About the Execution of LTSMin+red for Szymanski-PT-b04
| Execution Summary | |||||
| Max Memory Used (MB) |
Time wait (ms) | CPU Usage (ms) | I/O Wait (ms) | Computed Result | Execution Status |
| 1441.396 | 144354.00 | 179607.00 | 656.30 | FFTFTTFFF?FFFTFF | normal |
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.r489-tall-167912706800459.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 ltsminxred
Input is Szymanski-PT-b04, examination is LTLCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r489-tall-167912706800459
=====================================================================
--------------------
preparation of the directory to be used:
/home/mcc/execution
total 4.2M
-rw-r--r-- 1 mcc users 8.4K Feb 26 16:53 CTLCardinality.txt
-rw-r--r-- 1 mcc users 95K Feb 26 16:53 CTLCardinality.xml
-rw-r--r-- 1 mcc users 5.6K Feb 26 16:52 CTLFireability.txt
-rw-r--r-- 1 mcc users 52K Feb 26 16:52 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.3K Feb 25 17:19 LTLCardinality.txt
-rw-r--r-- 1 mcc users 24K Feb 25 17:19 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.1K Feb 25 17:19 LTLFireability.txt
-rw-r--r-- 1 mcc users 14K Feb 25 17:19 LTLFireability.xml
-rw-r--r-- 1 mcc users 18K Feb 26 16:55 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 205K Feb 26 16:55 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 11K Feb 26 16:54 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 95K Feb 26 16:54 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Feb 25 17:19 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Feb 25 17:19 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 equiv_col
-rw-r--r-- 1 mcc users 4 Mar 5 18:23 instance
-rw-r--r-- 1 mcc users 6 Mar 5 18:23 iscolored
-rw-r--r-- 1 mcc users 3.7M Mar 5 18:23 model.pnml
--------------------
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 Szymanski-PT-b04-LTLCardinality-00
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-01
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-02
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-03
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-04
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-05
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-06
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-07
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-08
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-09
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-10
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-11
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-12
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-13
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-14
FORMULA_NAME Szymanski-PT-b04-LTLCardinality-15
=== Now, execution of the tool begins
BK_START 1679249551890
bash -c /home/mcc/BenchKit/BenchKit_head.sh 2> STDERR ; echo ; echo -n "BK_STOP " ; date -u +%s%3N
Invoking MCC driver with
BK_TOOL=ltsminxred
BK_EXAMINATION=LTLCardinality
BK_BIN_PATH=/home/mcc/BenchKit/bin/
BK_TIME_CONFINEMENT=3600
BK_INPUT=Szymanski-PT-b04
Applying reductions before tool ltsmin
Invoking reducer
Running Version 202303021504
[2023-03-19 18:12:33] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, LTLCardinality, -timeout, 360, -rebuildPNML]
[2023-03-19 18:12:33] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-19 18:12:33] [INFO ] Load time of PNML (sax parser for PT used): 314 ms
[2023-03-19 18:12:33] [INFO ] Transformed 568 places.
[2023-03-19 18:12:33] [INFO ] Transformed 8320 transitions.
[2023-03-19 18:12:33] [INFO ] Parsed PT model containing 568 places and 8320 transitions and 33408 arcs in 498 ms.
Parsed 16 properties from file /home/mcc/execution/LTLCardinality.xml in 10 ms.
Working with output stream class java.io.PrintStream
Initial state reduction rules removed 3 formulas.
Deduced a syphon composed of 260 places in 19 ms
Reduce places removed 260 places and 256 transitions.
Initial state reduction rules removed 1 formulas.
FORMULA Szymanski-PT-b04-LTLCardinality-00 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b04-LTLCardinality-01 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b04-LTLCardinality-03 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b04-LTLCardinality-05 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b04-LTLCardinality-06 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b04-LTLCardinality-07 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b04-LTLCardinality-11 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b04-LTLCardinality-13 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b04-LTLCardinality-15 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b04-LTLCardinality-02 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-b04-LTLCardinality-04 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Support contains 9 out of 308 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 308/308 places, 8064/8064 transitions.
Reduce places removed 2 places and 0 transitions.
Iterating post reduction 0 with 2 rules applied. Total rules applied 2 place count 306 transition count 8064
Discarding 1 places :
Symmetric choice reduction at 1 with 1 rule applications. Total rules 3 place count 305 transition count 7936
Iterating global reduction 1 with 1 rules applied. Total rules applied 4 place count 305 transition count 7936
Applied a total of 4 rules in 225 ms. Remains 305 /308 variables (removed 3) and now considering 7936/8064 (removed 128) transitions.
