fond
Model Checking Contest 2024
14th edition, Geneva, Switzerland, June 25, 2024
Execution of r004-smll-171620118300326
Last Updated
July 7, 2024

About the Execution of ITS-Tools for Anderson-PT-05

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
371.479 7961.00 22804.00 275.00 TFFTFFTTTTFFFTTT 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.r004-smll-171620118300326.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)
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=====================================================================
Generated by BenchKit 2-5568
Executing tool itstools
Input is Anderson-PT-05, examination is ReachabilityCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r004-smll-171620118300326
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 712K
-rw-r--r-- 1 mcc users 6.0K 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 8.1K May 14 13:22 CTLFireability.txt
-rw-r--r-- 1 mcc users 63K May 14 13:22 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.7K Apr 22 14:27 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K Apr 22 14:27 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.8K Apr 22 14:27 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Apr 22 14:27 LTLFireability.xml
-rw-r--r-- 1 mcc users 16K Apr 12 15:36 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 162K Apr 12 15:36 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 16K Apr 12 15:35 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 108K Apr 12 15:35 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Apr 22 14:27 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Apr 22 14:27 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 185K 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 Anderson-PT-05-ReachabilityCardinality-2024-00
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-01
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-02
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-03
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-04
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-05
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-06
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-07
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-08
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-09
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-10
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-11
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-12
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-13
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-14
FORMULA_NAME Anderson-PT-05-ReachabilityCardinality-2024-15

=== Now, execution of the tool begins

BK_START 1716424066165

Invoking MCC driver with
BK_TOOL=itstools
BK_EXAMINATION=ReachabilityCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=Anderson-PT-05
BK_MEMORY_CONFINEMENT=16384
Not applying reductions.
Model is PT
ReachabilityCardinality PT
Running Version 202405141337
[2024-05-23 00:27:48] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, ReachabilityCardinality, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2024-05-23 00:27:48] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2024-05-23 00:27:49] [INFO ] Load time of PNML (sax parser for PT used): 205 ms
[2024-05-23 00:27:49] [INFO ] Transformed 161 places.
[2024-05-23 00:27:49] [INFO ] Transformed 365 transitions.
[2024-05-23 00:27:49] [INFO ] Found NUPN structural information;
[2024-05-23 00:27:49] [INFO ] Parsed PT model containing 161 places and 365 transitions and 1380 arcs in 484 ms.
Parsed 16 properties from file /home/mcc/execution/ReachabilityCardinality.xml in 56 ms.
Working with output stream class java.io.PrintStream
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-05 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-09 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-10 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-15 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
[2024-05-23 00:27:50] [INFO ] Flatten gal took : 357 ms
[2024-05-23 00:27:50] [INFO ] Flatten gal took : 135 ms
RANDOM walk for 40000 steps (8 resets) in 3378 ms. (11 steps per ms) remains 6/12 properties
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-12 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-07 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-06 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-04 FALSE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-03 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-00 TRUE TECHNIQUES TOPOLOGICAL RANDOM_WALK
[2024-05-23 00:27:51] [INFO ] Time to serialize gal into /tmp/ReachabilityCardinality14218016264239859352.gal : 107 ms
[2024-05-23 00:27:51] [INFO ] Time to serialize properties into /tmp/ReachabilityCardinality17549621353369036915.prop : 5 ms
Invoking ITS tools like this :cd /home/mcc/execution;'/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202405141337/bin/its-reach-linux64' '--gc-threshold' '2000000' '--quiet' '-i' '/tmp/ReachabilityCardinality14218016264239859352.gal' '-t' 'CGAL' '-reachable-file' '/tmp/ReachabilityCardinality17549621353369036915.prop' '--nowitness' '--gen-order' 'FOLLOW'

its-reach command run as :

