fond
Model Checking Contest 2018
8th edition, Bratislava, Slovakia, June 26, 2018
Execution of r095-blw7-152650007300357
Last Updated
June 26, 2018

About the Execution of M4M.struct for GPPP-PT-C1000N0000001000

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
15919.140 209587.00 425538.00 2082.50 ???????????????? normal

Execution Chart

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

Trace from the execution

Waiting for the VM to be ready (probing ssh)
..............
/home/mcc/execution
total 188K
-rw-r--r-- 1 mcc users 3.4K May 15 18:54 CTLCardinality.txt
-rw-r--r-- 1 mcc users 19K May 15 18:54 CTLCardinality.xml
-rw-r--r-- 1 mcc users 2.8K May 15 18:54 CTLFireability.txt
-rw-r--r-- 1 mcc users 15K May 15 18:54 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.0K May 15 18:50 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 5.7K May 15 18:50 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 2.6K May 26 09:26 LTLCardinality.txt
-rw-r--r-- 1 mcc users 12K May 26 09:26 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K May 26 09:26 LTLFireability.txt
-rw-r--r-- 1 mcc users 9.7K May 26 09:26 LTLFireability.xml
-rw-r--r-- 1 mcc users 3.9K May 15 18:54 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 20K May 15 18:54 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 115 May 15 18:54 ReachabilityDeadlock.txt
-rw-r--r-- 1 mcc users 353 May 15 18:54 ReachabilityDeadlock.xml
-rw-r--r-- 1 mcc users 3.7K May 15 18:54 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 19K May 15 18:54 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K May 15 18:54 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.8K May 15 18:54 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 15 18:50 equiv_col
-rw-r--r-- 1 mcc users 17 May 15 18:50 instance
-rw-r--r-- 1 mcc users 6 May 15 18:50 iscolored
-rw-r--r-- 1 mcc users 21K May 15 18:50 model.pnml
=====================================================================
Generated by BenchKit 2-3637
Executing tool mcc4mcc-structural
Input is GPPP-PT-C1000N0000001000, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r095-blw7-152650007300357
=====================================================================


--------------------
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 GPPP-PT-C1000N0000001000-ReachabilityFireability-00
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-01
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-02
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-03
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-04
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-05
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-06
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-07
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-08
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-09
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-10
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-11
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-12
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-13
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-14
FORMULA_NAME GPPP-PT-C1000N0000001000-ReachabilityFireability-15

=== Now, execution of the tool begins

BK_START 1527636094983


BK_STOP 1527636304570

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

Prefix is 75f5f979.
Reading known information in /usr/share/mcc4mcc/75f5f979-known.json.
Reading learned information in /usr/share/mcc4mcc/75f5f979-learned.json.
Reading value translations in /usr/share/mcc4mcc/75f5f979-values.json.
Using directory /home/mcc/execution for input, as it contains a model.pnml file.
Using GPPP-PT-C1000N0000001000 as instance name.
Using GPPP as model name.
Using algorithm or tool decision-tree.
Model characteristics are: {'Examination': 'ReachabilityFireability', 'Place/Transition': True, 'Colored': False, 'Relative-Time': 1, 'Relative-Memory': 1, 'Ordinary': False, 'Simple Free Choice': False, 'Extended Free Choice': False, 'State Machine': False, 'Marked Graph': False, 'Connected': True, 'Strongly Connected': True, 'Source Place': False, 'Sink Place': False, 'Source Transition': False, 'Sink Transition': False, 'Loop Free': True, 'Conservative': False, 'Sub-Conservative': False, 'Nested Units': False, 'Safe': False, 'Deadlock': None, 'Reversible': None, 'Quasi Live': True, 'Live': None}.
Known tools are: [{'Time': 7499, 'Memory': 451.48, 'Tool': 'itstools'}, {'Time': 8078, 'Memory': 423.38, 'Tool': 'itstools'}, {'Time': 507841, 'Memory': 15951.52, 'Tool': 'lola'}, {'Time': 582336, 'Memory': 15951.33, 'Tool': 'lola'}].
Learned tools are: [{'Tool': 'lola'}].
Learned tool lola is 67.72116282170956x far from the best tool itstools.
ReachabilityFireability lola GPPP-PT-C1000N0000001000...

