Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2022-input.r240-smll-165303241300068.qcow2', fmt=qcow2 size=4294967296 backing_file=/data/fkordon/mcc2022-input.qcow2 cluster_size=65536 lazy_refcounts=off refcount_bits=16
Waiting for the VM to be ready (probing ssh)
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=====================================================================
Generated by BenchKit 2-4028
Executing tool itstools
Input is SmallOperatingSystem-PT-MT0064DC0016, examination is LTLFireability
Time confinement is 3600 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r240-smll-165303241300068
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 276K
-rw-r--r-- 1 mcc users 8.8K Apr 30 10:28 CTLCardinality.txt
-rw-r--r-- 1 mcc users 81K Apr 30 10:28 CTLCardinality.xml
-rw-r--r-- 1 mcc users 7.1K Apr 30 10:27 CTLFireability.txt
-rw-r--r-- 1 mcc users 60K Apr 30 10:27 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 10 09:34 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 6.7K May 10 09:34 GenericPropertiesVerdict.xml
-rw-r--r-- 1 mcc users 4.7K May 9 09:03 LTLCardinality.txt
-rw-r--r-- 1 mcc users 29K May 9 09:03 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.8K May 9 09:03 LTLFireability.txt
-rw-r--r-- 1 mcc users 16K May 9 09:03 LTLFireability.xml
-rw-r--r-- 1 mcc users 2.1K May 9 09:03 UpperBounds.txt
-rw-r--r-- 1 mcc users 4.1K May 9 09:03 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 10 09:34 equiv_col
-rw-r--r-- 1 mcc users 13 May 10 09:34 instance
-rw-r--r-- 1 mcc users 6 May 10 09:34 iscolored
-rw-r--r-- 1 mcc users 8.2K May 10 09:34 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 SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-00
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-01
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-02
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-03
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-04
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-05
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-06
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-07
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-08
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-09
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-10
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-11
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-12
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-13
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-14
FORMULA_NAME SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-15

=== Now, execution of the tool begins

BK_START 1653039908778

Running Version 202205111006
[2022-05-20 09:45:11] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, LTLFireability, -spotpath, /home/mcc/BenchKit/bin//..//ltlfilt, -z3path, /home/mcc/BenchKit/bin//..//z3/bin/z3, -yices2path, /home/mcc/BenchKit/bin//..//yices/bin/yices, -its, -ltsmin, -greatspnpath, /home/mcc/BenchKit/bin//..//greatspn/, -order, META, -manyOrder, -smt, -timeout, 3600]
[2022-05-20 09:45:11] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2022-05-20 09:45:11] [INFO ] Load time of PNML (sax parser for PT used): 87 ms
[2022-05-20 09:45:11] [INFO ] Transformed 9 places.
[2022-05-20 09:45:11] [INFO ] Transformed 8 transitions.
[2022-05-20 09:45:11] [INFO ] Parsed PT model containing 9 places and 8 transitions in 323 ms.
Parsed 16 properties from file /home/mcc/execution/LTLFireability.xml in 25 ms.
Working with output stream class java.io.PrintStream
Initial state reduction rules removed 6 formulas.
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-00 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-06 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-08 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-12 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-14 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-15 FALSE TECHNIQUES TOPOLOGICAL INITIAL_STATE
Support contains 9 out of 9 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 9/9 places, 8/8 transitions.
Applied a total of 0 rules in 16 ms. Remains 9 /9 variables (removed 0) and now considering 8/8 (removed 0) transitions.
// Phase 1: matrix 8 rows 9 cols
[2022-05-20 09:45:11] [INFO ] Computed 4 place invariants in 10 ms
[2022-05-20 09:45:12] [INFO ] Implicit Places using invariants in 292 ms returned []
// Phase 1: matrix 8 rows 9 cols
[2022-05-20 09:45:12] [INFO ] Computed 4 place invariants in 3 ms
[2022-05-20 09:45:12] [INFO ] Implicit Places using invariants and state equation in 61 ms returned []
Implicit Place search using SMT with State Equation took 418 ms to find 0 implicit places.
// Phase 1: matrix 8 rows 9 cols
[2022-05-20 09:45:12] [INFO ] Computed 4 place invariants in 2 ms
[2022-05-20 09:45:12] [INFO ] Dead Transitions using invariants and state equation in 55 ms found 0 transitions.
Finished structural reductions, in 1 iterations. Remains : 9/9 places, 8/8 transitions.
Support contains 9 out of 9 places after structural reductions.
[2022-05-20 09:45:12] [INFO ] Flatten gal took : 27 ms
[2022-05-20 09:45:12] [INFO ] Flatten gal took : 7 ms
[2022-05-20 09:45:12] [INFO ] Input system was already deterministic with 8 transitions.
Finished random walk after 222 steps, including 0 resets, run visited all 15 properties in 39 ms. (steps per millisecond=5 )
Computed a total of 0 stabilizing places and 0 stable transitions
Running Spot : cd /home/mcc/execution;'/home/mcc/BenchKit/bin//..//ltl2tgba' '--check=stutter' '--hoaf=tv' '-f' '!(G(X(p0)))'
Support contains 5 out of 9 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 9/9 places, 8/8 transitions.
