Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2022-input.r229-tall-165286033900177.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2022-input.qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
.............................................................................
=====================================================================
Generated by BenchKit 2-4028
Executing tool itstools
Input is ShieldIIPt-PT-020B, examination is QuasiLiveness
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r229-tall-165286033900177
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 612K
-rw-r--r-- 1 mcc users 8.7K Apr 29 18:28 CTLCardinality.txt
-rw-r--r-- 1 mcc users 105K Apr 29 18:28 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.1K Apr 29 18:27 CTLFireability.txt
-rw-r--r-- 1 mcc users 57K Apr 29 18:27 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 10 09:34 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 3.7K May 9 08:50 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K May 9 08:50 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K May 9 08:50 LTLFireability.txt
-rw-r--r-- 1 mcc users 19K May 9 08:50 LTLFireability.xml
-rw-r--r-- 1 mcc users 1.6K May 9 08:50 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K May 9 08:50 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 10 09:34 equiv_col
-rw-r--r-- 1 mcc users 5 May 10 09:34 instance
-rw-r--r-- 1 mcc users 6 May 10 09:34 iscolored
-rw-r--r-- 1 mcc users 338K May 10 09:34 model.pnml

--------------------
content from stdout:

=== Data for post analysis generated by BenchKit (invocation template)

The expected result is a vector of booleans
BOOL_VECTOR

FORMULA_NAME QuasiLiveness

=== Now, execution of the tool begins

BK_START 1653032605963

Running Version 202205111006
[2022-05-20 07:43:27] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, QuasiLiveness, -spotpath, /home/mcc/BenchKit/bin//..//ltlfilt, -z3path, /home/mcc/BenchKit/bin//..//z3/bin/z3, -yices2path, /home/mcc/BenchKit/bin//..//yices/bin/yices, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 1800]
[2022-05-20 07:43:27] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2022-05-20 07:43:27] [INFO ] Load time of PNML (sax parser for PT used): 142 ms
[2022-05-20 07:43:27] [INFO ] Transformed 1403 places.
[2022-05-20 07:43:27] [INFO ] Transformed 1303 transitions.
[2022-05-20 07:43:27] [INFO ] Found NUPN structural information;
[2022-05-20 07:43:27] [INFO ] Parsed PT model containing 1403 places and 1303 transitions in 276 ms.
Starting structural reductions in LIVENESS mode, iteration 0 : 1403/1403 places, 1303/1303 transitions.
Drop transitions removed 342 transitions
Trivial Post-agglo rules discarded 342 transitions
Performed 342 trivial Post agglomeration. Transition count delta: 342
Iterating post reduction 0 with 342 rules applied. Total rules applied 342 place count 1403 transition count 961
Reduce places removed 342 places and 0 transitions.
Ensure Unique test removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Drop transitions removed 1 transitions
Trivial Post-agglo rules discarded 1 transitions
Performed 1 trivial Post agglomeration. Transition count delta: 1
Iterating post reduction 1 with 344 rules applied. Total rules applied 686 place count 1061 transition count 959
Reduce places removed 1 places and 0 transitions.
Iterating post reduction 2 with 1 rules applied. Total rules applied 687 place count 1060 transition count 959
Performed 81 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 3 with 81 Pre rules applied. Total rules applied 687 place count 1060 transition count 878
Deduced a syphon composed of 81 places in 11 ms
Reduce places removed 81 places and 0 transitions.
Iterating global reduction 3 with 162 rules applied. Total rules applied 849 place count 979 transition count 878
Discarding 140 places :
Symmetric choice reduction at 3 with 140 rule applications. Total rules 989 place count 839 transition count 738
Iterating global reduction 3 with 140 rules applied. Total rules applied 1129 place count 839 transition count 738
Performed 60 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 3 with 60 Pre rules applied. Total rules applied 1129 place count 839 transition count 678
Deduced a syphon composed of 60 places in 3 ms
Reduce places removed 60 places and 0 transitions.
Iterating global reduction 3 with 120 rules applied. Total rules applied 1249 place count 779 transition count 678
Performed 339 Post agglomeration using F-continuation condition.Transition count delta: 339
Deduced a syphon composed of 339 places in 1 ms
Reduce places removed 339 places and 0 transitions.
Iterating global reduction 3 with 678 rules applied. Total rules applied 1927 place count 440 transition count 339
Renaming transitions due to excessive name length > 1024 char.
Performed 59 Post agglomeration using F-continuation condition.Transition count delta: -39
Deduced a syphon composed of 59 places in 1 ms
Reduce places removed 59 places and 0 transitions.
Iterating global reduction 3 with 118 rules applied. Total rules applied 2045 place count 381 transition count 378
Applied a total of 2045 rules in 294 ms. Remains 381 /1403 variables (removed 1022) and now considering 378/1303 (removed 925) transitions.
// Phase 1: matrix 378 rows 381 cols
[2022-05-20 07:43:27] [INFO ] Computed 181 place invariants in 21 ms
[2022-05-20 07:43:28] [INFO ] Implicit Places using invariants in 404 ms returned [373, 374]
Discarding 2 places :
Implicit Place search using SMT only with invariants took 436 ms to find 2 implicit places.