Time: 3600 - MCC
----- Start make prepare stdout -----
----- Start make prepare stderr -----
===========================================================================================
GPPP-PT-C1000N0000001000: translating PT Petri net model.pnml into LoLA format
===========================================================================================
translating PT Petri net complete


checking for too many tokens
===========================================================================================
GPPP-PT-C1000N0000001000: translating PT formula ReachabilityFireability into LoLA format
===========================================================================================
translating formula complete
touch formulae;
----- Start make result stderr -----
----- Start make result stdout -----
ReachabilityFireability @ GPPP-PT-C1000N0000001000 @ 3540 seconds
make: [verify] Error 134 (ignored)
----- Start make result stderr -----
Makefile:222: recipe for target 'verify' failed
----- Start make result stdout -----
lola: LoLA will run for 3540 seconds at most (--timelimit)
lola: NET
lola: reading net from model.pnml.lola
lola: finished parsing
lola: closed net file model.pnml.lola
lola: 55/65536 symbol table entries, 0 collisions
----- Kill lola and sara stderr -----
lola: preprocessing...
lola: finding significant places
lola: 33 places, 22 transitions, 21 significant places
lola: computing forward-conflicting sets
lola: computing back-conflicting sets
lola: 30 transition conflict sets
lola: TASK
lola: reading formula from GPPP-PT-C1000N0000001000-ReachabilityFireability.task
lola: E (F ((FIREABLE(remove) AND NOT FIREABLE(GAP_dehydrogenase)))) : E (F ((FIREABLE(Glutathione_oxidation) AND FIREABLE(generate) AND NOT FIREABLE(Phosphoclucose_isomerase)))) : E (F (FIREABLE(Enolase))) : E (F ((FIREABLE(generate) AND FIREABLE(Ru5P_isomerase) AND FIREABLE(Phosphoglycerate_mutase) AND FIREABLE(Ru5P_epimerase)))) : E (F (((FIREABLE(Hexokinase) OR FIREABLE(Enolase) OR FIREABLE(TIM_backward) OR (NOT FIREABLE(Phosphoclucose_isomerase) AND NOT FIREABLE(Ru5P_epimerase))) AND FIREABLE(Pyruvate_kinase)))) : E (F ((FIREABLE(Transketolase2) AND FIREABLE(TIM_forward) AND FIREABLE(Aldolase) AND (FIREABLE(TIM_forward) OR FIREABLE(Enolase) OR (FIREABLE(G6P_dehydrogenase) AND FIREABLE(Hexokinase))) AND (FIREABLE(Ru5P_isomerase) OR FIREABLE(Transaldolase))))) : A (G ((NOT FIREABLE(TIM_forward) OR NOT FIREABLE(generate) OR (NOT FIREABLE(remove) AND NOT FIREABLE(generate)) OR NOT FIREABLE(remove) OR NOT FIREABLE(GAP_dehydrogenase) OR NOT FIREABLE(Lactate_dehydrogenase)))) : E (F (())) : E (F (FIREABLE(Pyruvate_kinase))) : E (F (((FIREABLE(TIM_backward) OR FIREABLE(Transketolase2) OR NOT FIREABLE(G6P_dehydrogenase)) AND FIREABLE(TIM_backward) AND FIREABLE(Phosphoglycerate_mutase) AND FIREABLE(Hexokinase) AND NOT FIREABLE(remove) AND (FIREABLE(Transketolase2) OR FIREABLE(Lactate_dehydrogenase))))) : A (G ((FIREABLE(G6P_dehydrogenase) OR NOT FIREABLE(Phosphoclucose_isomerase) OR FIREABLE(Phosphofructokinase) OR FIREABLE(Glutathione_oxidation) OR NOT FIREABLE(generate) OR FIREABLE(Phosphoglycerate_kinase)))) : A (G ((NOT FIREABLE(Phosphoclucose_isomerase) OR NOT FIREABLE(Transketolase1) OR NOT FIREABLE(Ru5P_isomerase) OR ((NOT FIREABLE(Phosphofructokinase) OR NOT FIREABLE(Glutathione_reductose)) AND FIREABLE(generate))))) : A (G ((NOT FIREABLE(Ru5P_epimerase) OR NOT FIREABLE(Transaldolase) OR NOT FIREABLE(Transaldolase) OR NOT FIREABLE(Lactate_dehydrogenase) OR (FIREABLE(TIM_forward) AND FIREABLE(GAP_dehydrogenase) AND (FIREABLE(Enolase) OR FIREABLE(Transaldolase))) OR NOT FIREABLE(Phosphoglycerate_mutase)))) : A (G (NOT FIREABLE(Enolase))) : A (G (((NOT FIREABLE(Glutathione_oxidation) AND NOT FIREABLE(Phosphoglycerate_kinase)) OR FIREABLE(Glutathione_reductose) OR NOT FIREABLE(Glutathione_oxidation) OR NOT FIREABLE(Phosphofructokinase) OR (NOT FIREABLE(Phosphoclucose_isomerase) AND NOT FIREABLE(Glutathione_reductose))))) : E (F (FIREABLE(Pyruvate_kinase)))