Discarding 1 places :
Symmetric choice reduction at 0 with 1 rule applications. Total rules 1 place count 8 transition count 7
Iterating global reduction 0 with 1 rules applied. Total rules applied 2 place count 8 transition count 7
Applied a total of 2 rules in 6 ms. Remains 8 /9 variables (removed 1) and now considering 7/8 (removed 1) transitions.
// Phase 1: matrix 7 rows 8 cols
[2022-05-20 09:45:13] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:13] [INFO ] Implicit Places using invariants in 38 ms returned []
// Phase 1: matrix 7 rows 8 cols
[2022-05-20 09:45:13] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:13] [INFO ] Implicit Places using invariants and state equation in 35 ms returned []
Implicit Place search using SMT with State Equation took 76 ms to find 0 implicit places.
// Phase 1: matrix 7 rows 8 cols
[2022-05-20 09:45:13] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:13] [INFO ] Dead Transitions using invariants and state equation in 38 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 8/9 places, 7/8 transitions.
Finished structural reductions, in 1 iterations. Remains : 8/9 places, 7/8 transitions.
Stuttering acceptance computed with spot in 360 ms :[true, (NOT p0), (NOT p0)]
Running random walk in product with property : SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-01 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:(OR (LT s0 1) (LT s1 1) (LT s2 1) (AND (GEQ s4 1) (GEQ s6 1)))], 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 SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-01 FALSE TECHNIQUES STUTTER_TEST
Treatment of property SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-01 finished in 602 ms.
Running Spot : cd /home/mcc/execution;'/home/mcc/BenchKit/bin//..//ltl2tgba' '--check=stutter' '--hoaf=tv' '-f' '!((G((F(p0)||G(p0)))||F(X(p0))))'
Support contains 1 out of 9 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 9/9 places, 8/8 transitions.
Ensure Unique test removed 1 places
Iterating post reduction 0 with 1 rules applied. Total rules applied 1 place count 8 transition count 8
Applied a total of 1 rules in 1 ms. Remains 8 /9 variables (removed 1) and now considering 8/8 (removed 0) transitions.
// Phase 1: matrix 8 rows 8 cols
[2022-05-20 09:45:13] [INFO ] Computed 3 place invariants in 0 ms
[2022-05-20 09:45:13] [INFO ] Implicit Places using invariants in 41 ms returned []
// Phase 1: matrix 8 rows 8 cols
[2022-05-20 09:45:13] [INFO ] Computed 3 place invariants in 1 ms
[2022-05-20 09:45:13] [INFO ] Implicit Places using invariants and state equation in 62 ms returned []
Implicit Place search using SMT with State Equation took 110 ms to find 0 implicit places.
// Phase 1: matrix 8 rows 8 cols
[2022-05-20 09:45:13] [INFO ] Computed 3 place invariants in 2 ms
[2022-05-20 09:45:13] [INFO ] Dead Transitions using invariants and state equation in 60 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 8/9 places, 8/8 transitions.
Finished structural reductions, in 1 iterations. Remains : 8/9 places, 8/8 transitions.
Stuttering acceptance computed with spot in 91 ms :[(NOT p0), (NOT p0)]
Running random walk in product with property : SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-02 automaton TGBA Formula[mat=[[{ cond=true, acceptance={} source=0 dest: 1}], [{ cond=(NOT p0), acceptance={0} source=1 dest: 1}]], initial=0, aps=[p0:(LT s7 1)], 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 1010 reset in 351 ms.
Stack based approach found an accepted trace after 10 steps with 0 reset with depth 11 and stack size 11 in 0 ms.
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-02 FALSE TECHNIQUES STACK_TEST
Treatment of property SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-02 finished in 639 ms.
Running Spot : cd /home/mcc/execution;'/home/mcc/BenchKit/bin//..//ltl2tgba' '--check=stutter' '--hoaf=tv' '-f' '!(X(X(F((G(p0)&&(X(!p0)||p1))))))'
Support contains 3 out of 9 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 9/9 places, 8/8 transitions.
Discarding 1 places :
Symmetric choice reduction at 0 with 1 rule applications. Total rules 1 place count 8 transition count 7
Iterating global reduction 0 with 1 rules applied. Total rules applied 2 place count 8 transition count 7
Applied a total of 2 rules in 2 ms. Remains 8 /9 variables (removed 1) and now considering 7/8 (removed 1) transitions.
// Phase 1: matrix 7 rows 8 cols
[2022-05-20 09:45:14] [INFO ] Computed 4 place invariants in 3 ms
[2022-05-20 09:45:14] [INFO ] Implicit Places using invariants in 34 ms returned []
// Phase 1: matrix 7 rows 8 cols
[2022-05-20 09:45:14] [INFO ] Computed 4 place invariants in 4 ms
[2022-05-20 09:45:14] [INFO ] Implicit Places using invariants and state equation in 37 ms returned []
Implicit Place search using SMT with State Equation took 74 ms to find 0 implicit places.
