fond
Model Checking Contest 2023
13th edition, Paris, France, April 26, 2023 (at TOOLympics II)
Execution of r010-oct2-167813599400687
Last Updated
May 14, 2023

About the Execution of Marcie+red for AutonomousCar-PT-10b

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
7212.384 3600000.00 3662158.00 3640.20 TTTFTTTTFTFFFFFT normal

Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2023-input.r010-oct2-167813599400687.qcow2', fmt=qcow2 cluster_size=65536 extended_l2=off compression_type=zlib size=4294967296 backing_file=/data/fkordon/mcc2023-input.qcow2 backing_fmt=qcow2 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
.....................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-5348
Executing tool marciexred
Input is AutonomousCar-PT-10b, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r010-oct2-167813599400687
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 2.0M
-rw-r--r-- 1 mcc users 6.8K Feb 25 12:52 CTLCardinality.txt
-rw-r--r-- 1 mcc users 70K Feb 25 12:52 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.4K Feb 25 12:52 CTLFireability.txt
-rw-r--r-- 1 mcc users 48K Feb 25 12:52 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.8K Feb 25 15:34 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K Feb 25 15:34 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Feb 25 15:34 LTLFireability.txt
-rw-r--r-- 1 mcc users 16K Feb 25 15:34 LTLFireability.xml
-rw-r--r-- 1 mcc users 11K Feb 25 12:54 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 117K Feb 25 12:54 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 7.4K Feb 25 12:53 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 59K Feb 25 12:53 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Feb 25 15:34 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Feb 25 15:34 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 equiv_col
-rw-r--r-- 1 mcc users 4 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 1.6M Mar 5 18:22 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 AutonomousCar-PT-10b-ReachabilityFireability-00
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-01
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-02
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-03
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-04
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-05
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-06
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-07
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-08
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-09
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-10
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-11
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-12
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-13
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-14
FORMULA_NAME AutonomousCar-PT-10b-ReachabilityFireability-15

