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-167912706700403.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-a02, examination is LTLCardinality
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r489-tall-167912706700403
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 556K
-rw-r--r-- 1 mcc users 7.4K Feb 26 16:57 CTLCardinality.txt
-rw-r--r-- 1 mcc users 85K Feb 26 16:57 CTLCardinality.xml
-rw-r--r-- 1 mcc users 3.9K Feb 26 16:55 CTLFireability.txt
-rw-r--r-- 1 mcc users 29K Feb 26 16:55 CTLFireability.xml
-rw-r--r-- 1 mcc users 3.6K Feb 25 17:18 LTLCardinality.txt
-rw-r--r-- 1 mcc users 26K Feb 25 17:18 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.2K Feb 25 17:18 LTLFireability.txt
-rw-r--r-- 1 mcc users 18K Feb 25 17:18 LTLFireability.xml
-rw-r--r-- 1 mcc users 13K Feb 26 16:58 ReachabilityCardinality.txt
-rw-r--r-- 1 mcc users 137K Feb 26 16:58 ReachabilityCardinality.xml
-rw-r--r-- 1 mcc users 8.7K Feb 26 16:57 ReachabilityFireability.txt
-rw-r--r-- 1 mcc users 76K Feb 26 16:57 ReachabilityFireability.xml
-rw-r--r-- 1 mcc users 1.6K Feb 25 17:18 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.6K Feb 25 17:18 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 101K 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-a02-LTLCardinality-00
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-01
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-02
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-03
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-04
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-05
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-06
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-07
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-08
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-09
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-10
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-11
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-12
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-13
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-14
FORMULA_NAME Szymanski-PT-a02-LTLCardinality-15

=== Now, execution of the tool begins

BK_START 1679242752367

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-a02
Applying reductions before tool ltsmin
Invoking reducer
Running Version 202303021504
[2023-03-19 16:19:14] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, LTLCardinality, -timeout, 360, -rebuildPNML]
[2023-03-19 16:19:14] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2023-03-19 16:19:14] [INFO ] Load time of PNML (sax parser for PT used): 61 ms
[2023-03-19 16:19:14] [INFO ] Transformed 61 places.
[2023-03-19 16:19:14] [INFO ] Transformed 224 transitions.
[2023-03-19 16:19:14] [INFO ] Parsed PT model containing 61 places and 224 transitions and 900 arcs in 138 ms.
Parsed 16 properties from file /home/mcc/execution/LTLCardinality.xml in 9 ms.
Working with output stream class java.io.PrintStream
Initial state reduction rules removed 5 formulas.
Deduced a syphon composed of 12 places in 1 ms
Reduce places removed 12 places and 8 transitions.
FORMULA Szymanski-PT-a02-LTLCardinality-00 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-a02-LTLCardinality-02 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-a02-LTLCardinality-09 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-a02-LTLCardinality-10 TRUE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-a02-LTLCardinality-11 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA Szymanski-PT-a02-LTLCardinality-15 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Support contains 21 out of 49 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 49/49 places, 216/216 transitions.
Reduce places removed 2 places and 0 transitions.
Iterating post reduction 0 with 2 rules applied. Total rules applied 2 place count 47 transition count 216
Discarding 1 places :
Symmetric choice reduction at 1 with 1 rule applications. Total rules 3 place count 46 transition count 212
Iterating global reduction 1 with 1 rules applied. Total rules applied 4 place count 46 transition count 212
Applied a total of 4 rules in 20 ms. Remains 46 /49 variables (removed 3) and now considering 212/216 (removed 4) transitions.
[2023-03-19 16:19:14] [INFO ] Flow matrix only has 78 transitions (discarded 134 similar events)
// Phase 1: matrix 78 rows 46 cols
[2023-03-19 16:19:14] [INFO ] Computed 1 place invariants in 8 ms
[2023-03-19 16:19:14] [INFO ] Implicit Places using invariants in 183 ms returned []
[2023-03-19 16:19:14] [INFO ] Flow matrix only has 78 transitions (discarded 134 similar events)
[2023-03-19 16:19:14] [INFO ] Invariant cache hit.
[2023-03-19 16:19:14] [INFO ] State equation strengthened by 9 read => feed constraints.
[2023-03-19 16:19:14] [INFO ] Implicit Places using invariants and state equation in 85 ms returned []
Implicit Place search using SMT with State Equation took 298 ms to find 0 implicit places.
[2023-03-19 16:19:14] [INFO ] Flow matrix only has 78 transitions (discarded 134 similar events)
[2023-03-19 16:19:14] [INFO ] Invariant cache hit.
[2023-03-19 16:19:14] [INFO ] Dead Transitions using invariants and state equation in 96 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 46/49 places, 212/216 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 416 ms. Remains : 46/49 places, 212/216 transitions.