lola: computing a collection of formulas
lola: RUNNING
lola: subprocess 0 will run for 221 seconds at most (--localtimelimit=-1)
lola: ========================================
lola: ...considering subproblem: E (F ((FIREABLE(remove) AND NOT FIREABLE(GAP_dehydrogenase))))
lola: ========================================
lola: SUBTASK
lola: checking reachability
lola: Planning: workflow for reachability check: stateequation||search (--findpath=off)
lola: STORE
lola: using a bit-perfect encoder (--encoder=bit)
lola: using 84 bytes per marking, with 0 unused bits
lola: using a prefix tree store (--store=prefix)
lola: SEARCH (state space)
lola: state space: using reachability graph (--search=depth)
lola: state space: using reachability preserving stubborn set method with insertion algorithm (--stubborn=tarjan)
lola: RUNNING
lola: state equation: Generated DNF with 12 literals and 4 conjunctive subformulas
lola: state equation: write sara problem file to GPPP-PT-C1000N0000001000-ReachabilityFireability.sara
lola: state equation: calling and running sara
sara: try reading problem file GPPP-PT-C1000N0000001000-ReachabilityFireability.sara.
sara: place or transition ordering is non-deterministic
lola: sara is running 0 secs || 4378512 markings, 8726970 edges, 875702 markings/sec, 0 secs
lola: sara is running 5 secs || 8965726 markings, 17901398 edges, 917443 markings/sec, 5 secs
lola: sara is running 10 secs || 14711125 markings, 27097598 edges, 1149080 markings/sec, 10 secs
lola: sara is running 15 secs || 20294417 markings, 36030864 edges, 1116658 markings/sec, 15 secs
lola: sara is running 20 secs || 25404231 markings, 44780425 edges, 1021963 markings/sec, 20 secs
lola: sara is running 25 secs || 29439834 markings, 52851631 edges, 807121 markings/sec, 25 secs
lola: sara is running 30 secs || 34169807 markings, 62304591 edges, 945995 markings/sec, 30 secs
lola: sara is running 35 secs || 38860776 markings, 71686528 edges, 938194 markings/sec, 35 secs
lola: sara is running 40 secs || 43505480 markings, 80975937 edges, 928941 markings/sec, 40 secs
lola: sara is running 45 secs || 48742139 markings, 89903874 edges, 1047332 markings/sec, 45 secs
lola: sara is running 50 secs || 54106699 markings, 98487170 edges, 1072912 markings/sec, 50 secs
lola: sara is running 55 secs || 59461841 markings, 107055397 edges, 1071028 markings/sec, 55 secs
lola: sara is running 60 secs || 64134796 markings, 115311040 edges, 934591 markings/sec, 60 secs
lola: sara is running 65 secs || 68559091 markings, 123243309 edges, 884859 markings/sec, 65 secs
lola: sara is running 70 secs || 72888235 markings, 131012127 edges, 865829 markings/sec, 70 secs
lola: sara is running 75 secs || 77119549 markings, 138597077 edges, 846263 markings/sec, 75 secs
lola: sara is running 80 secs || 81317856 markings, 146136080 edges, 839661 markings/sec, 80 secs
lola: sara is running 85 secs || 85514330 markings, 153660927 edges, 839295 markings/sec, 85 secs
lola: sara is running 90 secs || 89682326 markings, 161150032 edges, 833599 markings/sec, 90 secs
lola: sara is running 95 secs || 93795405 markings, 168537840 edges, 822616 markings/sec, 95 secs
lola: sara is running 100 secs || 97889815 markings, 175875888 edges, 818882 markings/sec, 100 secs
lola: sara is running 105 secs || 101995925 markings, 183264616 edges, 821222 markings/sec, 105 secs
lola: sara is running 110 secs || 106083214 markings, 190579407 edges, 817458 markings/sec, 110 secs
lola: sara is running 115 secs || 110161872 markings, 197899614 edges, 815732 markings/sec, 115 secs
lola: sara is running 120 secs || 114225247 markings, 205240992 edges, 812675 markings/sec, 120 secs