=== Now, execution of the tool begins

BK_START 1678704755905

bash -c /home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n "BK_STOP " ; date -u +%s%3N
Invoking MCC driver with
BK_TOOL=marciexred
BK_EXAMINATION=ReachabilityFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=AutonomousCar-PT-10b
Applying reductions before tool marcie
Invoking reducer
Running Version 202303021504
[2023-03-13 10:52:38] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -timeout, 360, -rebuildPNML]
[2023-03-13 10:52:38] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-13 10:52:38] [INFO ] Load time of PNML (sax parser for PT used): 198 ms
[2023-03-13 10:52:38] [INFO ] Transformed 425 places.
[2023-03-13 10:52:38] [INFO ] Transformed 2252 transitions.
[2023-03-13 10:52:38] [INFO ] Found NUPN structural information;
[2023-03-13 10:52:38] [INFO ] Parsed PT model containing 425 places and 2252 transitions and 29816 arcs in 292 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 9 ms.
Working with output stream class java.io.PrintStream
Incomplete random walk after 10000 steps, including 77 resets, run finished after 588 ms. (steps per millisecond=17 ) properties (out of 16) seen :3
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-14 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-06 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-02 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
Incomplete Best-First random walk after 10001 steps, including 11 resets, run finished after 112 ms. (steps per millisecond=89 ) properties (out of 13) seen :1
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-01 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
Incomplete Best-First random walk after 10001 steps, including 10 resets, run finished after 59 ms. (steps per millisecond=169 ) properties (out of 12) seen :0
Incomplete Best-First random walk after 10000 steps, including 9 resets, run finished after 69 ms. (steps per millisecond=144 ) properties (out of 12) seen :0
Incomplete Best-First random walk after 10001 steps, including 16 resets, run finished after 84 ms. (steps per millisecond=119 ) properties (out of 12) seen :0
Incomplete Best-First random walk after 10001 steps, including 13 resets, run finished after 97 ms. (steps per millisecond=103 ) properties (out of 12) seen :1
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-07 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
Incomplete Best-First random walk after 10000 steps, including 11 resets, run finished after 64 ms. (steps per millisecond=156 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10001 steps, including 9 resets, run finished after 98 ms. (steps per millisecond=102 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10001 steps, including 10 resets, run finished after 121 ms. (steps per millisecond=82 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10000 steps, including 10 resets, run finished after 71 ms. (steps per millisecond=140 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10000 steps, including 9 resets, run finished after 68 ms. (steps per millisecond=147 ) properties (out of 11) seen :0
Incomplete Best-First random walk after 10000 steps, including 12 resets, run finished after 66 ms. (steps per millisecond=151 ) properties (out of 11) seen :1
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-13 FALSE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
Incomplete Best-First random walk after 10001 steps, including 10 resets, run finished after 47 ms. (steps per millisecond=212 ) properties (out of 10) seen :0
Running SMT prover for 10 properties.
// Phase 1: matrix 2252 rows 425 cols
[2023-03-13 10:52:40] [INFO ] Computed 15 place invariants in 26 ms
[2023-03-13 10:52:41] [INFO ] After 586ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:10
[2023-03-13 10:52:41] [INFO ] [Nat]Absence check using 15 positive place invariants in 14 ms returned sat
[2023-03-13 10:52:43] [INFO ] After 1168ms SMT Verify possible using state equation in natural domain returned unsat :5 sat :5
[2023-03-13 10:52:44] [INFO ] Deduced a trap composed of 35 places in 786 ms of which 6 ms to minimize.
[2023-03-13 10:52:44] [INFO ] Trap strengthening procedure managed to obtain unsat after adding 1 trap constraints in 882 ms
[2023-03-13 10:52:45] [INFO ] Deduced a trap composed of 35 places in 727 ms of which 1 ms to minimize.
[2023-03-13 10:52:45] [INFO ] Trap strengthening procedure managed to obtain unsat after adding 1 trap constraints in 789 ms
[2023-03-13 10:52:45] [INFO ] Deduced a trap composed of 22 places in 264 ms of which 1 ms to minimize.
[2023-03-13 10:52:45] [INFO ] Trap strengthening (SAT) tested/added 2/1 trap constraints in 371 ms
[2023-03-13 10:52:46] [INFO ] Deduced a trap composed of 16 places in 617 ms of which 1 ms to minimize.
[2023-03-13 10:52:46] [INFO ] Trap strengthening (SAT) tested/added 2/1 trap constraints in 756 ms
[2023-03-13 10:52:46] [INFO ] After 4293ms SMT Verify possible using trap constraints in natural domain returned unsat :7 sat :3
Attempting to minimize the solution found.
Minimization took 186 ms.
[2023-03-13 10:52:46] [INFO ] After 4820ms SMT Verify possible using all constraints in natural domain returned unsat :7 sat :3
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-11 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-10 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-09 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-08 FALSE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-05 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-04 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-00 TRUE TECHNIQUES STRUCTURAL_REDUCTION TOPOLOGICAL SAT_SMT
Fused 10 Parikh solutions to 3 different solutions.
Parikh walk visited 0 properties in 78 ms.
Support contains 42 out of 425 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 425/425 places, 2252/2252 transitions.
Graph (trivial) has 316 edges and 425 vertex of which 4 / 425 are part of one of the 2 SCC in 17 ms
Free SCC test removed 2 places
Drop transitions removed 4 transitions
Reduce isomorphic transitions removed 4 transitions.
Graph (complete) has 1994 edges and 423 vertex of which 416 are kept as prefixes of interest. Removing 7 places using SCC suffix rule.27 ms
Discarding 7 places :
Also discarding 5 output transitions
Drop transitions removed 5 transitions
Drop transitions removed 2 transitions
Reduce isomorphic transitions removed 2 transitions.
Drop transitions removed 157 transitions
Trivial Post-agglo rules discarded 157 transitions
Performed 157 trivial Post agglomeration. Transition count delta: 157
Iterating post reduction 0 with 159 rules applied. Total rules applied 161 place count 416 transition count 2084
Reduce places removed 157 places and 0 transitions.
Ensure Unique test removed 22 transitions
Reduce isomorphic transitions removed 22 transitions.
Drop transitions removed 29 transitions
Trivial Post-agglo rules discarded 29 transitions
Performed 29 trivial Post agglomeration. Transition count delta: 29
Iterating post reduction 1 with 208 rules applied. Total rules applied 369 place count 259 transition count 2033
Reduce places removed 29 places and 0 transitions.
Performed 4 Post agglomeration using F-continuation condition.Transition count delta: 4
Iterating post reduction 2 with 33 rules applied. Total rules applied 402 place count 230 transition count 2029
Reduce places removed 4 places and 0 transitions.
Ensure Unique test removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Performed 1 Post agglomeration using F-continuation condition.Transition count delta: 1
Iterating post reduction 3 with 6 rules applied. Total rules applied 408 place count 226 transition count 2027
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 4 with 1 rules applied. Total rules applied 409 place count 225 transition count 2027
Performed 30 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 5 with 30 Pre rules applied. Total rules applied 409 place count 225 transition count 1997
Deduced a syphon composed of 30 places in 4 ms
Reduce places removed 30 places and 0 transitions.
Iterating global reduction 5 with 60 rules applied. Total rules applied 469 place count 195 transition count 1997
Discarding 37 places :
Symmetric choice reduction at 5 with 37 rule applications. Total rules 506 place count 158 transition count 1960
Iterating global reduction 5 with 37 rules applied. Total rules applied 543 place count 158 transition count 1960
Ensure Unique test removed 401 transitions
Reduce isomorphic transitions removed 401 transitions.
Iterating post reduction 5 with 401 rules applied. Total rules applied 944 place count 158 transition count 1559
Discarding 7 places :
Symmetric choice reduction at 6 with 7 rule applications. Total rules 951 place count 151 transition count 1498
Iterating global reduction 6 with 7 rules applied. Total rules applied 958 place count 151 transition count 1498
Ensure Unique test removed 6 transitions
Reduce isomorphic transitions removed 6 transitions.
Drop transitions removed 5 transitions
Trivial Post-agglo rules discarded 5 transitions
Performed 5 trivial Post agglomeration. Transition count delta: 5
Iterating post reduction 6 with 11 rules applied. Total rules applied 969 place count 151 transition count 1487
Reduce places removed 5 places and 0 transitions.
Iterating post reduction 7 with 5 rules applied. Total rules applied 974 place count 146 transition count 1487
Performed 28 Post agglomeration using F-continuation condition.Transition count delta: 28
Deduced a syphon composed of 28 places in 1 ms
Reduce places removed 28 places and 0 transitions.
Iterating global reduction 8 with 56 rules applied. Total rules applied 1030 place count 118 transition count 1459
Free-agglomeration rule applied 20 times.
Iterating global reduction 8 with 20 rules applied. Total rules applied 1050 place count 118 transition count 1439
Reduce places removed 20 places and 0 transitions.
Iterating post reduction 8 with 20 rules applied. Total rules applied 1070 place count 98 transition count 1439
Drop transitions removed 1 transitions
Redundant transition composition rules discarded 1 transitions
Iterating global reduction 9 with 1 rules applied. Total rules applied 1071 place count 98 transition count 1438
Partial Free-agglomeration rule applied 10 times.
Drop transitions removed 10 transitions
Iterating global reduction 9 with 10 rules applied. Total rules applied 1081 place count 98 transition count 1438
Discarding 1 places :
Symmetric choice reduction at 9 with 1 rule applications. Total rules 1082 place count 97 transition count 1427
Iterating global reduction 9 with 1 rules applied. Total rules applied 1083 place count 97 transition count 1427
Reduce places removed 1 places and 1 transitions.
Iterating global reduction 9 with 1 rules applied. Total rules applied 1084 place count 96 transition count 1426
Applied a total of 1084 rules in 685 ms. Remains 96 /425 variables (removed 329) and now considering 1426/2252 (removed 826) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 686 ms. Remains : 96/425 places, 1426/2252 transitions.
Finished random walk after 5844 steps, including 170 resets, run visited all 3 properties in 98 ms. (steps per millisecond=59 )
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-15 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-12 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-10b-ReachabilityFireability-03 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
All properties solved without resorting to model-checking.
Total runtime 9206 ms.
timeout --kill-after=10s --signal=SIGINT 1m for testing only