[2023-03-19 18:12:34] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
// Phase 1: matrix 2732 rows 305 cols
[2023-03-19 18:12:34] [INFO ] Computed 1 place invariants in 54 ms
[2023-03-19 18:12:35] [INFO ] Implicit Places using invariants in 737 ms returned []
[2023-03-19 18:12:35] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:12:35] [INFO ] Invariant cache hit.
[2023-03-19 18:12:35] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-19 18:12:43] [INFO ] Implicit Places using invariants and state equation in 8109 ms returned []
Implicit Place search using SMT with State Equation took 8878 ms to find 0 implicit places.
[2023-03-19 18:12:43] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:12:43] [INFO ] Invariant cache hit.
[2023-03-19 18:12:45] [INFO ] Dead Transitions using invariants and state equation in 2217 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 305/308 places, 7936/8064 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 11325 ms. Remains : 305/308 places, 7936/8064 transitions.
Support contains 9 out of 305 places after structural reductions.
[2023-03-19 18:12:46] [INFO ] Flatten gal took : 459 ms
[2023-03-19 18:12:46] [INFO ] Flatten gal took : 291 ms
[2023-03-19 18:12:46] [INFO ] Input system was already deterministic with 7936 transitions.
Incomplete random walk after 10002 steps, including 2 resets, run finished after 324 ms. (steps per millisecond=30 ) properties (out of 7) seen :1
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 60 ms. (steps per millisecond=166 ) properties (out of 6) seen :1
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 50 ms. (steps per millisecond=200 ) properties (out of 5) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 46 ms. (steps per millisecond=217 ) properties (out of 5) seen :0
Incomplete Best-First random walk after 10001 steps, including 5 resets, run finished after 39 ms. (steps per millisecond=256 ) properties (out of 5) seen :0
Incomplete Best-First random walk after 10001 steps, including 3 resets, run finished after 34 ms. (steps per millisecond=294 ) properties (out of 5) seen :0
Running SMT prover for 5 properties.
[2023-03-19 18:12:47] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:12:47] [INFO ] Invariant cache hit.
[2023-03-19 18:12:47] [INFO ] After 100ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:5
[2023-03-19 18:12:47] [INFO ] [Nat]Absence check using 0 positive and 1 generalized place invariants in 2 ms returned sat
[2023-03-19 18:12:49] [INFO ] After 1663ms SMT Verify possible using state equation in natural domain returned unsat :1 sat :4
[2023-03-19 18:12:49] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-19 18:13:04] [INFO ] After 14934ms SMT Verify possible using 147 Read/Feed constraints in natural domain returned unsat :1 sat :3
[2023-03-19 18:13:05] [INFO ] After 15749ms SMT Verify possible using trap constraints in natural domain returned unsat :1 sat :3
Attempting to minimize the solution found.
Minimization took 279 ms.
[2023-03-19 18:13:05] [INFO ] After 17838ms SMT Verify possible using all constraints in natural domain returned unsat :1 sat :3
Fused 5 Parikh solutions to 4 different solutions.
Parikh walk visited 0 properties in 78 ms.
Support contains 6 out of 305 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 305/305 places, 7936/7936 transitions.
Drop transitions removed 127 transitions
Reduce isomorphic transitions removed 127 transitions.
Iterating post reduction 0 with 127 rules applied. Total rules applied 127 place count 305 transition count 7809
Applied a total of 127 rules in 437 ms. Remains 305 /305 variables (removed 0) and now considering 7809/7936 (removed 127) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 439 ms. Remains : 305/305 places, 7809/7936 transitions.
Incomplete random walk after 10003 steps, including 2 resets, run finished after 125 ms. (steps per millisecond=80 ) properties (out of 4) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 60 ms. (steps per millisecond=166 ) properties (out of 4) seen :0
Incomplete Best-First random walk after 10000 steps, including 2 resets, run finished after 36 ms. (steps per millisecond=277 ) properties (out of 4) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 29 ms. (steps per millisecond=344 ) properties (out of 4) seen :0
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 30 ms. (steps per millisecond=333 ) properties (out of 4) seen :0
Interrupted probabilistic random walk after 132836 steps, run timeout after 3001 ms. (steps per millisecond=44 ) properties seen :{}
Probabilistic random walk after 132836 steps, saw 52332 distinct states, run finished after 3002 ms. (steps per millisecond=44 ) properties seen :0
Running SMT prover for 4 properties.