lola: sara is running 125 secs || 118316324 markings, 212605988 edges, 818215 markings/sec, 125 secs
lola: sara is running 130 secs || 122460690 markings, 220001820 edges, 828873 markings/sec, 130 secs
lola: sara is running 135 secs || 126551281 markings, 227387682 edges, 818118 markings/sec, 135 secs
lola: sara is running 140 secs || 130669660 markings, 234793847 edges, 823676 markings/sec, 140 secs
lola: sara is running 145 secs || 134782716 markings, 242163254 edges, 822611 markings/sec, 145 secs
lola: sara is running 150 secs || 138895391 markings, 249561454 edges, 822535 markings/sec, 150 secs
lola: sara is running 155 secs || 142984979 markings, 256947297 edges, 817918 markings/sec, 155 secs
lola: sara is running 160 secs || 147081367 markings, 264237296 edges, 819278 markings/sec, 160 secs
lola: sara is running 165 secs || 151162716 markings, 271609573 edges, 816270 markings/sec, 165 secs
lola: sara is running 170 secs || 155240659 markings, 278973568 edges, 815589 markings/sec, 170 secs
lola: sara is running 175 secs || 159376269 markings, 286325288 edges, 827122 markings/sec, 175 secs
lola: sara is running 180 secs || 163466222 markings, 293756691 edges, 817991 markings/sec, 180 secs
lola: sara is running 185 secs || 167582992 markings, 301119843 edges, 823354 markings/sec, 185 secs
lola: sara is running 190 secs || 171688015 markings, 308451872 edges, 821005 markings/sec, 190 secs
lola: sara is running 195 secs || 175359904 markings, 315066142 edges, 734378 markings/sec, 195 secs
lola: sara is running 200 secs || 175994850 markings, 316227666 edges, 126989 markings/sec, 200 secs
lola: Child process aborted or communication problem between parent and child process
terminate called after throwing an instance of 'std::runtime_error'
what(): parse error at position 0: unexpected character, last read: '!'
Aborted (core dumped)
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-0 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-1 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-2 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-3 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-4 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-5 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-6 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-7 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-8 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-9 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-10 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-11 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-12 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-13 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-14 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
FORMULA GPPP-PT-C1000N0000001000-ReachabilityFireability-15 CANNOT_COMPUTE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION STUBBORN_SETS TOPOLOGICAL USE_NUPN
----- Kill lola and sara stdout -----
----- Finished stdout -----
----- Finished stderr -----

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="GPPP-PT-C1000N0000001000"
export BK_EXAMINATION="ReachabilityFireability"
export BK_TOOL="mcc4mcc-structural"
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

tar xzf /home/mcc/BenchKit/INPUTS/GPPP-PT-C1000N0000001000.tgz
mv GPPP-PT-C1000N0000001000 execution
cd execution
pwd
ls -lh

# this is for BenchKit: explicit launching of the test
echo "====================================================================="
echo " Generated by BenchKit 2-3637"
echo " Executing tool mcc4mcc-structural"
echo " Input is GPPP-PT-C1000N0000001000, 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 r095-blw7-152650007300357"
echo "====================================================================="
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
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 ;