Support contains 21 out of 46 places after structural reductions.
[2023-03-19 16:19:15] [INFO ] Flatten gal took : 51 ms
[2023-03-19 16:19:15] [INFO ] Flatten gal took : 36 ms
[2023-03-19 16:19:15] [INFO ] Input system was already deterministic with 212 transitions.
Support contains 18 out of 46 places (down from 21) after GAL structural reductions.
Incomplete random walk after 10000 steps, including 36 resets, run finished after 73 ms. (steps per millisecond=136 ) properties (out of 14) seen :13
Incomplete Best-First random walk after 10001 steps, including 2 resets, run finished after 21 ms. (steps per millisecond=476 ) properties (out of 1) seen :0
Running SMT prover for 1 properties.
[2023-03-19 16:19:15] [INFO ] Flow matrix only has 78 transitions (discarded 134 similar events)
[2023-03-19 16:19:15] [INFO ] Invariant cache hit.
[2023-03-19 16:19:15] [INFO ] [Real]Absence check using 0 positive and 1 generalized place invariants in 2 ms returned sat
[2023-03-19 16:19:15] [INFO ] After 75ms SMT Verify possible using all constraints in real domain returned unsat :1 sat :0
Fused 1 Parikh solutions to 0 different solutions.
Parikh walk visited 0 properties in 1 ms.
Successfully simplified 1 atomic propositions for a total of 10 simplifications.
FORMULA Szymanski-PT-a02-LTLCardinality-05 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Computed a total of 9 stabilizing places and 36 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' '!(F(G(p0)))'
Support contains 2 out of 46 places. Attempting structural reductions.
Starting structural reductions in SI_LTL mode, iteration 0 : 46/46 places, 212/212 transitions.
Discarding 4 places :
Symmetric choice reduction at 0 with 4 rule applications. Total rules 4 place count 42 transition count 196
Iterating global reduction 0 with 4 rules applied. Total rules applied 8 place count 42 transition count 196
Drop transitions removed 16 transitions
Redundant transition composition rules discarded 16 transitions
Iterating global reduction 0 with 16 rules applied. Total rules applied 24 place count 42 transition count 180
Discarding 1 places :
Symmetric choice reduction at 0 with 1 rule applications. Total rules 25 place count 41 transition count 176
Iterating global reduction 0 with 1 rules applied. Total rules applied 26 place count 41 transition count 176
Applied a total of 26 rules in 30 ms. Remains 41 /46 variables (removed 5) and now considering 176/212 (removed 36) transitions.
[2023-03-19 16:19:15] [INFO ] Flow matrix only has 69 transitions (discarded 107 similar events)
// Phase 1: matrix 69 rows 41 cols
[2023-03-19 16:19:15] [INFO ] Computed 1 place invariants in 1 ms
[2023-03-19 16:19:15] [INFO ] Implicit Places using invariants in 50 ms returned []
[2023-03-19 16:19:15] [INFO ] Flow matrix only has 69 transitions (discarded 107 similar events)
[2023-03-19 16:19:15] [INFO ] Invariant cache hit.
[2023-03-19 16:19:15] [INFO ] State equation strengthened by 9 read => feed constraints.
[2023-03-19 16:19:15] [INFO ] Implicit Places using invariants and state equation in 75 ms returned []
Implicit Place search using SMT with State Equation took 127 ms to find 0 implicit places.
[2023-03-19 16:19:15] [INFO ] Redundant transitions in 5 ms returned []
[2023-03-19 16:19:15] [INFO ] Flow matrix only has 69 transitions (discarded 107 similar events)
[2023-03-19 16:19:15] [INFO ] Invariant cache hit.
[2023-03-19 16:19:15] [INFO ] Dead Transitions using invariants and state equation in 81 ms found 0 transitions.
Starting structural reductions in SI_LTL mode, iteration 1 : 41/46 places, 176/212 transitions.
Finished structural reductions in SI_LTL mode , in 1 iterations and 249 ms. Remains : 41/46 places, 176/212 transitions.
Stuttering acceptance computed with spot in 161 ms :[(NOT p0)]
Running random walk in product with property : Szymanski-PT-a02-LTLCardinality-01 automaton TGBA Formula[mat=[[{ cond=p0, acceptance={} source=0 dest: 0}, { cond=(NOT p0), acceptance={0} source=0 dest: 0}]], initial=0, aps=[p0:(LEQ s17 s15)], nbAcceptance=1, properties=[trans-labels, explicit-labels, trans-acc, complete, deterministic, no-univ-branch, unambiguous, semi-deterministic, stutter-invariant], stateDesc=[null][true]]
Stuttering criterion allowed to conclude after 4176 steps with 20 reset in 41 ms.