[2023-03-19 18:13:09] [INFO ] Flow matrix only has 2605 transitions (discarded 5204 similar events)
// Phase 1: matrix 2605 rows 305 cols
[2023-03-19 18:13:09] [INFO ] Computed 2 place invariants in 35 ms
[2023-03-19 18:13:09] [INFO ] After 61ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:4
[2023-03-19 18:13:09] [INFO ] [Nat]Absence check using 1 positive place invariants in 0 ms returned sat
[2023-03-19 18:13:09] [INFO ] [Nat]Absence check using 1 positive and 1 generalized place invariants in 3 ms returned sat
[2023-03-19 18:13:10] [INFO ] After 1172ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :4
[2023-03-19 18:13:10] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-19 18:13:21] [INFO ] After 11080ms SMT Verify possible using 147 Read/Feed constraints in natural domain returned unsat :0 sat :3
[2023-03-19 18:13:22] [INFO ] Deduced a trap composed of 45 places in 507 ms of which 1 ms to minimize.
[2023-03-19 18:13:22] [INFO ] Trap strengthening (SAT) tested/added 2/1 trap constraints in 641 ms
[2023-03-19 18:13:22] [INFO ] After 11994ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :3
Attempting to minimize the solution found.
Minimization took 179 ms.
[2023-03-19 18:13:22] [INFO ] After 13454ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :3
Parikh walk visited 0 properties in 39 ms.
Support contains 6 out of 305 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 305/305 places, 7809/7809 transitions.
Applied a total of 0 rules in 217 ms. Remains 305 /305 variables (removed 0) and now considering 7809/7809 (removed 0) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 224 ms. Remains : 305/305 places, 7809/7809 transitions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 305/305 places, 7809/7809 transitions.
Applied a total of 0 rules in 191 ms. Remains 305 /305 variables (removed 0) and now considering 7809/7809 (removed 0) transitions.
[2023-03-19 18:13:23] [INFO ] Flow matrix only has 2605 transitions (discarded 5204 similar events)
[2023-03-19 18:13:23] [INFO ] Invariant cache hit.
[2023-03-19 18:13:23] [INFO ] Implicit Places using invariants in 530 ms returned []
[2023-03-19 18:13:23] [INFO ] Flow matrix only has 2605 transitions (discarded 5204 similar events)
[2023-03-19 18:13:23] [INFO ] Invariant cache hit.
[2023-03-19 18:13:24] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-19 18:13:32] [INFO ] Implicit Places using invariants and state equation in 8663 ms returned []
Implicit Place search using SMT with State Equation took 9208 ms to find 0 implicit places.
[2023-03-19 18:13:33] [INFO ] Redundant transitions in 931 ms returned []
[2023-03-19 18:13:33] [INFO ] Flow matrix only has 2605 transitions (discarded 5204 similar events)
[2023-03-19 18:13:33] [INFO ] Invariant cache hit.
[2023-03-19 18:13:35] [INFO ] Dead Transitions using invariants and state equation in 2229 ms found 0 transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 12576 ms. Remains : 305/305 places, 7809/7809 transitions.
Graph (trivial) has 5264 edges and 305 vertex of which 38 / 305 are part of one of the 2 SCC in 5 ms
Free SCC test removed 36 places
Drop transitions removed 4264 transitions
Ensure Unique test removed 1182 transitions
Reduce isomorphic transitions removed 5446 transitions.
Drop transitions removed 416 transitions
Redundant transition composition rules discarded 416 transitions
Iterating global reduction 0 with 416 rules applied. Total rules applied 417 place count 269 transition count 1947
Applied a total of 417 rules in 210 ms. Remains 269 /305 variables (removed 36) and now considering 1947/7809 (removed 5862) transitions.
Running SMT prover for 4 properties.
// Phase 1: matrix 1947 rows 269 cols
[2023-03-19 18:13:35] [INFO ] Computed 2 place invariants in 18 ms
[2023-03-19 18:13:36] [INFO ] After 57ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:4
[2023-03-19 18:13:36] [INFO ] [Nat]Absence check using 1 positive place invariants in 0 ms returned sat
[2023-03-19 18:13:36] [INFO ] [Nat]Absence check using 1 positive and 1 generalized place invariants in 2 ms returned sat
[2023-03-19 18:13:36] [INFO ] After 743ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :4
[2023-03-19 18:13:36] [INFO ] State equation strengthened by 504 read => feed constraints.
[2023-03-19 18:13:37] [INFO ] After 890ms SMT Verify possible using 504 Read/Feed constraints in natural domain returned unsat :0 sat :4
[2023-03-19 18:13:38] [INFO ] After 1380ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :4
Attempting to minimize the solution found.
