About the Execution of Tapaal for BridgeAndVehicles-PT-V50P50N10
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.r021-tall-165251913900253.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 tapaal
Input is BridgeAndVehicles-PT-V50P50N10, examination is UpperBounds
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r021-tall-165251913900253
=====================================================================
--------------------
preparation of the directory to be used:
/home/mcc/execution
total 2.7M
-rw-r--r-- 1 mcc users 23K Apr 29 23:37 CTLCardinality.txt
-rw-r--r-- 1 mcc users 133K Apr 29 23:37 CTLCardinality.xml
-rw-r--r-- 1 mcc users 184K Apr 29 23:33 CTLFireability.txt
-rw-r--r-- 1 mcc users 745K Apr 29 23:33 CTLFireability.xml
-rw-r--r-- 1 mcc users 5 May 10 09:33 equiv_col
-rw-r--r-- 1 mcc users 4.2K May 10 09:33 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 10 May 10 09:33 instance
-rw-r--r-- 1 mcc users 6 May 10 09:33 iscolored
-rw-r--r-- 1 mcc users 12K May 9 07:07 LTLCardinality.txt
-rw-r--r-- 1 mcc users 51K May 9 07:07 LTLCardinality.xml
-rw-r--r-- 1 mcc users 121K May 9 07:07 LTLFireability.txt
-rw-r--r-- 1 mcc users 353K May 9 07:07 LTLFireability.xml
-rw-r--r-- 1 mcc users 1.1M May 10 09:33 model.pnml
-rw-r--r-- 1 mcc users 2.2K May 9 07:07 UpperBounds.txt
-rw-r--r-- 1 mcc users 4.7K May 9 07:07 UpperBounds.xml
--------------------
content from stdout:
=== Data for post analysis generated by BenchKit (invocation template)
The expected result is a vector of positive values
NUM_VECTOR
here is the order used to build the result vector(from text file)
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-00
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-01
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-02
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-03
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-04
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-05
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-06
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-07
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-08
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-09
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-10
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-11
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-12
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-13
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-14
FORMULA_NAME BridgeAndVehicles-PT-V50P50N10-UpperBounds-15
=== Now, execution of the tool begins
BK_START 1652577672705
tapaal
Got BK_BIN_PATH=/home/mcc/BenchKit/bin/
---> tapaal --- 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 CLASSIC verifying UpperBounds *
*****************************************
TEMPDIR=/home/mcc/BenchKit/bin/tmp
QF=/home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB
MF=/home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG
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 ./UpperBounds.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.ic11LBmodB --write-reduced /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG -x 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 ./model.pnml ./UpperBounds.xml
Time left: 3589
---------------------------------------------------
Step 1: Parallel processing
---------------------------------------------------
Doing parallel verification of individual queries (16 in total)
Each query is verified by 4 parallel strategies for 138 seconds
------------------- QUERY 1 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved
Query is satisfied.
Spent 0.000317 on verification
@@@0.03,11956@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -s\ BFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 1 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-00 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3589
------------------- QUERY 2 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved
Query is satisfied.
Spent 0.000311 on verification
@@@0.03,11944@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -s\ BFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 2 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-05 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3589
------------------- 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 satisfied.
Solved using Trace Abstraction Refinement
Spent 8e-05 on verification
@@@0.04,11888@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -tar\ -q\ 0\ -l\ 0\ -d\ 0 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 3 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-01 50 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 3588
------------------- 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 satisfied.
Solved using Trace Abstraction Refinement
Spent 9.8e-05 on verification
@@@0.04,11852@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -tar\ -q\ 0\ -l\ 0\ -d\ 0 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 4 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-02 50 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 3588
------------------- QUERY 5 ----------------------
No solution found
Time left: 3448
------------------- QUERY 6 ----------------------
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 9.7e-05 on verification
@@@0.05,11780@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -tar\ -q\ 0\ -l\ 0\ -d\ 0 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 6 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-07 50 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 3448
------------------- QUERY 7 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved
Query is satisfied.
Spent 0.000765 on verification
@@@0.31,11908@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -s\ BFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 7 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-08 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3447
------------------- QUERY 8 ----------------------
No solution found
Time left: 3307
------------------- QUERY 9 ----------------------
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 0.000108 on verification
@@@0.05,12284@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -tar\ -q\ 0\ -l\ 0\ -d\ 0 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 9 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-10 50 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 3306
------------------- QUERY 10 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved
Query is satisfied.
