fond
Model Checking Contest 2022
12th edition, Bergen, Norway, June 21, 2022
Execution of r067-tall-165254777900067
Last Updated
Jun 22, 2022

About the Execution of ITS-Tools for DLCflexbar-PT-8b

Execution Summary
Max Memory
Used (MB)
Time wait (ms) CPU Usage (ms) I/O Wait (ms) Computed Result Execution
Status
1902.140 618564.00 697769.00 1351.60 T normal

Execution Chart

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

Trace from the execution

Formatting '/data/fkordon/mcc2022-input.r067-tall-165254777900067.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)
.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................
=====================================================================
Generated by BenchKit 2-4028
Executing tool itstools
Input is DLCflexbar-PT-8b, examination is QuasiLiveness
Time confinement is 1800 seconds
Memory confinement is 16384 MBytes
Number of cores is 4
Run identifier is r067-tall-165254777900067
=====================================================================

--------------------
preparation of the directory to be used:
/home/mcc/execution
total 20M
-rw-r--r-- 1 mcc users 8.0K Apr 29 19:20 CTLCardinality.txt
-rw-r--r-- 1 mcc users 85K Apr 29 19:20 CTLCardinality.xml
-rw-r--r-- 1 mcc users 6.0K Apr 29 19:19 CTLFireability.txt
-rw-r--r-- 1 mcc users 53K Apr 29 19:19 CTLFireability.xml
-rw-r--r-- 1 mcc users 4.2K May 10 09:33 GenericPropertiesDefinition.xml
-rw-r--r-- 1 mcc users 3.7K May 9 07:26 LTLCardinality.txt
-rw-r--r-- 1 mcc users 25K May 9 07:26 LTLCardinality.xml
-rw-r--r-- 1 mcc users 2.3K May 9 07:26 LTLFireability.txt
-rw-r--r-- 1 mcc users 17K May 9 07:26 LTLFireability.xml
-rw-r--r-- 1 mcc users 1.6K May 9 07:26 UpperBounds.txt
-rw-r--r-- 1 mcc users 3.7K May 9 07:26 UpperBounds.xml
-rw-r--r-- 1 mcc users 6 May 10 09:33 equiv_col
-rw-r--r-- 1 mcc users 3 May 10 09:33 instance
-rw-r--r-- 1 mcc users 6 May 10 09:33 iscolored
-rw-r--r-- 1 mcc users 20M May 10 09:33 model.pnml

--------------------
content from stdout:

=== Data for post analysis generated by BenchKit (invocation template)

