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.r128-tall-167814504600127.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2023-input.qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
..........................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-5348
Executing tool gold2022
Input is DBSingleClientW-PT-d0m07, examination is QuasiLiveness
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r128-tall-167814504600127
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 572K
-rw-r--r-- 1 mcc users 5.3K Feb 26 15:32 CTLCardinality.txt
-rw-r--r-- 1 mcc users 48K Feb 26 15:32 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.1K Feb 26 15:31 CTLFireability.txt
-rw-r--r-- 1 mcc users 45K Feb 26 15:31 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.4K Feb 25 15:48 LTLCardinality.txt
-rw-r--r-- 1 mcc users 20K Feb 25 15:48 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K Feb 25 15:48 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Feb 25 15:48 LTLFireability.xml
-rw-r--r-- 1 mcc users 13K Feb 26 15:33 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 140K Feb 26 15:33 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 11K Feb 26 15:32 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 103K Feb 26 15:32 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Feb 25 15:48 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.8K Feb 25 15:48 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 equiv_col
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 119K 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

FORMULA_NAME QuasiLiveness

=== Now, execution of the tool begins

BK_START 1678175227437

Running Version 202205111006
[2023-03-07 07:47:08] [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]
[2023-03-07 07:47:08] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-07 07:47:08] [INFO ] Load time of PNML (sax parser for PT used): 91 ms
[2023-03-07 07:47:08] [INFO ] Transformed 553 places.
[2023-03-07 07:47:08] [INFO ] Transformed 150 transitions.
[2023-03-07 07:47:08] [INFO ] Parsed PT model containing 553 places and 150 transitions in 210 ms.
Starting structural reductions in LIVENESS mode, iteration 0 : 553/553 places, 150/150 transitions.
Reduce places removed 451 places and 0 transitions.
Ensure Unique test removed 11 transitions
Reduce isomorphic transitions removed 11 transitions.
Iterating post reduction 0 with 462 rules applied. Total rules applied 462 place count 102 transition count 139
Discarding 24 places :
Symmetric choice reduction at 1 with 24 rule applications. Total rules 486 place count 78 transition count 96
Iterating global reduction 1 with 24 rules applied. Total rules applied 510 place count 78 transition count 96
Ensure Unique test removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Iterating post reduction 1 with 1 rules applied. Total rules applied 511 place count 78 transition count 95
Discarding 12 places :
Symmetric choice reduction at 2 with 12 rule applications. Total rules 523 place count 66 transition count 83
Iterating global reduction 2 with 12 rules applied. Total rules applied 535 place count 66 transition count 83
Ensure Unique test removed 2 transitions
Reduce isomorphic transitions removed 2 transitions.
Iterating post reduction 2 with 2 rules applied. Total rules applied 537 place count 66 transition count 81
Discarding 3 places :
Symmetric choice reduction at 3 with 3 rule applications. Total rules 540 place count 63 transition count 75
Iterating global reduction 3 with 3 rules applied. Total rules applied 543 place count 63 transition count 75
Ensure Unique test removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Iterating post reduction 3 with 1 rules applied. Total rules applied 544 place count 63 transition count 74
Discarding 2 places :
Symmetric choice reduction at 4 with 2 rule applications. Total rules 546 place count 61 transition count 71
Iterating global reduction 4 with 2 rules applied. Total rules applied 548 place count 61 transition count 71
Discarding 2 places :
Symmetric choice reduction at 4 with 2 rule applications. Total rules 550 place count 59 transition count 69
Iterating global reduction 4 with 2 rules applied. Total rules applied 552 place count 59 transition count 69
Ensure Unique test removed 2 transitions
Reduce isomorphic transitions removed 2 transitions.
Iterating post reduction 4 with 2 rules applied. Total rules applied 554 place count 59 transition count 67
Discarding 1 places :
Symmetric choice reduction at 5 with 1 rule applications. Total rules 555 place count 58 transition count 66
Iterating global reduction 5 with 1 rules applied. Total rules applied 556 place count 58 transition count 66
Ensure Unique test removed 2 transitions
Reduce isomorphic transitions removed 2 transitions.
