/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:30:12,315 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:30:12,318 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:30:12,339 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:30:12,339 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:30:12,342 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:30:12,344 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:30:12,355 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:30:12,360 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:30:12,364 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:30:12,365 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:30:12,367 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:30:12,367 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:30:12,369 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:30:12,371 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:30:12,373 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:30:12,374 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:30:12,375 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:30:12,376 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:30:12,382 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:30:12,387 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:30:12,391 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:30:12,392 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:30:12,393 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:30:12,396 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:30:12,407 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:30:12,408 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:30:12,410 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:30:12,412 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 19:30:12,451 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:30:12,451 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:30:12,453 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:30:12,453 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:30:12,453 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:30:12,453 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:30:12,453 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:30:12,454 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:30:12,454 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:30:12,454 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:30:12,454 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:30:12,454 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:30:12,454 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:30:12,455 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:30:12,455 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:30:12,455 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:30:12,457 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:30:12,457 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:30:12,457 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:30:12,457 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:30:12,457 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:30:12,458 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:30:12,458 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:30:12,458 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:30:12,458 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:30:12,458 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:30:12,459 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:12,459 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:30:12,459 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:30:12,459 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:30:12,757 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:30:12,774 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:30:12,778 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:30:12,780 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:30:12,780 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:30:12,782 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c [2020-07-21 19:30:12,868 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8b8930009/48d42c339b244e41a7476282fe754e74/FLAGb0835e91e [2020-07-21 19:30:13,442 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:30:13,442 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_2calls_10-1.c [2020-07-21 19:30:13,452 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8b8930009/48d42c339b244e41a7476282fe754e74/FLAGb0835e91e [2020-07-21 19:30:13,802 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/8b8930009/48d42c339b244e41a7476282fe754e74 [2020-07-21 19:30:13,810 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:30:13,814 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:30:13,815 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:30:13,815 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:30:13,819 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:30:13,820 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:30:13" (1/1) ... [2020-07-21 19:30:13,823 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@654517d4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:13, skipping insertion in model container [2020-07-21 19:30:13,823 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:30:13" (1/1) ... [2020-07-21 19:30:13,832 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:30:13,851 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:30:14,024 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:30:14,030 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:30:14,050 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:30:14,067 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:30:14,068 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:14 WrapperNode [2020-07-21 19:30:14,068 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:30:14,069 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:30:14,069 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:30:14,069 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:30:14,084 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:14" (1/1) ... [2020-07-21 19:30:14,084 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:14" (1/1) ... [2020-07-21 19:30:14,188 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:14" (1/1) ... [2020-07-21 19:30:14,188 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:14" (1/1) ... [2020-07-21 19:30:14,193 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:14" (1/1) ... [2020-07-21 19:30:14,195 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:14" (1/1) ... [2020-07-21 19:30:14,197 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:14" (1/1) ... [2020-07-21 19:30:14,199 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:30:14,199 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:30:14,200 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:30:14,200 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:30:14,201 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:14" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:30:14,272 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:30:14,272 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:30:14,272 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo1 [2020-07-21 19:30:14,272 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo2 [2020-07-21 19:30:14,272 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:30:14,273 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:30:14,273 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:30:14,273 INFO L130 BoogieDeclarations]: Found specification of procedure fibo1 [2020-07-21 19:30:14,273 INFO L130 BoogieDeclarations]: Found specification of procedure fibo2 [2020-07-21 19:30:14,273 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:30:14,273 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:30:14,273 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:30:14,493 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:30:14,494 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:30:14,498 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:30:14 BoogieIcfgContainer [2020-07-21 19:30:14,499 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:30:14,500 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:30:14,500 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:30:14,505 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:30:14,505 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:30:13" (1/3) ... [2020-07-21 19:30:14,507 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41ebf98e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:30:14, skipping insertion in model container [2020-07-21 19:30:14,507 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:14" (2/3) ... [2020-07-21 19:30:14,507 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@41ebf98e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:30:14, skipping insertion in model container [2020-07-21 19:30:14,507 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:30:14" (3/3) ... [2020-07-21 19:30:14,510 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_2calls_10-1.c [2020-07-21 19:30:14,521 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:30:14,531 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:30:14,553 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:30:14,585 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:30:14,586 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:30:14,586 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:30:14,586 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:30:14,586 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:30:14,586 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:30:14,586 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:30:14,587 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:30:14,623 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-07-21 19:30:14,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:30:14,632 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:14,633 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:14,634 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:14,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:14,642 INFO L82 PathProgramCache]: Analyzing trace with hash 1464461757, now seen corresponding path program 1 times [2020-07-21 19:30:14,654 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:14,662 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [601027917] [2020-07-21 19:30:14,663 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:14,742 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:30:14,743 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:14,746 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:30:14,754 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:14,846 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:30:14,847 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:30:14,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [601027917] [2020-07-21 19:30:14,849 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:30:14,850 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:30:14,851 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1211184975] [2020-07-21 19:30:14,859 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:30:14,859 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:14,870 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:30:14,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:30:14,873 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 5 states. [2020-07-21 19:30:15,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:15,004 INFO L93 Difference]: Finished difference Result 44 states and 53 transitions. [2020-07-21 19:30:15,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:30:15,006 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:30:15,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:15,020 INFO L225 Difference]: With dead ends: 44 [2020-07-21 19:30:15,020 INFO L226 Difference]: Without dead ends: 30 [2020-07-21 19:30:15,025 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:30:15,045 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-07-21 19:30:15,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2020-07-21 19:30:15,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 19:30:15,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 19:30:15,079 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 13 [2020-07-21 19:30:15,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:15,080 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 19:30:15,080 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:30:15,080 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 19:30:15,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 19:30:15,083 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:15,083 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:15,298 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:15,299 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:15,299 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:15,300 INFO L82 PathProgramCache]: Analyzing trace with hash -1134800479, now seen corresponding path program 1 times [2020-07-21 19:30:15,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:15,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1094892545] [2020-07-21 19:30:15,302 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:15,332 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:30:15,333 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:15,335 INFO L263 TraceCheckSpWp]: Trace formula consists of 20 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:30:15,337 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:15,383 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:30:15,383 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:30:15,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1094892545] [2020-07-21 19:30:15,384 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:30:15,384 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:30:15,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [623167359] [2020-07-21 19:30:15,389 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:30:15,390 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:15,390 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:30:15,391 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:30:15,391 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 5 states. [2020-07-21 19:30:15,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:15,512 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-07-21 19:30:15,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:30:15,514 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 19:30:15,515 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:15,516 INFO L225 Difference]: With dead ends: 36 [2020-07-21 19:30:15,517 INFO L226 Difference]: Without dead ends: 32 [2020-07-21 19:30:15,519 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:30:15,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-07-21 19:30:15,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 30. [2020-07-21 19:30:15,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-07-21 19:30:15,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 37 transitions. [2020-07-21 19:30:15,539 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 37 transitions. Word has length 14 [2020-07-21 19:30:15,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:15,540 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 37 transitions. [2020-07-21 19:30:15,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:30:15,540 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 37 transitions. [2020-07-21 19:30:15,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:30:15,542 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:15,543 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:15,756 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:15,757 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:15,758 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:15,758 INFO L82 PathProgramCache]: Analyzing trace with hash -1592795560, now seen corresponding path program 1 times [2020-07-21 19:30:15,759 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:15,760 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1404409624] [2020-07-21 19:30:15,760 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:15,795 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:15,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:15,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 59 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:30:15,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:15,860 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:30:15,861 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:16,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:16,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:16,103 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:30:16,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1404409624] [2020-07-21 19:30:16,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:16,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 19:30:16,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1639539779] [2020-07-21 19:30:16,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 19:30:16,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:16,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 19:30:16,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:30:16,106 INFO L87 Difference]: Start difference. First operand 30 states and 37 transitions. Second operand 10 states. [2020-07-21 19:30:16,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:16,260 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2020-07-21 19:30:16,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:30:16,262 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 26 [2020-07-21 19:30:16,263 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:16,264 INFO L225 Difference]: With dead ends: 41 [2020-07-21 19:30:16,264 INFO L226 Difference]: Without dead ends: 37 [2020-07-21 19:30:16,267 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:30:16,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-07-21 19:30:16,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 35. [2020-07-21 19:30:16,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 19:30:16,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 19:30:16,294 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 26 [2020-07-21 19:30:16,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:16,295 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 19:30:16,297 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 19:30:16,297 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 19:30:16,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:30:16,302 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:16,303 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:16,517 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:16,518 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:16,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:16,518 INFO L82 PathProgramCache]: Analyzing trace with hash 746633022, now seen corresponding path program 1 times [2020-07-21 19:30:16,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:16,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1938150431] [2020-07-21 19:30:16,519 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:16,554 