FORMULA Szymanski-PT-a02-LTLCardinality-01 FALSE TECHNIQUES STUTTER_TEST
Treatment of property Szymanski-PT-a02-LTLCardinality-01 finished in 500 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(F(p0)))'
Support contains 1 out of 46 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 46/46 places, 212/212 transitions.
Discarding 4 places :
Symmetric choice reduction at 0 with 4 rule applications. Total rules 4 place count 42 transition count 196
Iterating global reduction 0 with 4 rules applied. Total rules applied 8 place count 42 transition count 196
Applied a total of 8 rules in 5 ms. Remains 42 /46 variables (removed 4) and now considering 196/212 (removed 16) transitions.
[2023-03-19 16:19:16] [INFO ] Flow matrix only has 74 transitions (discarded 122 similar events)
// Phase 1: matrix 74 rows 42 cols
[2023-03-19 16:19:16] [INFO ] Computed 1 place invariants in 11 ms
[2023-03-19 16:19:16] [INFO ] Implicit Places using invariants in 70 ms returned []
[2023-03-19 16:19:16] [INFO ] Flow matrix only has 74 transitions (discarded 122 similar events)
[2023-03-19 16:19:16] [INFO ] Invariant cache hit.
[2023-03-19 16:19:16] [INFO ] State equation strengthened by 9 read => feed constraints.
[2023-03-19 16:19:16] [INFO ] Implicit Places using invariants and state equation in 74 ms returned []
Implicit Place search using SMT with State Equation took 145 ms to find 0 implicit places.
[2023-03-19 16:19:16] [INFO ] Flow matrix only has 74 transitions (discarded 122 similar events)
[2023-03-19 16:19:16] [INFO ] Invariant cache hit.
[2023-03-19 16:19:16] [INFO ] Dead Transitions using invariants and state equation in 94 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 42/46 places, 196/212 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 247 ms. Remains : 42/46 places, 196/212 transitions.
Stuttering acceptance computed with spot in 87 ms :[(NOT p0), (NOT p0)]
Running random walk in product with property : Szymanski-PT-a02-LTLCardinality-03 automaton TGBA Formula[mat=[[{ cond=true, acceptance={} source=0 dest: 1}], [{ cond=(NOT p0), acceptance={0} source=1 dest: 1}]], initial=0, aps=[p0:(LEQ 1 s37)], 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][false, false]]
Product exploration explored 100000 steps with 1925 reset in 344 ms.
Stack based approach found an accepted trace after 14 steps with 0 reset with depth 15 and stack size 15 in 0 ms.
FORMULA Szymanski-PT-a02-LTLCardinality-03 FALSE TECHNIQUES STACK_TEST
Treatment of property Szymanski-PT-a02-LTLCardinality-03 finished in 697 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 2 out of 46 places. Attempting structural reductions.
Starting structural reductions in SI_LTL mode, iteration 0 : 46/46 places, 212/212 transitions.
Discarding 3 places :
Symmetric choice reduction at 0 with 3 rule applications. Total rules 3 place count 43 transition count 200
Iterating global reduction 0 with 3 rules applied. Total rules applied 6 place count 43 transition count 200
Drop transitions removed 16 transitions
Redundant transition composition rules discarded 16 transitions
Iterating global reduction 0 with 16 rules applied. Total rules applied 22 place count 43 transition count 184
Discarding 2 places :
Symmetric choice reduction at 0 with 2 rule applications. Total rules 24 place count 41 transition count 176
Iterating global reduction 0 with 2 rules applied. Total rules applied 26 place count 41 transition count 176
Applied a total of 26 rules in 28 ms. Remains 41 /46 variables (removed 5) and now considering 176/212 (removed 36) transitions.
[2023-03-19 16:19:16] [INFO ] Flow matrix only has 69 transitions (discarded 107 similar events)
// Phase 1: matrix 69 rows 41 cols
[2023-03-19 16:19:16] [INFO ] Computed 1 place invariants in 1 ms
[2023-03-19 16:19:16] [INFO ] Implicit Places using invariants in 44 ms returned []
[2023-03-19 16:19:16] [INFO ] Flow matrix only has 69 transitions (discarded 107 similar events)
[2023-03-19 16:19:16] [INFO ] Invariant cache hit.
[2023-03-19 16:19:16] [INFO ] State equation strengthened by 9 read => feed constraints.
[2023-03-19 16:19:16] [INFO ] Implicit Places using invariants and state equation in 83 ms returned []
Implicit Place search using SMT with State Equation took 129 ms to find 0 implicit places.
