fond
Model Checking Contest 2024
14th edition, Geneva, Switzerland, June 25, 2024
Execution of r179-tall-171640602200711
Last Updated
July 7, 2024

About the Execution of GreatSPN+red for HealthRecord-PT-02

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
302.283 5676.00 13208.00 70.50 FTFFTFTTTTFFTTFT normal

Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2024-input.r179-tall-171640602200711.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2024-input.qcow2 backing_fmt=qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
..................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-5568
Executing tool greatspnxred
Input is HealthRecord-PT-02, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r179-tall-171640602200711
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 496K
-rw-r--r-- 1 mcc users 5.8K May 14 13:22 CTLCardinality.txt
-rw-r--r-- 1 mcc users 60K May 14 13:22 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.0K May 14 13:22 CTLFireability.txt
-rw-r--r-- 1 mcc users 55K May 14 13:22 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.3K Apr 22 14:47 LTLCardinality.txt
-rw-r--r-- 1 mcc users 23K Apr 22 14:47 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Apr 22 14:47 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Apr 22 14:47 LTLFireability.xml
-rw-r--r-- 1 mcc users 14K Apr 12 20:20 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 159K Apr 12 20:20 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 7.2K Apr 12 20:19 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 60K Apr 12 20:19 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Apr 22 14:47 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Apr 22 14:47 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 18 16:42 equiv_col
-rw-r--r-- 1 mcc users 3 May 18 16:42 instance
-rw-r--r-- 1 mcc users 6 May 18 16:42 iscolored
-rw-r--r-- 1 mcc users 47K May 18 16:42 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 HealthRecord-PT-02-ReachabilityFireability-2024-00
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-01
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-02
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-03
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-04
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-05
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-06
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-07
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-08
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-09
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-10
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-11
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-12
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-13
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-14
FORMULA_NAME HealthRecord-PT-02-ReachabilityFireability-2024-15