Minimization took 211 ms.
[2023-03-19 18:13:38] [INFO ] After 2421ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :4
Successfully simplified 1 atomic propositions for a total of 5 simplifications.
FORMULA Szymanski-PT-b04-LTLCardinality-10 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Computed a total of 11 stabilizing places and 2304 stable transitions
Running Spot : '/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.ltl.spot.binaries_1.0.0.202303021504/bin/ltl2tgba-linux64' '--check=stutter' '--hoaf=tv' '-f' '!(X(G(p0)))'
Support contains 2 out of 305 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 305/305 places, 7936/7936 transitions.
Applied a total of 0 rules in 27 ms. Remains 305 /305 variables (removed 0) and now considering 7936/7936 (removed 0) transitions.
[2023-03-19 18:13:38] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
// Phase 1: matrix 2732 rows 305 cols
[2023-03-19 18:13:38] [INFO ] Computed 1 place invariants in 20 ms
[2023-03-19 18:13:39] [INFO ] Implicit Places using invariants in 446 ms returned []
[2023-03-19 18:13:39] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:13:39] [INFO ] Invariant cache hit.
[2023-03-19 18:13:39] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-19 18:13:46] [INFO ] Implicit Places using invariants and state equation in 7283 ms returned []
Implicit Place search using SMT with State Equation took 7733 ms to find 0 implicit places.
[2023-03-19 18:13:46] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:13:46] [INFO ] Invariant cache hit.
[2023-03-19 18:13:48] [INFO ] Dead Transitions using invariants and state equation in 2190 ms found 0 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 9955 ms. Remains : 305/305 places, 7936/7936 transitions.
Stuttering acceptance computed with spot in 207 ms :[true, (NOT p0), (NOT p0)]
Running random walk in product with property : Szymanski-PT-b04-LTLCardinality-08 automaton TGBA Formula[mat=[[{ cond=true, acceptance={0} source=0 dest: 0}], [{ cond=true, acceptance={} source=1 dest: 2}], [{ cond=(NOT p0), acceptance={} source=2 dest: 0}, { cond=p0, acceptance={} source=2 dest: 2}]], initial=1, aps=[p0:(GT s188 s41)], nbAcceptance=1, properties=[trans-labels, explicit-labels, trans-acc, complete, deterministic, no-univ-branch, unambiguous, semi-deterministic, stutter-sensitive, terminal, very-weak, weak, inherently-weak], stateDesc=[null, null, null][false, false, false]]
Entered a terminal (fully accepting) state of product in 1 steps with 0 reset in 2 ms.
FORMULA Szymanski-PT-b04-LTLCardinality-08 FALSE TECHNIQUES STUTTER_TEST
Treatment of property Szymanski-PT-b04-LTLCardinality-08 finished in 10240 ms.
Running Spot : '/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.ltl.spot.binaries_1.0.0.202303021504/bin/ltl2tgba-linux64' '--check=stutter' '--hoaf=tv' '-f' '!(X(X(X((F(p0)||G(p1))))))'
Support contains 2 out of 305 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 305/305 places, 7936/7936 transitions.
Applied a total of 0 rules in 29 ms. Remains 305 /305 variables (removed 0) and now considering 7936/7936 (removed 0) transitions.
[2023-03-19 18:13:48] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:13:48] [INFO ] Invariant cache hit.
[2023-03-19 18:13:49] [INFO ] Implicit Places using invariants in 445 ms returned []
[2023-03-19 18:13:49] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:13:49] [INFO ] Invariant cache hit.
[2023-03-19 18:13:49] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-19 18:13:57] [INFO ] Implicit Places using invariants and state equation in 8139 ms returned []
Implicit Place search using SMT with State Equation took 8588 ms to find 0 implicit places.
[2023-03-19 18:13:57] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:13:57] [INFO ] Invariant cache hit.
[2023-03-19 18:13:59] [INFO ] Dead Transitions using invariants and state equation in 2118 ms found 0 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 10737 ms. Remains : 305/305 places, 7936/7936 transitions.
