Execution Chart

We display below the execution chart for this examination (boot time has been removed).

Trace from the execution

Formatting '/data/fkordon/mcc2024-input.r538-tall-171690547600138.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2024-input.qcow2 backing_fmt=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 2-5568
Executing tool ltsminxred
Input is StigmergyCommit-PT-10a, examination is StableMarking
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r538-tall-171690547600138
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 155M
-rw-r--r-- 1 mcc users 5.9K May 14 13:22 CTLCardinality.txt
-rw-r--r-- 1 mcc users 56K May 14 13:22 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.3K May 14 13:22 CTLFireability.txt
-rw-r--r-- 1 mcc users 56K May 14 13:22 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.8K May 19 07:17 LTLCardinality.txt
-rw-r--r-- 1 mcc users 29K May 19 16:42 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K May 19 07:34 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K May 19 19:24 LTLFireability.xml
-rw-r--r-- 1 mcc users 14K Apr 11 17:58 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 157K Apr 11 17:58 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.2K Apr 11 17:53 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 64K Apr 11 17:53 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.7K Apr 23 07:59 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K Apr 23 07:59 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 18 16:43 equiv_col
-rw-r--r-- 1 mcc users 4 May 18 16:43 instance
-rw-r--r-- 1 mcc users 6 May 18 16:43 iscolored
-rw-r--r-- 1 mcc users 155M May 18 16:43 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 StableMarking

