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.r222-smll-167840361600085.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)
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=====================================================================
Generated by BenchKit 2-5348
Executing tool gold2022
Input is GPUForwardProgress-PT-32a, examination is CTLCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r222-smll-167840361600085
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 428K
-rw-r--r-- 1 mcc users 8.5K Feb 25 14:35 CTLCardinality.txt
-rw-r--r-- 1 mcc users 99K Feb 25 14:35 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.4K Feb 25 14:21 CTLFireability.txt
-rw-r--r-- 1 mcc users 47K Feb 25 14:21 CTLFireability.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 equiv_col
-rw-r--r-- 1 mcc users 4 Mar 5 18:22 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:22 iscolored
-rw-r--r-- 1 mcc users 3.3K Feb 25 16:12 LTLCardinality.txt
-rw-r--r-- 1 mcc users 23K Feb 25 16:12 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K Feb 25 16:12 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K Feb 25 16:12 LTLFireability.xml
-rw-r--r-- 1 mcc users 50K Mar 5 18:22 model.pnml
-rw-r--r-- 1 mcc users 6.5K Feb 25 14:43 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 60K Feb 25 14:43 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 7.2K Feb 25 14:39 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 58K Feb 25 14:39 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Feb 25 16:12 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.8K Feb 25 16:12 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 GPUForwardProgress-PT-32a-CTLCardinality-00
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-01
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-02
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-03
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-04
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-05
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-06
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-07
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-08
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-09
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-10
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-11
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-12
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-13
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-14
FORMULA_NAME GPUForwardProgress-PT-32a-CTLCardinality-15

=== Now, execution of the tool begins

BK_START 1678622966638

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 CTLCardinality *
*************************************
TEMPDIR=/home/mcc/BenchKit/bin/tmp
QF=/home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N
MF=/home/mcc/BenchKit/bin/tmp/tmp.wXGVI8AH4X
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 ./CTLCardinality.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.KsG0m7nL2N --write-reduced /home/mcc/BenchKit/bin/tmp/tmp.wXGVI8AH4X -x 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16 ./model.pnml ./CTLCardinality.xml
FORMULA GPUForwardProgress-PT-32a-CTLCardinality-00 TRUE TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT LP_APPROX
Query index 0 was solved

Query is satisfied.
Solution found by parallel simplification (step 0)
Time left: 3590

---------------------------------------------------
Step 1: Parallel processing
---------------------------------------------------
Doing parallel verification of individual queries (15 in total)
Each query is verified by 4 parallel strategies for 299 seconds
------------------- QUERY 1 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is satisfied.

Spent 0.123889 on verification
@@@0.13,59832@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 1 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-06 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 3589
------------------- QUERY 2 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is satisfied.

Spent 0.0938 on verification
@@@0.10,59756@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 2 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-05 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 3589
------------------- QUERY 3 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is satisfied.

Spent 0.102029 on verification
@@@0.10,59740@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 3 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-13 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 3588
------------------- QUERY 4 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is satisfied.

Spent 0.09815 on verification
@@@0.10,59888@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 4 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-12 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 3588
------------------- QUERY 5 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is satisfied.

Spent 0.099742 on verification
@@@0.12,59912@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 5 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-03 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 3587
------------------- QUERY 6 ----------------------
No solution found
Command terminated by signal 9
@@@136.64,5895400@@@
Command terminated by signal 9
@@@226.78,8693564@@@


Time left: 3285
------------------- QUERY 7 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is NOT satisfied.

Spent 0.069567 on verification
@@@0.09,59740@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 7 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-01 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 3285
------------------- QUERY 8 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is satisfied.

Spent 0.080609 on verification
@@@0.09,59640@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 8 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-11 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 3284
------------------- QUERY 9 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is satisfied.

Spent 0.064658 on verification
@@@0.07,59620@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 9 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-10 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 3284
------------------- QUERY 10 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is NOT satisfied.

Spent 1.39355 on verification
@@@1.40,67952@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 10 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-09 FALSE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 3282
------------------- QUERY 11 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is satisfied.

Spent 0.062411 on verification
@@@0.06,59824@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 11 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-02 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 3282
------------------- QUERY 12 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is satisfied.

Spent 0.067083 on verification
@@@0.07,60000@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 12 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-15 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 3282
------------------- QUERY 13 ----------------------
No solution found
Command terminated by signal 9
@@@229.92,7058332@@@


Time left: 2979
------------------- QUERY 14 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is satisfied.