Stuttering acceptance computed with spot in 206 ms :[(NOT p0), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1))]
Running random walk in product with property : Szymanski-PT-b04-LTLCardinality-09 automaton TGBA Formula[mat=[[{ cond=(NOT p0), acceptance={0} source=0 dest: 0}], [{ cond=(AND (NOT p0) (NOT p1)), acceptance={} source=1 dest: 0}, { cond=(AND (NOT p0) p1), acceptance={} source=1 dest: 1}], [{ cond=true, acceptance={} source=2 dest: 1}], [{ cond=true, acceptance={} source=3 dest: 4}], [{ cond=true, acceptance={} source=4 dest: 2}]], initial=3, aps=[p0:(GT s0 0), p1:(LEQ s193 0)], nbAcceptance=1, properties=[trans-labels, explicit-labels, trans-acc, deterministic, no-univ-branch, unambiguous, semi-deterministic, stutter-sensitive, very-weak, weak, inherently-weak], stateDesc=[null, null, null, null, null][false, false, false, false, false]]
Product exploration explored 100000 steps with 8 reset in 586 ms.
Product exploration explored 100000 steps with 0 reset in 484 ms.
Computed a total of 11 stabilizing places and 2304 stable transitions
Computed a total of 11 stabilizing places and 2304 stable transitions
Knowledge obtained : [(AND p0 p1), true]
False Knowledge obtained : []
Knowledge based reduction with 2 factoid took 98 ms. Reduced automaton from 5 states, 6 edges and 2 AP (stutter sensitive) to 5 states, 6 edges and 2 AP (stutter sensitive).
Stuttering acceptance computed with spot in 230 ms :[(NOT p0), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1))]
Incomplete random walk after 10002 steps, including 2 resets, run finished after 33 ms. (steps per millisecond=303 ) properties (out of 3) seen :2
Finished Best-First random walk after 195 steps, including 0 resets, run visited all 1 properties in 2 ms. (steps per millisecond=97 )
Knowledge obtained : [(AND p0 p1), true]
False Knowledge obtained : [(F (NOT p0)), (F (AND (NOT p0) p1)), (F (AND (NOT p0) (NOT p1)))]
Knowledge based reduction with 2 factoid took 141 ms. Reduced automaton from 5 states, 6 edges and 2 AP (stutter sensitive) to 5 states, 6 edges and 2 AP (stutter sensitive).
Stuttering acceptance computed with spot in 186 ms :[(NOT p0), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1))]
Stuttering acceptance computed with spot in 196 ms :[(NOT p0), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1))]
Support contains 2 out of 305 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 305/305 places, 7936/7936 transitions.
Applied a total of 0 rules in 28 ms. Remains 305 /305 variables (removed 0) and now considering 7936/7936 (removed 0) transitions.
[2023-03-19 18:14:01] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:01] [INFO ] Invariant cache hit.
[2023-03-19 18:14:02] [INFO ] Implicit Places using invariants in 440 ms returned []
[2023-03-19 18:14:02] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:02] [INFO ] Invariant cache hit.
[2023-03-19 18:14:02] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-19 18:14:10] [INFO ] Implicit Places using invariants and state equation in 8196 ms returned []
Implicit Place search using SMT with State Equation took 8658 ms to find 0 implicit places.
[2023-03-19 18:14:10] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:10] [INFO ] Invariant cache hit.
[2023-03-19 18:14:12] [INFO ] Dead Transitions using invariants and state equation in 2039 ms found 0 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 10728 ms. Remains : 305/305 places, 7936/7936 transitions.
Computed a total of 11 stabilizing places and 2304 stable transitions
Computed a total of 11 stabilizing places and 2304 stable transitions
Knowledge obtained : [(AND p0 p1), true]
False Knowledge obtained : []
Knowledge based reduction with 2 factoid took 88 ms. Reduced automaton from 5 states, 6 edges and 2 AP (stutter sensitive) to 5 states, 6 edges and 2 AP (stutter sensitive).
Stuttering acceptance computed with spot in 213 ms :[(NOT p0), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1))]
Incomplete random walk after 10000 steps, including 2 resets, run finished after 35 ms. (steps per millisecond=285 ) properties (out of 3) seen :2
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 22 ms. (steps per millisecond=454 ) properties (out of 1) seen :0
Running SMT prover for 1 properties.
[2023-03-19 18:14:12] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:12] [INFO ] Invariant cache hit.
[2023-03-19 18:14:13] [INFO ] After 51ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0 real:1
[2023-03-19 18:14:13] [INFO ] [Nat]Absence check using 0 positive and 1 generalized place invariants in 2 ms returned sat
[2023-03-19 18:14:13] [INFO ] After 755ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :1
[2023-03-19 18:14:13] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-19 18:14:15] [INFO ] After 1311ms SMT Verify possible using 147 Read/Feed constraints in natural domain returned unsat :0 sat :1
[2023-03-19 18:14:15] [INFO ] After 1592ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :1
Attempting to minimize the solution found.
Minimization took 119 ms.