The expected result is a vector of booleans
BOOL_VECTOR

FORMULA_NAME QuasiLiveness

=== Now, execution of the tool begins

BK_START 1652565807830

Running Version 202205111006
[2022-05-14 22:03:29] [INFO ] Running its-tools with arguments : [-pnfolder, /home/mcc/execution, -examination, QuasiLiveness, -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, 1800]
[2022-05-14 22:03:29] [INFO ] Parsing pnml file : /home/mcc/execution/model.pnml
[2022-05-14 22:03:30] [INFO ] Load time of PNML (sax parser for PT used): 1139 ms
[2022-05-14 22:03:31] [INFO ] Transformed 47560 places.
[2022-05-14 22:03:31] [INFO ] Transformed 76160 transitions.
[2022-05-14 22:03:31] [INFO ] Found NUPN structural information;
[2022-05-14 22:03:34] [INFO ] Parsed PT model containing 47560 places and 76160 transitions in 5925 ms.
Starting structural reductions in LIVENESS mode, iteration 0 : 47560/47560 places, 76160/76160 transitions.
Graph (trivial) has 42551 edges and 47560 vertex of which 2800 / 47560 are part of one of the 180 SCC in 115 ms
Free SCC test removed 2620 places
Ensure Unique test removed 2780 transitions
Reduce isomorphic transitions removed 2780 transitions.
Drop transitions removed 20711 transitions
Trivial Post-agglo rules discarded 20711 transitions
Performed 20711 trivial Post agglomeration. Transition count delta: 20711
Iterating post reduction 0 with 20711 rules applied. Total rules applied 20712 place count 44940 transition count 52669
Reduce places removed 20711 places and 0 transitions.
Ensure Unique test removed 450 transitions
Reduce isomorphic transitions removed 450 transitions.
Drop transitions removed 440 transitions
Trivial Post-agglo rules discarded 440 transitions
Performed 440 trivial Post agglomeration. Transition count delta: 440
Iterating post reduction 1 with 21601 rules applied. Total rules applied 42313 place count 24229 transition count 51779
Reduce places removed 440 places and 0 transitions.
Ensure Unique test removed 140 transitions
Reduce isomorphic transitions removed 140 transitions.
Drop transitions removed 140 transitions
Trivial Post-agglo rules discarded 140 transitions
Performed 140 trivial Post agglomeration. Transition count delta: 140
Iterating post reduction 2 with 720 rules applied. Total rules applied 43033 place count 23789 transition count 51499
Reduce places removed 140 places and 0 transitions.
Iterating post reduction 3 with 140 rules applied. Total rules applied 43173 place count 23649 transition count 51499
Performed 140 Pre agglomeration using Quasi-Persistent + Divergent Free condition..
Pre-agglomeration after 4 with 140 Pre rules applied. Total rules applied 43173 place count 23649 transition count 51359
Deduced a syphon composed of 140 places in 4416 ms
Reduce places removed 140 places and 0 transitions.
Iterating global reduction 4 with 280 rules applied. Total rules applied 43453 place count 23509 transition count 51359
Performed 13138 Post agglomeration using F-continuation condition.Transition count delta: 13138
Deduced a syphon composed of 13138 places in 7 ms
Reduce places removed 13138 places and 0 transitions.
Iterating global reduction 4 with 26276 rules applied. Total rules applied 69729 place count 10371 transition count 38221
Renaming transitions due to excessive name length > 1024 char.
Discarding 350 places :
Symmetric choice reduction at 4 with 350 rule applications. Total rules 70079 place count 10021 transition count 24991
Iterating global reduction 4 with 350 rules applied. Total rules applied 70429 place count 10021 transition count 24991
Ensure Unique test removed 320 transitions
Reduce isomorphic transitions removed 320 transitions.
Iterating post reduction 4 with 320 rules applied. Total rules applied 70749 place count 10021 transition count 24671
Performed 101 Post agglomeration using F-continuation condition.Transition count delta: -909
Deduced a syphon composed of 101 places in 12 ms
Reduce places removed 101 places and 0 transitions.
Iterating global reduction 5 with 202 rules applied. Total rules applied 70951 place count 9920 transition count 25580
Ensure Unique test removed 50 transitions
Reduce isomorphic transitions removed 50 transitions.
Iterating post reduction 5 with 50 rules applied. Total rules applied 71001 place count 9920 transition count 25530
Performed 101 Post agglomeration using F-continuation condition.Transition count delta: -1309
Deduced a syphon composed of 101 places in 6 ms
Reduce places removed 101 places and 0 transitions.
Iterating global reduction 6 with 202 rules applied. Total rules applied 71203 place count 9819 transition count 26839
Ensure Unique test removed 26 transitions
Reduce isomorphic transitions removed 26 transitions.
Iterating post reduction 6 with 26 rules applied. Total rules applied 71229 place count 9819 transition count 26813
Performed 101 Post agglomeration using F-continuation condition.Transition count delta: -1117
Deduced a syphon composed of 101 places in 12 ms
Reduce places removed 101 places and 0 transitions.
Iterating global reduction 7 with 202 rules applied. Total rules applied 71431 place count 9718 transition count 27930
Ensure Unique test removed 37 transitions
Reduce isomorphic transitions removed 37 transitions.
Iterating post reduction 7 with 37 rules applied. Total rules applied 71468 place count 9718 transition count 27893
Performed 94 Post agglomeration using F-continuation condition.Transition count delta: -1143
Deduced a syphon composed of 94 places in 6 ms
Reduce places removed 94 places and 0 transitions.
Iterating global reduction 8 with 188 rules applied. Total rules applied 71656 place count 9624 transition count 29036
Applied a total of 71656 rules in 24379 ms. Remains 9624 /47560 variables (removed 37936) and now considering 29036/76160 (removed 47124) transitions.
[2022-05-14 22:03:59] [INFO ] Flow matrix only has 27418 transitions (discarded 1618 similar events)
// Phase 1: matrix 27418 rows 9624 cols
[2022-05-14 22:03:59] [INFO ] Computed 3040 place invariants in 152 ms
[2022-05-14 22:04:00] [INFO ] Implicit Places using invariants in 1197 ms returned []
Implicit Place search using SMT only with invariants took 1225 ms to find 0 implicit places.
[2022-05-14 22:04:00] [INFO ] Flow matrix only has 27418 transitions (discarded 1618 similar events)
// Phase 1: matrix 27418 rows 9624 cols
[2022-05-14 22:04:00] [INFO ] Computed 3040 place invariants in 112 ms
[2022-05-14 22:04:01] [INFO ] Dead Transitions using invariants and state equation in 992 ms found 0 transitions.
Starting structural reductions in LIVENESS mode, iteration 1 : 9624/47560 places, 29036/76160 transitions.
Finished structural reductions, in 1 iterations. Remains : 9624/47560 places, 29036/76160 transitions.
Discarding 8752 transitions out of 29036. Remains 20284