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:16,554 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:16,555 INFO L263 TraceCheckSpWp]: Trace formula consists of 61 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:30:16,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:16,609 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:30:16,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:16,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:16,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:16,774 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-21 19:30:16,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1938150431] [2020-07-21 19:30:16,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:16,775 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 10 [2020-07-21 19:30:16,775 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667461972] [2020-07-21 19:30:16,776 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-07-21 19:30:16,776 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:16,776 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-07-21 19:30:16,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=68, Unknown=0, NotChecked=0, Total=90 [2020-07-21 19:30:16,777 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 10 states. [2020-07-21 19:30:16,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:16,888 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2020-07-21 19:30:16,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:30:16,888 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-07-21 19:30:16,889 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:16,890 INFO L225 Difference]: With dead ends: 46 [2020-07-21 19:30:16,891 INFO L226 Difference]: Without dead ends: 42 [2020-07-21 19:30:16,892 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 42 SyntacticMatches, 4 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:30:16,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-07-21 19:30:16,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2020-07-21 19:30:16,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-07-21 19:30:16,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2020-07-21 19:30:16,901 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 27 [2020-07-21 19:30:16,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:16,901 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2020-07-21 19:30:16,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-07-21 19:30:16,901 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2020-07-21 19:30:16,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 19:30:16,903 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:16,903 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:17,118 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:17,119 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:17,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:17,121 INFO L82 PathProgramCache]: Analyzing trace with hash 986908919, now seen corresponding path program 1 times [2020-07-21 19:30:17,121 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:17,122 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1551373967] [2020-07-21 19:30:17,122 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:17,159 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:17,160 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:17,160 INFO L263 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:30:17,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:17,238 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 19:30:17,238 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:17,540 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:17,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:17,611 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:17,656 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:30:17,657 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1551373967] [2020-07-21 19:30:17,657 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:17,657 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 19:30:17,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [112151226] [2020-07-21 19:30:17,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 19:30:17,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:17,659 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 19:30:17,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:30:17,659 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand 12 states. [2020-07-21 19:30:17,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:17,856 INFO L93 Difference]: Finished difference Result 51 states and 72 transitions. [2020-07-21 19:30:17,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:30:17,856 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 39 [2020-07-21 19:30:17,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:17,859 INFO L225 Difference]: With dead ends: 51 [2020-07-21 19:30:17,859 INFO L226 Difference]: Without dead ends: 47 [2020-07-21 19:30:17,863 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 63 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:30:17,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-07-21 19:30:17,880 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 40. [2020-07-21 19:30:17,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 19:30:17,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 19:30:17,882 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 39 [2020-07-21 19:30:17,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:17,882 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 19:30:17,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 19:30:17,883 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 19:30:17,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-07-21 19:30:17,885 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:17,885 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:18,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:18,093 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:18,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:18,093 INFO L82 PathProgramCache]: Analyzing trace with hash -2100495745, now seen corresponding path program 1 times [2020-07-21 19:30:18,094 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:18,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [9927549] [2020-07-21 19:30:18,095 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:18,132 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:18,133 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:18,134 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:30:18,136 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:18,195 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-21 19:30:18,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:18,436 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:18,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:18,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:18,534 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 2 proven. 11 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:30:18,534 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [9927549] [2020-07-21 19:30:18,535 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:18,535 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9] total 12 [2020-07-21 19:30:18,535 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203033364] [2020-07-21 19:30:18,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 19:30:18,536 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:18,536 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 19:30:18,537 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2020-07-21 19:30:18,537 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 12 states. [2020-07-21 19:30:18,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:18,689 INFO L93 Difference]: Finished difference Result 56 states and 84 transitions. [2020-07-21 19:30:18,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:30:18,697 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 40 [2020-07-21 19:30:18,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:18,704 INFO L225 Difference]: With dead ends: 56 [2020-07-21 19:30:18,705 INFO L226 Difference]: Without dead ends: 52 [2020-07-21 19:30:18,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 66 SyntacticMatches, 6 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:30:18,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-07-21 19:30:18,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 40. [2020-07-21 19:30:18,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-07-21 19:30:18,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 54 transitions. [2020-07-21 19:30:18,737 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 54 transitions. Word has length 40 [2020-07-21 19:30:18,738 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:18,738 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 54 transitions. [2020-07-21 19:30:18,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 19:30:18,739 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 54 transitions. [2020-07-21 19:30:18,746 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-07-21 19:30:18,747 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:18,747 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:18,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:18,951 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:18,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:18,952 INFO L82 PathProgramCache]: Analyzing trace with hash -209212298, now seen corresponding path program 2 times [2020-07-21 19:30:18,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:18,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1216409838] [2020-07-21 19:30:18,952 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:18,994 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:18,994 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:18,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 117 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:30:18,998 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:19,072 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2020-07-21 19:30:19,073 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:19,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:19,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:19,580 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:19,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:19,678 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 4 proven. 25 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 19:30:19,679 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1216409838] [2020-07-21 19:30:19,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:19,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 19:30:19,680 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331944923] [2020-07-21 19:30:19,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:30:19,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:19,680 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:30:19,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:30:19,681 INFO L87 Difference]: Start difference. First operand 40 states and 54 transitions. Second operand 14 states. [2020-07-21 19:30:19,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:19,899 INFO L93 Difference]: Finished difference Result 61 states and 96 transitions. [2020-07-21 19:30:19,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:30:19,899 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 52 [2020-07-21 19:30:19,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:19,902 INFO L225 Difference]: With dead ends: 61 [2020-07-21 19:30:19,902 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 19:30:19,903 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 86 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:30:19,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 19:30:19,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 45. [2020-07-21 19:30:19,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 19:30:19,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 19:30:19,913 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 52 [2020-07-21 19:30:19,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:19,914 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 19:30:19,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:30:19,914 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 19:30:19,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-07-21 19:30:19,916 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:19,916 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:20,123 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:20,124 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:20,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:20,125 INFO L82 PathProgramCache]: Analyzing trace with hash -405677468, now seen corresponding path program 1 times [2020-07-21 19:30:20,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:20,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [512377844] [2020-07-21 19:30:20,127 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:20,170 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:20,170 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:20,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:30:20,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:20,236 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 23 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2020-07-21 19:30:20,239 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:20,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:20,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:20,690 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:20,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:20,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:20,794 INFO L134 CoverageAnalysis]: Checked inductivity of 44 backedges. 4 proven. 28 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2020-07-21 19:30:20,794 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [512377844] [2020-07-21 19:30:20,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:20,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11] total 14 [2020-07-21 19:30:20,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [743743796] [2020-07-21 19:30:20,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-07-21 19:30:20,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:20,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-07-21 19:30:20,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=144, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:30:20,797 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 14 states. [2020-07-21 19:30:21,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:21,012 INFO L93 Difference]: Finished difference Result 66 states and 110 transitions. [2020-07-21 19:30:21,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:30:21,013 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 54 [2020-07-21 19:30:21,014 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:21,016 INFO L225 Difference]: With dead ends: 66 [2020-07-21 19:30:21,016 INFO L226 Difference]: Without dead ends: 62 [2020-07-21 19:30:21,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 90 SyntacticMatches, 8 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:30:21,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-07-21 19:30:21,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 45. [2020-07-21 19:30:21,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-07-21 19:30:21,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 64 transitions. [2020-07-21 19:30:21,038 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 64 transitions. Word has length 54 [2020-07-21 19:30:21,039 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:21,039 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 64 transitions. [2020-07-21 19:30:21,039 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-07-21 19:30:21,039 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 64 transitions. [2020-07-21 19:30:21,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-07-21 19:30:21,041 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:21,042 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 5, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:21,254 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:21,255 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:21,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:21,256 INFO L82 PathProgramCache]: Analyzing trace with hash -975547772, now seen corresponding path program 3 times [2020-07-21 19:30:21,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:21,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1975531145] [2020-07-21 19:30:21,258 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:21,317 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:21,318 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:21,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 175 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:30:21,322 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:21,381 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 60 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2020-07-21 19:30:21,382 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:21,957 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:21,959 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,325 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 12 proven. 68 refuted. 0 times theorem prover too weak. 48 trivial. 0 not checked. [2020-07-21 19:30:22,326 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1975531145] [2020-07-21 19:30:22,327 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:22,327 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 19:30:22,327 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129555136] [2020-07-21 19:30:22,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:30:22,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:22,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:30:22,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:30:22,329 INFO L87 Difference]: Start difference. First operand 45 states and 64 transitions. Second operand 16 states. [2020-07-21 19:30:22,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:22,590 INFO L93 Difference]: Finished difference Result 71 states and 124 transitions. [2020-07-21 19:30:22,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:30:22,590 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 78 [2020-07-21 19:30:22,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:22,592 INFO L225 Difference]: With dead ends: 71 [2020-07-21 19:30:22,592 INFO L226 Difference]: Without dead ends: 67 [2020-07-21 19:30:22,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 134 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:30:22,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-07-21 19:30:22,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 50. [2020-07-21 19:30:22,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 19:30:22,605 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 19:30:22,605 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 78 [2020-07-21 19:30:22,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:22,605 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 19:30:22,606 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:30:22,606 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 19:30:22,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-07-21 19:30:22,607 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:22,608 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 7, 6, 6, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:22,821 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:22,822 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:22,822 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:22,823 INFO L82 PathProgramCache]: Analyzing trace with hash 1891337214, now seen corresponding path program 2 times [2020-07-21 19:30:22,823 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:22,824 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [140963725] [2020-07-21 19:30:22,824 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:22,895 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:22,896 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:22,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:30:22,901 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:22,974 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 115 refuted. 