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.r510-tall-167912734400240.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 Sudoku-PT-BN16, examination is ReachabilityFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r510-tall-167912734400240
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 104M
-rw-r--r-- 1 mcc users 1.3M Feb 26 09:34 CTLCardinality.txt
-rw-r--r-- 1 mcc users 5.7M Feb 26 09:34 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.5M Feb 26 08:50 CTLFireability.txt
-rw-r--r-- 1 mcc users 23M Feb 26 08:50 CTLFireability.xml
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 equiv_col
-rw-r--r-- 1 mcc users 4.2K Jan 29 11:41 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.6K Jan 29 11:41 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 5 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 473K Feb 25 17:17 LTLCardinality.txt
-rw-r--r-- 1 mcc users 1.6M Feb 25 17:17 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.4M Feb 25 17:17 LTLFireability.txt
-rw-r--r-- 1 mcc users 7.6M Feb 25 17:17 LTLFireability.xml
-rw-r--r-- 1 mcc users 2.7M Mar 5 18:23 model.pnml
-rw-r--r-- 1 mcc users 2.6M Feb 26 11:04 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 12M Feb 26 11:04 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 7.8M Feb 26 09:48 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 33M Feb 26 09:48 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 29K Feb 25 17:17 UpperBounds.txt
-rw-r--r-- 1 mcc users 73K Feb 25 17:17 UpperBounds.xml

--------------------
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 Sudoku-PT-BN16-ReachabilityFireability-00
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-01
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-02
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-03
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-04
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-05
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-06
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-07
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-08
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-09
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-10
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-11
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-12
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-13
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-14
FORMULA_NAME Sudoku-PT-BN16-ReachabilityFireability-15

=== Now, execution of the tool begins

BK_START 1679340446875

gold2022
Got BK_BIN_PATH=/home/mcc/BenchKit/bin/
---> gold2022 --- TAPAAL v5
Setting MODEL_PATH=.
Setting VERIFYPN=/home/mcc/BenchKit/bin/verifypn
Got BK_TIME_CONFINEMENT=3600
Setting TEMPDIR=/home/mcc/BenchKit/bin/tmp
Got BK_MEMORY_CONFINEMENT=16384
Limiting to 16265216 kB
Total timeout: 3590
Time left: 3590

**********************************************
* TAPAAL verifying ReachabilityFireability *
**********************************************
TEMPDIR=/home/mcc/BenchKit/bin/tmp
QF=/home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT
MF=/home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk
Time left: 3590
---------------------------------------------------
Step -1: Stripping Colors
---------------------------------------------------
Verifying stripped models (16 in total)
/home/mcc/BenchKit/bin/verifypn -n -c -q 718 -l 29 -d 299 -z 4 -x 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 ./model.pnml ./ReachabilityFireability.xml
CPN OverApproximation is only usable on colored models
Time left: 3590
---------------------------------------------------
Step 0: Parallel Simplification
---------------------------------------------------
Doing parallel simplification (16 in total)
Total simplification timout is 718 -- reduction timeout is 299
timeout 3590 /home/mcc/BenchKit/bin/verifypn -n -q 718 -l 29 -d 299 -z 4 -s OverApprox --binary-query-io 2 --write-simplified /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --write-reduced /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk -x 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 ./model.pnml ./ReachabilityFireability.xml

Time left: 2871

---------------------------------------------------
Step 1: Parallel processing
---------------------------------------------------
Doing parallel verification of individual queries (16 in total)
Each query is verified by 4 parallel strategies for 256 seconds
------------------- QUERY 1 ----------------------
Solution found by parallel processing (step 1)
Search strategy option was ignored as the TAR engine is called.
Query index 0 was solved

Query is NOT satisfied.


Solved using Trace Abstraction Refinement

Spent 0.000174 on verification
FORMULA Sudoku-PT-BN16-ReachabilityFireability-08 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Query index 0 was solved

Query is NOT satisfied.

Spent 0.000738 on verification
@@@0.64,111940@@@
@@@0.66,111936@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -tar\ -s\ RDFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 1 -n
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ BestFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 1 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-08 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 2870
------------------- QUERY 2 ----------------------
Solution found by parallel processing (step 1)
Search strategy option was ignored as the TAR engine is called.
Query index 0 was solved

Query is NOT satisfied.