Spent 0.009234 on verification
@@@0.32,11948@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -p\ -s\ DFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 10 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-11 50 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION
Time left: 3306
------------------- QUERY 11 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved
Query is satisfied.
Spent 0.000705 on verification
@@@0.31,11972@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -p\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 11 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-12 50 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION
Time left: 3305
------------------- QUERY 12 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved
Query is satisfied.
Spent 0.002792 on verification
@@@0.28,11828@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -p\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 12 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-13 50 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION
Time left: 3305
------------------- QUERY 13 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved
Query is satisfied.
Spent 0.002092 on verification
@@@0.28,11864@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -p\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 13 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-14 50 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION
Time left: 3304
------------------- QUERY 14 ----------------------
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 7.5e-05 on verification
@@@0.02,11972@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -tar\ -q\ 0\ -l\ 0\ -d\ 0 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 14 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-15 50 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 3304
------------------- QUERY 15 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved
Query is satisfied.
Spent 0.000561 on verification
@@@0.31,11840@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -s\ BFS\ -q\ 0\ -l\ 0\ -d\ 119 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 15 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-04 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3304
------------------- QUERY 16 ----------------------
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 8.1e-05 on verification
@@@0.02,11944@@@
parallel: This job succeeded:
eval /usr/bin/time -f "@@@%e,%M@@@" /home/mcc/BenchKit/bin/verifypn -n -n\ -tar\ -q\ 0\ -l\ 0\ -d\ 0 /home/mcc/BenchKit/bin/tmp/tmp.YiBZXaONSG /home/mcc/BenchKit/bin/tmp/tmp.ic11LBmodB --binary-query-io 1 -x 16 -n
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-06 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 3303
---------------------------------------------------
Step 2: Sequential processing
---------------------------------------------------
Remaining 2 queries are verified sequentially.
Each query is verified for a dynamic timeout (at least 0 seconds)
Time left: 3303
Time left: 3303
---------------------------------------------------
Step 3: Multiquery processing
---------------------------------------------------
Remaining 2 queries are solved using multiquery
Time remaining: 3303 seconds of the initial 3590 seconds
Running multiquery on -x 5,8 for 2477 seconds
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-03 10 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION
Query index 0 was solved
Query is NOT satisfied.
FORMULA BridgeAndVehicles-PT-V50P50N10-UpperBounds-09 10 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION
Query index 1 was solved
Query is NOT satisfied.
Spent 1432.68 on verification
"@@@1433.24,5606468@@@"
Solution found by multiquery processing (step 3) for query index 1
Solution found by multiquery processing (step 3) for query index 0
Time left: 1870
All queries are solved
Time left: 1870
terminated-with-cleanup
BK_STOP 1652579392449
--------------------
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="BridgeAndVehicles-PT-V50P50N10"
export BK_EXAMINATION="UpperBounds"
export BK_TOOL="tapaal"
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 2-4028"
echo " Executing tool tapaal"
echo " Input is BridgeAndVehicles-PT-V50P50N10, examination is UpperBounds"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r021-tall-165251913900253"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"
tar xzf /home/mcc/BenchKit/INPUTS/BridgeAndVehicles-PT-V50P50N10.tgz
mv BridgeAndVehicles-PT-V50P50N10 execution
cd execution
if [ "UpperBounds" = "ReachabilityDeadlock" ] || [ "UpperBounds" = "UpperBounds" ] || [ "UpperBounds" = "QuasiLiveness" ] || [ "UpperBounds" = "StableMarking" ] || [ "UpperBounds" = "Liveness" ] || [ "UpperBounds" = "OneSafe" ] || [ "UpperBounds" = "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 [ "UpperBounds" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "UpperBounds" != "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 "UpperBounds.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property UpperBounds.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "UpperBounds.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 '
echo "FORMULA_NAME $x"
done
elif [ "UpperBounds" = "ReachabilityDeadlock" ] || [ "UpperBounds" = "QuasiLiveness" ] || [ "UpperBounds" = "StableMarking" ] || [ "UpperBounds" = "Liveness" ] || [ "UpperBounds" = "OneSafe" ] ; then
echo "FORMULA_NAME UpperBounds"
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 ;