Iterating post reduction 5 with 2 rules applied. Total rules applied 558 place count 58 transition count 64
Applied a total of 558 rules in 45 ms. Remains 58 /553 variables (removed 495) and now considering 64/150 (removed 86) transitions.
// Phase 1: matrix 64 rows 58 cols
[2023-03-07 07:47:08] [INFO ] Computed 2 place invariants in 10 ms
[2023-03-07 07:47:09] [INFO ] Implicit Places using invariants in 160 ms returned []
// Phase 1: matrix 64 rows 58 cols
[2023-03-07 07:47:09] [INFO ] Computed 2 place invariants in 6 ms
[2023-03-07 07:47:09] [INFO ] State equation strengthened by 20 read => feed constraints.
[2023-03-07 07:47:09] [INFO ] Implicit Places using invariants and state equation in 133 ms returned []
Implicit Place search using SMT with State Equation took 319 ms to find 0 implicit places.
// Phase 1: matrix 64 rows 58 cols
[2023-03-07 07:47:09] [INFO ] Computed 2 place invariants in 5 ms
[2023-03-07 07:47:09] [INFO ] Dead Transitions using invariants and state equation in 56 ms found 0 transitions.
Starting structural reductions in LIVENESS mode, iteration 1 : 58/553 places, 64/150 transitions.
Finished structural reductions, in 1 iterations. Remains : 58/553 places, 64/150 transitions.
Discarding 18 transitions out of 64. Remains 46
Initial state reduction rules removed 1 formulas.
Incomplete random walk after 10000 steps, including 2303 resets, run finished after 432 ms. (steps per millisecond=23 ) properties (out of 45) seen :18
Incomplete Best-First random walk after 1001 steps, including 57 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 27) seen :0
Incomplete Best-First random walk after 1000 steps, including 60 resets, run finished after 14 ms. (steps per millisecond=71 ) properties (out of 27) seen :0
Incomplete Best-First random walk after 1001 steps, including 52 resets, run finished after 14 ms. (steps per millisecond=71 ) properties (out of 27) seen :0
Incomplete Best-First random walk after 1001 steps, including 46 resets, run finished after 13 ms. (steps per millisecond=77 ) properties (out of 27) seen :1
Incomplete Best-First random walk after 1001 steps, including 50 resets, run finished after 15 ms. (steps per millisecond=66 ) properties (out of 26) seen :0
Incomplete Best-First random walk after 1001 steps, including 58 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 26) seen :0
Incomplete Best-First random walk after 1001 steps, including 59 resets, run finished after 11 ms. (steps per millisecond=91 ) properties (out of 26) seen :0
Incomplete Best-First random walk after 1001 steps, including 51 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 26) seen :0
Incomplete Best-First random walk after 1001 steps, including 44 resets, run finished after 15 ms. (steps per millisecond=66 ) properties (out of 26) seen :0
Incomplete Best-First random walk after 1001 steps, including 52 resets, run finished after 11 ms. (steps per millisecond=91 ) properties (out of 26) seen :2
Incomplete Best-First random walk after 1001 steps, including 48 resets, run finished after 10 ms. (steps per millisecond=100 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1000 steps, including 200 resets, run finished after 17 ms. (steps per millisecond=58 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1000 steps, including 101 resets, run finished after 13 ms. (steps per millisecond=76 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1001 steps, including 113 resets, run finished after 14 ms. (steps per millisecond=71 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1001 steps, including 111 resets, run finished after 13 ms. (steps per millisecond=77 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1000 steps, including 98 resets, run finished after 13 ms. (steps per millisecond=76 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1000 steps, including 113 resets, run finished after 15 ms. (steps per millisecond=66 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1001 steps, including 105 resets, run finished after 14 ms. (steps per millisecond=71 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1001 steps, including 111 resets, run finished after 14 ms. (steps per millisecond=71 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1000 steps, including 110 resets, run finished after 14 ms. (steps per millisecond=71 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1000 steps, including 99 resets, run finished after 21 ms. (steps per millisecond=47 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1001 steps, including 112 resets, run finished after 15 ms. (steps per millisecond=66 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1001 steps, including 87 resets, run finished after 12 ms. (steps per millisecond=83 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1000 steps, including 106 resets, run finished after 13 ms. (steps per millisecond=76 ) properties (out of 24) seen :0
Incomplete Best-First random walk after 1001 steps, including 108 resets, run finished after 13 ms. (steps per millisecond=77 ) properties (out of 24) seen :0
Running SMT prover for 24 properties.