Starting structural reductions in LIVENESS mode, iteration 1 : 379/1403 places, 378/1303 transitions.
Performed 1 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 0 with 1 Pre rules applied. Total rules applied 0 place count 379 transition count 377
Deduced a syphon composed of 1 places in 1 ms
Reduce places removed 1 places and 0 transitions.
Iterating global reduction 0 with 2 rules applied. Total rules applied 2 place count 378 transition count 377
Applied a total of 2 rules in 14 ms. Remains 378 /379 variables (removed 1) and now considering 377/378 (removed 1) transitions.
// Phase 1: matrix 377 rows 378 cols
[2022-05-20 07:43:28] [INFO ] Computed 179 place invariants in 13 ms
[2022-05-20 07:43:28] [INFO ] Implicit Places using invariants in 220 ms returned [367]
Discarding 1 places :
Implicit Place search using SMT only with invariants took 222 ms to find 1 implicit places.
Starting structural reductions in LIVENESS mode, iteration 2 : 377/1403 places, 377/1303 transitions.
Performed 1 Post agglomeration using F-continuation condition.Transition count delta: 1
Deduced a syphon composed of 1 places in 1 ms
Reduce places removed 1 places and 0 transitions.
Iterating global reduction 0 with 2 rules applied. Total rules applied 2 place count 376 transition count 376
Applied a total of 2 rules in 16 ms. Remains 376 /377 variables (removed 1) and now considering 376/377 (removed 1) transitions.
// Phase 1: matrix 376 rows 376 cols
[2022-05-20 07:43:28] [INFO ] Computed 178 place invariants in 2 ms
[2022-05-20 07:43:28] [INFO ] Implicit Places using invariants in 205 ms returned []
// Phase 1: matrix 376 rows 376 cols
[2022-05-20 07:43:28] [INFO ] Computed 178 place invariants in 2 ms
[2022-05-20 07:43:28] [INFO ] State equation strengthened by 177 read => feed constraints.
[2022-05-20 07:43:29] [INFO ] Implicit Places using invariants and state equation in 915 ms returned []
Implicit Place search using SMT with State Equation took 1123 ms to find 0 implicit places.
Starting structural reductions in LIVENESS mode, iteration 3 : 376/1403 places, 376/1303 transitions.
Finished structural reductions, in 3 iterations. Remains : 376/1403 places, 376/1303 transitions.
Discarding 177 transitions out of 376. Remains 199
Initial state reduction rules removed 1 formulas.
Incomplete random walk after 10000 steps, including 2 resets, run finished after 775 ms. (steps per millisecond=12 ) properties (out of 198) seen :139
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 7 ms. (steps per millisecond=143 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 14 ms. (steps per millisecond=71 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 7 ms. (steps per millisecond=143 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1000 steps, including 2 resets, run finished after 7 ms. (steps per millisecond=142 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1000 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 11 ms. (steps per millisecond=91 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 7 ms. (steps per millisecond=143 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 7 ms. (steps per millisecond=143 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 7 ms. (steps per millisecond=143 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 7 ms. (steps per millisecond=143 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 7 ms. (steps per millisecond=143 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1000 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1000 steps, including 2 resets, run finished after 7 ms. (steps per millisecond=142 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 7 ms. (steps per millisecond=143 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 8 ms. (steps per millisecond=125 ) properties (out of 59) seen :0
Incomplete Best-First random walk after 1001 steps, including 2 resets, run finished after 9 ms. (steps per millisecond=111 ) properties (out of 59) seen :0
Running SMT prover for 59 properties.
// Phase 1: matrix 376 rows 376 cols
[2022-05-20 07:43:30] [INFO ] Computed 178 place invariants in 1 ms
[2022-05-20 07:43:31] [INFO ] [Real]Absence check using 178 positive place invariants in 24 ms returned sat
[2022-05-20 07:43:33] [INFO ] After 1919ms SMT Verify possible using state equation in real domain returned unsat :0 sat :3 real:56
[2022-05-20 07:43:33] [INFO ] State equation strengthened by 177 read => feed constraints.
[2022-05-20 07:43:33] [INFO ] After 127ms SMT Verify possible using 177 Read/Feed constraints in real domain returned unsat :0 sat :0 real:59
[2022-05-20 07:43:33] [INFO ] After 2877ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:59
[2022-05-20 07:43:34] [INFO ] [Nat]Absence check using 178 positive place invariants in 31 ms returned sat
[2022-05-20 07:43:36] [INFO ] After 1992ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :59
[2022-05-20 07:43:58] [INFO ] After 22212ms SMT Verify possible using 177 Read/Feed constraints in natural domain returned unsat :0 sat :58
[2022-05-20 07:43:58] [INFO ] After 22214ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :58
Attempting to minimize the solution found.
Minimization took 1 ms.
[2022-05-20 07:43:58] [INFO ] After 25021ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :58
Finished Parikh walk after 830 steps, including 1 resets, run visited all 2 properties in 10 ms. (steps per millisecond=83 )
Parikh walk visited 59 properties in 413 ms.
Able to resolve query QuasiLiveness after proving 199 properties.
FORMULA QuasiLiveness TRUE TECHNIQUES RANDOM_WALK PARIKH_WALK TOPOLOGICAL INITIAL_STATE
Total runtime 31966 ms.