[2023-03-19 16:19:16] [INFO ] Redundant transitions in 5 ms returned []
[2023-03-19 16:19:16] [INFO ] Flow matrix only has 69 transitions (discarded 107 similar events)
[2023-03-19 16:19:16] [INFO ] Invariant cache hit.
[2023-03-19 16:19:16] [INFO ] Dead Transitions using invariants and state equation in 67 ms found 0 transitions.
Starting structural reductions in SI_LTL mode, iteration 1 : 41/46 places, 176/212 transitions.
Finished structural reductions in SI_LTL mode , in 1 iterations and 238 ms. Remains : 41/46 places, 176/212 transitions.
Stuttering acceptance computed with spot in 42 ms :[(NOT p0)]
Running random walk in product with property : Szymanski-PT-a02-LTLCardinality-04 automaton TGBA Formula[mat=[[{ cond=(NOT p0), acceptance={0} source=0 dest: 0}]], initial=0, aps=[p0:(GT s40 s24)], 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 983 steps with 10 reset in 8 ms.
FORMULA Szymanski-PT-a02-LTLCardinality-04 FALSE TECHNIQUES STUTTER_TEST
Treatment of property Szymanski-PT-a02-LTLCardinality-04 finished in 305 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(G(p0)))'
Support contains 1 out of 46 places. Attempting structural reductions.
Starting structural reductions in SI_LTL mode, iteration 0 : 46/46 places, 212/212 transitions.
Discarding 4 places :
Symmetric choice reduction at 0 with 4 rule applications. Total rules 4 place count 42 transition count 196
Iterating global reduction 0 with 4 rules applied. Total rules applied 8 place count 42 transition count 196
Drop transitions removed 16 transitions
Redundant transition composition rules discarded 16 transitions
Iterating global reduction 0 with 16 rules applied. Total rules applied 24 place count 42 transition count 180
Discarding 2 places :
Symmetric choice reduction at 0 with 2 rule applications. Total rules 26 place count 40 transition count 172
Iterating global reduction 0 with 2 rules applied. Total rules applied 28 place count 40 transition count 172
Applied a total of 28 rules in 21 ms. Remains 40 /46 variables (removed 6) and now considering 172/212 (removed 40) transitions.
[2023-03-19 16:19:17] [INFO ] Flow matrix only has 68 transitions (discarded 104 similar events)
// Phase 1: matrix 68 rows 40 cols
[2023-03-19 16:19:17] [INFO ] Computed 1 place invariants in 0 ms
[2023-03-19 16:19:17] [INFO ] Implicit Places using invariants in 39 ms returned []
[2023-03-19 16:19:17] [INFO ] Flow matrix only has 68 transitions (discarded 104 similar events)
[2023-03-19 16:19:17] [INFO ] Invariant cache hit.
[2023-03-19 16:19:17] [INFO ] State equation strengthened by 9 read => feed constraints.
[2023-03-19 16:19:17] [INFO ] Implicit Places using invariants and state equation in 74 ms returned []
Implicit Place search using SMT with State Equation took 113 ms to find 0 implicit places.
[2023-03-19 16:19:17] [INFO ] Redundant transitions in 1 ms returned []
[2023-03-19 16:19:17] [INFO ] Flow matrix only has 68 transitions (discarded 104 similar events)
[2023-03-19 16:19:17] [INFO ] Invariant cache hit.
[2023-03-19 16:19:17] [INFO ] Dead Transitions using invariants and state equation in 68 ms found 0 transitions.
Starting structural reductions in SI_LTL mode, iteration 1 : 40/46 places, 172/212 transitions.
Finished structural reductions in SI_LTL mode , in 1 iterations and 210 ms. Remains : 40/46 places, 172/212 transitions.
Stuttering acceptance computed with spot in 38 ms :[(NOT p0)]
Running random walk in product with property : Szymanski-PT-a02-LTLCardinality-06 automaton TGBA Formula[mat=[[{ cond=p0, acceptance={} source=0 dest: 0}, { cond=(NOT p0), acceptance={0} source=0 dest: 0}]], initial=0, aps=[p0:(LEQ 2 s25)], nbAcceptance=1, properties=[trans-labels, explicit-labels, trans-acc, complete, deterministic, no-univ-branch, unambiguous, semi-deterministic, stutter-invariant], stateDesc=[null][true]]
Stuttering criterion allowed to conclude after 153 steps with 0 reset in 1 ms.
FORMULA Szymanski-PT-a02-LTLCardinality-06 FALSE TECHNIQUES STUTTER_TEST
Treatment of property Szymanski-PT-a02-LTLCardinality-06 finished in 264 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(F(p0))))'
Support contains 1 out of 46 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 46/46 places, 212/212 transitions.
