fond
Model Checking Contest 2022
12th edition, Bergen, Norway, June 21, 2022
Execution of r129-tall-165271816200013
Last Updated
Jun 22, 2022

About the Execution of Tapaal for HypercubeGrid-PT-C4K3P3B12

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
16226.539 3592875.00 9689746.00 7437.40 1 1 1 1 ? 1 1 1 1 ? ? ? 1 ? 1 ? normal

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.r129-tall-165271816200013.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)
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=====================================================================
Generated by BenchKit 2-4028
Executing tool tapaal
Input is HypercubeGrid-PT-C4K3P3B12, examination is UpperBounds
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r129-tall-165271816200013
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 3.2M
-rw-r--r-- 1 mcc users 12K Apr 29 16:00 CTLCardinality.txt
-rw-r--r-- 1 mcc users 109K Apr 29 16:00 CTLCardinality.xml
-rw-r--r-- 1 mcc users 8.8K Apr 29 15:16 CTLFireability.txt
-rw-r--r-- 1 mcc users 62K Apr 29 15:16 CTLFireability.xml
-rw-r--r-- 1 mcc users 6 May 10 09:34 equiv_col
-rw-r--r-- 1 mcc users 4.2K May 10 09:34 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 10 May 10 09:34 instance
-rw-r--r-- 1 mcc users 6 May 10 09:34 iscolored
-rw-r--r-- 1 mcc users 5.2K May 9 08:04 LTLCardinality.txt
-rw-r--r-- 1 mcc users 30K May 9 08:04 LTLCardinality.xml
-rw-r--r-- 1 mcc users 3.0K May 9 08:05 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K May 9 08:05 LTLFireability.xml
-rwxr-xr-x 1 mcc users 3.0M May 10 09:34 model.pnml
-rw-r--r-- 1 mcc users 2.0K May 9 08:05 UpperBounds.txt
-rw-r--r-- 1 mcc users 4.0K May 9 08:05 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 HypercubeGrid-PT-C4K3P3B12-UpperBounds-00
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-01
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-02
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-03
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-04
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-05
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-06
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-07
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-08
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-09
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-10
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-11
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-12
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-13
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-14
FORMULA_NAME HypercubeGrid-PT-C4K3P3B12-UpperBounds-15

=== Now, execution of the tool begins

BK_START 1652727447685

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.MEbhb1Iuy8
MF=/home/mcc/BenchKit/bin/tmp/tmp.XkT6ba5vNn
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.MEbhb1Iuy8 --write-reduced /home/mcc/BenchKit/bin/tmp/tmp.XkT6ba5vNn -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 0.001443 on verification
@@@0.21,30496@@@
Search strategy option was ignored as the TAR engine is called.
FORMULA HypercubeGrid-PT-C4K3P3B12-UpperBounds-00 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Query index 0 was solved

Query is NOT satisfied.


Solved using Trace Abstraction Refinement

Spent 0.080903 on verification
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.XkT6ba5vNn /home/mcc/BenchKit/bin/tmp/tmp.MEbhb1Iuy8 --binary-query-io 1 -x 1 -n

FORMULA HypercubeGrid-PT-C4K3P3B12-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)
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 0.000154 on verification
@@@0.12,29060@@@
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.XkT6ba5vNn /home/mcc/BenchKit/bin/tmp/tmp.MEbhb1Iuy8 --binary-query-io 1 -x 2 -n

FORMULA HypercubeGrid-PT-C4K3P3B12-UpperBounds-01 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 3588
------------------- QUERY 3 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is satisfied.

Spent 0.001254 on verification
@@@0.20,29096@@@
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.XkT6ba5vNn /home/mcc/BenchKit/bin/tmp/tmp.MEbhb1Iuy8 --binary-query-io 1 -x 3 -n

FORMULA HypercubeGrid-PT-C4K3P3B12-UpperBounds-02 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
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 NOT satisfied.


Solved using Trace Abstraction Refinement

Spent 0.071768 on verification
@@@0.19,29040@@@
FORMULA HypercubeGrid-PT-C4K3P3B12-UpperBounds-03 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Query index 0 was solved

Query is satisfied.

Spent 0.001256 on verification
@@@0.21,31096@@@
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.XkT6ba5vNn /home/mcc/BenchKit/bin/tmp/tmp.MEbhb1Iuy8 --binary-query-io 1 -x 4 -n
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.XkT6ba5vNn /home/mcc/BenchKit/bin/tmp/tmp.MEbhb1Iuy8 --binary-query-io 1 -x 4 -n

FORMULA HypercubeGrid-PT-C4K3P3B12-UpperBounds-03 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 3587
------------------- QUERY 5 ----------------------
No solution found
Command terminated by signal 9
@@@135.27,7779180@@@


Time left: 3447
------------------- QUERY 6 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is satisfied.

Spent 0.001297 on verification
@@@0.20,29192@@@
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.XkT6ba5vNn /home/mcc/BenchKit/bin/tmp/tmp.MEbhb1Iuy8 --binary-query-io 1 -x 6 -n

FORMULA HypercubeGrid-PT-C4K3P3B12-UpperBounds-05 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3446
------------------- QUERY 7 ----------------------
Solution found by parallel processing (step 1)
Query index 0 was solved

Query is satisfied.