0 times theorem prover too weak. 135 trivial. 0 not checked. [2020-07-21 19:30:22,974 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:23,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:23,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:23,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:23,842 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:23,896 INFO L134 CoverageAnalysis]: Checked inductivity of 267 backedges. 17 proven. 125 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2020-07-21 19:30:23,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [140963725] [2020-07-21 19:30:23,898 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:23,898 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 13] total 16 [2020-07-21 19:30:23,898 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1477909951] [2020-07-21 19:30:23,899 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-21 19:30:23,899 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:23,900 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-21 19:30:23,900 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=192, Unknown=0, NotChecked=0, Total=240 [2020-07-21 19:30:23,900 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 16 states. [2020-07-21 19:30:24,138 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:24,139 INFO L93 Difference]: Finished difference Result 76 states and 140 transitions. [2020-07-21 19:30:24,139 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:30:24,139 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 108 [2020-07-21 19:30:24,140 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:24,142 INFO L225 Difference]: With dead ends: 76 [2020-07-21 19:30:24,142 INFO L226 Difference]: Without dead ends: 72 [2020-07-21 19:30:24,145 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 221 GetRequests, 192 SyntacticMatches, 10 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 67 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=89, Invalid=331, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:30:24,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-07-21 19:30:24,175 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 50. [2020-07-21 19:30:24,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-07-21 19:30:24,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 75 transitions. [2020-07-21 19:30:24,182 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 75 transitions. Word has length 108 [2020-07-21 19:30:24,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:24,183 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 75 transitions. [2020-07-21 19:30:24,183 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-21 19:30:24,183 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 75 transitions. [2020-07-21 19:30:24,189 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 209 [2020-07-21 19:30:24,189 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:24,190 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 13, 13, 12, 9, 9, 9, 9, 9, 9, 9, 9, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:24,402 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:24,403 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:24,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:24,404 INFO L82 PathProgramCache]: Analyzing trace with hash -815433282, now seen corresponding path program 4 times [2020-07-21 19:30:24,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:24,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1512515097] [2020-07-21 19:30:24,405 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:24,512 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:24,512 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:24,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:30:24,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:24,635 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 332 refuted. 0 times theorem prover too weak. 800 trivial. 0 not checked. [2020-07-21 19:30:24,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:25,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:25,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:25,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:26,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:26,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:26,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:26,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:26,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:26,298 INFO L134 CoverageAnalysis]: Checked inductivity of 1179 backedges. 47 proven. 346 refuted. 0 times theorem prover too weak. 786 trivial. 0 not checked. [2020-07-21 19:30:26,298 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1512515097] [2020-07-21 19:30:26,298 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:26,299 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 19:30:26,299 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2115609851] [2020-07-21 19:30:26,300 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:30:26,300 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:26,300 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:30:26,300 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:30:26,301 INFO L87 Difference]: Start difference. First operand 50 states and 75 transitions. Second operand 18 states. [2020-07-21 19:30:26,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:26,581 INFO L93 Difference]: Finished difference Result 81 states and 156 transitions. [2020-07-21 19:30:26,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:30:26,582 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 208 [2020-07-21 19:30:26,582 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:26,584 INFO L225 Difference]: With dead ends: 81 [2020-07-21 19:30:26,584 INFO L226 Difference]: Without dead ends: 77 [2020-07-21 19:30:26,585 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 389 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 19:30:26,585 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-07-21 19:30:26,594 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 55. [2020-07-21 19:30:26,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 19:30:26,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-21 19:30:26,596 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 208 [2020-07-21 19:30:26,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:26,597 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-21 19:30:26,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:30:26,597 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-21 19:30:26,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2020-07-21 19:30:26,599 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:26,599 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 7, 7, 7, 5, 5, 5, 5, 5, 5, 5, 5, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:26,814 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:26,815 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:26,815 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:26,816 INFO L82 PathProgramCache]: Analyzing trace with hash 1180347891, now seen corresponding path program 2 times [2020-07-21 19:30:26,816 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:26,816 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [60329624] [2020-07-21 19:30:26,817 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:26,899 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:26,899 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:26,900 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:30:26,902 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:26,978 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 149 refuted. 0 times theorem prover too weak. 174 trivial. 0 not checked. [2020-07-21 19:30:26,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:27,858 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,227 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,312 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:28,419 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 24 proven. 165 refuted. 0 times theorem prover too weak. 158 trivial. 0 not checked. [2020-07-21 19:30:28,419 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [60329624] [2020-07-21 19:30:28,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:28,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 15] total 18 [2020-07-21 19:30:28,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205567485] [2020-07-21 19:30:28,422 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-21 19:30:28,422 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:28,422 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-21 19:30:28,423 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=248, Unknown=0, NotChecked=0, Total=306 [2020-07-21 19:30:28,423 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 18 states. [2020-07-21 19:30:28,701 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:28,701 INFO L93 Difference]: Finished difference Result 86 states and 174 transitions. [2020-07-21 19:30:28,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:30:28,702 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 121 [2020-07-21 19:30:28,703 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:28,705 INFO L225 Difference]: With dead ends: 86 [2020-07-21 19:30:28,705 INFO L226 Difference]: Without dead ends: 82 [2020-07-21 19:30:28,706 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 248 GetRequests, 214 SyntacticMatches, 12 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 101 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=112, Invalid=440, Unknown=0, NotChecked=0, Total=552 [2020-07-21 19:30:28,706 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-07-21 19:30:28,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 55. [2020-07-21 19:30:28,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-21 19:30:28,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 87 transitions. [2020-07-21 19:30:28,716 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 87 transitions. Word has length 121 [2020-07-21 19:30:28,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:28,716 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 87 transitions. [2020-07-21 19:30:28,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-21 19:30:28,717 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 87 transitions. [2020-07-21 19:30:28,719 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 196 [2020-07-21 19:30:28,719 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:28,719 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 11, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:28,941 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:28,941 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:28,942 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:28,942 INFO L82 PathProgramCache]: Analyzing trace with hash 2099307065, now seen corresponding path program 5 times [2020-07-21 19:30:28,943 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:28,943 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1816420113] [2020-07-21 19:30:28,943 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:29,069 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:29,070 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:29,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 436 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:30:29,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:29,172 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 331 refuted. 0 times theorem prover too weak. 630 trivial. 0 not checked. [2020-07-21 19:30:29,172 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:30,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:30,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:30,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,106 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,349 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,351 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,484 INFO L134 CoverageAnalysis]: Checked inductivity of 1023 backedges. 62 proven. 352 refuted. 0 times theorem prover too weak. 609 trivial. 0 not checked. [2020-07-21 19:30:31,485 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1816420113] [2020-07-21 19:30:31,485 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:31,485 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 19:30:31,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945777672] [2020-07-21 19:30:31,486 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 19:30:31,486 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:31,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 19:30:31,487 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:30:31,487 INFO L87 Difference]: Start difference. First operand 55 states and 87 transitions. Second operand 20 states. [2020-07-21 19:30:31,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:31,896 INFO L93 Difference]: Finished difference Result 91 states and 192 transitions. [2020-07-21 19:30:31,897 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:30:31,897 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 195 [2020-07-21 19:30:31,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:31,901 INFO L225 Difference]: With dead ends: 91 [2020-07-21 19:30:31,901 INFO L226 Difference]: Without dead ends: 87 [2020-07-21 19:30:31,902 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 398 GetRequests, 359 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:30:31,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-07-21 19:30:31,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 60. [2020-07-21 19:30:31,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 19:30:31,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-21 19:30:31,913 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 195 [2020-07-21 19:30:31,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:31,914 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-21 19:30:31,914 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 19:30:31,914 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-21 19:30:31,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 202 [2020-07-21 19:30:31,917 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:31,917 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 12, 12, 12, 8, 8, 8, 8, 8, 8, 8, 8, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:32,132 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:32,133 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:32,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:32,134 INFO L82 PathProgramCache]: Analyzing trace with hash 266210309, now seen corresponding path program 3 times [2020-07-21 19:30:32,134 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:32,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [181414401] [2020-07-21 19:30:32,135 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:32,268 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:32,269 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:32,270 INFO L263 TraceCheckSpWp]: Trace formula consists of 448 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:30:32,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:32,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 347 refuted. 0 times theorem prover too weak. 658 trivial. 0 not checked. [2020-07-21 19:30:32,390 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:33,726 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:34,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:34,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:34,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:34,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:34,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:34,662 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:34,716 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:34,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1074 backedges. 69 proven. 371 refuted. 0 times theorem prover too weak. 634 trivial. 0 not checked. [2020-07-21 19:30:34,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [181414401] [2020-07-21 19:30:34,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:34,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 20 [2020-07-21 19:30:34,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799473595] [2020-07-21 19:30:34,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-07-21 19:30:34,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:34,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-07-21 19:30:34,790 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=70, Invalid=310, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:30:34,790 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 20 states. [2020-07-21 19:30:35,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:35,127 INFO L93 Difference]: Finished difference Result 96 states and 212 transitions. [2020-07-21 19:30:35,127 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:30:35,127 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 201 [2020-07-21 19:30:35,128 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:35,133 INFO L225 Difference]: With dead ends: 96 [2020-07-21 19:30:35,133 INFO L226 Difference]: Without dead ends: 92 [2020-07-21 19:30:35,134 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 409 GetRequests, 370 SyntacticMatches, 14 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 142 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=141, Invalid=561, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:30:35,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-07-21 19:30:35,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 60. [2020-07-21 19:30:35,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-07-21 19:30:35,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 100 transitions. [2020-07-21 19:30:35,150 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 100 transitions. Word has length 201 [2020-07-21 19:30:35,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:35,151 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 100 transitions. [2020-07-21 19:30:35,151 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-07-21 19:30:35,151 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 100 transitions. [2020-07-21 19:30:35,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-21 19:30:35,156 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:35,157 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 22, 21, 21, 16, 16, 16, 16, 16, 16, 16, 16, 10, 10, 10, 10, 10, 10, 10, 10, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:35,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:35,370 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:35,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:35,370 INFO L82 PathProgramCache]: Analyzing trace with hash -865443995, now seen corresponding path program 6 times [2020-07-21 19:30:35,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:35,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1099055868] [2020-07-21 19:30:35,371 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:35,584 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:35,585 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:35,588 INFO L263 TraceCheckSpWp]: Trace formula consists of 784 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:30:35,594 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:35,763 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 819 refuted. 