// Phase 1: matrix 64 rows 58 cols
[2023-03-07 07:47:10] [INFO ] Computed 2 place invariants in 1 ms
[2023-03-07 07:47:10] [INFO ] [Real]Absence check using 1 positive place invariants in 1 ms returned sat
[2023-03-07 07:47:10] [INFO ] [Real]Absence check using 1 positive and 1 generalized place invariants in 0 ms returned sat
[2023-03-07 07:47:10] [INFO ] After 145ms SMT Verify possible using state equation in real domain returned unsat :0 sat :2 real:22
[2023-03-07 07:47:10] [INFO ] State equation strengthened by 20 read => feed constraints.
[2023-03-07 07:47:10] [INFO ] After 14ms SMT Verify possible using 20 Read/Feed constraints in real domain returned unsat :0 sat :0 real:24
[2023-03-07 07:47:10] [INFO ] After 281ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:24
[2023-03-07 07:47:10] [INFO ] [Nat]Absence check using 1 positive place invariants in 1 ms returned sat
[2023-03-07 07:47:10] [INFO ] [Nat]Absence check using 1 positive and 1 generalized place invariants in 1 ms returned sat
[2023-03-07 07:47:10] [INFO ] After 124ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :24
[2023-03-07 07:47:10] [INFO ] After 114ms SMT Verify possible using 20 Read/Feed constraints in natural domain returned unsat :0 sat :24
[2023-03-07 07:47:10] [INFO ] After 314ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :24
Attempting to minimize the solution found.
Minimization took 151 ms.
[2023-03-07 07:47:11] [INFO ] After 699ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :24
Parikh walk visited 3 properties in 432 ms.
Support contains 32 out of 58 places. Attempting structural reductions.
Starting structural reductions in SAFETY mode, iteration 0 : 58/58 places, 64/64 transitions.
Applied a total of 0 rules in 10 ms. Remains 58 /58 variables (removed 0) and now considering 64/64 (removed 0) transitions.
Finished structural reductions, in 1 iterations. Remains : 58/58 places, 64/64 transitions.
Incomplete random walk after 1000000 steps, including 229170 resets, run finished after 19372 ms. (steps per millisecond=51 ) properties (out of 21) seen :14
Incomplete Best-First random walk after 1000000 steps, including 50637 resets, run finished after 4962 ms. (steps per millisecond=201 ) properties (out of 7) seen :1
Interrupted Best-First random walk after 754163 steps, including 76754 resets, run timeout after 5001 ms. (steps per millisecond=150 ) properties seen 0
Interrupted Best-First random walk after 745947 steps, including 76215 resets, run timeout after 5001 ms. (steps per millisecond=149 ) properties seen 0
Interrupted Best-First random walk after 798885 steps, including 81479 resets, run timeout after 5001 ms. (steps per millisecond=159 ) properties seen 0
Interrupted Best-First random walk after 802147 steps, including 81803 resets, run timeout after 5001 ms. (steps per millisecond=160 ) properties seen 0
Incomplete Best-First random walk after 1000000 steps, including 102286 resets, run finished after 4483 ms. (steps per millisecond=223 ) properties (out of 6) seen :1
Running SMT prover for 5 properties.