=== Now, execution of the tool begins

BK_START 1717226815994

Invoking MCC driver with
BK_TOOL=ltsminxred
BK_EXAMINATION=StableMarking
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=1800
BK_INPUT=StigmergyCommit-PT-10a
BK_MEMORY_CONFINEMENT=16384
Applying reductions before tool ltsmin
Invoking reducer
Running Version 202405141337
[2024-06-01 07:26:57] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, StableMarking, -timeout, 180, -rebuildPNML]
[2024-06-01 07:26:57] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2024-06-01 07:27:02] [INFO ] Load time of PNML (sax parser for PT used): 5079 ms
[2024-06-01 07:27:02] [INFO ] Transformed 400 places.
[2024-06-01 07:27:02] [INFO ] Transformed 136960 transitions.
[2024-06-01 07:27:02] [INFO ] Found NUPN structural information;
[2024-06-01 07:27:02] [INFO ] Parsed PT model containing 400 places and 136960 transitions and 3002181 arcs in 5885 ms.
Structural test allowed to assert that 24 places are NOT stable. Took 100 ms.
Ensure Unique test removed 132345 transitions
Reduce redundant transitions removed 132345 transitions.
RANDOM walk for 40000 steps (8 resets) in 12555 ms. (3 steps per ms) remains 216/376 properties
BEST_FIRST walk for 404 steps (8 resets) in 9 ms. (40 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 9 ms. (40 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 7 ms. (50 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 12 ms. (31 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 10 ms. (36 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 12 ms. (31 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 9 ms. (40 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 8 ms. (44 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 8 ms. (44 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 8 ms. (44 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 9 ms. (40 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 10 ms. (36 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 11 ms. (33 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 10 ms. (36 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 10 ms. (36 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 8 ms. (44 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 7 ms. (50 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 11 ms. (33 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 8 ms. (44 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 12 ms. (31 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 7 ms. (50 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 8 ms. (44 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 12 ms. (31 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 8 ms. (44 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 9 ms. (40 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 10 ms. (36 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 9 ms. (40 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 5 ms. (67 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 9 ms. (40 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 6 ms. (57 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 9 ms. (40 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 5 ms. (67 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 7 ms. (50 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 5 ms. (67 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 8 ms. (44 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 6 ms. (57 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 8 ms. (44 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 8 ms. (44 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 7 ms. (50 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 7 ms. (50 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 5 ms. (67 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 6 ms. (57 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 7 ms. (50 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 5 ms. (67 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 7 ms. (50 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 8 ms. (44 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 6 ms. (57 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 4 ms. (80 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 5 ms. (67 steps per ms) remains 216/216 properties
BEST_FIRST walk for 404 steps (8 resets) in 6 ms. (57 steps per ms) remains 216/216 properties
[2024-06-01 07:27:07] [INFO ] Flow matrix only has 4582 transitions (discarded 33 similar events)
// Phase 1: matrix 4582 rows 400 cols
[2024-06-01 07:27:07] [INFO ] Computed 12 invariants in 61 ms
[2024-06-01 07:27:08] [INFO ] State equation strengthened by 4247 read => feed constraints.
All remaining problems are real, not stopping.
At refinement iteration 0 (INCLUDED_ONLY) 0/216 variables, 216/216 constraints. Problems are: Problem set: 0 solved, 216 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/216 variables, 0/216 constraints. Problems are: Problem set: 0 solved, 216 unsolved
At refinement iteration 2 (OVERLAPS) 183/399 variables, 11/227 constraints. Problems are: Problem set: 0 solved, 216 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/399 variables, 183/410 constraints. Problems are: Problem set: 0 solved, 216 unsolved
At refinement iteration 4 (INCLUDED_ONLY) 0/399 variables, 0/410 constraints. Problems are: Problem set: 0 solved, 216 unsolved
At refinement iteration 5 (OVERLAPS) 1/400 variables, 1/411 constraints. Problems are: Problem set: 0 solved, 216 unsolved
At refinement iteration 6 (INCLUDED_ONLY) 0/400 variables, 1/412 constraints. Problems are: Problem set: 0 solved, 216 unsolved
Solver is answering 'unknown', stopping.
After SMT solving in domain Real declared 400/4982 variables, and 412 constraints, problems are : Problem set: 0 solved, 216 unsolved in 5045 ms.
Refiners :[Domain max(s): 400/400 constraints, Positive P Invariants (semi-flows): 12/12 constraints, State Equation: 0/400 constraints, ReadFeed: 0/4247 constraints, PredecessorRefiner: 216/216 constraints, Known Traps: 0/0 constraints]
Escalating to Integer solving :Problem set: 0 solved, 216 unsolved
At refinement iteration 0 (INCLUDED_ONLY) 0/216 variables, 216/216 constraints. Problems are: Problem set: 0 solved, 216 unsolved
At refinement iteration 1 (INCLUDED_ONLY) 0/216 variables, 0/216 constraints. Problems are: Problem set: 0 solved, 216 unsolved
At refinement iteration 2 (OVERLAPS) 183/399 variables, 11/227 constraints. Problems are: Problem set: 0 solved, 216 unsolved
At refinement iteration 3 (INCLUDED_ONLY) 0/399 variables, 183/410 constraints. Problems are: Problem set: 0 solved, 216 unsolved
[2024-06-01 07:27:16] [INFO ] Deduced a trap composed of 16 places in 1500 ms of which 36 ms to minimize.
[2024-06-01 07:27:17] [INFO ] Deduced a trap composed of 16 places in 1485 ms of which 3 ms to minimize.
[2024-06-01 07:27:18] [INFO ] Deduced a trap composed of 17 places in 1434 ms of which 3 ms to minimize.
SMT process timed out in 11380ms, After SMT, problems are : Problem set: 0 solved, 216 unsolved