Discarding 4 places :
Symmetric choice reduction at 0 with 4 rule applications. Total rules 4 place count 42 transition count 196
Iterating global reduction 0 with 4 rules applied. Total rules applied 8 place count 42 transition count 196
Applied a total of 8 rules in 6 ms. Remains 42 /46 variables (removed 4) and now considering 196/212 (removed 16) transitions.
[2023-03-19 16:19:17] [INFO ] Flow matrix only has 74 transitions (discarded 122 similar events)
// Phase 1: matrix 74 rows 42 cols
[2023-03-19 16:19:17] [INFO ] Computed 1 place invariants in 4 ms
[2023-03-19 16:19:17] [INFO ] Implicit Places using invariants in 44 ms returned []
[2023-03-19 16:19:17] [INFO ] Flow matrix only has 74 transitions (discarded 122 similar events)
[2023-03-19 16:19:17] [INFO ] Invariant cache hit.
[2023-03-19 16:19:17] [INFO ] State equation strengthened by 9 read => feed constraints.
[2023-03-19 16:19:17] [INFO ] Implicit Places using invariants and state equation in 95 ms returned []
Implicit Place search using SMT with State Equation took 140 ms to find 0 implicit places.
[2023-03-19 16:19:17] [INFO ] Flow matrix only has 74 transitions (discarded 122 similar events)
[2023-03-19 16:19:17] [INFO ] Invariant cache hit.
[2023-03-19 16:19:17] [INFO ] Dead Transitions using invariants and state equation in 71 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 42/46 places, 196/212 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 218 ms. Remains : 42/46 places, 196/212 transitions.
Stuttering acceptance computed with spot in 120 ms :[(NOT p0), (NOT p0), (NOT p0)]
Running random walk in product with property : Szymanski-PT-a02-LTLCardinality-07 automaton TGBA Formula[mat=[[{ cond=(NOT p0), acceptance={0} source=0 dest: 0}], [{ cond=true, acceptance={} source=1 dest: 0}], [{ cond=true, acceptance={} source=2 dest: 1}]], initial=2, aps=[p0:(LEQ 2 s41)], 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][false, false, false]]
Stuttering criterion allowed to conclude after 83 steps with 0 reset in 1 ms.
FORMULA Szymanski-PT-a02-LTLCardinality-07 FALSE TECHNIQUES STUTTER_TEST
Treatment of property Szymanski-PT-a02-LTLCardinality-07 finished in 360 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' '!(G((F(G(p0))&&F(p1))))'
Support contains 2 out of 46 places. Attempting structural reductions.
Starting structural reductions in SI_LTL mode, iteration 0 : 46/46 places, 212/212 transitions.
Discarding 3 places :
Symmetric choice reduction at 0 with 3 rule applications. Total rules 3 place count 43 transition count 200
Iterating global reduction 0 with 3 rules applied. Total rules applied 6 place count 43 transition count 200
Drop transitions removed 16 transitions
Redundant transition composition rules discarded 16 transitions
Iterating global reduction 0 with 16 rules applied. Total rules applied 22 place count 43 transition count 184
Discarding 2 places :
Symmetric choice reduction at 0 with 2 rule applications. Total rules 24 place count 41 transition count 176
Iterating global reduction 0 with 2 rules applied. Total rules applied 26 place count 41 transition count 176
Applied a total of 26 rules in 18 ms. Remains 41 /46 variables (removed 5) and now considering 176/212 (removed 36) transitions.
[2023-03-19 16:19:17] [INFO ] Flow matrix only has 69 transitions (discarded 107 similar events)
// Phase 1: matrix 69 rows 41 cols
[2023-03-19 16:19:17] [INFO ] Computed 1 place invariants in 0 ms
[2023-03-19 16:19:17] [INFO ] Implicit Places using invariants in 42 ms returned []
[2023-03-19 16:19:17] [INFO ] Flow matrix only has 69 transitions (discarded 107 similar events)
[2023-03-19 16:19:17] [INFO ] Invariant cache hit.
[2023-03-19 16:19:17] [INFO ] State equation strengthened by 9 read => feed constraints.
[2023-03-19 16:19:17] [INFO ] Implicit Places using invariants and state equation in 61 ms returned []
Implicit Place search using SMT with State Equation took 105 ms to find 0 implicit places.
[2023-03-19 16:19:17] [INFO ] Redundant transitions in 1 ms returned []
[2023-03-19 16:19:17] [INFO ] Flow matrix only has 69 transitions (discarded 107 similar events)
[2023-03-19 16:19:17] [INFO ] Invariant cache hit.
[2023-03-19 16:19:17] [INFO ] Dead Transitions using invariants and state equation in 64 ms found 0 transitions.
Starting structural reductions in SI_LTL mode, iteration 1 : 41/46 places, 176/212 transitions.