=== Now, execution of the tool begins

BK_START 1716490177161

Invoking MCC driver with
BK_TOOL=greatspnxred
BK_EXAMINATION=ReachabilityFireability
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=HealthRecord-PT-02
BK_MEMORY_CONFINEMENT=16384
Applying reductions before tool greatspn
Invoking reducer
Running Version 202405141337
[2024-05-23 18:49:38] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityFireability, -timeout, 360, -rebuildPNML]
[2024-05-23 18:49:38] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2024-05-23 18:49:38] [INFO ] Load time of PNML (sax parser for PT used): 64 ms
[2024-05-23 18:49:38] [INFO ] Transformed 119 places.
[2024-05-23 18:49:38] [INFO ] Transformed 225 transitions.
[2024-05-23 18:49:38] [INFO ] Found NUPN structural information;
[2024-05-23 18:49:38] [INFO ] Parsed PT model containing 119 places and 225 transitions and 577 arcs in 175 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityFireability.xml in 16 ms.
Working with output stream class java.io.PrintStream
Ensure Unique test removed 6 transitions
Reduce redundant transitions removed 6 transitions.
RANDOM walk for 40000 steps (2374 resets) in 2053 ms. (19 steps per ms) remains 8/16 properties
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-15 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-14 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-13 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-09 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-08 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-07 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-05 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-01 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
BEST_FIRST walk for 40003 steps (366 resets) in 130 ms. (305 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40004 steps (368 resets) in 173 ms. (229 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40004 steps (333 resets) in 214 ms. (186 steps per ms) remains 8/8 properties
BEST_FIRST walk for 40004 steps (363 resets) in 383 ms. (104 steps per ms) remains 7/8 properties
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-06 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
BEST_FIRST walk for 40004 steps (382 resets) in 135 ms. (294 steps per ms) remains 7/7 properties
BEST_FIRST walk for 40003 steps (371 resets) in 126 ms. (314 steps per ms) remains 6/7 properties
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-12 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
[2024-05-23 18:49:39] [INFO ] Flow matrix only has 211 transitions (discarded 8 similar events)
// Phase 1: matrix 211 rows 119 cols
[2024-05-23 18:49:39] [INFO ] Computed 14 invariants in 8 ms
[2024-05-23 18:49:39] [INFO ] State equation strengthened by 1 read => feed constraints.
All remaining problems are real, not stopping.
At refinement iteration 0 (INCLUDED_ONLY) 0/72 variables, 72/72 constraints. Problems are: Problem set: 0 solved, 6 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/72 variables, 0/72 constraints. Problems are: Problem set: 0 solved, 6 unsolved
Problem HealthRecord-PT-02-ReachabilityFireability-2024-02 is UNSAT
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-02 FALSE TECHNIQUES SMT_REFINEMENT
At refinement iteration 2 (OVERLAPS) 33/105 variables, 8/80 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/105 variables, 33/113 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/105 variables, 1/114 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 5 (INCLUDED_ONLY) 0/105 variables, 0/114 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 6 (OVERLAPS) 14/119 variables, 5/119 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/119 variables, 14/133 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 8 (INCLUDED_ONLY) 0/119 variables, 0/133 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 9 (OVERLAPS) 210/329 variables, 119/252 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 10 (INCLUDED_ONLY) 0/329 variables, 0/252 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 11 (OVERLAPS) 1/330 variables, 1/253 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 12 (INCLUDED_ONLY) 0/330 variables, 0/253 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 13 (OVERLAPS) 0/330 variables, 0/253 constraints. Problems are: Problem set: 1 solved, 5 unsolved
No progress, stopping.
After SMT solving in domain Real declared 330/330 variables, and 253 constraints, problems are : Problem set: 1 solved, 5 unsolved in 751 ms.
Refiners :[Domain max(s): 119/119 constraints, Positive P Invariants (semi-flows): 8/8 constraints, Generalized P Invariants (flows): 6/6 constraints, State Equation: 119/119 constraints, ReadFeed: 1/1 constraints, PredecessorRefiner: 6/6 constraints, Known Traps: 0/0 constraints]
Escalating to Integer solving :Problem set: 1 solved, 5 unsolved
At refinement iteration 0 (INCLUDED_ONLY) 0/70 variables, 70/70 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/70 variables, 0/70 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 2 (OVERLAPS) 34/104 variables, 8/78 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/104 variables, 34/112 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/104 variables, 1/113 constraints. Problems are: Problem set: 1 solved, 5 unsolved
[2024-05-23 18:49:40] [INFO ] Deduced a trap composed of 40 places in 67 ms of which 11 ms to minimize.
[2024-05-23 18:49:40] [INFO ] Deduced a trap composed of 39 places in 47 ms of which 2 ms to minimize.