// Phase 1: matrix 7 rows 8 cols
[2022-05-20 09:45:14] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:14] [INFO ] Dead Transitions using invariants and state equation in 34 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 8/9 places, 7/8 transitions.
Finished structural reductions, in 1 iterations. Remains : 8/9 places, 7/8 transitions.
Stuttering acceptance computed with spot in 306 ms :[(OR (NOT p1) (NOT p0)), (OR (NOT p0) (NOT p1)), (OR (NOT p0) (NOT p1)), (NOT p0), (AND p0 (NOT p1))]
Running random walk in product with property : SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-03 automaton TGBA Formula[mat=[[{ cond=true, acceptance={} source=0 dest: 1}], [{ cond=true, acceptance={} source=1 dest: 2}], [{ cond=(NOT p0), acceptance={0} source=2 dest: 2}, { cond=p0, acceptance={} source=2 dest: 3}, { cond=(AND p0 (NOT p1)), acceptance={0} source=2 dest: 4}], [{ cond=(NOT p0), acceptance={0} source=3 dest: 2}, { cond=p0, acceptance={} source=3 dest: 3}], [{ cond=p0, acceptance={} source=4 dest: 3}, { cond=(AND p0 (NOT p1)), acceptance={0} source=4 dest: 4}]], initial=0, aps=[p0:(AND (GEQ s0 1) (GEQ s1 1) (GEQ s2 1)), p1:(OR (LT s0 1) (LT s1 1) (LT s2 1))], nbAcceptance=1, properties=[trans-labels, explicit-labels, trans-acc, no-univ-branch, stutter-sensitive], stateDesc=[null, null, null, null, null][false, false, false, false, false]]
Product exploration explored 100000 steps with 435 reset in 200 ms.
Stack based approach found an accepted trace after 139 steps with 0 reset with depth 140 and stack size 108 in 1 ms.
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-03 FALSE TECHNIQUES STACK_TEST
Treatment of property SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-03 finished in 652 ms.
Running Spot : cd /home/mcc/execution;'/home/mcc/BenchKit/bin//..//ltl2tgba' '--check=stutter' '--hoaf=tv' '-f' '!(X(G((G(F(p0))&&G(p1)))))'
Support contains 5 out of 9 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 9/9 places, 8/8 transitions.
Discarding 1 places :
Symmetric choice reduction at 0 with 1 rule applications. Total rules 1 place count 8 transition count 7
Iterating global reduction 0 with 1 rules applied. Total rules applied 2 place count 8 transition count 7
Applied a total of 2 rules in 1 ms. Remains 8 /9 variables (removed 1) and now considering 7/8 (removed 1) transitions.
// Phase 1: matrix 7 rows 8 cols
[2022-05-20 09:45:15] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:15] [INFO ] Implicit Places using invariants in 25 ms returned []
// Phase 1: matrix 7 rows 8 cols
[2022-05-20 09:45:15] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:15] [INFO ] Implicit Places using invariants and state equation in 31 ms returned []
Implicit Place search using SMT with State Equation took 60 ms to find 0 implicit places.
// Phase 1: matrix 7 rows 8 cols
[2022-05-20 09:45:15] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:15] [INFO ] Dead Transitions using invariants and state equation in 28 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 8/9 places, 7/8 transitions.
Finished structural reductions, in 1 iterations. Remains : 8/9 places, 7/8 transitions.
Stuttering acceptance computed with spot in 128 ms :[(OR (NOT p1) (NOT p0)), (OR (NOT p1) (NOT p0)), true, (NOT p0)]
Running random walk in product with property : SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-04 automaton TGBA Formula[mat=[[{ cond=true, acceptance={} source=0 dest: 1}], [{ cond=p1, acceptance={} source=1 dest: 1}, { cond=(NOT p1), acceptance={} source=1 dest: 2}, { cond=(AND p1 (NOT p0)), acceptance={} source=1 dest: 3}], [{ cond=true, acceptance={0} source=2 dest: 2}], [{ cond=(NOT p0), acceptance={0} source=3 dest: 3}]], initial=0, aps=[p1:(AND (GEQ s4 1) (GEQ s6 1)), p0:(AND (GEQ s0 1) (GEQ s2 1) (GEQ s5 1))], nbAcceptance=1, properties=[trans-labels, explicit-labels, trans-acc, no-univ-branch, stutter-sensitive, very-weak, weak, inherently-weak], stateDesc=[null, null, null, null][false, false, false, false]]
Entered a terminal (fully accepting) state of product in 1 steps with 0 reset in 0 ms.
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-04 FALSE TECHNIQUES STUTTER_TEST
Treatment of property SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-04 finished in 238 ms.
