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.r025-smll-171620166200230.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 AutonomousCar-PT-01b, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r025-smll-171620166200230
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 492K
-rw-r--r-- 1 mcc users 7.1K May 14 13:22 CTLCardinality.txt
-rw-r--r-- 1 mcc users 78K May 14 13:22 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.7K May 14 13:22 CTLFireability.txt
-rw-r--r-- 1 mcc users 54K May 14 13:22 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.4K Apr 22 14:28 LTLCardinality.txt
-rw-r--r-- 1 mcc users 25K Apr 22 14:28 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K Apr 22 14:28 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Apr 22 14:28 LTLFireability.xml
-rw-r--r-- 1 mcc users 15K Apr 12 18:04 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 165K Apr 12 18:04 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 5.4K Apr 12 18:03 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 40K Apr 12 18:03 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Apr 22 14:28 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Apr 22 14:28 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 18 16:42 equiv_col
-rw-r--r-- 1 mcc users 4 May 18 16:42 instance
-rw-r--r-- 1 mcc users 6 May 18 16:42 iscolored
-rw-r--r-- 1 mcc users 31K 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 AutonomousCar-PT-01b-ReachabilityCardinality-2024-00
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-01
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-02
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-03
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-04
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-05
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-06
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-07
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-08
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-09
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-10
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-11
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-12
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-13
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-14
FORMULA_NAME AutonomousCar-PT-01b-ReachabilityCardinality-2024-15