[2024-05-23 18:49:40] [INFO ] Deduced a trap composed of 41 places in 35 ms of which 1 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 38 places in 44 ms of which 1 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 38 places in 46 ms of which 1 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 46 places in 40 ms of which 1 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 39 places in 42 ms of which 1 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 46 places in 46 ms of which 1 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 45 places in 43 ms of which 1 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 45 places in 164 ms of which 1 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 42 places in 52 ms of which 1 ms to minimize.
Problem HealthRecord-PT-02-ReachabilityFireability-2024-11 is UNSAT
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-11 FALSE TECHNIQUES SMT_REFINEMENT
At refinement iteration 5 (INCLUDED_ONLY) 0/104 variables, 11/124 constraints. Problems are: Problem set: 2 solved, 4 unsolved
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 37 places in 50 ms of which 3 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 40 places in 50 ms of which 9 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 22 places in 46 ms of which 0 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 40 places in 50 ms of which 2 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 40 places in 66 ms of which 1 ms to minimize.
[2024-05-23 18:49:41] [INFO ] Deduced a trap composed of 39 places in 58 ms of which 1 ms to minimize.
[2024-05-23 18:49:42] [INFO ] Deduced a trap composed of 38 places in 51 ms of which 3 ms to minimize.
[2024-05-23 18:49:42] [INFO ] Deduced a trap composed of 39 places in 61 ms of which 0 ms to minimize.
At refinement iteration 6 (INCLUDED_ONLY) 0/104 variables, 8/132 constraints. Problems are: Problem set: 2 solved, 4 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/104 variables, 0/132 constraints. Problems are: Problem set: 2 solved, 4 unsolved
Problem HealthRecord-PT-02-ReachabilityFireability-2024-04 is UNSAT
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-04 TRUE TECHNIQUES SMT_REFINEMENT
At refinement iteration 8 (OVERLAPS) 15/119 variables, 5/137 constraints. Problems are: Problem set: 3 solved, 3 unsolved
At refinement iteration 9 (INCLUDED_ONLY) 0/119 variables, 15/152 constraints. Problems are: Problem set: 3 solved, 3 unsolved
[2024-05-23 18:49:42] [INFO ] Deduced a trap composed of 34 places in 92 ms of which 1 ms to minimize.
[2024-05-23 18:49:42] [INFO ] Deduced a trap composed of 24 places in 45 ms of which 1 ms to minimize.
At refinement iteration 10 (INCLUDED_ONLY) 0/119 variables, 2/154 constraints. Problems are: Problem set: 3 solved, 3 unsolved
At refinement iteration 11 (INCLUDED_ONLY) 0/119 variables, 0/154 constraints. Problems are: Problem set: 3 solved, 3 unsolved
At refinement iteration 12 (OVERLAPS) 210/329 variables, 119/273 constraints. Problems are: Problem set: 3 solved, 3 unsolved
Problem HealthRecord-PT-02-ReachabilityFireability-2024-03 is UNSAT
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-03 FALSE TECHNIQUES SMT_REFINEMENT
At refinement iteration 13 (INCLUDED_ONLY) 0/329 variables, 3/276 constraints. Problems are: Problem set: 4 solved, 2 unsolved
At refinement iteration 14 (INCLUDED_ONLY) 0/329 variables, 0/276 constraints. Problems are: Problem set: 4 solved, 2 unsolved
At refinement iteration 15 (OVERLAPS) 1/330 variables, 1/277 constraints. Problems are: Problem set: 4 solved, 2 unsolved
[2024-05-23 18:49:42] [INFO ] Deduced a trap composed of 34 places in 57 ms of which 3 ms to minimize.
At refinement iteration 16 (INCLUDED_ONLY) 0/330 variables, 1/278 constraints. Problems are: Problem set: 4 solved, 2 unsolved
At refinement iteration 17 (INCLUDED_ONLY) 0/330 variables, 0/278 constraints. Problems are: Problem set: 4 solved, 2 unsolved
At refinement iteration 18 (OVERLAPS) 0/330 variables, 0/278 constraints. Problems are: Problem set: 4 solved, 2 unsolved
No progress, stopping.
After SMT solving in domain Int declared 330/330 variables, and 278 constraints, problems are : Problem set: 4 solved, 2 unsolved in 2055 ms.
Refiners :[Domain max(s): 119/119 constraints, Positive P Invariants (semi-flows): 8/8 constraints, Generalized P Invariants (flows): 6/6 constraints, State Equation: 119/119 constraints, ReadFeed: 1/1 constraints, PredecessorRefiner: 3/6 constraints, Known Traps: 22/22 constraints]
After SMT, in 2960ms problems are : Problem set: 4 solved, 2 unsolved
Finished Parikh walk after 47 steps, including 1 resets, run visited all 2 properties in 2 ms. (steps per millisecond=23 )
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-10 FALSE TECHNIQUES PARIKH_WALK
FORMULA HealthRecord-PT-02-ReachabilityFireability-2024-00 FALSE TECHNIQUES PARIKH_WALK
Finished Parikh walk after 0 steps, including 0 resets, run visited all 0 properties in 1 ms. (steps per millisecond=0 )
Parikh walk visited 2 properties in 12 ms.
All properties solved without resorting to model-checking.
Total runtime 4522 ms.
ITS solved all properties within timeout

BK_STOP 1716490182837

--------------------
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_1.0.0.202405141337.jar
+ VERSION=202405141337
+ echo 'Running Version 202405141337'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityFireability -timeout 360 -rebuildPNML

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="HealthRecord-PT-02"
export BK_EXAMINATION="ReachabilityFireability"
export BK_TOOL="greatspnxred"
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 2-5568"
echo " Executing tool greatspnxred"
echo " Input is HealthRecord-PT-02, 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 r179-tall-171640602200711"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/HealthRecord-PT-02.tgz
mv HealthRecord-PT-02 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 ;