0 times theorem prover too weak. 2713 trivial. 0 not checked. [2020-07-21 19:30:35,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:37,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:37,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:38,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:38,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:38,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:38,943 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:39,177 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:39,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:39,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:39,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:39,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:39,609 INFO L134 CoverageAnalysis]: Checked inductivity of 3649 backedges. 117 proven. 849 refuted. 0 times theorem prover too weak. 2683 trivial. 0 not checked. [2020-07-21 19:30:39,610 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1099055868] [2020-07-21 19:30:39,610 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:39,611 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 19:30:39,611 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2035110670] [2020-07-21 19:30:39,612 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 19:30:39,612 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:39,612 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 19:30:39,612 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 19:30:39,613 INFO L87 Difference]: Start difference. First operand 60 states and 100 transitions. Second operand 22 states. [2020-07-21 19:30:40,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:40,075 INFO L93 Difference]: Finished difference Result 101 states and 232 transitions. [2020-07-21 19:30:40,075 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:30:40,076 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 351 [2020-07-21 19:30:40,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:40,079 INFO L225 Difference]: With dead ends: 101 [2020-07-21 19:30:40,079 INFO L226 Difference]: Without dead ends: 97 [2020-07-21 19:30:40,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 711 GetRequests, 667 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 19:30:40,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2020-07-21 19:30:40,089 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 65. [2020-07-21 19:30:40,090 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 19:30:40,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-21 19:30:40,091 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 351 [2020-07-21 19:30:40,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:40,092 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-21 19:30:40,092 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 19:30:40,093 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-21 19:30:40,095 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 338 [2020-07-21 19:30:40,095 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:40,096 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 22, 21, 21, 14, 14, 14, 14, 14, 14, 14, 14, 12, 10, 10, 10, 10, 10, 10, 10, 7, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:40,308 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:40,309 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:40,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:40,309 INFO L82 PathProgramCache]: Analyzing trace with hash 1413996641, now seen corresponding path program 3 times [2020-07-21 19:30:40,309 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:40,310 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1207790150] [2020-07-21 19:30:40,310 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:40,587 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:40,588 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:40,591 INFO L263 TraceCheckSpWp]: Trace formula consists of 750 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:30:40,597 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:40,790 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 762 refuted. 0 times theorem prover too weak. 2319 trivial. 0 not checked. [2020-07-21 19:30:40,791 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:42,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:42,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:43,419 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:43,875 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:44,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:44,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:44,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:44,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:44,473 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:44,595 INFO L134 CoverageAnalysis]: Checked inductivity of 3218 backedges. 137 proven. 795 refuted. 0 times theorem prover too weak. 2286 trivial. 0 not checked. [2020-07-21 19:30:44,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1207790150] [2020-07-21 19:30:44,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:44,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 22 [2020-07-21 19:30:44,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [867986364] [2020-07-21 19:30:44,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-21 19:30:44,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:44,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-21 19:30:44,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=380, Unknown=0, NotChecked=0, Total=462 [2020-07-21 19:30:44,599 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 22 states. [2020-07-21 19:30:45,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:45,065 INFO L93 Difference]: Finished difference Result 106 states and 254 transitions. [2020-07-21 19:30:45,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:30:45,066 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 337 [2020-07-21 19:30:45,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:45,069 INFO L225 Difference]: With dead ends: 106 [2020-07-21 19:30:45,069 INFO L226 Difference]: Without dead ends: 102 [2020-07-21 19:30:45,072 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 682 GetRequests, 638 SyntacticMatches, 16 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 190 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=170, Invalid=700, Unknown=0, NotChecked=0, Total=870 [2020-07-21 19:30:45,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-07-21 19:30:45,087 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 65. [2020-07-21 19:30:45,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-21 19:30:45,091 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 114 transitions. [2020-07-21 19:30:45,091 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 114 transitions. Word has length 337 [2020-07-21 19:30:45,093 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:45,093 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 114 transitions. [2020-07-21 19:30:45,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-21 19:30:45,093 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 114 transitions. [2020-07-21 19:30:45,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 820 [2020-07-21 19:30:45,102 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:45,103 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 52, 52, 47, 36, 36, 36, 36, 36, 36, 36, 36, 26, 26, 26, 26, 26, 26, 26, 26, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:45,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:45,317 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:45,317 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:45,318 INFO L82 PathProgramCache]: Analyzing trace with hash -1230346157, now seen corresponding path program 7 times [2020-07-21 19:30:45,319 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:45,319 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2116521473] [2020-07-21 19:30:45,319 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:45,718 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:45,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:45,722 INFO L263 TraceCheckSpWp]: Trace formula consists of 1828 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:30:45,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:46,342 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2371 refuted. 0 times theorem prover too weak. 17847 trivial. 0 not checked. [2020-07-21 19:30:46,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:50,088 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:51,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:51,989 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:51,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:52,569 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:52,570 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:52,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:52,868 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:53,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:53,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:53,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:53,273 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:53,610 INFO L134 CoverageAnalysis]: Checked inductivity of 20591 backedges. 373 proven. 2411 refuted. 0 times theorem prover too weak. 17807 trivial. 0 not checked. [2020-07-21 19:30:53,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2116521473] [2020-07-21 19:30:53,611 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:53,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 24 [2020-07-21 19:30:53,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278734536] [2020-07-21 19:30:53,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 19:30:53,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:53,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 19:30:53,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=96, Invalid=456, Unknown=0, NotChecked=0, Total=552 [2020-07-21 19:30:53,614 INFO L87 Difference]: Start difference. First operand 65 states and 114 transitions. Second operand 24 states. [2020-07-21 19:30:54,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:54,174 INFO L93 Difference]: Finished difference Result 111 states and 276 transitions. [2020-07-21 19:30:54,175 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:30:54,175 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 819 [2020-07-21 19:30:54,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:54,179 INFO L225 Difference]: With dead ends: 111 [2020-07-21 19:30:54,179 INFO L226 Difference]: Without dead ends: 107 [2020-07-21 19:30:54,181 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1648 GetRequests, 1599 SyntacticMatches, 18 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 245 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=205, Invalid=851, Unknown=0, NotChecked=0, Total=1056 [2020-07-21 19:30:54,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 107 states. [2020-07-21 19:30:54,191 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 107 to 70. [2020-07-21 19:30:54,192 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 19:30:54,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-21 19:30:54,193 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 819 [2020-07-21 19:30:54,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:54,195 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-21 19:30:54,195 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 19:30:54,195 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-21 19:30:54,198 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 419 [2020-07-21 19:30:54,198 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:54,198 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 27, 24, 24, 18, 18, 18, 18, 18, 18, 18, 18, 15, 12, 12, 12, 12, 12, 12, 12, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:54,411 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:54,412 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:54,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:54,413 INFO L82 PathProgramCache]: Analyzing trace with hash 2047786411, now seen corresponding path program 4 times [2020-07-21 19:30:54,413 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:54,414 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616149463] [2020-07-21 19:30:54,414 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:54,728 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:54,728 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:54,731 INFO L263 TraceCheckSpWp]: Trace formula consists of 930 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:30:54,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:54,931 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1118 refuted. 0 times theorem prover too weak. 3842 trivial. 0 not checked. [2020-07-21 19:30:54,931 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:57,576 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:58,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:58,470 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:59,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:59,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:59,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:00,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:00,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:00,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:00,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:00,174 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:00,291 INFO L134 CoverageAnalysis]: Checked inductivity of 5148 backedges. 188 proven. 1162 refuted. 0 times theorem prover too weak. 3798 trivial. 0 not checked. [2020-07-21 19:31:00,291 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616149463] [2020-07-21 19:31:00,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:00,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 19:31:00,292 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [544998080] [2020-07-21 19:31:00,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:31:00,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:00,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:31:00,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:31:00,294 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 23 states. [2020-07-21 19:31:00,822 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:00,823 INFO L93 Difference]: Finished difference Result 116 states and 300 transitions. [2020-07-21 19:31:00,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:31:00,824 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 418 [2020-07-21 19:31:00,825 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:00,828 INFO L225 Difference]: With dead ends: 116 [2020-07-21 19:31:00,828 INFO L226 Difference]: Without dead ends: 112 [2020-07-21 19:31:00,829 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 845 GetRequests, 796 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:31:00,829 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-07-21 19:31:00,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 70. [2020-07-21 19:31:00,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-07-21 19:31:00,841 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 129 transitions. [2020-07-21 19:31:00,841 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 129 transitions. Word has length 418 [2020-07-21 19:31:00,842 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:00,842 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 129 transitions. [2020-07-21 19:31:00,842 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:31:00,842 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 129 transitions. [2020-07-21 19:31:00,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 677 [2020-07-21 19:31:00,848 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:00,848 INFO L422 BasicCegarLoop]: trace histogram [62, 62, 42, 41, 41, 31, 31, 31, 31, 31, 31, 31, 31, 20, 20, 20, 20, 20, 20, 20, 20, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:01,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:01,063 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:01,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:01,063 INFO L82 PathProgramCache]: Analyzing trace with hash -1777656900, now seen corresponding path program 8 times [2020-07-21 19:31:01,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:01,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [611710218] [2020-07-21 19:31:01,064 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:01,491 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:01,492 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:01,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 1509 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:31:01,505 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:01,852 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2104 refuted. 0 times theorem prover too weak. 11666 trivial. 0 not checked. [2020-07-21 19:31:01,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:05,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:05,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:07,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:07,226 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:08,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:09,207 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:09,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:09,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:09,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:09,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:10,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:10,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:10,146 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:10,204 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:10,205 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:10,438 INFO L134 CoverageAnalysis]: Checked inductivity of 14119 backedges. 349 proven. 2156 refuted. 0 times theorem prover too weak. 11614 trivial. 