// Phase 1: matrix 64 rows 58 cols
[2023-03-07 07:48:00] [INFO ] Computed 2 place invariants in 2 ms
[2023-03-07 07:48:00] [INFO ] [Real]Absence check using 1 positive place invariants in 0 ms returned sat
[2023-03-07 07:48:00] [INFO ] [Real]Absence check using 1 positive and 1 generalized place invariants in 0 ms returned sat
[2023-03-07 07:48:00] [INFO ] After 73ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:5
[2023-03-07 07:48:00] [INFO ] [Nat]Absence check using 1 positive place invariants in 0 ms returned sat
[2023-03-07 07:48:00] [INFO ] [Nat]Absence check using 1 positive and 1 generalized place invariants in 11 ms returned sat
[2023-03-07 07:48:00] [INFO ] After 30ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :5
[2023-03-07 07:48:00] [INFO ] State equation strengthened by 20 read => feed constraints.
[2023-03-07 07:48:00] [INFO ] After 25ms SMT Verify possible using 20 Read/Feed constraints in natural domain returned unsat :0 sat :5
[2023-03-07 07:48:00] [INFO ] After 60ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :5
Attempting to minimize the solution found.
Minimization took 35 ms.
[2023-03-07 07:48:00] [INFO ] After 166ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :5
Parikh walk visited 1 properties in 405 ms.
Support contains 8 out of 58 places. Attempting structural reductions.
Starting structural reductions in SAFETY mode, iteration 0 : 58/58 places, 64/64 transitions.
Graph (complete) has 170 edges and 58 vertex of which 57 are kept as prefixes of interest. Removing 1 places using SCC suffix rule.4 ms
Discarding 1 places :
Also discarding 0 output transitions
Drop transitions removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Iterating post reduction 0 with 1 rules applied. Total rules applied 2 place count 57 transition count 63
Applied a total of 2 rules in 11 ms. Remains 57 /58 variables (removed 1) and now considering 63/64 (removed 1) transitions.
Finished structural reductions, in 1 iterations. Remains : 57/58 places, 63/64 transitions.
Incomplete random walk after 1000000 steps, including 229465 resets, run finished after 10883 ms. (steps per millisecond=91 ) properties (out of 4) seen :0
Incomplete Best-First random walk after 1000001 steps, including 50572 resets, run finished after 2898 ms. (steps per millisecond=345 ) properties (out of 4) seen :0
Incomplete Best-First random walk after 1000001 steps, including 101825 resets, run finished after 4080 ms. (steps per millisecond=245 ) properties (out of 4) seen :0
Interrupted Best-First random walk after 970810 steps, including 99343 resets, run timeout after 5001 ms. (steps per millisecond=194 ) properties seen 0
Interrupted Best-First random walk after 888384 steps, including 90287 resets, run timeout after 5001 ms. (steps per millisecond=177 ) properties seen 0
Finished probabilistic random walk after 4241 steps, run visited all 4 properties in 48 ms. (steps per millisecond=88 )
Probabilistic random walk after 4241 steps, saw 1919 distinct states, run finished after 48 ms. (steps per millisecond=88 ) properties seen :4
Able to resolve query QuasiLiveness after proving 46 properties.
FORMULA QuasiLiveness TRUE TECHNIQUES RANDOM_WALK PARIKH_WALK PROBABILISTIC_WALK BESTFIRST_WALK TOPOLOGICAL INITIAL_STATE
Total runtime 80311 ms.

BK_STOP 1678175309020

--------------------
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="DBSingleClientW-PT-d0m07"
export BK_EXAMINATION="QuasiLiveness"
export BK_TOOL="gold2022"
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 2-5348"
echo " Executing tool gold2022"
echo " Input is DBSingleClientW-PT-d0m07, 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 r128-tall-167814504600127"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/DBSingleClientW-PT-d0m07.tgz
mv DBSingleClientW-PT-d0m07 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 ;