Skipping Parikh replay, no witness traces provided.
Support contains 216 out of 400 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 400/400 places, 4615/4615 transitions.
Graph (complete) has 993 edges and 400 vertex of which 398 are kept as prefixes of interest. Removing 2 places using SCC suffix rule.29 ms
Discarding 2 places :
Also discarding 2 output transitions
Drop transitions (Output transitions of discarded places.) removed 2 transitions
Drop transitions (Empty/Sink Transition effects.) removed 34 transitions
Reduce isomorphic transitions removed 34 transitions.
Drop transitions (Trivial Post-Agglo cleanup.) removed 25 transitions
Trivial Post-agglo rules discarded 25 transitions
Performed 25 trivial Post agglomeration. Transition count delta: 25
Iterating post reduction 0 with 59 rules applied. Total rules applied 60 place count 398 transition count 4554
Reduce places removed 25 places and 0 transitions.
Ensure Unique test removed 22 transitions
Reduce isomorphic transitions removed 22 transitions.
Drop transitions (Trivial Post-Agglo cleanup.) removed 11 transitions
Trivial Post-agglo rules discarded 11 transitions
Performed 11 trivial Post agglomeration. Transition count delta: 11
Iterating post reduction 1 with 58 rules applied. Total rules applied 118 place count 373 transition count 4521
Reduce places removed 11 places and 0 transitions.
Iterating post reduction 2 with 11 rules applied. Total rules applied 129 place count 362 transition count 4521
Performed 37 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 3 with 37 Pre rules applied. Total rules applied 129 place count 362 transition count 4484
Deduced a syphon composed of 37 places in 2 ms
Reduce places removed 37 places and 0 transitions.
Iterating global reduction 3 with 74 rules applied. Total rules applied 203 place count 325 transition count 4484
Discarding 16 places :
Symmetric choice reduction at 3 with 16 rule applications. Total rules 219 place count 309 transition count 4468
Iterating global reduction 3 with 16 rules applied. Total rules applied 235 place count 309 transition count 4468
Discarding 16 places :
Symmetric choice reduction at 3 with 16 rule applications. Total rules 251 place count 293 transition count 4452
Iterating global reduction 3 with 16 rules applied. Total rules applied 267 place count 293 transition count 4452
Ensure Unique test removed 2047 transitions
Reduce isomorphic transitions removed 2047 transitions.
Iterating post reduction 3 with 2047 rules applied. Total rules applied 2314 place count 293 transition count 2405
Discarding 1 places :
Symmetric choice reduction at 4 with 1 rule applications. Total rules 2315 place count 292 transition count 2404
Iterating global reduction 4 with 1 rules applied. Total rules applied 2316 place count 292 transition count 2404
Discarding 1 places :
Symmetric choice reduction at 4 with 1 rule applications. Total rules 2317 place count 291 transition count 2403
Iterating global reduction 4 with 1 rules applied. Total rules applied 2318 place count 291 transition count 2403
Performed 11 Post agglomeration using F-continuation condition.Transition count delta: 11
Deduced a syphon composed of 11 places in 2 ms
Reduce places removed 11 places and 0 transitions.
Iterating global reduction 4 with 22 rules applied. Total rules applied 2340 place count 280 transition count 2392
Discarding 10 places :
Symmetric choice reduction at 4 with 10 rule applications. Total rules 2350 place count 270 transition count 2382
Iterating global reduction 4 with 10 rules applied. Total rules applied 2360 place count 270 transition count 2382
Discarding 1 places :
Symmetric choice reduction at 4 with 1 rule applications. Total rules 2361 place count 269 transition count 2381
Iterating global reduction 4 with 1 rules applied. Total rules applied 2362 place count 269 transition count 2381
Discarding 1 places :
Symmetric choice reduction at 4 with 1 rule applications. Total rules 2363 place count 268 transition count 2380
Iterating global reduction 4 with 1 rules applied. Total rules applied 2364 place count 268 transition count 2380
Drop transitions (Redundant composition of simpler transitions.) removed 3 transitions
Redundant transition composition rules discarded 3 transitions
Iterating global reduction 4 with 3 rules applied. Total rules applied 2367 place count 268 transition count 2377
Partial Free-agglomeration rule applied 4 times.
Drop transitions (Partial Free agglomeration) removed 4 transitions
Iterating global reduction 4 with 4 rules applied. Total rules applied 2371 place count 268 transition count 2377
Drop transitions (Redundant composition of simpler transitions.) removed 2 transitions
Redundant transition composition rules discarded 2 transitions
Iterating global reduction 4 with 2 rules applied. Total rules applied 2373 place count 268 transition count 2375
Reduce places removed 1 places and 1 transitions.
Iterating global reduction 4 with 1 rules applied. Total rules applied 2374 place count 267 transition count 2374
Reduce places removed 1 places and 0 transitions.
Drop transitions (Trivial Post-Agglo cleanup.) removed 9 transitions
Trivial Post-agglo rules discarded 9 transitions
Performed 9 trivial Post agglomeration. Transition count delta: 9
Iterating post reduction 4 with 10 rules applied. Total rules applied 2384 place count 266 transition count 2365
Reduce places removed 9 places and 0 transitions.
Iterating post reduction 5 with 9 rules applied. Total rules applied 2393 place count 257 transition count 2365
Performed 13 Post agglomeration using F-continuation condition with reduction of 2034 identical transitions.
Deduced a syphon composed of 13 places in 1 ms
Reduce places removed 13 places and 0 transitions.
Iterating global reduction 6 with 26 rules applied. Total rules applied 2419 place count 244 transition count 318
Drop transitions (Empty/Sink Transition effects.) removed 11 transitions
Reduce isomorphic transitions removed 11 transitions.
Iterating post reduction 6 with 11 rules applied. Total rules applied 2430 place count 244 transition count 307
Drop transitions (Redundant composition of simpler transitions.) removed 2 transitions
Redundant transition composition rules discarded 2 transitions
Iterating global reduction 7 with 2 rules applied. Total rules applied 2432 place count 244 transition count 305
Reduce places removed 11 places and 11 transitions.
Iterating global reduction 7 with 11 rules applied. Total rules applied 2443 place count 233 transition count 294
Applied a total of 2443 rules in 2737 ms. Remains 233 /400 variables (removed 167) and now considering 294/4615 (removed 4321) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 2746 ms. Remains : 233/400 places, 294/4615 transitions.
RANDOM walk for 6265 steps (160 resets) in 67 ms. (92 steps per ms) remains 0/216 properties
Able to resolve query StableMarking after proving 377 properties.
FORMULA StableMarking FALSE TECHNIQUES RANDOM_WALK MARKED_SUFFIX_TEST TOPOLOGICAL
Total runtime 24730 ms.
ITS solved all properties within timeout