=== Now, execution of the tool begins

BK_START 1716343155195

Invoking MCC driver with
BK_TOOL=greatspnxred
BK_EXAMINATION=ReachabilityCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=AutonomousCar-PT-01b
BK_MEMORY_CONFINEMENT=16384
Applying reductions before tool greatspn
Invoking reducer
Running Version 202405141337
[2024-05-22 01:59:17] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -timeout, 360, -rebuildPNML]
[2024-05-22 01:59:17] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2024-05-22 01:59:17] [INFO ] Load time of PNML (sax parser for PT used): 94 ms
[2024-05-22 01:59:17] [INFO ] Transformed 119 places.
[2024-05-22 01:59:17] [INFO ] Transformed 132 transitions.
[2024-05-22 01:59:17] [INFO ] Found NUPN structural information;
[2024-05-22 01:59:17] [INFO ] Parsed PT model containing 119 places and 132 transitions and 339 arcs in 284 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 129 ms.
Working with output stream class java.io.PrintStream
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-03 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-04 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
RANDOM walk for 40000 steps (13 resets) in 2276 ms. (17 steps per ms) remains 5/14 properties
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-15 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-11 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-10 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-08 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-07 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-06 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-05 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-02 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-00 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
BEST_FIRST walk for 40000 steps (23 resets) in 796 ms. (50 steps per ms) remains 5/5 properties
BEST_FIRST walk for 40003 steps (16 resets) in 399 ms. (100 steps per ms) remains 5/5 properties
BEST_FIRST walk for 40000 steps (19 resets) in 223 ms. (178 steps per ms) remains 4/5 properties
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-12 FALSE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
BEST_FIRST walk for 40000 steps (10 resets) in 218 ms. (182 steps per ms) remains 4/4 properties
BEST_FIRST walk for 40000 steps (13 resets) in 180 ms. (220 steps per ms) remains 3/4 properties
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-14 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
// Phase 1: matrix 132 rows 119 cols
[2024-05-22 01:59:19] [INFO ] Computed 6 invariants in 18 ms
Problem AutonomousCar-PT-01b-ReachabilityCardinality-2024-13 is UNSAT
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-13 FALSE TECHNIQUES SMT_REFINEMENT
All remaining problems are real, not stopping.
At refinement iteration 0 (INCLUDED_ONLY) 0/55 variables, 55/55 constraints. Problems are: Problem set: 1 solved, 2 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/55 variables, 0/55 constraints. Problems are: Problem set: 1 solved, 2 unsolved
At refinement iteration 2 (OVERLAPS) 64/119 variables, 6/61 constraints. Problems are: Problem set: 1 solved, 2 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/119 variables, 64/125 constraints. Problems are: Problem set: 1 solved, 2 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/119 variables, 0/125 constraints. Problems are: Problem set: 1 solved, 2 unsolved
At refinement iteration 5 (OVERLAPS) 132/251 variables, 119/244 constraints. Problems are: Problem set: 1 solved, 2 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/251 variables, 0/244 constraints. Problems are: Problem set: 1 solved, 2 unsolved
At refinement iteration 7 (OVERLAPS) 0/251 variables, 0/244 constraints. Problems are: Problem set: 1 solved, 2 unsolved
No progress, stopping.
After SMT solving in domain Real declared 251/251 variables, and 244 constraints, problems are : Problem set: 1 solved, 2 unsolved in 580 ms.
Refiners :[Domain max(s): 119/119 constraints, Positive P Invariants (semi-flows): 6/6 constraints, State Equation: 119/119 constraints, PredecessorRefiner: 3/3 constraints, Known Traps: 0/0 constraints]
Escalating to Integer solving :Problem set: 1 solved, 2 unsolved
At refinement iteration 0 (INCLUDED_ONLY) 0/38 variables, 38/38 constraints. Problems are: Problem set: 1 solved, 2 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/38 variables, 0/38 constraints. Problems are: Problem set: 1 solved, 2 unsolved
At refinement iteration 2 (OVERLAPS) 81/119 variables, 6/44 constraints. Problems are: Problem set: 1 solved, 2 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/119 variables, 81/125 constraints. Problems are: Problem set: 1 solved, 2 unsolved
[2024-05-22 01:59:20] [INFO ] Deduced a trap composed of 18 places in 169 ms of which 21 ms to minimize.
[2024-05-22 01:59:20] [INFO ] Deduced a trap composed of 14 places in 227 ms of which 2 ms to minimize.
[2024-05-22 01:59:20] [INFO ] Deduced a trap composed of 16 places in 65 ms of which 1 ms to minimize.
Problem AutonomousCar-PT-01b-ReachabilityCardinality-2024-01 is UNSAT
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-01 TRUE TECHNIQUES SMT_REFINEMENT
[2024-05-22 01:59:20] [INFO ] Deduced a trap composed of 30 places in 71 ms of which 2 ms to minimize.
At refinement iteration 4 (INCLUDED_ONLY) 0/119 variables, 4/129 constraints. Problems are: Problem set: 2 solved, 1 unsolved
At refinement iteration 5 (INCLUDED_ONLY) 0/119 variables, 0/129 constraints. Problems are: Problem set: 2 solved, 1 unsolved
At refinement iteration 6 (OVERLAPS) 132/251 variables, 119/248 constraints. Problems are: Problem set: 2 solved, 1 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/251 variables, 1/249 constraints. Problems are: Problem set: 2 solved, 1 unsolved
At refinement iteration 8 (INCLUDED_ONLY) 0/251 variables, 0/249 constraints. Problems are: Problem set: 2 solved, 1 unsolved
At refinement iteration 9 (OVERLAPS) 0/251 variables, 0/249 constraints. Problems are: Problem set: 2 solved, 1 unsolved
No progress, stopping.
After SMT solving in domain Int declared 251/251 variables, and 249 constraints, problems are : Problem set: 2 solved, 1 unsolved in 963 ms.
Refiners :[Domain max(s): 119/119 constraints, Positive P Invariants (semi-flows): 6/6 constraints, State Equation: 119/119 constraints, PredecessorRefiner: 1/3 constraints, Known Traps: 4/4 constraints]
After SMT, in 1690ms problems are : Problem set: 2 solved, 1 unsolved
Parikh walk visited 0 properties in 22 ms.
Support contains 17 out of 119 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 119/119 places, 132/132 transitions.
Graph (trivial) has 81 edges and 119 vertex of which 4 / 119 are part of one of the 2 SCC in 4 ms
Free SCC test removed 2 places
Drop transitions (Empty/Sink Transition effects.) removed 4 transitions
Reduce isomorphic transitions removed 4 transitions.
Graph (complete) has 203 edges and 117 vertex of which 110 are kept as prefixes of interest. Removing 7 places using SCC suffix rule.2 ms
Discarding 7 places :
Also discarding 5 output transitions
Drop transitions (Output transitions of discarded places.) removed 5 transitions
Drop transitions (Empty/Sink Transition effects.) removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Drop transitions (Trivial Post-Agglo cleanup.) removed 27 transitions
Trivial Post-agglo rules discarded 27 transitions
Performed 27 trivial Post agglomeration. Transition count delta: 27
Iterating post reduction 0 with 28 rules applied. Total rules applied 30 place count 110 transition count 95
Reduce places removed 27 places and 0 transitions.
Ensure Unique test removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Performed 8 Post agglomeration using F-continuation condition.Transition count delta: 8
Iterating post reduction 1 with 36 rules applied. Total rules applied 66 place count 83 transition count 86
Reduce places removed 8 places and 0 transitions.
Ensure Unique test removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Iterating post reduction 2 with 9 rules applied. Total rules applied 75 place count 75 transition count 85
Performed 9 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 3 with 9 Pre rules applied. Total rules applied 75 place count 75 transition count 76
Deduced a syphon composed of 9 places in 0 ms
Reduce places removed 9 places and 0 transitions.
Iterating global reduction 3 with 18 rules applied. Total rules applied 93 place count 66 transition count 76
Discarding 8 places :
Symmetric choice reduction at 3 with 8 rule applications. Total rules 101 place count 58 transition count 68
Iterating global reduction 3 with 8 rules applied. Total rules applied 109 place count 58 transition count 68
Ensure Unique test removed 5 transitions
Reduce isomorphic transitions removed 5 transitions.
Performed 1 Post agglomeration using F-continuation condition.Transition count delta: 1
Iterating post reduction 3 with 6 rules applied. Total rules applied 115 place count 58 transition count 62
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 4 with 1 rules applied. Total rules applied 116 place count 57 transition count 62
Performed 1 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 5 with 1 Pre rules applied. Total rules applied 116 place count 57 transition count 61
Deduced a syphon composed of 1 places in 0 ms
Reduce places removed 1 places and 0 transitions.
Iterating global reduction 5 with 2 rules applied. Total rules applied 118 place count 56 transition count 61
Discarding 1 places :
Symmetric choice reduction at 5 with 1 rule applications. Total rules 119 place count 55 transition count 60
Iterating global reduction 5 with 1 rules applied. Total rules applied 120 place count 55 transition count 60
Performed 8 Post agglomeration using F-continuation condition.Transition count delta: 8
Deduced a syphon composed of 8 places in 0 ms
Reduce places removed 8 places and 0 transitions.
Iterating global reduction 5 with 16 rules applied. Total rules applied 136 place count 47 transition count 52
Discarding 1 places :
Symmetric choice reduction at 5 with 1 rule applications. Total rules 137 place count 46 transition count 50
Iterating global reduction 5 with 1 rules applied. Total rules applied 138 place count 46 transition count 50
Performed 1 Post agglomeration using F-continuation condition.Transition count delta: 0
Deduced a syphon composed of 1 places in 1 ms
Reduce places removed 1 places and 0 transitions.
Iterating global reduction 5 with 2 rules applied. Total rules applied 140 place count 45 transition count 50
Drop transitions (Redundant composition of simpler transitions.) removed 3 transitions
Redundant transition composition rules discarded 3 transitions
Iterating global reduction 5 with 3 rules applied. Total rules applied 143 place count 45 transition count 47
Free-agglomeration rule applied 1 times.
Iterating global reduction 5 with 1 rules applied. Total rules applied 144 place count 45 transition count 46
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 5 with 1 rules applied. Total rules applied 145 place count 44 transition count 46
Partial Free-agglomeration rule applied 3 times.
Drop transitions (Partial Free agglomeration) removed 3 transitions
Iterating global reduction 6 with 3 rules applied. Total rules applied 148 place count 44 transition count 46
Reduce places removed 1 places and 1 transitions.
Iterating global reduction 6 with 1 rules applied. Total rules applied 149 place count 43 transition count 45
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 6 with 1 rules applied. Total rules applied 150 place count 42 transition count 45
Applied a total of 150 rules in 127 ms. Remains 42 /119 variables (removed 77) and now considering 45/132 (removed 87) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 149 ms. Remains : 42/119 places, 45/132 transitions.
RANDOM walk for 40000 steps (1178 resets) in 342 ms. (116 steps per ms) remains 1/1 properties
BEST_FIRST walk for 14876 steps (151 resets) in 57 ms. (256 steps per ms) remains 0/1 properties
FORMULA AutonomousCar-PT-01b-ReachabilityCardinality-2024-09 TRUE TECHNIQUES TOPOLOGICAL BESTFIRST_WALK
All properties solved without resorting to model-checking.
Total runtime 4113 ms.
ITS solved all properties within timeout