Running Spot : cd /home/mcc/execution;'/home/mcc/BenchKit/bin//..//ltl2tgba' '--check=stutter' '--hoaf=tv' '-f' '!(X(X(X(X((p0 U (!F(p0)||X(p1))))))))'
Support contains 4 out of 9 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 9/9 places, 8/8 transitions.
Applied a total of 0 rules in 1 ms. Remains 9 /9 variables (removed 0) and now considering 8/8 (removed 0) transitions.
// Phase 1: matrix 8 rows 9 cols
[2022-05-20 09:45:15] [INFO ] Computed 4 place invariants in 2 ms
[2022-05-20 09:45:15] [INFO ] Implicit Places using invariants in 23 ms returned []
// Phase 1: matrix 8 rows 9 cols
[2022-05-20 09:45:15] [INFO ] Computed 4 place invariants in 3 ms
[2022-05-20 09:45:15] [INFO ] Implicit Places using invariants and state equation in 36 ms returned []
Implicit Place search using SMT with State Equation took 61 ms to find 0 implicit places.
// Phase 1: matrix 8 rows 9 cols
[2022-05-20 09:45:15] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:15] [INFO ] Dead Transitions using invariants and state equation in 26 ms found 0 transitions.
Finished structural reductions, in 1 iterations. Remains : 9/9 places, 8/8 transitions.
Stuttering acceptance computed with spot in 303 ms :[(AND p0 (NOT p1)), (AND p0 (NOT p1)), (AND p0 (NOT p1)), p0, (AND p0 (NOT p1)), (AND p0 (NOT p1)), (AND p0 (NOT p1)), (AND p0 (NOT p1)), true]
Running random walk in product with property : SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-05 automaton TGBA Formula[mat=[[{ cond=p0, acceptance={} source=0 dest: 1}, { cond=(NOT p0), acceptance={} source=0 dest: 2}], [{ cond=(AND p0 (NOT p1)), acceptance={0} source=1 dest: 1}, { cond=(AND (NOT p0) (NOT p1)), acceptance={0} source=1 dest: 2}], [{ cond=(AND (NOT p0) (NOT p1)), acceptance={} source=2 dest: 3}, { cond=(AND p0 (NOT p1)), acceptance={} source=2 dest: 8}], [{ cond=(NOT p0), acceptance={} source=3 dest: 3}, { cond=p0, acceptance={} source=3 dest: 8}], [{ cond=true, acceptance={} source=4 dest: 0}], [{ cond=true, acceptance={} source=5 dest: 4}], [{ cond=true, acceptance={} source=6 dest: 5}], [{ cond=true, acceptance={} source=7 dest: 6}], [{ cond=true, acceptance={0} source=8 dest: 8}]], initial=7, aps=[p0:(GEQ s3 1), p1:(AND (GEQ s0 1) (GEQ s2 1) (GEQ s5 1))], 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, null, null, null, null][false, false, false, false, false, false, false, false, false]]
Entered a terminal (fully accepting) state of product in 11 steps with 0 reset in 0 ms.
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-05 FALSE TECHNIQUES STUTTER_TEST
Treatment of property SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-05 finished in 407 ms.
Running Spot : cd /home/mcc/execution;'/home/mcc/BenchKit/bin//..//ltl2tgba' '--check=stutter' '--hoaf=tv' '-f' '!(G(X(F(X(F((!(!p0 U p0)&&p1)))))))'
Support contains 3 out of 9 places. Attempting structural reductions.
Starting structural reductions in SI_LTL mode, iteration 0 : 9/9 places, 8/8 transitions.
Ensure Unique test removed 1 places
Drop transitions removed 1 transitions
Trivial Post-agglo rules discarded 1 transitions
Performed 1 trivial Post agglomeration. Transition count delta: 1
Iterating post reduction 0 with 1 rules applied. Total rules applied 1 place count 8 transition count 7
Reduce places removed 1 places and 0 transitions.
Performed 1 Post agglomeration using F-continuation condition.Transition count delta: 1
Iterating post reduction 1 with 2 rules applied. Total rules applied 3 place count 7 transition count 6
Reduce places removed 2 places and 0 transitions.
Graph (trivial) has 2 edges and 5 vertex of which 2 / 5 are part of one of the 1 SCC in 2 ms
Free SCC test removed 1 places
Iterating post reduction 2 with 3 rules applied. Total rules applied 6 place count 4 transition count 6
Ensure Unique test removed 1 transitions
Reduce isomorphic transitions removed 1 transitions.
Iterating post reduction 3 with 1 rules applied. Total rules applied 7 place count 4 transition count 5
Applied a total of 7 rules in 13 ms. Remains 4 /9 variables (removed 5) and now considering 5/8 (removed 3) transitions.
// Phase 1: matrix 5 rows 4 cols
[2022-05-20 09:45:15] [INFO ] Computed 2 place invariants in 0 ms
[2022-05-20 09:45:15] [INFO ] Implicit Places using invariants in 18 ms returned []
// Phase 1: matrix 5 rows 4 cols
[2022-05-20 09:45:15] [INFO ] Computed 2 place invariants in 1 ms
[2022-05-20 09:45:15] [INFO ] Implicit Places using invariants and state equation in 35 ms returned []
Implicit Place search using SMT with State Equation took 53 ms to find 0 implicit places.