[2023-03-19 18:14:15] [INFO ] After 2545ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :1
Parikh walk visited 0 properties in 11 ms.
Support contains 2 out of 305 places. Attempting structural reductions.
Starting structural reductions in REACHABILITY mode, iteration 0 : 305/305 places, 7936/7936 transitions.
Drop transitions removed 126 transitions
Reduce isomorphic transitions removed 126 transitions.
Iterating post reduction 0 with 126 rules applied. Total rules applied 126 place count 305 transition count 7810
Applied a total of 126 rules in 194 ms. Remains 305 /305 variables (removed 0) and now considering 7810/7936 (removed 126) transitions.
Finished structural reductions in REACHABILITY mode , in 1 iterations and 195 ms. Remains : 305/305 places, 7810/7936 transitions.
Incomplete random walk after 10002 steps, including 2 resets, run finished after 24 ms. (steps per millisecond=416 ) properties (out of 1) seen :0
Finished Best-First random walk after 3568 steps, including 1 resets, run visited all 1 properties in 7 ms. (steps per millisecond=509 )
Knowledge obtained : [(AND p0 p1), true]
False Knowledge obtained : [(F (NOT p0)), (F (AND (NOT p0) p1)), (F (AND (NOT p0) (NOT p1)))]
Knowledge based reduction with 2 factoid took 140 ms. Reduced automaton from 5 states, 6 edges and 2 AP (stutter sensitive) to 5 states, 6 edges and 2 AP (stutter sensitive).
Stuttering acceptance computed with spot in 191 ms :[(NOT p0), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1))]
Stuttering acceptance computed with spot in 189 ms :[(NOT p0), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1))]
Stuttering acceptance computed with spot in 192 ms :[(NOT p0), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1))]
Product exploration explored 100000 steps with 5 reset in 419 ms.
Product exploration explored 100000 steps with 1 reset in 465 ms.
Applying partial POR strategy [true, true, false, false, false]
Stuttering acceptance computed with spot in 203 ms :[(NOT p0), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1)), (AND (NOT p0) (NOT p1))]
Support contains 2 out of 305 places. Attempting structural reductions.
Starting structural reductions in SI_LTL mode, iteration 0 : 305/305 places, 7936/7936 transitions.
Applied a total of 0 rules in 389 ms. Remains 305 /305 variables (removed 0) and now considering 7936/7936 (removed 0) transitions.
[2023-03-19 18:14:19] [INFO ] Redundant transitions in 844 ms returned []
[2023-03-19 18:14:19] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:19] [INFO ] Invariant cache hit.
[2023-03-19 18:14:21] [INFO ] Dead Transitions using invariants and state equation in 1995 ms found 0 transitions.
Finished structural reductions in SI_LTL mode , in 1 iterations and 3245 ms. Remains : 305/305 places, 7936/7936 transitions.
Support contains 2 out of 305 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 305/305 places, 7936/7936 transitions.
Applied a total of 0 rules in 30 ms. Remains 305 /305 variables (removed 0) and now considering 7936/7936 (removed 0) transitions.
[2023-03-19 18:14:21] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:21] [INFO ] Invariant cache hit.
[2023-03-19 18:14:21] [INFO ] Implicit Places using invariants in 433 ms returned []
[2023-03-19 18:14:21] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:21] [INFO ] Invariant cache hit.
[2023-03-19 18:14:22] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-19 18:14:29] [INFO ] Implicit Places using invariants and state equation in 8212 ms returned []
Implicit Place search using SMT with State Equation took 8647 ms to find 0 implicit places.
[2023-03-19 18:14:29] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:29] [INFO ] Invariant cache hit.
[2023-03-19 18:14:31] [INFO ] Dead Transitions using invariants and state equation in 2139 ms found 0 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 10822 ms. Remains : 305/305 places, 7936/7936 transitions.
Treatment of property Szymanski-PT-b04-LTLCardinality-09 finished in 43594 ms.
Running Spot : '/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.ltl.spot.binaries_1.0.0.202303021504/bin/ltl2tgba-linux64' '--check=stutter' '--hoaf=tv' '-f' '!(F(p0))'
Support contains 1 out of 305 places. Attempting structural reductions.
Starting structural reductions in SI_LTL mode, iteration 0 : 305/305 places, 7936/7936 transitions.
Applied a total of 0 rules in 214 ms. Remains 305 /305 variables (removed 0) and now considering 7936/7936 (removed 0) transitions.
[2023-03-19 18:14:32] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:32] [INFO ] Invariant cache hit.