0 not checked. [2020-07-21 19:31:10,439 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [611710218] [2020-07-21 19:31:10,439 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:10,440 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 19:31:10,440 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2077491611] [2020-07-21 19:31:10,441 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:31:10,441 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:10,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:31:10,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:31:10,442 INFO L87 Difference]: Start difference. First operand 70 states and 129 transitions. Second operand 25 states. [2020-07-21 19:31:11,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:11,063 INFO L93 Difference]: Finished difference Result 121 states and 324 transitions. [2020-07-21 19:31:11,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:31:11,064 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 676 [2020-07-21 19:31:11,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:11,068 INFO L225 Difference]: With dead ends: 121 [2020-07-21 19:31:11,068 INFO L226 Difference]: Without dead ends: 117 [2020-07-21 19:31:11,069 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1363 GetRequests, 1309 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 279 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:31:11,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2020-07-21 19:31:11,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 75. [2020-07-21 19:31:11,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-07-21 19:31:11,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 145 transitions. [2020-07-21 19:31:11,081 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 145 transitions. Word has length 676 [2020-07-21 19:31:11,082 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:11,082 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 145 transitions. [2020-07-21 19:31:11,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:31:11,082 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 145 transitions. [2020-07-21 19:31:11,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 755 [2020-07-21 19:31:11,089 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:11,090 INFO L422 BasicCegarLoop]: trace histogram [64, 64, 49, 47, 47, 32, 32, 32, 32, 32, 32, 32, 32, 26, 23, 23, 23, 23, 23, 23, 23, 15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:11,305 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:11,306 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:11,306 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:11,307 INFO L82 PathProgramCache]: Analyzing trace with hash -1813836186, now seen corresponding path program 4 times [2020-07-21 19:31:11,307 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:11,308 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1176072141] [2020-07-21 19:31:11,308 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:11,798 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:11,798 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:11,803 INFO L263 TraceCheckSpWp]: Trace formula consists of 1677 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:31:11,813 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:12,168 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2048 refuted. 0 times theorem prover too weak. 14594 trivial. 0 not checked. [2020-07-21 19:31:12,169 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:15,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:15,573 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:16,802 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:17,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:17,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,818 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:19,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:19,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:19,195 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:19,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:19,538 INFO L134 CoverageAnalysis]: Checked inductivity of 17056 backedges. 414 proven. 2088 refuted. 0 times theorem prover too weak. 14554 trivial. 0 not checked. [2020-07-21 19:31:19,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1176072141] [2020-07-21 19:31:19,539 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:19,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 19:31:19,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569049861] [2020-07-21 19:31:19,540 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:31:19,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:19,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:31:19,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:31:19,540 INFO L87 Difference]: Start difference. First operand 75 states and 145 transitions. Second operand 23 states. [2020-07-21 19:31:20,153 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:20,154 INFO L93 Difference]: Finished difference Result 159 states and 539 transitions. [2020-07-21 19:31:20,154 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:31:20,155 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 754 [2020-07-21 19:31:20,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:20,160 INFO L225 Difference]: With dead ends: 159 [2020-07-21 19:31:20,160 INFO L226 Difference]: Without dead ends: 155 [2020-07-21 19:31:20,161 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1517 GetRequests, 1468 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:31:20,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 155 states. [2020-07-21 19:31:20,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 155 to 77. [2020-07-21 19:31:20,181 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-07-21 19:31:20,182 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 152 transitions. [2020-07-21 19:31:20,182 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 152 transitions. Word has length 754 [2020-07-21 19:31:20,183 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:20,184 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 152 transitions. [2020-07-21 19:31:20,184 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:31:20,184 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 152 transitions. [2020-07-21 19:31:20,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 766 [2020-07-21 19:31:20,192 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:20,193 INFO L422 BasicCegarLoop]: trace histogram [66, 66, 47, 45, 45, 45, 33, 33, 33, 33, 33, 33, 33, 25, 22, 22, 22, 22, 22, 22, 22, 19, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:20,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:20,408 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:20,409 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:20,409 INFO L82 PathProgramCache]: Analyzing trace with hash 848822556, now seen corresponding path program 1 times [2020-07-21 19:31:20,410 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:20,410 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2126376979] [2020-07-21 19:31:20,411 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:20,921 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:20,921 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:20,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 1699 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:31:20,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:21,254 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1891 refuted. 0 times theorem prover too weak. 15332 trivial. 0 not checked. [2020-07-21 19:31:21,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:24,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:24,382 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:25,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:26,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:26,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:26,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:27,024 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:27,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:27,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:27,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:27,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:27,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:27,540 INFO L134 CoverageAnalysis]: Checked inductivity of 17647 backedges. 424 proven. 1924 refuted. 0 times theorem prover too weak. 15299 trivial. 0 not checked. [2020-07-21 19:31:27,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2126376979] [2020-07-21 19:31:27,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:27,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:31:27,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1918856114] [2020-07-21 19:31:27,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:31:27,541 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:27,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:31:27,542 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:31:27,542 INFO L87 Difference]: Start difference. First operand 77 states and 152 transitions. Second operand 21 states. [2020-07-21 19:31:28,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:28,047 INFO L93 Difference]: Finished difference Result 179 states and 673 transitions. [2020-07-21 19:31:28,048 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:31:28,049 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 765 [2020-07-21 19:31:28,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:28,053 INFO L225 Difference]: With dead ends: 179 [2020-07-21 19:31:28,053 INFO L226 Difference]: Without dead ends: 175 [2020-07-21 19:31:28,055 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1538 GetRequests, 1494 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:31:28,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2020-07-21 19:31:28,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 79. [2020-07-21 19:31:28,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-21 19:31:28,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 160 transitions. [2020-07-21 19:31:28,076 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 160 transitions. Word has length 765 [2020-07-21 19:31:28,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:28,077 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 160 transitions. [2020-07-21 19:31:28,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:31:28,077 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 160 transitions. [2020-07-21 19:31:28,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1080 [2020-07-21 19:31:28,088 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:28,089 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 77, 77, 61, 57, 41, 41, 41, 41, 41, 41, 41, 38, 38, 38, 38, 38, 38, 38, 25, 20, 19, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:28,301 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:28,302 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:28,302 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:28,303 INFO L82 PathProgramCache]: Analyzing trace with hash 67032718, now seen corresponding path program 1 times [2020-07-21 19:31:28,303 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:28,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [430480940] [2020-07-21 19:31:28,304 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:28,963 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:28,964 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:28,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 2399 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:31:28,979 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:29,703 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3056 refuted. 0 times theorem prover too weak. 30846 trivial. 0 not checked. [2020-07-21 19:31:29,703 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:33,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:36,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:36,163 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:37,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:37,495 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,830 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,831 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:39,398 INFO L134 CoverageAnalysis]: Checked inductivity of 34506 backedges. 604 proven. 3096 refuted. 0 times theorem prover too weak. 30806 trivial. 0 not checked. [2020-07-21 19:31:39,398 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [430480940] [2020-07-21 19:31:39,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:39,399 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 19:31:39,399 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [969355576] [2020-07-21 19:31:39,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:31:39,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:39,400 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:31:39,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:31:39,401 INFO L87 Difference]: Start difference. First operand 79 states and 160 transitions. Second operand 23 states. [2020-07-21 19:31:40,049 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:40,049 INFO L93 Difference]: Finished difference Result 156 states and 522 transitions. [2020-07-21 19:31:40,052 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:31:40,053 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1079 [2020-07-21 19:31:40,055 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:40,058 INFO L225 Difference]: With dead ends: 156 [2020-07-21 19:31:40,059 INFO L226 Difference]: Without dead ends: 152 [2020-07-21 19:31:40,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2166 GetRequests, 2117 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:31:40,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2020-07-21 19:31:40,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 82. [2020-07-21 19:31:40,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-07-21 19:31:40,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 170 transitions. [2020-07-21 19:31:40,078 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 170 transitions. Word has length 1079 [2020-07-21 19:31:40,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:40,079 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 170 transitions. [2020-07-21 19:31:40,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:31:40,079 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 170 transitions. [2020-07-21 19:31:40,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 981 [2020-07-21 19:31:40,090 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:40,090 INFO L422 BasicCegarLoop]: trace histogram [73, 73, 70, 70, 62, 53, 36, 36, 36, 36, 36, 36, 36, 35, 35, 35, 35, 35, 35, 35, 27, 17, 17, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:40,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:40,305 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:40,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:40,306 INFO L82 PathProgramCache]: Analyzing trace with hash -1973171480, now seen corresponding path program 2 times [2020-07-21 19:31:40,306 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:40,307 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2121182670] [2020-07-21 19:31:40,307 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:40,984 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:40,984 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:40,989 INFO L263 TraceCheckSpWp]: Trace formula consists of 2177 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:31:40,997 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:41,950 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2408 refuted. 0 times theorem prover too weak. 25350 trivial. 0 not checked. [2020-07-21 19:31:41,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:45,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:45,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:47,099 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:47,100 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:47,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:47,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:48,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:48,641 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:49,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:49,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:49,125 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:49,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:49,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:49,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:49,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:49,698 INFO L134 CoverageAnalysis]: Checked inductivity of 28341 backedges. 583 proven. 2441 refuted. 0 times theorem prover too weak. 25317 trivial. 0 not checked. [2020-07-21 19:31:49,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2121182670] [2020-07-21 19:31:49,699 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:49,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:31:49,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899253953] [2020-07-21 19:31:49,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:31:49,701 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:49,701 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:31:49,701 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:31:49,701 INFO L87 Difference]: Start difference. First operand 82 states and 170 transitions. Second operand 21 states. [2020-07-21 19:31:50,289 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:50,289 INFO L93 Difference]: Finished difference Result 174 states and 639 transitions. [2020-07-21 19:31:50,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:31:50,291 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 980 [2020-07-21 19:31:50,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:50,295 INFO L225 Difference]: With dead ends: 174 [2020-07-21 19:31:50,296 INFO L226 Difference]: Without dead ends: 170 [2020-07-21 19:31:50,297 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1967 GetRequests, 1923 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:31:50,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2020-07-21 19:31:50,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 89. [2020-07-21 19:31:50,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-07-21 19:31:50,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 197 transitions. [2020-07-21 19:31:50,319 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 197 transitions. Word has length 980 [2020-07-21 19:31:50,320 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:50,320 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 197 transitions. [2020-07-21 19:31:50,320 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:31:50,320 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 197 transitions. [2020-07-21 19:31:50,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-21 19:31:50,335 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:50,336 INFO L422 BasicCegarLoop]: trace histogram [88, 88, 79, 79, 65, 60, 44, 44, 44, 44, 44, 44, 44, 39, 39, 39, 39, 39, 39, 39, 28, 21, 21, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:50,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:50,551 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:50,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:50,552 INFO L82 PathProgramCache]: Analyzing trace with hash -191683652, now seen corresponding path program 3 times [2020-07-21 19:31:50,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:50,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [787002562] [2020-07-21 19:31:50,553 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:51,270 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:51,270 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:51,276 INFO L263 TraceCheckSpWp]: Trace formula consists of 2521 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:31:51,286 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:52,015 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 764 proven. 