[2022-05-20 09:45:15] [INFO ] Redundant transitions in 0 ms returned []
// Phase 1: matrix 5 rows 4 cols
[2022-05-20 09:45:15] [INFO ] Computed 2 place invariants in 0 ms
[2022-05-20 09:45:15] [INFO ] Dead Transitions using invariants and state equation in 33 ms found 0 transitions.
Starting structural reductions in SI_LTL mode, iteration 1 : 4/9 places, 5/8 transitions.
Finished structural reductions, in 1 iterations. Remains : 4/9 places, 5/8 transitions.
Stuttering acceptance computed with spot in 132 ms :[(OR (NOT p1) p0), (OR (NOT p1) p0), p0]
Running random walk in product with property : SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-07 automaton TGBA Formula[mat=[[{ cond=true, acceptance={} source=0 dest: 0}, { cond=(OR (NOT p1) p0), acceptance={} source=0 dest: 1}], [{ cond=(OR (NOT p1) p0), acceptance={0} source=1 dest: 1}, { cond=(AND p1 (NOT p0)), acceptance={} source=1 dest: 2}], [{ cond=p0, acceptance={0} source=2 dest: 1}, { cond=(NOT p0), acceptance={} source=2 dest: 2}]], initial=0, aps=[p1:(LT s3 1), p0:(AND (GEQ s1 1) (GEQ s2 1))], nbAcceptance=1, properties=[trans-labels, explicit-labels, trans-acc, complete, no-univ-branch, stutter-invariant], stateDesc=[null, null, null][true, true, true]]
Stuttering criterion allowed to conclude after 1 steps with 0 reset in 0 ms.
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-07 FALSE TECHNIQUES STUTTER_TEST
Treatment of property SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-07 finished in 253 ms.
Running Spot : cd /home/mcc/execution;'/home/mcc/BenchKit/bin//..//ltl2tgba' '--check=stutter' '--hoaf=tv' '-f' '!(X(X(G(X(X((G(F((G(p2)&&p1)))||p0)))))))'
Support contains 3 out of 9 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 9/9 places, 8/8 transitions.
Ensure Unique test removed 1 places
Iterating post reduction 0 with 1 rules applied. Total rules applied 1 place count 8 transition count 8
Discarding 1 places :
Symmetric choice reduction at 1 with 1 rule applications. Total rules 2 place count 7 transition count 7
Iterating global reduction 1 with 1 rules applied. Total rules applied 3 place count 7 transition count 7
Applied a total of 3 rules in 1 ms. Remains 7 /9 variables (removed 2) and now considering 7/8 (removed 1) transitions.
// Phase 1: matrix 7 rows 7 cols
[2022-05-20 09:45:15] [INFO ] Computed 3 place invariants in 1 ms
[2022-05-20 09:45:15] [INFO ] Implicit Places using invariants in 23 ms returned []
// Phase 1: matrix 7 rows 7 cols
[2022-05-20 09:45:15] [INFO ] Computed 3 place invariants in 1 ms
[2022-05-20 09:45:15] [INFO ] Implicit Places using invariants and state equation in 26 ms returned []
Implicit Place search using SMT with State Equation took 51 ms to find 0 implicit places.
// Phase 1: matrix 7 rows 7 cols
[2022-05-20 09:45:15] [INFO ] Computed 3 place invariants in 0 ms
[2022-05-20 09:45:16] [INFO ] Dead Transitions using invariants and state equation in 26 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 7/9 places, 7/8 transitions.
Finished structural reductions, in 1 iterations. Remains : 7/9 places, 7/8 transitions.
Stuttering acceptance computed with spot in 364 ms :[(OR (AND (NOT p0) (NOT p1)) (AND (NOT p0) (NOT p2))), (OR (AND (NOT p0) (NOT p1)) (AND (NOT p0) (NOT p2))), (OR (AND (NOT p0) (NOT p1)) (AND (NOT p0) (NOT p2))), (OR (AND (NOT p0) (NOT p1)) (AND (NOT p0) (NOT p2))), (OR (AND (NOT p0) (NOT p1)) (AND (NOT p0) (NOT p2))), (OR (NOT p2) (NOT p1)), (OR (NOT p1) (NOT p2)), (NOT p2)]
Running random walk in product with property : SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-09 automaton TGBA Formula[mat=[[{ cond=true, acceptance={} source=0 dest: 1}], [{ cond=true, acceptance={} source=1 dest: 2}], [{ cond=true, acceptance={} source=2 dest: 3}], [{ cond=true, acceptance={} source=3 dest: 4}], [{ cond=p0, acceptance={} source=4 dest: 4}, { cond=(OR (AND (NOT p0) (NOT p1)) (AND (NOT p0) (NOT p2))), acceptance={} source=4 dest: 5}, { cond=(NOT p0), acceptance={} source=4 dest: 6}], [{ cond=(OR (NOT p1) (NOT p2)), acceptance={0} source=5 dest: 5}, { cond=(AND p1 p2), acceptance={} source=5 dest: 7}], [{ cond=(OR (NOT p1) (NOT p2)), acceptance={} source=6 dest: 5}, { cond=true, acceptance={} source=6 dest: 6}], [{ cond=(NOT p2), acceptance={0} source=7 dest: 5}, { cond=p2, acceptance={} source=7 dest: 7}]], initial=0, aps=[p0:(OR (LT s4 1) (LT s5 1)), p1:(AND (GEQ s4 1) (GEQ s5 1)), p2:(OR (LT s3 1) (LT s5 1))], nbAcceptance=1, properties=[trans-labels, explicit-labels, trans-acc, complete, no-univ-branch, stutter-sensitive], stateDesc=[null, null, null, null, null, null, null, null][false, false, false, false, false, false, false, false]]
Product exploration explored 100000 steps with 0 reset in 205 ms.