BK_STOP 1716343161245

--------------------
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 ReachabilityCardinality -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="AutonomousCar-PT-01b"
export BK_EXAMINATION="ReachabilityCardinality"
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 AutonomousCar-PT-01b, examination is ReachabilityCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r025-smll-171620166200230"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/AutonomousCar-PT-01b.tgz
mv AutonomousCar-PT-01b execution
cd execution
if [ "ReachabilityCardinality" = "ReachabilityDeadlock" ] || [ "ReachabilityCardinality" = "UpperBounds" ] || [ "ReachabilityCardinality" = "QuasiLiveness" ] || [ "ReachabilityCardinality" = "StableMarking" ] || [ "ReachabilityCardinality" = "Liveness" ] || [ "ReachabilityCardinality" = "OneSafe" ] || [ "ReachabilityCardinality" = "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 [ "ReachabilityCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "ReachabilityCardinality" != "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 "ReachabilityCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property ReachabilityCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "ReachabilityCardinality.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 '' ReachabilityCardinality.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "ReachabilityCardinality" = "ReachabilityDeadlock" ] || [ "ReachabilityCardinality" = "QuasiLiveness" ] || [ "ReachabilityCardinality" = "StableMarking" ] || [ "ReachabilityCardinality" = "Liveness" ] || [ "ReachabilityCardinality" = "OneSafe" ] ; then
echo "FORMULA_NAME ReachabilityCardinality"
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 ;