[2023-03-19 18:14:33] [INFO ] Implicit Places using invariants in 439 ms returned []
[2023-03-19 18:14:33] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:33] [INFO ] Invariant cache hit.
[2023-03-19 18:14:33] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-19 18:14:40] [INFO ] Implicit Places using invariants and state equation in 7502 ms returned []
Implicit Place search using SMT with State Equation took 7944 ms to find 0 implicit places.
[2023-03-19 18:14:41] [INFO ] Redundant transitions in 659 ms returned []
[2023-03-19 18:14:41] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:41] [INFO ] Invariant cache hit.
[2023-03-19 18:14:43] [INFO ] Dead Transitions using invariants and state equation in 1995 ms found 0 transitions.
Finished structural reductions in SI_LTL mode , in 1 iterations and 10829 ms. Remains : 305/305 places, 7936/7936 transitions.
Stuttering acceptance computed with spot in 37 ms :[(NOT p0)]
Running random walk in product with property : Szymanski-PT-b04-LTLCardinality-12 automaton TGBA Formula[mat=[[{ cond=(NOT p0), acceptance={0} source=0 dest: 0}]], initial=0, aps=[p0:(GT s240 0)], nbAcceptance=1, properties=[trans-labels, explicit-labels, trans-acc, colored, deterministic, no-univ-branch, unambiguous, semi-deterministic, stutter-invariant, very-weak, weak, inherently-weak], stateDesc=[null][true]]
Stuttering criterion allowed to conclude after 197 steps with 0 reset in 3 ms.
FORMULA Szymanski-PT-b04-LTLCardinality-12 FALSE TECHNIQUES STUTTER_TEST
Treatment of property Szymanski-PT-b04-LTLCardinality-12 finished in 10909 ms.
Running Spot : '/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.ltl.spot.binaries_1.0.0.202303021504/bin/ltl2tgba-linux64' '--check=stutter' '--hoaf=tv' '-f' '!((F(p0)&&X(X(G(p1)))))'
Support contains 3 out of 305 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 305/305 places, 7936/7936 transitions.
Applied a total of 0 rules in 27 ms. Remains 305 /305 variables (removed 0) and now considering 7936/7936 (removed 0) transitions.
[2023-03-19 18:14:43] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:43] [INFO ] Invariant cache hit.
[2023-03-19 18:14:43] [INFO ] Implicit Places using invariants in 440 ms returned []
[2023-03-19 18:14:43] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:43] [INFO ] Invariant cache hit.
[2023-03-19 18:14:44] [INFO ] State equation strengthened by 147 read => feed constraints.
[2023-03-19 18:14:51] [INFO ] Implicit Places using invariants and state equation in 7677 ms returned []
Implicit Place search using SMT with State Equation took 8124 ms to find 0 implicit places.
[2023-03-19 18:14:51] [INFO ] Flow matrix only has 2732 transitions (discarded 5204 similar events)
[2023-03-19 18:14:51] [INFO ] Invariant cache hit.
[2023-03-19 18:14:53] [INFO ] Dead Transitions using invariants and state equation in 2054 ms found 0 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 10207 ms. Remains : 305/305 places, 7936/7936 transitions.
Stuttering acceptance computed with spot in 175 ms :[(OR (NOT p1) (NOT p0)), (NOT p0), (NOT p1), (NOT p1), true]
Running random walk in product with property : Szymanski-PT-b04-LTLCardinality-14 automaton TGBA Formula[mat=[[{ cond=(NOT p0), acceptance={} source=0 dest: 1}, { cond=true, acceptance={} source=0 dest: 2}], [{ cond=(NOT p0), acceptance={0} source=1 dest: 1}], [{ cond=true, acceptance={} source=2 dest: 3}], [{ cond=p1, acceptance={} source=3 dest: 3}, { cond=(NOT p1), acceptance={} source=3 dest: 4}], [{ cond=true, acceptance={0} source=4 dest: 4}]], initial=0, aps=[p0:(LEQ s177 s146), p1:(LEQ 1 s249)], nbAcceptance=1, properties=[trans-labels, explicit-labels, trans-acc, no-univ-branch, stutter-sensitive, very-weak, weak, inherently-weak], stateDesc=[null, null, null, null, null][false, false, false, false, false]]
Entered a terminal (fully accepting) state of product in 2 steps with 0 reset in 0 ms.
FORMULA Szymanski-PT-b04-LTLCardinality-14 FALSE TECHNIQUES STUTTER_TEST
Treatment of property Szymanski-PT-b04-LTLCardinality-14 finished in 10414 ms.