3594 refuted. 0 times theorem prover too weak. 33876 trivial. 0 not checked. [2020-07-21 19:31:52,015 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:57,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:59,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:01,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:02,882 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:03,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:03,354 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:03,707 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:03,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:03,881 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:03,994 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:03,995 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:04,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:04,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:04,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:04,750 INFO L134 CoverageAnalysis]: Checked inductivity of 38234 backedges. 770 proven. 3644 refuted. 0 times theorem prover too weak. 33820 trivial. 0 not checked. [2020-07-21 19:32:04,751 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [787002562] [2020-07-21 19:32:04,751 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:32:04,751 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 19:32:04,751 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355606370] [2020-07-21 19:32:04,752 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:32:04,753 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:32:04,753 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:32:04,753 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:32:04,753 INFO L87 Difference]: Start difference. First operand 89 states and 197 transitions. Second operand 25 states. [2020-07-21 19:32:05,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:32:05,913 INFO L93 Difference]: Finished difference Result 263 states and 1331 transitions. [2020-07-21 19:32:05,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:32:05,915 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1134 [2020-07-21 19:32:05,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:32:05,921 INFO L225 Difference]: With dead ends: 263 [2020-07-21 19:32:05,921 INFO L226 Difference]: Without dead ends: 142 [2020-07-21 19:32:05,927 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2277 GetRequests, 2223 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:32:05,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2020-07-21 19:32:05,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2020-07-21 19:32:05,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 142 states. [2020-07-21 19:32:05,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 326 transitions. [2020-07-21 19:32:05,958 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 326 transitions. Word has length 1134 [2020-07-21 19:32:05,958 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:32:05,959 INFO L479 AbstractCegarLoop]: Abstraction has 142 states and 326 transitions. [2020-07-21 19:32:05,959 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:32:05,959 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 326 transitions. [2020-07-21 19:32:05,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1001 [2020-07-21 19:32:05,977 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:32:05,978 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 63, 63, 58, 53, 42, 42, 42, 42, 42, 42, 42, 31, 31, 31, 31, 31, 31, 31, 31, 22, 16, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:32:06,190 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:06,190 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:32:06,191 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:32:06,192 INFO L82 PathProgramCache]: Analyzing trace with hash 873446842, now seen corresponding path program 4 times [2020-07-21 19:32:06,192 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:32:06,192 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [820434580] [2020-07-21 19:32:06,193 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:06,992 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:32:06,993 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:32:06,999 INFO L263 TraceCheckSpWp]: Trace formula consists of 2223 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:32:07,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:32:07,631 INFO L134 CoverageAnalysis]: Checked inductivity of 30091 backedges. 639 proven. 3181 refuted. 0 times theorem prover too weak. 26271 trivial. 0 not checked. [2020-07-21 19:32:07,632 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:32:13,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:13,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:15,491 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:15,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:16,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:17,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:17,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:18,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:18,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:18,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:18,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:18,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:18,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:18,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:19,058 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:19,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:19,156 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:19,640 INFO L134 CoverageAnalysis]: Checked inductivity of 30091 backedges. 643 proven. 3233 refuted. 0 times theorem prover too weak. 26215 trivial. 0 not checked. [2020-07-21 19:32:19,641 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [820434580] [2020-07-21 19:32:19,641 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:32:19,641 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 19:32:19,642 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744523375] [2020-07-21 19:32:19,643 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:32:19,643 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:32:19,643 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:32:19,643 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:32:19,643 INFO L87 Difference]: Start difference. First operand 142 states and 326 transitions. Second operand 25 states. [2020-07-21 19:32:20,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:32:20,897 INFO L93 Difference]: Finished difference Result 385 states and 1941 transitions. [2020-07-21 19:32:20,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:32:20,899 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1000 [2020-07-21 19:32:20,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:32:20,907 INFO L225 Difference]: With dead ends: 385 [2020-07-21 19:32:20,907 INFO L226 Difference]: Without dead ends: 198 [2020-07-21 19:32:20,923 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2009 GetRequests, 1955 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:32:20,923 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2020-07-21 19:32:20,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 147. [2020-07-21 19:32:20,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 147 states. [2020-07-21 19:32:20,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 346 transitions. [2020-07-21 19:32:20,953 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 346 transitions. Word has length 1000 [2020-07-21 19:32:20,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:32:20,954 INFO L479 AbstractCegarLoop]: Abstraction has 147 states and 346 transitions. [2020-07-21 19:32:20,954 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:32:20,955 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 346 transitions. [2020-07-21 19:32:20,979 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 982 [2020-07-21 19:32:20,979 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:32:20,980 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 70, 70, 53, 51, 37, 37, 37, 37, 37, 37, 37, 35, 35, 35, 35, 35, 35, 35, 22, 19, 18, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:32:21,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:21,197 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:32:21,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:32:21,198 INFO L82 PathProgramCache]: Analyzing trace with hash 401393431, now seen corresponding path program 5 times [2020-07-21 19:32:21,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:32:21,198 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [650053494] [2020-07-21 19:32:21,201 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:22,054 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:32:22,055 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:32:22,065 INFO L263 TraceCheckSpWp]: Trace formula consists of 2182 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:32:22,080 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:32:22,706 INFO L134 CoverageAnalysis]: Checked inductivity of 28457 backedges. 601 proven. 2717 refuted. 0 times theorem prover too weak. 25139 trivial. 0 not checked. [2020-07-21 19:32:22,707 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:32:27,926 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:29,499 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 19:32:29,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:29,856 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:31,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:32,387 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:32,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:32,819 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:33,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:33,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:33,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:33,366 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:33,859 INFO L134 CoverageAnalysis]: Checked inductivity of 28457 backedges. 603 proven. 2755 refuted. 0 times theorem prover too weak. 25099 trivial. 0 not checked. [2020-07-21 19:32:33,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [650053494] [2020-07-21 19:32:33,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:32:33,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 19:32:33,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1762035935] [2020-07-21 19:32:33,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:32:33,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:32:33,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:32:33,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:32:33,861 INFO L87 Difference]: Start difference. First operand 147 states and 346 transitions. Second operand 23 states. [2020-07-21 19:32:34,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:32:34,646 INFO L93 Difference]: Finished difference Result 263 states and 940 transitions. [2020-07-21 19:32:34,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:32:34,647 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 981 [2020-07-21 19:32:34,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:32:34,656 INFO L225 Difference]: With dead ends: 263 [2020-07-21 19:32:34,656 INFO L226 Difference]: Without dead ends: 249 [2020-07-21 19:32:34,660 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1970 GetRequests, 1921 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:32:34,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 249 states. [2020-07-21 19:32:34,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 249 to 150. [2020-07-21 19:32:34,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-21 19:32:34,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-21 19:32:34,697 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 981 [2020-07-21 19:32:34,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:32:34,698 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-21 19:32:34,698 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:32:34,698 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-21 19:32:34,711 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 935 [2020-07-21 19:32:34,711 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:32:34,712 INFO L422 BasicCegarLoop]: trace histogram [70, 70, 67, 67, 55, 50, 35, 35, 35, 35, 35, 35, 35, 33, 33, 33, 33, 33, 33, 33, 20, 20, 17, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:32:34,925 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:34,926 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:32:34,926 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:32:34,927 INFO L82 PathProgramCache]: Analyzing trace with hash 1939979877, now seen corresponding path program 6 times [2020-07-21 19:32:34,927 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:32:34,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2034968230] [2020-07-21 19:32:34,928 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:35,693 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:32:35,693 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:32:35,699 INFO L263 TraceCheckSpWp]: Trace formula consists of 2076 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:32:35,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:32:36,196 INFO L134 CoverageAnalysis]: Checked inductivity of 25706 backedges. 511 proven. 2289 refuted. 0 times theorem prover too weak. 22906 trivial. 0 not checked. [2020-07-21 19:32:36,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:32:41,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:42,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:42,699 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:44,030 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:44,855 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:45,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:45,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:45,462 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:45,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:45,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:45,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:45,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:46,339 INFO L134 CoverageAnalysis]: Checked inductivity of 25706 backedges. 511 proven. 2319 refuted. 0 times theorem prover too weak. 22876 trivial. 0 not checked. [2020-07-21 19:32:46,340 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2034968230] [2020-07-21 19:32:46,340 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:32:46,340 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:32:46,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1167311862] [2020-07-21 19:32:46,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:32:46,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:32:46,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:32:46,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:32:46,343 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-21 19:32:47,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:32:47,251 INFO L93 Difference]: Finished difference Result 299 states and 1198 transitions. [2020-07-21 19:32:47,253 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:32:47,254 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 934 [2020-07-21 19:32:47,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:32:47,263 INFO L225 Difference]: With dead ends: 299 [2020-07-21 19:32:47,263 INFO L226 Difference]: Without dead ends: 285 [2020-07-21 19:32:47,267 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1875 GetRequests, 1831 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:32:47,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2020-07-21 19:32:47,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 150. [2020-07-21 19:32:47,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 150 states. [2020-07-21 19:32:47,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 358 transitions. [2020-07-21 19:32:47,314 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 358 transitions. Word has length 934 [2020-07-21 19:32:47,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:32:47,315 INFO L479 AbstractCegarLoop]: Abstraction has 150 states and 358 transitions. [2020-07-21 19:32:47,315 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:32:47,315 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 358 transitions. [2020-07-21 19:32:47,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1121 [2020-07-21 19:32:47,335 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:32:47,336 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 77, 77, 69, 66, 43, 43, 43, 43, 43, 43, 43, 38, 38, 38, 38, 38, 38, 38, 28, 26, 20, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:32:47,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:47,550 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:32:47,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:32:47,552 INFO L82 PathProgramCache]: Analyzing trace with hash -1849137250, now seen corresponding path program 7 times [2020-07-21 19:32:47,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:32:47,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1107305927] [2020-07-21 19:32:47,553 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:48,562 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:32:48,562 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:32:48,572 INFO L263 TraceCheckSpWp]: Trace formula consists of 2487 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:32:48,587 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:32:49,604 INFO L134 CoverageAnalysis]: Checked inductivity of 37239 backedges. 585 proven. 2878 refuted. 0 times theorem prover too weak. 33776 trivial. 0 not checked. [2020-07-21 19:32:49,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:32:51,635 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 19:32:55,934 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:55,935 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:57,498 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:58,522 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:58,523 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:59,202 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:59,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:59,416 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:59,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:59,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:59,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:59,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:59,762 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:00,596 INFO L134 CoverageAnalysis]: Checked inductivity of 37239 backedges. 587 proven. 2909 refuted. 0 times theorem prover too weak. 33743 trivial. 