Initial state reduction rules removed 1 formulas.
Ensure Unique test removed 27 transitions
Reduce redundant transitions removed 27 transitions.
Incomplete random walk after 10000 steps, including 2 resets, run finished after 4826 ms. (steps per millisecond=2 ) properties (out of 20283) seen :8015
Running SMT prover for 12268 properties.
[2022-05-14 22:04:07] [INFO ] Flow matrix only has 27418 transitions (discarded 1591 similar events)
// Phase 1: matrix 27418 rows 9624 cols
[2022-05-14 22:04:07] [INFO ] Computed 3040 place invariants in 74 ms
[2022-05-14 22:04:32] [WARNING] SMT solver failed with error :SMT solver raised an error when submitting script.... while checking expressions.
[2022-05-14 22:04:32] [INFO ] After 25035ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :0
Fused 12268 Parikh solutions to 1 different solutions.
Parikh walk visited 0 properties in 3 ms.
Support contains 6323 out of 9624 places. Attempting structural reductions.
Starting structural reductions in SAFETY mode, iteration 0 : 9624/9624 places, 29009/29009 transitions.
Drop transitions removed 190 transitions
Reduce isomorphic transitions removed 190 transitions.
Iterating post reduction 0 with 190 rules applied. Total rules applied 190 place count 9624 transition count 28819
Free-agglomeration rule applied 361 times.
Iterating global reduction 1 with 361 rules applied. Total rules applied 551 place count 9624 transition count 28458
Reduce places removed 361 places and 0 transitions.
Drop transitions removed 357 transitions
Reduce isomorphic transitions removed 357 transitions.
Iterating post reduction 1 with 718 rules applied. Total rules applied 1269 place count 9263 transition count 28101
Applied a total of 1269 rules in 1848 ms. Remains 9263 /9624 variables (removed 361) and now considering 28101/29009 (removed 908) transitions.
Finished structural reductions, in 1 iterations. Remains : 9263/9624 places, 28101/29009 transitions.
Interrupted random walk after 180004 steps, including 0 resets, run timeout after 30001 ms. (steps per millisecond=5 ) properties seen 12099
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 436 ms. (steps per millisecond=22 ) properties (out of 169) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 440 ms. (steps per millisecond=22 ) properties (out of 169) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 435 ms. (steps per millisecond=22 ) properties (out of 169) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 446 ms. (steps per millisecond=22 ) properties (out of 169) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 438 ms. (steps per millisecond=22 ) properties (out of 168) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 414 ms. (steps per millisecond=24 ) properties (out of 168) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 428 ms. (steps per millisecond=23 ) properties (out of 168) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 168) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 168) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 378 ms. (steps per millisecond=26 ) properties (out of 168) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 167) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 167) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 167) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 386 ms. (steps per millisecond=25 ) properties (out of 166) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 376 ms. (steps per millisecond=26 ) properties (out of 166) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 166) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 386 ms. (steps per millisecond=25 ) properties (out of 166) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 166) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 166) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 378 ms. (steps per millisecond=26 ) properties (out of 165) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 165) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 377 ms. (steps per millisecond=26 ) properties (out of 165) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 164) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 379 ms. (steps per millisecond=26 ) properties (out of 164) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 377 ms. (steps per millisecond=26 ) properties (out of 164) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 164) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 393 ms. (steps per millisecond=25 ) properties (out of 163) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 163) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 163) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 380 ms. (steps per millisecond=26 ) properties (out of 163) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 163) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 377 ms. (steps per millisecond=26 ) properties (out of 163) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 390 ms. (steps per millisecond=25 ) properties (out of 163) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 163) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 376 ms. (steps per millisecond=26 ) properties (out of 162) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 162) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 383 ms. (steps per millisecond=26 ) properties (out of 162) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 161) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 161) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 376 ms. (steps per millisecond=26 ) properties (out of 161) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 161) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 377 ms. (steps per millisecond=26 ) properties (out of 161) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 375 ms. (steps per millisecond=26 ) properties (out of 160) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 159) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 376 ms. (steps per millisecond=26 ) properties (out of 159) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 158) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 379 ms. (steps per millisecond=26 ) properties (out of 157) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 157) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 156) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 381 ms. (steps per millisecond=26 ) properties (out of 156) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 155) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 375 ms. (steps per millisecond=26 ) properties (out of 155) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 384 ms. (steps per millisecond=26 ) properties (out of 155) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 154) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 154) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 383 ms. (steps per millisecond=26 ) properties (out of 154) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 153) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 152) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 152) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 152) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 375 ms. (steps per millisecond=26 ) properties (out of 152) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 369 ms. (steps per millisecond=27 ) properties (out of 152) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 377 ms. (steps per millisecond=26 ) properties (out of 152) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 152) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 152) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 152) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 152) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 375 ms. (steps per millisecond=26 ) properties (out of 152) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 152) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 152) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 151) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 369 ms. (steps per millisecond=27 ) properties (out of 151) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 381 ms. (steps per millisecond=26 ) properties (out of 151) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 150) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 369 ms. (steps per millisecond=27 ) properties (out of 150) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 149) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 149) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 148) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 375 ms. (steps per millisecond=26 ) properties (out of 148) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 369 ms. (steps per millisecond=27 ) properties (out of 148) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 147) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 147) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 147) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 146) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 146) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 376 ms. (steps per millisecond=26 ) properties (out of 146) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 146) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 369 ms. (steps per millisecond=27 ) properties (out of 146) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 381 ms. (steps per millisecond=26 ) properties (out of 146) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 369 ms. (steps per millisecond=27 ) properties (out of 146) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 376 ms. (steps per millisecond=26 ) properties (out of 146) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 146) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 146) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 375 ms. (steps per millisecond=26 ) properties (out of 146) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 145) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 379 ms. (steps per millisecond=26 ) properties (out of 145) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 145) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 145) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 376 ms. (steps per millisecond=26 ) properties (out of 145) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 369 ms. (steps per millisecond=27 ) properties (out of 144) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 375 ms. (steps per millisecond=26 ) properties (out of 144) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 381 ms. (steps per millisecond=26 ) properties (out of 143) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 143) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 142) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 369 ms. (steps per millisecond=27 ) properties (out of 141) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 385 ms. (steps per millisecond=25 ) properties (out of 141) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 141) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 141) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 387 ms. (steps per millisecond=25 ) properties (out of 140) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 140) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 140) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 376 ms. (steps per millisecond=26 ) properties (out of 140) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 140) seen :1
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 380 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 379 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 384 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 377 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 384 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 381 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 367 ms. (steps per millisecond=27 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 368 ms. (steps per millisecond=27 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 376 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 369 ms. (steps per millisecond=27 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 368 ms. (steps per millisecond=27 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 384 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 369 ms. (steps per millisecond=27 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 381 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 382 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 368 ms. (steps per millisecond=27 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 370 ms. (steps per millisecond=27 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 378 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 371 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 378 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 374 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 377 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 375 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 372 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Incomplete Best-First random walk after 10001 steps, including 1 resets, run finished after 373 ms. (steps per millisecond=26 ) properties (out of 139) seen :0
Running SMT prover for 139 properties.
[2022-05-14 22:06:05] [INFO ] Flow matrix only has 26210 transitions (discarded 1891 similar events)