Running Spot : '/home/mcc/BenchKit/itstools/itstools/plugins/fr.lip6.ltl.spot.binaries_1.0.0.202303021504/bin/ltl2tgba-linux64' '--check=stutter' '--hoaf=tv' '-f' '!(X(X(X((F(p0)||G(p1))))))'
[2023-03-19 18:14:54] [INFO ] Flatten gal took : 212 ms
[2023-03-19 18:14:54] [INFO ] Export to MCC of 1 properties in file /home/mcc/execution/LTLCardinality.sr.xml took 1 ms.
[2023-03-19 18:14:54] [INFO ] Export to PNML in file /home/mcc/execution/model.sr.pnml of net with 305 places, 7936 transitions and 31616 arcs took 49 ms.
Total runtime 140711 ms.
There are residual formulas that ITS could not solve within timeout
pnml2lts-mc model.pnml -s80% --procs=4 --ltl=/tmp/868/ltl_0_ --buchi-type=spotba --strategy=ufscc --ltl-semantics=spin --state=tree
Could not compute solution for formula : Szymanski-PT-b04-LTLCardinality-09
BK_STOP 1679249696244
--------------------
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_1.0.0.202303021504.jar
+ VERSION=202303021504
+ echo 'Running Version 202303021504'
+ /home/mcc/BenchKit/bin//../reducer/bin//../../itstools//itstools/its-tools -pnfolder /home/mcc/execution -examination LTLCardinality -timeout 360 -rebuildPNML
mcc2023
ltl formula name Szymanski-PT-b04-LTLCardinality-09
ltl formula formula --ltl=/tmp/868/ltl_0_
pnml2lts-mc: =============================================================================
pnml2lts-mc: Runtime environment could only preallocate 15 GB while requesting 240 GB.
pnml2lts-mc: Configure your system limits to exploit all memory.
pnml2lts-mc: =============================================================================
pnml2lts-mc( 0/ 4): Loading model from model.pnml
pnml2lts-mc( 0/ 4): Edge label is id
Warning: program compiled against libxml 210 using older 209
Warning: program compiled against libxml 210 using older 209
Warning: program compiled against libxml 210 using older 209
Warning: program compiled against libxml 210 using older 209
pnml2lts-mc( 0/ 4): Petri net has 305 places, 7936 transitions and 31616 arcs
pnml2lts-mc( 0/ 4): Petri net Petri analyzed
pnml2lts-mc( 0/ 4): There are no safe places
pnml2lts-mc( 0/ 4): Loading Petri net took 0.780 real 0.260 user 0.290 sys
pnml2lts-mc( 2/ 4): LTL layer: formula: /tmp/868/ltl_0_
pnml2lts-mc( 1/ 4): LTL layer: formula: /tmp/868/ltl_0_
pnml2lts-mc( 0/ 4): LTL layer: formula: /tmp/868/ltl_0_
pnml2lts-mc( 3/ 4): LTL layer: formula: /tmp/868/ltl_0_
pnml2lts-mc( 0/ 4): buchi has 5 states
pnml2lts-mc( 0/ 4): Weak Buchi automaton detected, adding non-accepting as progress label.
pnml2lts-mc( 0/ 4), ** error **: area memory exhausted
double free or corruption (fasttop)
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="Szymanski-PT-b04"
export BK_EXAMINATION="LTLCardinality"
export BK_TOOL="ltsminxred"
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 ltsminxred"
echo " Input is Szymanski-PT-b04, examination is LTLCardinality"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r489-tall-167912706800459"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"
tar xzf /home/mcc/BenchKit/INPUTS/Szymanski-PT-b04.tgz
mv Szymanski-PT-b04 execution
cd execution
if [ "LTLCardinality" = "ReachabilityDeadlock" ] || [ "LTLCardinality" = "UpperBounds" ] || [ "LTLCardinality" = "QuasiLiveness" ] || [ "LTLCardinality" = "StableMarking" ] || [ "LTLCardinality" = "Liveness" ] || [ "LTLCardinality" = "OneSafe" ] || [ "LTLCardinality" = "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 [ "LTLCardinality" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "LTLCardinality" != "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 "LTLCardinality.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property LTLCardinality.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "LTLCardinality.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 [ "LTLCardinality" = "ReachabilityDeadlock" ] || [ "LTLCardinality" = "QuasiLiveness" ] || [ "LTLCardinality" = "StableMarking" ] || [ "LTLCardinality" = "Liveness" ] || [ "LTLCardinality" = "OneSafe" ] ; then
echo "FORMULA_NAME LTLCardinality"
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 ;