Stack based approach found an accepted trace after 15 steps with 0 reset with depth 16 and stack size 16 in 0 ms.
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-09 FALSE TECHNIQUES STACK_TEST
Treatment of property SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-09 finished in 669 ms.
Running Spot : cd /home/mcc/execution;'/home/mcc/BenchKit/bin//..//ltl2tgba' '--check=stutter' '--hoaf=tv' '-f' '!(F(!(p0 U p1)))'
Support contains 7 out of 9 places. Attempting structural reductions.
Starting structural reductions in SI_LTL mode, iteration 0 : 9/9 places, 8/8 transitions.
Applied a total of 0 rules in 13 ms. Remains 9 /9 variables (removed 0) and now considering 8/8 (removed 0) transitions.
// Phase 1: matrix 8 rows 9 cols
[2022-05-20 09:45:16] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:16] [INFO ] Implicit Places using invariants in 39 ms returned []
// Phase 1: matrix 8 rows 9 cols
[2022-05-20 09:45:16] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:16] [INFO ] Implicit Places using invariants and state equation in 43 ms returned []
Implicit Place search using SMT with State Equation took 83 ms to find 0 implicit places.
[2022-05-20 09:45:16] [INFO ] Redundant transitions in 0 ms returned []
// Phase 1: matrix 8 rows 9 cols
[2022-05-20 09:45:16] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:16] [INFO ] Dead Transitions using invariants and state equation in 47 ms found 0 transitions.
Finished structural reductions, in 1 iterations. Remains : 9/9 places, 8/8 transitions.
Stuttering acceptance computed with spot in 41 ms :[p1]
Running random walk in product with property : SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-10 automaton TGBA Formula[mat=[[{ cond=(AND p0 (NOT p1)), acceptance={} source=0 dest: 0}, { cond=p1, acceptance={0} source=0 dest: 0}]], initial=0, aps=[p0:(OR (AND (GEQ s4 1) (GEQ s6 1)) (AND (GEQ s0 1) (GEQ s1 1) (GEQ s2 1)) (GEQ s3 1)), p1:(AND (GEQ s0 1) (GEQ s2 1) (GEQ s5 1) (GEQ s3 1))], nbAcceptance=1, properties=[trans-labels, explicit-labels, trans-acc, deterministic, no-univ-branch, unambiguous, semi-deterministic, stutter-invariant], stateDesc=[null][true]]
Product exploration explored 100000 steps with 81 reset in 224 ms.
Stack based approach found an accepted trace after 13 steps with 0 reset with depth 14 and stack size 14 in 1 ms.
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-10 FALSE TECHNIQUES STACK_TEST
Treatment of property SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-10 finished in 443 ms.
Running Spot : cd /home/mcc/execution;'/home/mcc/BenchKit/bin//..//ltl2tgba' '--check=stutter' '--hoaf=tv' '-f' '!(G(X(X((G(!(p0 U p1))||G(p2)||p0)))))'
Support contains 5 out of 9 places. Attempting structural reductions.
Starting structural reductions in LTL mode, iteration 0 : 9/9 places, 8/8 transitions.
Discarding 1 places :
Symmetric choice reduction at 0 with 1 rule applications. Total rules 1 place count 8 transition count 7
Iterating global reduction 0 with 1 rules applied. Total rules applied 2 place count 8 transition count 7
Applied a total of 2 rules in 2 ms. Remains 8 /9 variables (removed 1) and now considering 7/8 (removed 1) transitions.
// Phase 1: matrix 7 rows 8 cols
[2022-05-20 09:45:17] [INFO ] Computed 4 place invariants in 0 ms
[2022-05-20 09:45:17] [INFO ] Implicit Places using invariants in 28 ms returned []
// Phase 1: matrix 7 rows 8 cols
[2022-05-20 09:45:17] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:17] [INFO ] Implicit Places using invariants and state equation in 40 ms returned []
Implicit Place search using SMT with State Equation took 71 ms to find 0 implicit places.