// Phase 1: matrix 26210 rows 9263 cols
[2022-05-14 22:06:05] [INFO ] Computed 3040 place invariants in 80 ms
[2022-05-14 22:06:23] [INFO ] [Real]Absence check using 3040 positive place invariants in 854 ms returned sat
[2022-05-14 22:08:26] [INFO ] After 104831ms SMT Verify possible using state equation in real domain returned unsat :0 sat :139
[2022-05-14 22:08:26] [INFO ] State equation strengthened by 4198 read => feed constraints.
[2022-05-14 22:09:50] [INFO ] After 84607ms SMT Verify possible using 4198 Read/Feed constraints in real domain returned unsat :0 sat :30 real:108
[2022-05-14 22:09:50] [INFO ] After 84609ms SMT Verify possible using trap constraints in real domain returned unsat :0 sat :30 real:108
Attempting to minimize the solution found.
Minimization took 10 ms.
[2022-05-14 22:09:50] [INFO ] After 225030ms SMT Verify possible using all constraints in real domain returned unsat :0 sat :30 real:108
[2022-05-14 22:10:08] [INFO ] [Nat]Absence check using 3040 positive place invariants in 940 ms returned sat
[2022-05-14 22:12:08] [INFO ] After 102782ms SMT Verify possible using state equation in natural domain returned unsat :0 sat :139
[2022-05-14 22:13:35] [INFO ] After 87413ms SMT Verify possible using 4198 Read/Feed constraints in natural domain returned unsat :0 sat :139
[2022-05-14 22:13:35] [INFO ] After 87415ms SMT Verify possible using trap constraints in natural domain returned unsat :0 sat :139
Attempting to minimize the solution found.
Minimization took 8 ms.
[2022-05-14 22:13:35] [INFO ] After 225030ms SMT Verify possible using all constraints in natural domain returned unsat :0 sat :139
Fused 139 Parikh solutions to 2 different solutions.
Parikh walk visited 0 properties in 16 ms.
Support contains 224 out of 9263 places. Attempting structural reductions.
Starting structural reductions in SAFETY mode, iteration 0 : 9263/9263 places, 28101/28101 transitions.
Discarding 140 places :
Symmetric choice reduction at 0 with 140 rule applications. Total rules 140 place count 9123 transition count 25304
Iterating global reduction 0 with 140 rules applied. Total rules applied 280 place count 9123 transition count 25304
Ensure Unique test removed 1158 transitions
Reduce isomorphic transitions removed 1158 transitions.
Iterating post reduction 0 with 1158 rules applied. Total rules applied 1438 place count 9123 transition count 24146
Performed 27 Post agglomeration using F-continuation condition.Transition count delta: -216
Deduced a syphon composed of 27 places in 4 ms
Reduce places removed 27 places and 0 transitions.
Iterating global reduction 1 with 54 rules applied. Total rules applied 1492 place count 9096 transition count 24362
Free-agglomeration rule applied 5627 times with reduction of 1725 identical transitions.
Iterating global reduction 1 with 5627 rules applied. Total rules applied 7119 place count 9096 transition count 17010
Reduce places removed 5627 places and 0 transitions.
Drop transitions removed 6898 transitions
Ensure Unique test removed 76 transitions
Reduce isomorphic transitions removed 6974 transitions.
Graph (complete) has 13665 edges and 3469 vertex of which 3333 are kept as prefixes of interest. Removing 136 places using SCC suffix rule.11 ms
Discarding 136 places :
Also discarding 0 output transitions
Iterating post reduction 1 with 12602 rules applied. Total rules applied 19721 place count 3333 transition count 10036
Drop transitions removed 1360 transitions
Reduce isomorphic transitions removed 1360 transitions.
Iterating post reduction 2 with 1360 rules applied. Total rules applied 21081 place count 3333 transition count 8676
Discarding 1325 places :
Symmetric choice reduction at 3 with 1325 rule applications. Total rules 22406 place count 2008 transition count 6011
Iterating global reduction 3 with 1325 rules applied. Total rules applied 23731 place count 2008 transition count 6011
Drop transitions removed 44 transitions
Redundant transition composition rules discarded 44 transitions
Iterating global reduction 3 with 44 rules applied. Total rules applied 23775 place count 2008 transition count 5967
Discarding 20 places :
Symmetric choice reduction at 3 with 20 rule applications. Total rules 23795 place count 1988 transition count 5947
Iterating global reduction 3 with 20 rules applied. Total rules applied 23815 place count 1988 transition count 5947
Discarding 20 places :
Symmetric choice reduction at 3 with 20 rule applications. Total rules 23835 place count 1968 transition count 4305
Iterating global reduction 3 with 20 rules applied. Total rules applied 23855 place count 1968 transition count 4305
Ensure Unique test removed 20 transitions
Reduce isomorphic transitions removed 20 transitions.
Iterating post reduction 3 with 20 rules applied. Total rules applied 23875 place count 1968 transition count 4285
Performed 10 Post agglomeration using F-continuation condition.Transition count delta: 10
Deduced a syphon composed of 10 places in 1 ms
Reduce places removed 10 places and 0 transitions.
Iterating global reduction 4 with 20 rules applied. Total rules applied 23895 place count 1958 transition count 4275
Drop transitions removed 1 transitions
Redundant transition composition rules discarded 1 transitions
Iterating global reduction 4 with 1 rules applied. Total rules applied 23896 place count 1958 transition count 4274
Free-agglomeration rule applied 10 times.
Iterating global reduction 4 with 10 rules applied. Total rules applied 23906 place count 1958 transition count 4264
Reduce places removed 10 places and 0 transitions.
Drop transitions removed 820 transitions
Reduce isomorphic transitions removed 820 transitions.
Graph (complete) has 5525 edges and 1948 vertex of which 1938 are kept as prefixes of interest. Removing 10 places using SCC suffix rule.2 ms
Discarding 10 places :
Also discarding 0 output transitions
Iterating post reduction 4 with 831 rules applied. Total rules applied 24737 place count 1938 transition count 3444
Discarding 643 places :
Symmetric choice reduction at 5 with 643 rule applications. Total rules 25380 place count 1295 transition count 2200
Iterating global reduction 5 with 643 rules applied. Total rules applied 26023 place count 1295 transition count 2200
Applied a total of 26023 rules in 10062 ms. Remains 1295 /9263 variables (removed 7968) and now considering 2200/28101 (removed 25901) transitions.
Finished structural reductions, in 1 iterations. Remains : 1295/9263 places, 2200/28101 transitions.
Finished random walk after 4738 steps, including 0 resets, run visited all 139 properties in 371 ms. (steps per millisecond=12 )
Able to resolve query QuasiLiveness after proving 20284 properties.
FORMULA QuasiLiveness TRUE TECHNIQUES RANDOM_WALK BESTFIRST_WALK TOPOLOGICAL INITIAL_STATE
Total runtime 617244 ms.

