: [(FwdU((Init * !(!(E(TRUE U !(E(TRUE U ((i7.u14.p61==1)&&(i7.u14.p124==1)))))))),TRUE) * !(((u2.p15==1)&&(i4.u4.p103==1))))] = FALSE
(forward)formula 5,1,0.257642,9804,1,0,1282,3335,2659,1468,1908,4071,5101
FORMULA DLCround-PT-06a-CTLFireability-05 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is TRUE !

***************************************

original formula: !(EF(EG(((i4.u4.p33==1)&&(i4.u6.p106==1)))))
=> equivalent forward existential formula: [FwdG(FwdU(Init,TRUE),((i4.u4.p33==1)&&(i4.u6.p106==1)))] = FALSE
(forward)formula 6,0,0.262768,9804,1,0,1454,3335,2709,1727,1908,4081,5973
FORMULA DLCround-PT-06a-CTLFireability-06 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is FALSE !

***************************************

original formula: AG(EF(((i5.u7.p43==1)&&(i5.u9.p162==1))))
=> equivalent forward existential formula: [(FwdU(Init,TRUE) * !(E(TRUE U ((i5.u7.p43==1)&&(i5.u9.p162==1)))))] = FALSE
(forward)formula 7,1,0.264555,9804,1,0,1463,3335,2717,1728,1909,4081,6032
FORMULA DLCround-PT-06a-CTLFireability-07 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is TRUE !

***************************************

original formula: AG((((i8.u16.p75!=1)||(i8.u17.p138!=1))||(i5.u7.p43!=1)))
=> equivalent forward existential formula: [(FwdU(Init,TRUE) * !((((i8.u16.p75!=1)||(i8.u17.p138!=1))||(i5.u7.p43!=1))))] = FALSE
(forward)formula 8,0,0.265939,9804,1,0,1486,3336,2728,1766,1910,4082,6080
FORMULA DLCround-PT-06a-CTLFireability-08 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is FALSE !

***************************************

original formula: AG(((!(AG(((i10.u22.p96==1)&&(i10.u22.p196==1)))) + (i8.u17.p77!=1)) + (i8.u15.p133!=1)))
=> equivalent forward existential formula: [(((FwdU(Init,TRUE) * !((i8.u15.p133!=1))) * !((i8.u17.p77!=1))) * !(E(TRUE U !(((i10.u22.p96==1)&&(i10.u22.p196==1))))))] = FALSE
(forward)formula 9,1,0.267291,9804,1,0,1490,3336,2743,1771,1917,4094,6094
FORMULA DLCround-PT-06a-CTLFireability-09 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is TRUE !

***************************************

original formula: AG((((((AX(((u0.p7==1)&&(i6.u12.p116==1))) + (i10.u22.p97!=1)) + (i10.u22.p152!=1)) + (i4.u5.p34!=1)) + (i4.u6.p157!=1)) + ((u2.p18==1)&&(i5.u7.p111==1))))
=> equivalent forward existential formula: [(EY((((((FwdU(Init,TRUE) * !(((u2.p18==1)&&(i5.u7.p111==1)))) * !((i4.u6.p157!=1))) * !((i4.u5.p34!=1))) * !((i10.u22.p152!=1))) * !((i10.u22.p97!=1)))) * !(((u0.p7==1)&&(i6.u12.p116==1))))] = FALSE
(forward)formula 10,0,0.273178,9804,1,0,1731,3405,2773,2084,1922,4357,6716
FORMULA DLCround-PT-06a-CTLFireability-10 FALSE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is FALSE !

***************************************

original formula: EF(((i4.u6.p31==1)&&(i4.u6.p160==1)))
=> equivalent forward existential formula: [(FwdU(Init,TRUE) * ((i4.u6.p31==1)&&(i4.u6.p160==1)))] != FALSE
(forward)formula 11,1,0.274028,9804,1,0,1743,3405,2785,2097,1926,4367,6740
FORMULA DLCround-PT-06a-CTLFireability-13 TRUE TECHNIQUES DECISION_DIAGRAMS TOPOLOGICAL USE_NUPN
Formula is TRUE !

***************************************


BK_STOP 1589607010234

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

+ export BINDIR=/home/mcc/BenchKit/
+ BINDIR=/home/mcc/BenchKit/
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ CTLFireability = StateSpace ]]
+ /home/mcc/BenchKit//runeclipse.sh /home/mcc/execution CTLFireability -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 CTLFireability -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="DLCround-PT-06a"
export BK_EXAMINATION="CTLFireability"
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 DLCround-PT-06a, examination is CTLFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r051-ebro-158902546300500"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/DLCround-PT-06a.tgz
mv DLCround-PT-06a execution
cd execution
if [ "CTLFireability" = "ReachabilityDeadlock" ] || [ "CTLFireability" = "UpperBounds" ] || [ "CTLFireability" = "QuasiLiveness" ] || [ "CTLFireability" = "StableMarking" ] || [ "CTLFireability" = "Liveness" ] || [ "CTLFireability" = "OneSafe" ] || [ "CTLFireability" = "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 [ "CTLFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "CTLFireability" != "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 "CTLFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property CTLFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "CTLFireability.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 '' CTLFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "CTLFireability" = "ReachabilityDeadlock" ] || [ "CTLFireability" = "QuasiLiveness" ] || [ "CTLFireability" = "StableMarking" ] || [ "CTLFireability" = "Liveness" ] || [ "CTLFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME CTLFireability"
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 ;