Spent 6.69729 on verification
@@@6.74,277440@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 14 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-08 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 2972
------------------- QUERY 15 ----------------------
Solution found by parallel processing (step 1)


Query index 0 was solved
Query is satisfied.

Spent 0.074487 on verification
@@@0.09,59868@@@
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.wXGVI8AH4X /home/mcc/BenchKit/bin/tmp/tmp.KsG0m7nL2N --binary-query-io 1 -x 15 -n

FORMULA GPUForwardProgress-PT-32a-CTLCardinality-04 TRUE TECHNIQUES COLLATERAL_PROCESSING EXPLICIT STATE_COMPRESSION SAT_SMT STUBBORN_SETS CTL_CZERO
Time left: 2972
---------------------------------------------------
Step 2: Sequential processing
---------------------------------------------------
Remaining 2 queries are verified sequentially.
Each query is verified for a dynamic timeout (at least 512 seconds)
Time left: 2972
------------------- QUERY 6 ----------------------
Running query 6 for 1486 seconds. Remaining: 2 queries and 2972 seconds
No solution found
Command terminated by signal 9
@@@202.99,8628260@@@
Command terminated by signal 9
@@@453.27,16146784@@@


Time left: 2518
------------------- QUERY 13 ----------------------
Running query 13 for 2518 seconds. Remaining: 1 queries and 2518 seconds
No solution found
Command terminated by signal 9
@@@264.33,8725496@@@
Command terminated by signal 9
@@@589.41,16147604@@@


Time left: 1929
Time left: 1928
---------------------------------------------------
Step 4: Random Parallel processing
---------------------------------------------------
Doing random parallel verification of individual queries (2 in total)
Each query is verified by 4 parallel strategies for 964 seconds
------------------- QUERY 6 ----------------------
No solution found
Command terminated by signal 9
@@@138.03,4264856@@@
Command terminated by signal 9
@@@185.77,5727564@@@
Command terminated by signal 9
@@@275.03,8347408@@@
Command terminated by signal 9
@@@581.01,16147152@@@


Time left: 1347
------------------- QUERY 13 ----------------------
No solution found
Command terminated by signal 9
@@@134.03,4104756@@@
Command terminated by signal 9
@@@187.42,5437480@@@
Command terminated by signal 9
@@@287.31,8154532@@@
Command terminated by signal 9
@@@579.81,16148024@@@


Time left: 767
Time left: 767
---------------------------------------------------
Step 4: Random Parallel processing
---------------------------------------------------
Doing random parallel verification of individual queries (2 in total)
Each query is verified by 4 parallel strategies for 383 seconds
------------------- QUERY 6 ----------------------
No solution found
Command terminated by signal 9
@@@111.17,4186424@@@
Command terminated by signal 9
@@@177.90,5663836@@@
Command terminated by signal 9
@@@265.46,8586236@@@


Time left: 381
------------------- QUERY 13 ----------------------
No solution found
Command terminated by signal 9
@@@134.77,4200328@@@
Command terminated by signal 9
@@@211.07,5620260@@@
Command terminated by signal 9
@@@316.66,8141952@@@


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

BK_STOP 1678626559458

--------------------
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="GPUForwardProgress-PT-32a"
export BK_EXAMINATION="CTLCardinality"
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 GPUForwardProgress-PT-32a, examination is CTLCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r222-smll-167840361600085"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/GPUForwardProgress-PT-32a.tgz
mv GPUForwardProgress-PT-32a execution
cd execution
if [ "CTLCardinality" = "ReachabilityDeadlock" ] || [ "CTLCardinality" = "UpperBounds" ] || [ "CTLCardinality" = "QuasiLiveness" ] || [ "CTLCardinality" = "StableMarking" ] || [ "CTLCardinality" = "Liveness" ] || [ "CTLCardinality" = "OneSafe" ] || [ "CTLCardinality" = "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 [ "CTLCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "CTLCardinality" != "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 "CTLCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property CTLCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "CTLCardinality.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 '' CTLCardinality.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "CTLCardinality" = "ReachabilityDeadlock" ] || [ "CTLCardinality" = "QuasiLiveness" ] || [ "CTLCardinality" = "StableMarking" ] || [ "CTLCardinality" = "Liveness" ] || [ "CTLCardinality" = "OneSafe" ] ; then
echo "FORMULA_NAME CTLCardinality"
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 ;