Finished structural reductions in SI_LTL mode , in 1 iterations and 193 ms. Remains : 41/46 places, 176/212 transitions.
Stuttering acceptance computed with spot in 130 ms :[(OR (NOT p0) (NOT p1)), (NOT p0), (NOT p1)]
Running random walk in product with property : Szymanski-PT-a02-LTLCardinality-08 automaton TGBA Formula[mat=[[{ cond=true, acceptance={} source=0 dest: 0}, { cond=(NOT p0), acceptance={} source=0 dest: 1}, { cond=(NOT p1), acceptance={} source=0 dest: 2}], [{ cond=p0, acceptance={} source=1 dest: 1}, { cond=(NOT p0), acceptance={0} source=1 dest: 1}], [{ cond=(NOT p1), acceptance={0} source=2 dest: 2}]], initial=0, aps=[p0:(LEQ 2 s27), p1:(LEQ 2 s21)], nbAcceptance=1, properties=[trans-labels, explicit-labels, trans-acc, no-univ-branch, stutter-invariant], stateDesc=[null, null, null][true, true, true]]
Stuttering criterion allowed to conclude after 362 steps with 1 reset in 1 ms.
FORMULA Szymanski-PT-a02-LTLCardinality-08 FALSE TECHNIQUES STUTTER_TEST
Treatment of property Szymanski-PT-a02-LTLCardinality-08 finished in 341 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(G(p0))))'
Support contains 2 out of 46 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 46/46 places, 212/212 transitions.
Discarding 3 places :
Symmetric choice reduction at 0 with 3 rule applications. Total rules 3 place count 43 transition count 200
Iterating global reduction 0 with 3 rules applied. Total rules applied 6 place count 43 transition count 200
Applied a total of 6 rules in 4 ms. Remains 43 /46 variables (removed 3) and now considering 200/212 (removed 12) transitions.
[2023-03-19 16:19:18] [INFO ] Flow matrix only has 75 transitions (discarded 125 similar events)
// Phase 1: matrix 75 rows 43 cols
[2023-03-19 16:19:18] [INFO ] Computed 1 place invariants in 7 ms
[2023-03-19 16:19:18] [INFO ] Implicit Places using invariants in 48 ms returned []
[2023-03-19 16:19:18] [INFO ] Flow matrix only has 75 transitions (discarded 125 similar events)
[2023-03-19 16:19:18] [INFO ] Invariant cache hit.
[2023-03-19 16:19:18] [INFO ] State equation strengthened by 9 read => feed constraints.
[2023-03-19 16:19:18] [INFO ] Implicit Places using invariants and state equation in 77 ms returned []
Implicit Place search using SMT with State Equation took 128 ms to find 0 implicit places.
[2023-03-19 16:19:18] [INFO ] Flow matrix only has 75 transitions (discarded 125 similar events)
[2023-03-19 16:19:18] [INFO ] Invariant cache hit.
[2023-03-19 16:19:18] [INFO ] Dead Transitions using invariants and state equation in 74 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 43/46 places, 200/212 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 208 ms. Remains : 43/46 places, 200/212 transitions.
Stuttering acceptance computed with spot in 149 ms :[true, (NOT p0), (NOT p0), (NOT p0)]
Running random walk in product with property : Szymanski-PT-a02-LTLCardinality-12 automaton TGBA Formula[mat=[[{ cond=true, acceptance={0} source=0 dest: 0}], [{ cond=(NOT p0), acceptance={} source=1 dest: 0}, { cond=p0, acceptance={} source=1 dest: 1}], [{ cond=true, acceptance={} source=2 dest: 1}], [{ cond=true, acceptance={} source=3 dest: 2}]], initial=3, aps=[p0:(GT s9 s14)], 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, null][false, false, false, false]]
Entered a terminal (fully accepting) state of product in 2 steps with 0 reset in 1 ms.
FORMULA Szymanski-PT-a02-LTLCardinality-12 FALSE TECHNIQUES STUTTER_TEST
Treatment of property Szymanski-PT-a02-LTLCardinality-12 finished in 370 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' '!(G((F(p0)&&X(p1)&&(p2 U p3))))'
Support contains 6 out of 46 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 46/46 places, 212/212 transitions.
Discarding 3 places :
Symmetric choice reduction at 0 with 3 rule applications. Total rules 3 place count 43 transition count 200
Iterating global reduction 0 with 3 rules applied. Total rules applied 6 place count 43 transition count 200
Applied a total of 6 rules in 4 ms. Remains 43 /46 variables (removed 3) and now considering 200/212 (removed 12) transitions.