/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.move.gal.itstools.binaries_1.0.0.202405141337/bin/its-reach-linux64 --gc-threshold 2000000 --quiet ...330
Loading property file /tmp/ReachabilityCardinality17549621353369036915.prop.
BEST_FIRST walk for 40002 steps (8 resets) in 1077 ms. (37 steps per ms) remains 6/6 properties
SDD proceeding with computation,6 properties remain. new max is 4
SDD size :1 after 3
SDD proceeding with computation,6 properties remain. new max is 8
SDD size :3 after 10
SDD proceeding with computation,6 properties remain. new max is 16
SDD size :10 after 12
SDD proceeding with computation,6 properties remain. new max is 32
SDD size :12 after 19
SDD proceeding with computation,6 properties remain. new max is 64
SDD size :19 after 58
SDD proceeding with computation,6 properties remain. new max is 128
SDD size :58 after 325
SDD proceeding with computation,6 properties remain. new max is 256
SDD size :325 after 3160
BEST_FIRST walk for 40002 steps (8 resets) in 541 ms. (73 steps per ms) remains 6/6 properties
BEST_FIRST walk for 40004 steps (8 resets) in 293 ms. (136 steps per ms) remains 6/6 properties
SDD proceeding with computation,6 properties remain. new max is 512
SDD size :3160 after 5197
SDD proceeding with computation,6 properties remain. new max is 1024
SDD size :5197 after 5893
BEST_FIRST walk for 40002 steps (8 resets) in 207 ms. (192 steps per ms) remains 6/6 properties
BEST_FIRST walk for 40003 steps (8 resets) in 617 ms. (64 steps per ms) remains 6/6 properties
BEST_FIRST walk for 40004 steps (8 resets) in 632 ms. (63 steps per ms) remains 6/6 properties
// Phase 1: matrix 365 rows 161 cols
[2024-05-23 00:27:52] [INFO ] Computed 13 invariants in 35 ms
[2024-05-23 00:27:52] [INFO ] State equation strengthened by 20 read => feed constraints.
Problem Anderson-PT-05-ReachabilityCardinality-2024-02 is UNSAT
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-02 FALSE TECHNIQUES SMT_REFINEMENT
All remaining problems are real, not stopping.
At refinement iteration 0 (INCLUDED_ONLY) 0/84 variables, 84/84 constraints. Problems are: Problem set: 1 solved, 5 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/84 variables, 0/84 constraints. Problems are: Problem set: 1 solved, 5 unsolved
Problem Anderson-PT-05-ReachabilityCardinality-2024-11 is UNSAT
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-11 FALSE TECHNIQUES SMT_REFINEMENT
At refinement iteration 2 (OVERLAPS) 72/156 variables, 6/90 constraints. Problems are: Problem set: 2 solved, 4 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/156 variables, 72/162 constraints. Problems are: Problem set: 2 solved, 4 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/156 variables, 0/162 constraints. Problems are: Problem set: 2 solved, 4 unsolved
Problem Anderson-PT-05-ReachabilityCardinality-2024-01 is UNSAT
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-01 FALSE TECHNIQUES SMT_REFINEMENT
At refinement iteration 5 (OVERLAPS) 5/161 variables, 7/169 constraints. Problems are: Problem set: 3 solved, 3 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/161 variables, 5/174 constraints. Problems are: Problem set: 3 solved, 3 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/161 variables, 0/174 constraints. Problems are: Problem set: 3 solved, 3 unsolved
At refinement iteration 8 (OVERLAPS) 365/526 variables, 161/335 constraints. Problems are: Problem set: 3 solved, 3 unsolved
At refinement iteration 9 (INCLUDED_ONLY) 0/526 variables, 20/355 constraints. Problems are: Problem set: 3 solved, 3 unsolved
At refinement iteration 10 (INCLUDED_ONLY) 0/526 variables, 0/355 constraints. Problems are: Problem set: 3 solved, 3 unsolved
At refinement iteration 11 (OVERLAPS) 0/526 variables, 0/355 constraints. Problems are: Problem set: 3 solved, 3 unsolved
No progress, stopping.
After SMT solving in domain Real declared 526/526 variables, and 355 constraints, problems are : Problem set: 3 solved, 3 unsolved in 821 ms.
Refiners :[Domain max(s): 161/161 constraints, Positive P Invariants (semi-flows): 6/6 constraints, Generalized P Invariants (flows): 7/7 constraints, State Equation: 161/161 constraints, ReadFeed: 20/20 constraints, PredecessorRefiner: 6/6 constraints, Known Traps: 0/0 constraints]
Escalating to Integer solving :Problem set: 3 solved, 3 unsolved
At refinement iteration 0 (INCLUDED_ONLY) 0/65 variables, 65/65 constraints. Problems are: Problem set: 3 solved, 3 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/65 variables, 0/65 constraints. Problems are: Problem set: 3 solved, 3 unsolved
Problem Anderson-PT-05-ReachabilityCardinality-2024-13 is UNSAT
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-13 TRUE TECHNIQUES SMT_REFINEMENT
At refinement iteration 2 (OVERLAPS) 89/154 variables, 6/71 constraints. Problems are: Problem set: 4 solved, 2 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/154 variables, 89/160 constraints. Problems are: Problem set: 4 solved, 2 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/154 variables, 0/160 constraints. Problems are: Problem set: 4 solved, 2 unsolved
Problem Anderson-PT-05-ReachabilityCardinality-2024-14 is UNSAT