Marcie built on Linux at 2019-11-18.
A model checker for Generalized Stochastic Petri nets

authors: Alex Tovchigrechko (IDD package and CTL model checking)

Martin Schwarick (Symbolic numerical analysis and CSL model checking)

Christian Rohr (Simulative and approximative numerical model checking)

marcie@informatik.tu-cottbus.de

called as: /home/mcc/BenchKit/bin//../reducer/bin//../../marcie/bin/marcie --net-file=model.pnml --mcc-file=ReachabilityFireability.xml --memory=6 --mcc-mode

parse successfull
net created successfully

Net: AutonomousCar_PT_10b
(NrP: 425 NrTr: 2252 NrArc: 29816)

parse formulas
formulas created successfully
place and transition orderings generation:0m 0.388sec

net check time: 0m 0.002sec

init dd package: 0m 2.793sec

TIME LIMIT: Killed by timeout after 3600 seconds
MemTotal: 16393236 kB
MemFree: 8934996 kB
After kill :
MemTotal: 16393236 kB
MemFree: 16095984 kB

BK_TIME_CONFINEMENT_REACHED

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

+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
+ export PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ export LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
+ LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityFireability -timeout 360 -rebuildPNML
check for maximal unmarked siphon
ok
check for constant places
ok
check if there are places and transitions
ok
check if there are transitions without pre-places
ok
check if at least one transition is enabled in m0
ok
check if there are transitions that can never fire
ok


initing FirstDep: 0m 0.013sec

3496991 3497041 3500265 3500248 3500811 3500817 3534939

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="AutonomousCar-PT-10b"
export BK_EXAMINATION="ReachabilityFireability"
export BK_TOOL="marciexred"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="3600"
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 2-5348"
echo " Executing tool marciexred"
echo " Input is AutonomousCar-PT-10b, 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 r010-oct2-167813599400687"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/AutonomousCar-PT-10b.tgz
mv AutonomousCar-PT-10b execution
cd execution
if [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "UpperBounds" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] || [ "ReachabilityFireability" = "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 [ "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
elif [ "ReachabilityFireability" = "ReachabilityDeadlock" ] || [ "ReachabilityFireability" = "QuasiLiveness" ] || [ "ReachabilityFireability" = "StableMarking" ] || [ "ReachabilityFireability" = "Liveness" ] || [ "ReachabilityFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityFireability"
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 ;