0 not checked. [2020-07-21 19:33:00,597 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1107305927] [2020-07-21 19:33:00,597 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:33:00,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:33:00,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834216873] [2020-07-21 19:33:00,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:33:00,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:33:00,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:33:00,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:33:00,600 INFO L87 Difference]: Start difference. First operand 150 states and 358 transitions. Second operand 21 states. [2020-07-21 19:33:01,471 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:33:01,472 INFO L93 Difference]: Finished difference Result 251 states and 812 transitions. [2020-07-21 19:33:01,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:33:01,476 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1120 [2020-07-21 19:33:01,478 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:33:01,486 INFO L225 Difference]: With dead ends: 251 [2020-07-21 19:33:01,487 INFO L226 Difference]: Without dead ends: 237 [2020-07-21 19:33:01,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2247 GetRequests, 2203 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:33:01,492 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 237 states. [2020-07-21 19:33:01,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 237 to 170. [2020-07-21 19:33:01,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 170 states. [2020-07-21 19:33:01,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 170 states to 170 states and 456 transitions. [2020-07-21 19:33:01,540 INFO L78 Accepts]: Start accepts. Automaton has 170 states and 456 transitions. Word has length 1120 [2020-07-21 19:33:01,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:33:01,541 INFO L479 AbstractCegarLoop]: Abstraction has 170 states and 456 transitions. [2020-07-21 19:33:01,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:33:01,542 INFO L276 IsEmpty]: Start isEmpty. Operand 170 states and 456 transitions. [2020-07-21 19:33:01,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1319 [2020-07-21 19:33:01,570 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:33:01,572 INFO L422 BasicCegarLoop]: trace histogram [103, 103, 92, 92, 72, 69, 51, 51, 51, 51, 51, 51, 51, 46, 46, 46, 46, 46, 46, 46, 31, 26, 23, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:33:01,785 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:33:01,786 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:33:01,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:33:01,788 INFO L82 PathProgramCache]: Analyzing trace with hash 1147462940, now seen corresponding path program 8 times [2020-07-21 19:33:01,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:33:01,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1328122360] [2020-07-21 19:33:01,789 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:33:03,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:33:03,053 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:33:03,075 INFO L263 TraceCheckSpWp]: Trace formula consists of 2931 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:33:03,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:33:04,726 INFO L134 CoverageAnalysis]: Checked inductivity of 51898 backedges. 728 proven. 3822 refuted. 0 times theorem prover too weak. 47348 trivial. 0 not checked. [2020-07-21 19:33:04,726 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:33:12,979 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:15,316 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:15,317 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:16,102 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 19:33:17,293 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:18,060 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:18,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:18,676 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:18,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:18,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:19,070 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:20,520 INFO L134 CoverageAnalysis]: Checked inductivity of 51898 backedges. 730 proven. 3860 refuted. 0 times theorem prover too weak. 47308 trivial. 0 not checked. [2020-07-21 19:33:20,521 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1328122360] [2020-07-21 19:33:20,522 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:33:20,522 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 19:33:20,523 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607632005] [2020-07-21 19:33:20,524 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:33:20,524 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:33:20,524 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:33:20,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:33:20,525 INFO L87 Difference]: Start difference. First operand 170 states and 456 transitions. Second operand 23 states. [2020-07-21 19:33:21,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:33:21,249 INFO L93 Difference]: Finished difference Result 254 states and 839 transitions. [2020-07-21 19:33:21,251 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:33:21,251 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1318 [2020-07-21 19:33:21,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:33:21,257 INFO L225 Difference]: With dead ends: 254 [2020-07-21 19:33:21,257 INFO L226 Difference]: Without dead ends: 240 [2020-07-21 19:33:21,260 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2644 GetRequests, 2595 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:33:21,261 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 240 states. [2020-07-21 19:33:21,297 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 240 to 166. [2020-07-21 19:33:21,298 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 166 states. [2020-07-21 19:33:21,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 436 transitions. [2020-07-21 19:33:21,303 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 436 transitions. Word has length 1318 [2020-07-21 19:33:21,304 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:33:21,304 INFO L479 AbstractCegarLoop]: Abstraction has 166 states and 436 transitions. [2020-07-21 19:33:21,304 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:33:21,304 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 436 transitions. [2020-07-21 19:33:21,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1104 [2020-07-21 19:33:21,326 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:33:21,327 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 79, 79, 65, 65, 41, 41, 41, 41, 41, 41, 41, 39, 39, 39, 39, 39, 39, 39, 26, 24, 17, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:33:21,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:33:21,543 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:33:21,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:33:21,544 INFO L82 PathProgramCache]: Analyzing trace with hash -462615337, now seen corresponding path program 9 times [2020-07-21 19:33:21,545 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:33:21,545 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [400883252] [2020-07-21 19:33:21,545 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:33:22,565 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:33:22,566 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:33:22,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 2450 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:33:22,584 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:33:23,441 INFO L134 CoverageAnalysis]: Checked inductivity of 36012 backedges. 649 proven. 2690 refuted. 0 times theorem prover too weak. 32673 trivial. 0 not checked. [2020-07-21 19:33:23,442 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:33:29,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:31,361 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:31,362 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:32,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:33,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:33,682 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:33,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:34,160 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:34,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:34,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:34,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:35,261 INFO L134 CoverageAnalysis]: Checked inductivity of 36012 backedges. 649 proven. 2722 refuted. 0 times theorem prover too weak. 32641 trivial. 0 not checked. [2020-07-21 19:33:35,261 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [400883252] [2020-07-21 19:33:35,261 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:33:35,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:33:35,262 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [540184854] [2020-07-21 19:33:35,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:33:35,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:33:35,263 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:33:35,263 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:33:35,264 INFO L87 Difference]: Start difference. First operand 166 states and 436 transitions. Second operand 21 states. [2020-07-21 19:33:35,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:33:35,971 INFO L93 Difference]: Finished difference Result 269 states and 930 transitions. [2020-07-21 19:33:35,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:33:35,973 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1103 [2020-07-21 19:33:35,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:33:35,979 INFO L225 Difference]: With dead ends: 269 [2020-07-21 19:33:35,980 INFO L226 Difference]: Without dead ends: 255 [2020-07-21 19:33:35,982 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2213 GetRequests, 2169 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:33:35,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 255 states. [2020-07-21 19:33:36,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 255 to 160. [2020-07-21 19:33:36,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 160 states. [2020-07-21 19:33:36,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 409 transitions. [2020-07-21 19:33:36,019 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 409 transitions. Word has length 1103 [2020-07-21 19:33:36,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:33:36,020 INFO L479 AbstractCegarLoop]: Abstraction has 160 states and 409 transitions. [2020-07-21 19:33:36,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:33:36,020 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 409 transitions. [2020-07-21 19:33:36,043 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1443 [2020-07-21 19:33:36,043 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:33:36,044 INFO L422 BasicCegarLoop]: trace histogram [110, 110, 101, 101, 87, 82, 55, 55, 55, 55, 55, 55, 55, 50, 50, 50, 50, 50, 50, 50, 32, 32, 28, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:33:36,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:33:36,259 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:33:36,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:33:36,260 INFO L82 PathProgramCache]: Analyzing trace with hash 1255370812, now seen corresponding path program 10 times [2020-07-21 19:33:36,261 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:33:36,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [574591288] [2020-07-21 19:33:36,261 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:33:37,283 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:33:37,283 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:33:37,291 INFO L263 TraceCheckSpWp]: Trace formula consists of 3203 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:33:37,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:33:38,189 INFO L134 CoverageAnalysis]: Checked inductivity of 62082 backedges. 688 proven. 3232 refuted. 0 times theorem prover too weak. 58162 trivial. 0 not checked. [2020-07-21 19:33:38,189 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:33:47,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:47,182 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:49,815 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:51,097 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:51,098 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:51,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:51,887 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:51,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:51,982 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:52,073 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:52,239 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:33:53,292 INFO L134 CoverageAnalysis]: Checked inductivity of 62082 backedges. 688 proven. 3256 refuted. 0 times theorem prover too weak. 58138 trivial. 0 not checked. [2020-07-21 19:33:53,293 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [574591288] [2020-07-21 19:33:53,293 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:33:53,293 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:33:53,294 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1607377591] [2020-07-21 19:33:53,295 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:33:53,295 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:33:53,295 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:33:53,295 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:33:53,295 INFO L87 Difference]: Start difference. First operand 160 states and 409 transitions. Second operand 19 states. [2020-07-21 19:33:54,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:33:54,058 INFO L93 Difference]: Finished difference Result 324 states and 1425 transitions. [2020-07-21 19:33:54,061 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:33:54,061 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1442 [2020-07-21 19:33:54,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:33:54,071 INFO L225 Difference]: With dead ends: 324 [2020-07-21 19:33:54,072 INFO L226 Difference]: Without dead ends: 310 [2020-07-21 19:33:54,077 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2890 GetRequests, 2851 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:33:54,081 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2020-07-21 19:33:54,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 162. [2020-07-21 19:33:54,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 162 states. [2020-07-21 19:33:54,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 422 transitions. [2020-07-21 19:33:54,132 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 422 transitions. Word has length 1442 [2020-07-21 19:33:54,133 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:33:54,133 INFO L479 AbstractCegarLoop]: Abstraction has 162 states and 422 transitions. [2020-07-21 19:33:54,134 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:33:54,134 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 422 transitions. [2020-07-21 19:33:54,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1261 [2020-07-21 19:33:54,154 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:33:54,155 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 87, 87, 75, 68, 49, 49, 49, 49, 49, 49, 49, 43, 43, 43, 43, 43, 43, 43, 32, 23, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:33:54,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:33:54,370 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:33:54,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:33:54,371 INFO L82 PathProgramCache]: Analyzing trace with hash 1272627719, now seen corresponding path program 11 times [2020-07-21 19:33:54,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:33:54,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2120891831] [2020-07-21 19:33:54,372 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:33:55,354 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:33:55,354 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:33:55,362 INFO L263 TraceCheckSpWp]: Trace formula consists of 2800 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:33:55,372 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:33:56,156 INFO L134 CoverageAnalysis]: Checked inductivity of 47345 backedges. 778 proven. 3137 refuted. 0 times theorem prover too weak. 43430 trivial. 0 not checked. [2020-07-21 19:33:56,156 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:34:05,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:05,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:07,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:09,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:09,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:09,852 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:09,853 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:10,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:10,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:10,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:10,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:11,634 INFO L134 CoverageAnalysis]: Checked inductivity of 47345 backedges. 780 proven. 3168 refuted. 0 times theorem prover too weak. 43397 trivial. 0 not checked. [2020-07-21 19:34:11,634 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2120891831] [2020-07-21 19:34:11,634 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:34:11,635 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:34:11,635 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442722389] [2020-07-21 19:34:11,636 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:34:11,636 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:34:11,636 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:34:11,636 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:34:11,637 INFO L87 Difference]: Start difference. First operand 162 states and 422 transitions. Second operand 21 states. [2020-07-21 19:34:12,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:34:12,388 INFO L93 Difference]: Finished difference Result 263 states and 912 transitions. [2020-07-21 19:34:12,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:34:12,391 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1260 [2020-07-21 19:34:12,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:34:12,397 INFO L225 Difference]: With dead ends: 263 [2020-07-21 19:34:12,398 INFO L226 Difference]: Without dead ends: 246 [2020-07-21 19:34:12,400 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2527 GetRequests, 2483 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:34:12,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 246 states. [2020-07-21 19:34:12,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 246 to 182. [2020-07-21 19:34:12,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 182 states. [2020-07-21 19:34:12,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 527 transitions. [2020-07-21 19:34:12,435 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 527 transitions. Word has length 1260 [2020-07-21 19:34:12,436 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:34:12,436 INFO L479 AbstractCegarLoop]: Abstraction has 182 states and 527 transitions. [2020-07-21 19:34:12,436 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:34:12,436 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 527 transitions. [2020-07-21 19:34:12,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1239 [2020-07-21 19:34:12,457 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:34:12,457 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 90, 90, 69, 64, 46, 46, 46, 46, 46, 46, 46, 45, 45, 45, 45, 45, 45, 45, 26, 24, 24, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:34:12,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:34:12,672 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:34:12,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:34:12,673 INFO L82 PathProgramCache]: Analyzing trace with hash 1142328740, now seen corresponding path program 12 times [2020-07-21 19:34:12,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:34:12,674 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1505555525] [2020-07-21 19:34:12,674 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:34:13,698 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:34:13,698 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:34:13,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 2753 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:34:13,718 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:34:14,718 INFO L134 CoverageAnalysis]: Checked inductivity of 45594 backedges. 