[2023-03-19 16:19:18] [INFO ] Flow matrix only has 75 transitions (discarded 125 similar events)
// Phase 1: matrix 75 rows 43 cols
[2023-03-19 16:19:18] [INFO ] Computed 1 place invariants in 1 ms
[2023-03-19 16:19:18] [INFO ] Implicit Places using invariants in 43 ms returned []
[2023-03-19 16:19:18] [INFO ] Flow matrix only has 75 transitions (discarded 125 similar events)
[2023-03-19 16:19:18] [INFO ] Invariant cache hit.
[2023-03-19 16:19:18] [INFO ] State equation strengthened by 9 read => feed constraints.
[2023-03-19 16:19:18] [INFO ] Implicit Places using invariants and state equation in 61 ms returned []
Implicit Place search using SMT with State Equation took 104 ms to find 0 implicit places.
[2023-03-19 16:19:18] [INFO ] Flow matrix only has 75 transitions (discarded 125 similar events)
[2023-03-19 16:19:18] [INFO ] Invariant cache hit.
[2023-03-19 16:19:18] [INFO ] Dead Transitions using invariants and state equation in 75 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 43/46 places, 200/212 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 183 ms. Remains : 43/46 places, 200/212 transitions.
Stuttering acceptance computed with spot in 218 ms :[(OR (NOT p3) (NOT p0) (NOT p1)), true, (NOT p0), (OR (AND (NOT p1) p3) (AND (NOT p1) p2)), (NOT p3)]
Running random walk in product with property : Szymanski-PT-a02-LTLCardinality-13 automaton TGBA Formula[mat=[[{ cond=(OR p3 p2), acceptance={} source=0 dest: 0}, { cond=(AND (NOT p3) (NOT p2)), acceptance={} source=0 dest: 1}, { cond=(OR (AND (NOT p0) p3) (AND (NOT p0) p2)), acceptance={} source=0 dest: 2}, { cond=(OR p3 p2), acceptance={} source=0 dest: 3}, { cond=(AND (NOT p3) p2), acceptance={} source=0 dest: 4}], [{ cond=true, acceptance={0} source=1 dest: 1}], [{ cond=(NOT p0), acceptance={0} source=2 dest: 2}], [{ cond=(OR (AND p3 (NOT p1)) (AND p2 (NOT p1))), acceptance={} source=3 dest: 1}], [{ cond=(AND (NOT p3) (NOT p2)), acceptance={0} source=4 dest: 1}, { cond=(AND (NOT p3) p2), acceptance={0} source=4 dest: 4}]], initial=0, aps=[p3:(LEQ s34 s32), p2:(LEQ 1 s22), p0:(GT 2 s10), p1:(LEQ s37 s40)], 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]]
Product exploration explored 100000 steps with 33424 reset in 164 ms.
Product exploration explored 100000 steps with 33650 reset in 218 ms.
Computed a total of 8 stabilizing places and 32 stable transitions
Computed a total of 8 stabilizing places and 32 stable transitions
Detected a total of 8/43 stabilizing places and 32/200 transitions leading to convergence knowledge of the form 'F(Gp|G!p)' for 1/4 atomic propositions.
Knowledge obtained : [(AND p3 (NOT p2) p0 p1), (X (NOT (AND (NOT p3) p2))), (X (NOT (OR (AND p3 (NOT p1)) (AND p2 (NOT p1))))), (X (NOT (OR (AND (NOT p0) p3) (AND (NOT p0) p2)))), (X p0), (X (OR p3 p2)), (X (NOT (AND (NOT p3) (NOT p2)))), true, (X (X (NOT (AND (NOT p3) p2)))), (X (X (NOT (OR (AND p3 (NOT p1)) (AND p2 (NOT p1)))))), (X (X (NOT (OR (AND (NOT p0) p3) (AND (NOT p0) p2))))), (X (X p0)), (X (X (OR p3 p2))), (X (X (NOT (AND (NOT p3) (NOT p2))))), (F (OR (G p0) (G (NOT p0))))]
False Knowledge obtained : []
Knowledge based reduction with 15 factoid took 864 ms. Reduced automaton from 5 states, 10 edges and 4 AP (stutter sensitive) to 5 states, 10 edges and 4 AP (stutter sensitive).