// Phase 1: matrix 7 rows 8 cols
[2022-05-20 09:45:17] [INFO ] Computed 4 place invariants in 1 ms
[2022-05-20 09:45:17] [INFO ] Dead Transitions using invariants and state equation in 32 ms found 0 transitions.
Starting structural reductions in LTL mode, iteration 1 : 8/9 places, 7/8 transitions.
Finished structural reductions, in 1 iterations. Remains : 8/9 places, 7/8 transitions.
Stuttering acceptance computed with spot in 318 ms :[true, (AND p1 (NOT p2)), (AND p1 (NOT p2) (NOT p0)), (AND p1 (NOT p2) (NOT p0)), (AND p1 (NOT p2) (NOT p0)), p1, (NOT p2)]
Running random walk in product with property : SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-11 automaton TGBA Formula[mat=[[{ cond=true, acceptance={0} source=0 dest: 0}], [{ cond=(AND (NOT p2) p1), acceptance={} source=1 dest: 0}, { cond=(AND p2 (NOT p1)), acceptance={} source=1 dest: 1}, { cond=(AND (NOT p2) (NOT p1)), acceptance={} source=1 dest: 5}, { cond=(AND p2 p1), acceptance={} source=1 dest: 6}], [{ cond=(AND (NOT p0) (NOT p2) p1), acceptance={} source=2 dest: 0}, { cond=(AND (NOT p0) p2 (NOT p1)), acceptance={} source=2 dest: 1}, { cond=p0, acceptance={} source=2 dest: 2}, { cond=(AND (NOT p0) (NOT p2) (NOT p1)), acceptance={} source=2 dest: 5}, { cond=(AND (NOT p0) p2 p1), acceptance={} source=2 dest: 6}], [{ cond=true, acceptance={} source=3 dest: 4}], [{ cond=true, acceptance={} source=4 dest: 2}], [{ cond=p1, acceptance={} source=5 dest: 0}, { cond=(NOT p1), acceptance={} source=5 dest: 5}], [{ cond=(NOT p2), acceptance={} source=6 dest: 0}, { cond=p2, acceptance={} source=6 dest: 6}]], initial=3, aps=[p2:(GEQ s4 1), p1:(AND (GEQ s0 1) (GEQ s2 1) (GEQ s5 1)), p0:(AND (GEQ s0 1) (GEQ s1 1) (GEQ s2 1))], 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, null, null, null][false, false, false, false, false, false, false]]
Entered a terminal (fully accepting) state of product in 122 steps with 0 reset in 0 ms.
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-11 FALSE TECHNIQUES STUTTER_TEST
Treatment of property SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-11 finished in 456 ms.
Running Spot : cd /home/mcc/execution;'/home/mcc/BenchKit/bin//..//ltl2tgba' '--check=stutter' '--hoaf=tv' '-f' '!(F(p0))'
Support contains 2 out of 9 places. Attempting structural reductions.
Starting structural reductions in SI_LTL mode, iteration 0 : 9/9 places, 8/8 transitions.
Ensure Unique test removed 1 places
Performed 1 Post agglomeration using F-continuation condition.Transition count delta: 1
Deduced a syphon composed of 1 places in 0 ms
Reduce places removed 2 places and 0 transitions.
Iterating global reduction 0 with 3 rules applied. Total rules applied 3 place count 6 transition count 7
Performed 1 Post agglomeration using F-continuation condition.Transition count delta: 0
Deduced a syphon composed of 1 places in 0 ms
Reduce places removed 1 places and 0 transitions.
Iterating global reduction 0 with 2 rules applied. Total rules applied 5 place count 5 transition count 7
Applied a total of 5 rules in 4 ms. Remains 5 /9 variables (removed 4) and now considering 7/8 (removed 1) transitions.
// Phase 1: matrix 7 rows 5 cols
[2022-05-20 09:45:17] [INFO ] Computed 2 place invariants in 0 ms
[2022-05-20 09:45:17] [INFO ] Implicit Places using invariants in 21 ms returned []
// Phase 1: matrix 7 rows 5 cols
[2022-05-20 09:45:17] [INFO ] Computed 2 place invariants in 0 ms
[2022-05-20 09:45:17] [INFO ] State equation strengthened by 1 read => feed constraints.
[2022-05-20 09:45:17] [INFO ] Implicit Places using invariants and state equation in 24 ms returned []
Implicit Place search using SMT with State Equation took 46 ms to find 0 implicit places.
[2022-05-20 09:45:17] [INFO ] Redundant transitions in 0 ms returned []
// Phase 1: matrix 7 rows 5 cols
[2022-05-20 09:45:17] [INFO ] Computed 2 place invariants in 1 ms
[2022-05-20 09:45:17] [INFO ] Dead Transitions using invariants and state equation in 29 ms found 0 transitions.
Starting structural reductions in SI_LTL mode, iteration 1 : 5/9 places, 7/8 transitions.
Finished structural reductions, in 1 iterations. Remains : 5/9 places, 7/8 transitions.