Spent 0.001289 on verification
@@@0.18,30500@@@
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.XkT6ba5vNn /home/mcc/BenchKit/bin/tmp/tmp.MEbhb1Iuy8 --binary-query-io 1 -x 7 -n

FORMULA HypercubeGrid-PT-C4K3P3B12-UpperBounds-06 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT EXPLICIT STATE_COMPRESSION STUBBORN_SETS
Time left: 3446
------------------- 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 satisfied.


Solved using Trace Abstraction Refinement

Spent 0.000157 on verification
@@@0.11,29268@@@
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.XkT6ba5vNn /home/mcc/BenchKit/bin/tmp/tmp.MEbhb1Iuy8 --binary-query-io 1 -x 8 -n

FORMULA HypercubeGrid-PT-C4K3P3B12-UpperBounds-07 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 3445
------------------- 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 0.000176 on verification
@@@0.11,29036@@@
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.XkT6ba5vNn /home/mcc/BenchKit/bin/tmp/tmp.MEbhb1Iuy8 --binary-query-io 1 -x 9 -n

FORMULA HypercubeGrid-PT-C4K3P3B12-UpperBounds-08 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 3445
------------------- QUERY 10 ----------------------
No solution found
Command terminated by signal 9
@@@112.51,7187572@@@


Time left: 3305
------------------- QUERY 11 ----------------------
No solution found
Command terminated by signal 9
@@@121.21,7779968@@@


Time left: 3164
------------------- QUERY 12 ----------------------
No solution found
Command terminated by signal 9
@@@113.23,7190428@@@


Time left: 3024
------------------- QUERY 13 ----------------------
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 0.000196 on verification
@@@0.15,30092@@@
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.XkT6ba5vNn /home/mcc/BenchKit/bin/tmp/tmp.MEbhb1Iuy8 --binary-query-io 1 -x 13 -n

FORMULA HypercubeGrid-PT-C4K3P3B12-UpperBounds-12 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 3023
------------------- QUERY 14 ----------------------
No solution found
Command terminated by signal 9
@@@122.28,7873636@@@


Time left: 2883
------------------- QUERY 15 ----------------------
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 0.000201 on verification
@@@0.12,30156@@@
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.XkT6ba5vNn /home/mcc/BenchKit/bin/tmp/tmp.MEbhb1Iuy8 --binary-query-io 1 -x 15 -n

FORMULA HypercubeGrid-PT-C4K3P3B12-UpperBounds-14 1 TECHNIQUES COLLATERAL_PROCESSING STRUCTURAL_REDUCTION QUERY_REDUCTION SAT_SMT TRACE_ABSTRACTION_REFINEMENT
Time left: 2882
------------------- QUERY 16 ----------------------
No solution found
Command terminated by signal 9
@@@136.77,7705964@@@


Time left: 2742
---------------------------------------------------
Step 2: Sequential processing
---------------------------------------------------
Remaining 6 queries are verified sequentially.
Each query is verified for a dynamic timeout (at least 0 seconds)
Time left: 2742
Time left: 2742
---------------------------------------------------
Step 3: Multiquery processing
---------------------------------------------------
Remaining 6 queries are solved using multiquery
Time remaining: 2742 seconds of the initial 3590 seconds
Running multiquery on -x 5,10,11,12,14,16 for 2056 seconds
Command terminated by signal 9
"@@@398.39,16162544@@@"
Time left: 2344
---------------------------------------------------
Step 4: Random Parallel processing
---------------------------------------------------
Doing random parallel verification of individual queries (6 in total)
Each query is verified by 4 parallel strategies for 390 seconds
------------------- QUERY 5 ----------------------
No solution found
Command terminated by signal 9
@@@112.85,5407140@@@
Command terminated by signal 9
@@@167.26,8095812@@@
Command terminated by signal 9
@@@329.72,16109768@@@


Time left: 1952
------------------- QUERY 10 ----------------------
No solution found
Command terminated by signal 9
@@@112.78,5501740@@@
Command terminated by signal 9
@@@166.80,8194320@@@
Command terminated by signal 9
@@@330.68,16123436@@@


Time left: 1559
------------------- QUERY 11 ----------------------
No solution found
Command terminated by signal 9
@@@112.72,5485776@@@
Command terminated by signal 9
@@@168.20,8112632@@@
Command terminated by signal 9
@@@335.30,16119828@@@


Time left: 1166
------------------- QUERY 12 ----------------------
No solution found
Command terminated by signal 9
@@@112.20,5477848@@@
Command terminated by signal 9
@@@167.12,8081640@@@
Command terminated by signal 9
@@@331.50,16124604@@@


Time left: 773
------------------- QUERY 14 ----------------------
No solution found
Command terminated by signal 9
@@@113.71,5471944@@@
Command terminated by signal 9
@@@168.60,8089876@@@
Command terminated by signal 9
@@@345.55,16124368@@@


Time left: 381
------------------- QUERY 16 ----------------------
No solution found
Command terminated by signal 9
@@@112.79,5432796@@@
Command terminated by signal 9
@@@167.80,8090920@@@
Command terminated by signal 9
@@@337.54,16123108@@@


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

BK_STOP 1652731040560

--------------------
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="HypercubeGrid-PT-C4K3P3B12"
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 HypercubeGrid-PT-C4K3P3B12, 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 r129-tall-165271816200013"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/HypercubeGrid-PT-C4K3P3B12.tgz
mv HypercubeGrid-PT-C4K3P3B12 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 '' UpperBounds.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
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 ;