Stuttering acceptance computed with spot in 230 ms :[(OR (NOT p3) (NOT p0) (NOT p1)), true, (NOT p0), (OR (AND (NOT p1) p2) (AND (NOT p1) p3)), (NOT p3)]
Finished random walk after 934 steps, including 3 resets, run visited all 6 properties in 7 ms. (steps per millisecond=133 )
Knowledge obtained : [(AND p3 (NOT p2) p0 p1), (X (NOT (AND (NOT p3) p2))), (X (NOT (OR (AND p3 (NOT p1)) (AND p2 (NOT p1))))), (X (NOT (OR (AND (NOT p0) p3) (AND (NOT p0) p2)))), (X p0), (X (OR p3 p2)), (X (NOT (AND (NOT p3) (NOT p2)))), true, (X (X (NOT (AND (NOT p3) p2)))), (X (X (NOT (OR (AND p3 (NOT p1)) (AND p2 (NOT p1)))))), (X (X (NOT (OR (AND (NOT p0) p3) (AND (NOT p0) p2))))), (X (X p0)), (X (X (OR p3 p2))), (X (X (NOT (AND (NOT p3) (NOT p2))))), (F (OR (G p0) (G (NOT p0))))]
False Knowledge obtained : [(F (NOT p0)), (F (AND p2 (NOT p3))), (F (OR (AND p2 (NOT p1)) (AND p3 (NOT p1)))), (F (NOT (OR p2 p3))), (F (OR (AND p2 (NOT p0)) (AND (NOT p0) p3))), (F (AND (NOT p2) (NOT p3)))]
Property proved to be false thanks to negative knowledge :(F (NOT (OR p2 p3)))
Knowledge based reduction with 15 factoid took 441 ms. Reduced automaton from 5 states, 10 edges and 4 AP (stutter sensitive) to 1 states, 1 edges and 0 AP (stutter insensitive).
FORMULA Szymanski-PT-a02-LTLCardinality-13 FALSE TECHNIQUES KNOWLEDGE
Treatment of property Szymanski-PT-a02-LTLCardinality-13 finished in 2376 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(G((p0||G(p1)))))'
Support contains 3 out of 46 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 46/46 places, 212/212 transitions.
Discarding 3 places :
Symmetric choice reduction at 0 with 3 rule applications. Total rules 3 place count 43 transition count 200
Iterating global reduction 0 with 3 rules applied. Total rules applied 6 place count 43 transition count 200
Applied a total of 6 rules in 6 ms. Remains 43 /46 variables (removed 3) and now considering 200/212 (removed 12) transitions.
[2023-03-19 16:19:20] [INFO ] Flow matrix only has 75 transitions (discarded 125 similar events)
[2023-03-19 16:19:20] [INFO ] Invariant cache hit.
[2023-03-19 16:19:20] [INFO ] Implicit Places using invariants in 45 ms returned []
[2023-03-19 16:19:20] [INFO ] Flow matrix only has 75 transitions (discarded 125 similar events)
[2023-03-19 16:19:20] [INFO ] Invariant cache hit.
[2023-03-19 16:19:20] [INFO ] State equation strengthened by 9 read => feed constraints.
[2023-03-19 16:19:20] [INFO ] Implicit Places using invariants and state equation in 83 ms returned []
Implicit Place search using SMT with State Equation took 130 ms to find 0 implicit places.
[2023-03-19 16:19:20] [INFO ] Flow matrix only has 75 transitions (discarded 125 similar events)
[2023-03-19 16:19:20] [INFO ] Invariant cache hit.
[2023-03-19 16:19:20] [INFO ] Dead Transitions using invariants and state equation in 76 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 43/46 places, 200/212 transitions.
Finished structural reductions in LTL mode , in 1 iterations and 213 ms. Remains : 43/46 places, 200/212 transitions.
Stuttering acceptance computed with spot in 153 ms :[true, (AND (NOT p1) (NOT p0)), (NOT p1), (AND (NOT p1) (NOT p0))]
Running random walk in product with property : Szymanski-PT-a02-LTLCardinality-14 automaton TGBA Formula[mat=[[{ cond=true, acceptance={0} source=0 dest: 0}], [{ cond=true, acceptance={} source=1 dest: 3}], [{ cond=(NOT p1), acceptance={} source=2 dest: 0}, { cond=p1, acceptance={} source=2 dest: 2}], [{ cond=(AND (NOT p0) (NOT p1)), acceptance={} source=3 dest: 0}, { cond=(AND (NOT p0) p1), acceptance={} source=3 dest: 2}, { cond=p0, acceptance={} source=3 dest: 3}]], initial=1, aps=[p1:(LEQ 2 s42), p0:(LEQ s11 s36)], 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, null][false, false, false, false]]
Entered a terminal (fully accepting) state of product in 5 steps with 0 reset in 0 ms.
FORMULA Szymanski-PT-a02-LTLCardinality-14 FALSE TECHNIQUES STUTTER_TEST
Treatment of property Szymanski-PT-a02-LTLCardinality-14 finished in 384 ms.
All properties solved by simple procedures.
Total runtime 6969 ms.
ITS solved all properties within timeout

BK_STOP 1679242762000

--------------------
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

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-a02"
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-a02, 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-167912706700403"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/Szymanski-PT-a02.tgz
mv Szymanski-PT-a02 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 '' LTLCardinality.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
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 ;