BK_STOP 1653032639167

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

+ export LANG=C
+ LANG=C
+ export BINDIR=/home/mcc/BenchKit/bin//../
+ BINDIR=/home/mcc/BenchKit/bin//../
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ QuasiLiveness = StateSpace ]]
+ /home/mcc/BenchKit/bin//..//runeclipse.sh /home/mcc/execution QuasiLiveness -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//..//greatspn/ -order META -manyOrder -smt -timeout 1800
+ ulimit -s 65536
+ export PYTHONPATH=/usr/lib/python3.9/site-packages/
+ PYTHONPATH=/usr/lib/python3.9/site-packages/
+ export LD_LIBRARY_PATH=/usr/local/lib:
+ LD_LIBRARY_PATH=/usr/local/lib:
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202205111006.jar
+ VERSION=202205111006
+ echo 'Running Version 202205111006'
+ /home/mcc/BenchKit/bin//..//itstools/its-tools -data @none -pnfolder /home/mcc/execution -examination QuasiLiveness -spotpath /home/mcc/BenchKit/bin//..//ltlfilt -z3path /home/mcc/BenchKit/bin//..//z3/bin/z3 -yices2path /home/mcc/BenchKit/bin//..//yices/bin/yices -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//..//greatspn/ -order META -manyOrder -smt -timeout 1800 -vmargs -Dosgi.locking=none -Declipse.stateSaveDelayInterval=-1 -Dosgi.configuration.area=@none -Xss128m -Xms40m -Xmx8192m

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="ShieldIIPt-PT-020B"
export BK_EXAMINATION="QuasiLiveness"
export BK_TOOL="itstools"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="1800"
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 2-4028"
echo " Executing tool itstools"
echo " Input is ShieldIIPt-PT-020B, examination is QuasiLiveness"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r229-tall-165286033900177"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/ShieldIIPt-PT-020B.tgz
mv ShieldIIPt-PT-020B execution
cd execution
if [ "QuasiLiveness" = "ReachabilityDeadlock" ] || [ "QuasiLiveness" = "UpperBounds" ] || [ "QuasiLiveness" = "QuasiLiveness" ] || [ "QuasiLiveness" = "StableMarking" ] || [ "QuasiLiveness" = "Liveness" ] || [ "QuasiLiveness" = "OneSafe" ] || [ "QuasiLiveness" = "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 [ "QuasiLiveness" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "QuasiLiveness" != "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 "QuasiLiveness.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property QuasiLiveness.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "QuasiLiveness.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 '' QuasiLiveness.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "QuasiLiveness" = "ReachabilityDeadlock" ] || [ "QuasiLiveness" = "QuasiLiveness" ] || [ "QuasiLiveness" = "StableMarking" ] || [ "QuasiLiveness" = "Liveness" ] || [ "QuasiLiveness" = "OneSafe" ] ; then
echo "FORMULA_NAME QuasiLiveness"
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 ;