Solved using Trace Abstraction Refinement

Spent 0.000147 on verification
@@@0.62,111900@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -tar\ -s\ RDFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 2 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-11 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 2869
------------------- QUERY 3 ----------------------
Solution found by parallel processing (step 1)
Search strategy option was ignored as the TAR engine is called.
Query index 0 was solved

Query is NOT satisfied.


Solved using Trace Abstraction Refinement

Spent 0.000149 on verification
@@@0.61,111840@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -tar\ -s\ RDFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 3 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-15 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 2868
------------------- QUERY 4 ----------------------
Solution found by parallel processing (step 1)
Search strategy option was ignored as the TAR engine is called.
Query index 0 was solved

Query is NOT satisfied.


Solved using Trace Abstraction Refinement

Spent 0.000371 on verification
@@@0.61,111848@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -tar\ -s\ RDFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 4 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-12 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 2867
------------------- QUERY 5 ----------------------
Solution found by parallel processing (step 1)
Search strategy option was ignored as the TAR engine is called.
Query index 0 was solved

Query is satisfied.


Solved using Trace Abstraction Refinement

Spent 0.001947 on verification
@@@0.63,112136@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -tar\ -s\ RDFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 5 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-13 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 2866
------------------- QUERY 6 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is satisfied.

Spent 0.019013 on verification
@@@0.68,112120@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ BestFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 6 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-09 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2866
------------------- QUERY 7 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is NOT satisfied.

Spent 0.025471 on verification
@@@0.63,112164@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ BestFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 7 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-10 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2865
------------------- QUERY 8 ----------------------
Solution found by parallel processing (step 1)
Search strategy option was ignored as the TAR engine is called.
Query index 0 was solved

Query is NOT satisfied.


Solved using Trace Abstraction Refinement

Spent 0.000816 on verification
@@@0.62,112080@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -tar\ -s\ RDFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 8 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-14 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 2864
------------------- QUERY 9 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is satisfied.

Spent 2.54454 on verification
@@@3.21,112924@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ DFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 9 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-01 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2860
------------------- QUERY 10 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is NOT satisfied.

Spent 4.57721 on verification
@@@6.05,112932@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ DFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 10 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-02 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2854
------------------- QUERY 11 ----------------------
No solution found



Time left: 2595
------------------- QUERY 12 ----------------------
No solution found



Time left: 2337
------------------- QUERY 13 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is NOT satisfied.

Spent 2.85296 on verification
@@@3.67,117416@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ DFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 13 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-05 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2333
------------------- QUERY 14 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is NOT satisfied.

Spent 2.72594 on verification
@@@3.68,138672@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ DFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 14 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-04 FALSE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2329
------------------- QUERY 15 ----------------------
No solution found



Time left: 2069
------------------- QUERY 16 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is satisfied.

Spent 7.62836 on verification
@@@10.16,155660@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -s\ DFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.CFZX0DXWBk /home/mcc/BenchKit/bin/tmp/tmp.UhzIDta0KT --binary-query-io 1 -x 16 -n

FORMULA Sudoku-PT-BN16-ReachabilityFireability-03 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 2059
---------------------------------------------------
Step 2: Sequential processing
---------------------------------------------------
Remaining 3 queries are verified sequentially.
Each query is verified for a dynamic timeout (at least 598 seconds)
Time left: 2059
------------------- QUERY 11 ----------------------
Running query 11 for 686 seconds. Remaining: 3 queries and 2059 seconds
No solution found



Time left: 1371
------------------- QUERY 12 ----------------------
Running query 12 for 685 seconds. Remaining: 2 queries and 1371 seconds
No solution found



Time left: 684
------------------- QUERY 15 ----------------------
Running query 15 for 684 seconds. Remaining: 1 queries and 684 seconds
No solution found



Time left: -3
Out of time, terminating!
terminated-with-cleanup

BK_STOP 1679344040939

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

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="Sudoku-PT-BN16"
export BK_EXAMINATION="ReachabilityFireability"
export BK_TOOL="gold2022"
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 2-5348"
echo " Executing tool gold2022"
echo " Input is Sudoku-PT-BN16, 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 r510-tall-167912734400240"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/Sudoku-PT-BN16.tgz
mv Sudoku-PT-BN16 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 ;