BK_STOP 1717226841822

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

+ ulimit -s 65536
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
+ export PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ PYTHONPATH=/home/mcc/BenchKit/itstools/pylibs
+ export LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
+ LD_LIBRARY_PATH=/home/mcc/BenchKit/itstools/pylibs:
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202405141337.jar
+ VERSION=202405141337
+ echo 'Running Version 202405141337'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination StableMarking -timeout 180 -rebuildPNML

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="StigmergyCommit-PT-10a"
export BK_EXAMINATION="StableMarking"
export BK_TOOL="ltsminxred"
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 2-5568"
echo " Executing tool ltsminxred"
echo " Input is StigmergyCommit-PT-10a, examination is StableMarking"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r538-tall-171690547600138"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/StigmergyCommit-PT-10a.tgz
mv StigmergyCommit-PT-10a execution
cd execution
if [ "StableMarking" = "ReachabilityDeadlock" ] || [ "StableMarking" = "UpperBounds" ] || [ "StableMarking" = "QuasiLiveness" ] || [ "StableMarking" = "StableMarking" ] || [ "StableMarking" = "Liveness" ] || [ "StableMarking" = "OneSafe" ] || [ "StableMarking" = "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 [ "StableMarking" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "StableMarking" != "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 "StableMarking.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property StableMarking.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "StableMarking.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 '' StableMarking.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "StableMarking" = "ReachabilityDeadlock" ] || [ "StableMarking" = "QuasiLiveness" ] || [ "StableMarking" = "StableMarking" ] || [ "StableMarking" = "Liveness" ] || [ "StableMarking" = "OneSafe" ] ; then
echo "FORMULA_NAME StableMarking"
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 ;