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-14 TRUE TECHNIQUES SMT_REFINEMENT
At refinement iteration 5 (OVERLAPS) 7/161 variables, 7/167 constraints. Problems are: Problem set: 5 solved, 1 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/161 variables, 7/174 constraints. Problems are: Problem set: 5 solved, 1 unsolved
At refinement iteration 7 (INCLUDED_ONLY) 0/161 variables, 0/174 constraints. Problems are: Problem set: 5 solved, 1 unsolved
At refinement iteration 8 (OVERLAPS) 365/526 variables, 161/335 constraints. Problems are: Problem set: 5 solved, 1 unsolved
At refinement iteration 9 (INCLUDED_ONLY) 0/526 variables, 20/355 constraints. Problems are: Problem set: 5 solved, 1 unsolved
At refinement iteration 10 (INCLUDED_ONLY) 0/526 variables, 1/356 constraints. Problems are: Problem set: 5 solved, 1 unsolved
At refinement iteration 11 (INCLUDED_ONLY) 0/526 variables, 0/356 constraints. Problems are: Problem set: 5 solved, 1 unsolved
At refinement iteration 12 (OVERLAPS) 0/526 variables, 0/356 constraints. Problems are: Problem set: 5 solved, 1 unsolved
No progress, stopping.
After SMT solving in domain Int declared 526/526 variables, and 356 constraints, problems are : Problem set: 5 solved, 1 unsolved in 533 ms.
Refiners :[Domain max(s): 161/161 constraints, Positive P Invariants (semi-flows): 6/6 constraints, Generalized P Invariants (flows): 7/7 constraints, State Equation: 161/161 constraints, ReadFeed: 20/20 constraints, PredecessorRefiner: 1/6 constraints, Known Traps: 0/0 constraints]
After SMT, in 1591ms problems are : Problem set: 5 solved, 1 unsolved
Parikh walk visited 0 properties in 16 ms.
Support contains 18 out of 161 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 161/161 places, 365/365 transitions.
Performed 16 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
SDD proceeding with computation,6 properties remain. new max is 2048
Pre-agglomeration after 0 with 16 Pre rules applied. Total rules applied 0 place count 161 transition count 349
Deduced a syphon composed of 16 places in 2 ms
Reduce places removed 16 places and 0 transitions.
Iterating global reduction 0 with 32 rules applied. Total rules applied 32 place count 145 transition count 349
SDD size :5893 after 22280
Discarding 35 places :
Symmetric choice reduction at 0 with 35 rule applications. Total rules 67 place count 110 transition count 170
Iterating global reduction 0 with 35 rules applied. Total rules applied 102 place count 110 transition count 170
Performed 3 Post agglomeration using F-continuation condition.Transition count delta: 3
Deduced a syphon composed of 3 places in 1 ms
Reduce places removed 3 places and 0 transitions.
Iterating global reduction 0 with 6 rules applied. Total rules applied 108 place count 107 transition count 167
Applied a total of 108 rules in 99 ms. Remains 107 /161 variables (removed 54) and now considering 167/365 (removed 198) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 115 ms. Remains : 107/161 places, 167/365 transitions.
RANDOM walk for 40000 steps (8 resets) in 248 ms. (160 steps per ms) remains 1/1 properties
BEST_FIRST walk for 40003 steps (8 resets) in 145 ms. (273 steps per ms) remains 1/1 properties
Finished probabilistic random walk after 5760 steps, run visited all 1 properties in 39 ms. (steps per millisecond=147 )
Probabilistic random walk after 5760 steps, saw 3513 distinct states, run finished after 45 ms. (steps per millisecond=128 ) properties seen :1
FORMULA Anderson-PT-05-ReachabilityCardinality-2024-08 TRUE TECHNIQUES TOPOLOGICAL PROBABILISTIC_WALK
ITS runner timed out or was interrupted.
ITS tools runner thread asked to quit. Dying gracefully.
All properties solved without resorting to model-checking.
Total runtime 5301 ms.

BK_STOP 1716424074126

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

+ export BINDIR=/home/mcc/BenchKit/bin//../itstools/bin//../
+ BINDIR=/home/mcc/BenchKit/bin//../itstools/bin//../
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ ReachabilityCardinality = StateSpace ]]
+ /home/mcc/BenchKit/bin//../itstools/bin//..//runeclipse.sh /home/mcc/execution ReachabilityCardinality -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600
+ 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//../itstools/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202405141337.jar
+ VERSION=202405141337
+ echo 'Running Version 202405141337'
+ /home/mcc/BenchKit/bin//../itstools/bin//..//itstools/its-tools -pnfolder /home/mcc/execution -examination ReachabilityCardinality -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//../itstools/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600

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="Anderson-PT-05"
export BK_EXAMINATION="ReachabilityCardinality"
export BK_TOOL="itstools"
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 itstools"
echo " Input is Anderson-PT-05, 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 r004-smll-171620118300326"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/Anderson-PT-05.tgz
mv Anderson-PT-05 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 ;