Stuttering acceptance computed with spot in 33 ms :[(NOT p0)]
Running random walk in product with property : SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-13 automaton TGBA Formula[mat=[[{ cond=(NOT p0), acceptance={0} source=0 dest: 0}]], initial=0, aps=[p0:(OR (GEQ s4 1) (GEQ s2 1))], 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]]
Product exploration explored 100000 steps with 50000 reset in 62 ms.
Product exploration explored 100000 steps with 50000 reset in 84 ms.
Computed a total of 0 stabilizing places and 0 stable transitions
Computed a total of 0 stabilizing places and 0 stable transitions
Knowledge obtained : [(NOT p0), (X p0)]
False Knowledge obtained : [(X (X (NOT p0))), (X (X p0))]
Property proved to be true thanks to knowledge :(X p0)
Knowledge based reduction with 2 factoid took 127 ms. Reduced automaton from 1 states, 1 edges and 1 AP to 1 states, 0 edges and 0 AP.
FORMULA SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-13 TRUE TECHNIQUES KNOWLEDGE
Treatment of property SmallOperatingSystem-PT-MT0064DC0016-LTLFireability-13 finished in 410 ms.
All properties solved by simple procedures.
Total runtime 6669 ms.

BK_STOP 1653039917996

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

+ export LANG=C
+ LANG=C
+ export BINDIR=/home/mcc/BenchKit/bin//../
+ BINDIR=/home/mcc/BenchKit/bin//../
++ pwd
+ export MODEL=/home/mcc/execution
+ MODEL=/home/mcc/execution
+ [[ LTLFireability = StateSpace ]]
+ /home/mcc/BenchKit/bin//..//runeclipse.sh /home/mcc/execution LTLFireability -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600
+ ulimit -s 65536
+ export PYTHONPATH=/usr/lib/python3.9/site-packages/
+ PYTHONPATH=/usr/lib/python3.9/site-packages/
+ export LD_LIBRARY_PATH=/usr/local/lib:
+ LD_LIBRARY_PATH=/usr/local/lib:
+ [[ -z '' ]]
+ export LTSMIN_MEM_SIZE=8589934592
+ LTSMIN_MEM_SIZE=8589934592
++ sed s/.jar//
++ perl -pe 's/.*\.//g'
++ ls /home/mcc/BenchKit/bin//..//itstools/plugins/fr.lip6.move.gal.application.pnmcc_1.0.0.202205111006.jar
+ VERSION=202205111006
+ echo 'Running Version 202205111006'
+ /home/mcc/BenchKit/bin//..//itstools/its-tools -data @none -pnfolder /home/mcc/execution -examination LTLFireability -spotpath /home/mcc/BenchKit/bin//..//ltlfilt -z3path /home/mcc/BenchKit/bin//..//z3/bin/z3 -yices2path /home/mcc/BenchKit/bin//..//yices/bin/yices -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//..//greatspn/ -order META -manyOrder -smt -timeout 3600 -vmargs -Dosgi.locking=none -Declipse.stateSaveDelayInterval=-1 -Dosgi.configuration.area=@none -Xss128m -Xms40m -Xmx8192m

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="SmallOperatingSystem-PT-MT0064DC0016"
export BK_EXAMINATION="LTLFireability"
export BK_TOOL="itstools"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="3600"
export BK_MEMORY_CONFINEMENT="16384"
export BK_BIN_PATH="/home/mcc/BenchKit/bin/"

# this is specific to your benchmark or test

export BIN_DIR="$HOME/BenchKit/bin"

# remove the execution directoty if it exists (to avoid increse of .vmdk images)
if [ -d execution ] ; then
rm -rf execution
fi

# this is for BenchKit: explicit launching of the test
echo "====================================================================="
echo " Generated by BenchKit 2-4028"
echo " Executing tool itstools"
echo " Input is SmallOperatingSystem-PT-MT0064DC0016, examination is LTLFireability"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r240-smll-165303241300068"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/SmallOperatingSystem-PT-MT0064DC0016.tgz
mv SmallOperatingSystem-PT-MT0064DC0016 execution
cd execution
if [ "LTLFireability" = "ReachabilityDeadlock" ] || [ "LTLFireability" = "UpperBounds" ] || [ "LTLFireability" = "QuasiLiveness" ] || [ "LTLFireability" = "StableMarking" ] || [ "LTLFireability" = "Liveness" ] || [ "LTLFireability" = "OneSafe" ] || [ "LTLFireability" = "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 [ "LTLFireability" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "LTLFireability" != "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 "LTLFireability.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property LTLFireability.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "LTLFireability.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 '' LTLFireability.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "LTLFireability" = "ReachabilityDeadlock" ] || [ "LTLFireability" = "QuasiLiveness" ] || [ "LTLFireability" = "StableMarking" ] || [ "LTLFireability" = "Liveness" ] || [ "LTLFireability" = "OneSafe" ] ; then
echo "FORMULA_NAME LTLFireability"
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 ;