BK_STOP 1652566426394

--------------------
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
+ [[ QuasiLiveness = StateSpace ]]
+ /home/mcc/BenchKit/bin//..//runeclipse.sh /home/mcc/execution QuasiLiveness -its -ltsmin -greatspnpath /home/mcc/BenchKit/bin//..//greatspn/ -order META -manyOrder -smt -timeout 1800
+ 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 QuasiLiveness -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 1800 -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="DLCflexbar-PT-8b"
export BK_EXAMINATION="QuasiLiveness"
export BK_TOOL="itstools"
export BK_RESULT_DIR="/tmp/BK_RESULTS/OUTPUTS"
export BK_TIME_CONFINEMENT="1800"
export BK_MEMORY_CONFINEMENT="16384"
export BK_BIN_PATH="/home/mcc/BenchKit/bin/"

# this is specific to your benchmark or test

export BIN_DIR="$HOME/BenchKit/bin"

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

# this is for BenchKit: explicit launching of the test
echo "====================================================================="
echo " Generated by BenchKit 2-4028"
echo " Executing tool itstools"
echo " Input is DLCflexbar-PT-8b, examination is QuasiLiveness"
echo " Time confinement is $BK_TIME_CONFINEMENT seconds"
echo " Memory confinement is 16384 MBytes"
echo " Number of cores is 4"
echo " Run identifier is r067-tall-165254777900067"
echo "====================================================================="
echo
echo "--------------------"
echo "preparation of the directory to be used:"

tar xzf /home/mcc/BenchKit/INPUTS/DLCflexbar-PT-8b.tgz
mv DLCflexbar-PT-8b execution
cd execution
if [ "QuasiLiveness" = "ReachabilityDeadlock" ] || [ "QuasiLiveness" = "UpperBounds" ] || [ "QuasiLiveness" = "QuasiLiveness" ] || [ "QuasiLiveness" = "StableMarking" ] || [ "QuasiLiveness" = "Liveness" ] || [ "QuasiLiveness" = "OneSafe" ] || [ "QuasiLiveness" = "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 [ "QuasiLiveness" = "UpperBounds" ] ; then
echo "The expected result is a vector of positive values"
echo NUM_VECTOR
elif [ "QuasiLiveness" != "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 "QuasiLiveness.txt" ] ; then
echo "here is the order used to build the result vector(from text file)"
for x in $(grep Property QuasiLiveness.txt | cut -d ' ' -f 2 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ -f "QuasiLiveness.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 '' QuasiLiveness.xml | cut -d '>' -f 2 | cut -d '<' -f 1 | sort -u) ; do
echo "FORMULA_NAME $x"
done
elif [ "QuasiLiveness" = "ReachabilityDeadlock" ] || [ "QuasiLiveness" = "QuasiLiveness" ] || [ "QuasiLiveness" = "StableMarking" ] || [ "QuasiLiveness" = "Liveness" ] || [ "QuasiLiveness" = "OneSafe" ] ; then
echo "FORMULA_NAME QuasiLiveness"
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 ;