934 proven. 3836 refuted. 0 times theorem prover too weak. 40824 trivial. 0 not checked. [2020-07-21 19:34:14,719 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:34:22,976 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 19:34:25,066 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:34:25,173 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 19:34:25,276 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 19:34:25,385 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 19:34:26,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:26,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:30,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:33,645 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:33,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:35,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:35,196 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:35,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:35,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:36,380 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:36,381 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:36,717 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:36,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:36,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:37,031 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:37,032 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:37,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:38,671 INFO L134 CoverageAnalysis]: Checked inductivity of 45594 backedges. 938 proven. 3888 refuted. 0 times theorem prover too weak. 40768 trivial. 0 not checked. [2020-07-21 19:34:38,672 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1505555525] [2020-07-21 19:34:38,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:34:38,673 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 19:34:38,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1604003214] [2020-07-21 19:34:38,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:34:38,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:34:38,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:34:38,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:34:38,676 INFO L87 Difference]: Start difference. First operand 182 states and 527 transitions. Second operand 25 states. [2020-07-21 19:34:40,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:34:40,098 INFO L93 Difference]: Finished difference Result 283 states and 1044 transitions. [2020-07-21 19:34:40,100 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:34:40,101 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1238 [2020-07-21 19:34:40,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:34:40,109 INFO L225 Difference]: With dead ends: 283 [2020-07-21 19:34:40,109 INFO L226 Difference]: Without dead ends: 217 [2020-07-21 19:34:40,114 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2485 GetRequests, 2431 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:34:40,115 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 217 states. [2020-07-21 19:34:40,148 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 217 to 195. [2020-07-21 19:34:40,149 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 195 states. [2020-07-21 19:34:40,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 582 transitions. [2020-07-21 19:34:40,156 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 582 transitions. Word has length 1238 [2020-07-21 19:34:40,156 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:34:40,157 INFO L479 AbstractCegarLoop]: Abstraction has 195 states and 582 transitions. [2020-07-21 19:34:40,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:34:40,157 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 582 transitions. [2020-07-21 19:34:40,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1331 [2020-07-21 19:34:40,193 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:34:40,194 INFO L422 BasicCegarLoop]: trace histogram [101, 101, 96, 96, 74, 67, 50, 50, 50, 50, 50, 50, 50, 48, 48, 48, 48, 48, 48, 48, 34, 24, 22, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:34:40,409 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:34:40,410 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:34:40,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:34:40,411 INFO L82 PathProgramCache]: Analyzing trace with hash -79251345, now seen corresponding path program 13 times [2020-07-21 19:34:40,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:34:40,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836844602] [2020-07-21 19:34:40,412 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:34:41,718 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:34:41,718 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:34:41,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 2958 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:34:41,749 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:34:43,167 INFO L134 CoverageAnalysis]: Checked inductivity of 52764 backedges. 809 proven. 3243 refuted. 0 times theorem prover too weak. 48712 trivial. 0 not checked. [2020-07-21 19:34:43,168 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:34:51,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:54,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:54,953 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:57,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:58,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:58,710 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:59,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:59,064 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:59,268 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:59,269 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:59,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:59,397 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:59,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:59,720 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:01,304 INFO L134 CoverageAnalysis]: Checked inductivity of 52764 backedges. 811 proven. 3271 refuted. 0 times theorem prover too weak. 48682 trivial. 0 not checked. [2020-07-21 19:35:01,305 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [836844602] [2020-07-21 19:35:01,305 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:35:01,306 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:35:01,306 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502121959] [2020-07-21 19:35:01,307 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:35:01,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:35:01,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:35:01,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:35:01,308 INFO L87 Difference]: Start difference. First operand 195 states and 582 transitions. Second operand 21 states. [2020-07-21 19:35:02,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:35:02,185 INFO L93 Difference]: Finished difference Result 297 states and 1087 transitions. [2020-07-21 19:35:02,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:35:02,188 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1330 [2020-07-21 19:35:02,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:35:02,195 INFO L225 Difference]: With dead ends: 297 [2020-07-21 19:35:02,195 INFO L226 Difference]: Without dead ends: 283 [2020-07-21 19:35:02,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2667 GetRequests, 2623 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:35:02,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 283 states. [2020-07-21 19:35:02,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 283 to 196. [2020-07-21 19:35:02,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 196 states. [2020-07-21 19:35:02,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 582 transitions. [2020-07-21 19:35:02,242 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 582 transitions. Word has length 1330 [2020-07-21 19:35:02,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:35:02,243 INFO L479 AbstractCegarLoop]: Abstraction has 196 states and 582 transitions. [2020-07-21 19:35:02,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:35:02,243 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 582 transitions. [2020-07-21 19:35:02,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1158 [2020-07-21 19:35:02,266 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:35:02,267 INFO L422 BasicCegarLoop]: trace histogram [93, 93, 78, 78, 64, 60, 46, 46, 46, 46, 46, 46, 46, 39, 39, 39, 39, 39, 39, 39, 33, 21, 18, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:35:02,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:35:02,482 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:35:02,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:35:02,484 INFO L82 PathProgramCache]: Analyzing trace with hash -1896944006, now seen corresponding path program 14 times [2020-07-21 19:35:02,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:35:02,484 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1292167465] [2020-07-21 19:35:02,485 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:35:03,719 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:35:03,720 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:35:03,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 2573 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:35:03,748 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:35:05,043 INFO L134 CoverageAnalysis]: Checked inductivity of 40014 backedges. 1101 proven. 3324 refuted. 0 times theorem prover too weak. 35589 trivial. 0 not checked. [2020-07-21 19:35:05,044 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:35:08,596 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:35:08,704 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:35:15,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:19,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:21,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:22,693 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:23,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:24,154 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:24,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:24,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:24,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:24,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:24,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:25,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:26,833 INFO L134 CoverageAnalysis]: Checked inductivity of 40014 backedges. 1103 proven. 3378 refuted. 0 times theorem prover too weak. 35533 trivial. 0 not checked. [2020-07-21 19:35:26,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1292167465] [2020-07-21 19:35:26,834 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:35:26,834 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 19:35:26,834 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [315394078] [2020-07-21 19:35:26,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:35:26,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:35:26,835 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:35:26,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:35:26,836 INFO L87 Difference]: Start difference. First operand 196 states and 582 transitions. Second operand 25 states. [2020-07-21 19:35:28,312 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:35:28,313 INFO L93 Difference]: Finished difference Result 267 states and 873 transitions. [2020-07-21 19:35:28,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:35:28,316 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1157 [2020-07-21 19:35:28,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:35:28,321 INFO L225 Difference]: With dead ends: 267 [2020-07-21 19:35:28,321 INFO L226 Difference]: Without dead ends: 221 [2020-07-21 19:35:28,324 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2323 GetRequests, 2269 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:35:28,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 221 states. [2020-07-21 19:35:28,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 221 to 215. [2020-07-21 19:35:28,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 215 states. [2020-07-21 19:35:28,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 622 transitions. [2020-07-21 19:35:28,354 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 622 transitions. Word has length 1157 [2020-07-21 19:35:28,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:35:28,355 INFO L479 AbstractCegarLoop]: Abstraction has 215 states and 622 transitions. [2020-07-21 19:35:28,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:35:28,355 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 622 transitions. [2020-07-21 19:35:28,372 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1283 [2020-07-21 19:35:28,373 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:35:28,373 INFO L422 BasicCegarLoop]: trace histogram [101, 101, 88, 88, 74, 67, 50, 50, 50, 50, 50, 50, 50, 44, 44, 44, 44, 44, 44, 44, 34, 24, 23, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:35:28,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:35:28,588 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:35:28,588 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:35:28,589 INFO L82 PathProgramCache]: Analyzing trace with hash -1135413031, now seen corresponding path program 15 times [2020-07-21 19:35:28,589 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:35:28,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1480351669] [2020-07-21 19:35:28,590 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:35:29,729 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:35:29,729 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:35:29,737 INFO L263 TraceCheckSpWp]: Trace formula consists of 2850 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:35:29,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:35:30,554 INFO L134 CoverageAnalysis]: Checked inductivity of 49108 backedges. 859 proven. 3623 refuted. 0 times theorem prover too weak. 44626 trivial. 0 not checked. [2020-07-21 19:35:30,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:35:42,368 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:42,369 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:46,857 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:49,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:51,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:51,612 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:51,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:51,975 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:52,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:52,217 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:52,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:52,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:52,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:52,742 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:35:53,707 INFO L134 CoverageAnalysis]: Checked inductivity of 49108 backedges. 867 proven. 3659 refuted. 0 times theorem prover too weak. 44582 trivial. 0 not checked. [2020-07-21 19:35:53,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1480351669] [2020-07-21 19:35:53,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:35:53,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 19:35:53,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [215224274] [2020-07-21 19:35:53,710 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:35:53,710 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:35:53,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:35:53,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:35:53,710 INFO L87 Difference]: Start difference. First operand 215 states and 622 transitions. Second operand 23 states. [2020-07-21 19:35:55,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:35:55,033 INFO L93 Difference]: Finished difference Result 356 states and 1333 transitions. [2020-07-21 19:35:55,036 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:35:55,036 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1282 [2020-07-21 19:35:55,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:35:55,043 INFO L225 Difference]: With dead ends: 356 [2020-07-21 19:35:55,043 INFO L226 Difference]: Without dead ends: 284 [2020-07-21 19:35:55,047 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2572 GetRequests, 2523 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:35:55,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2020-07-21 19:35:55,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 244. [2020-07-21 19:35:55,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 244 states. [2020-07-21 19:35:55,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 244 states to 244 states and 738 transitions. [2020-07-21 19:35:55,096 INFO L78 Accepts]: Start accepts. Automaton has 244 states and 738 transitions. Word has length 1282 [2020-07-21 19:35:55,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:35:55,096 INFO L479 AbstractCegarLoop]: Abstraction has 244 states and 738 transitions. [2020-07-21 19:35:55,097 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:35:55,097 INFO L276 IsEmpty]: Start isEmpty. Operand 244 states and 738 transitions. [2020-07-21 19:35:55,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1314 [2020-07-21 19:35:55,121 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:35:55,122 INFO L422 BasicCegarLoop]: trace histogram [101, 101, 92, 92, 76, 72, 50, 50, 50, 50, 50, 50, 50, 46, 46, 46, 46, 46, 46, 46, 29, 26, 26, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:35:55,335 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:35:55,336 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:35:55,336 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:35:55,337 INFO L82 PathProgramCache]: Analyzing trace with hash -1975392489, now seen corresponding path program 16 times [2020-07-21 19:35:55,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:35:55,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [572031805] [2020-07-21 19:35:55,338 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:35:56,673 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:35:56,673 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:35:56,680 INFO L263 TraceCheckSpWp]: Trace formula consists of 2918 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:35:56,691 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:35:57,505 INFO L134 CoverageAnalysis]: Checked inductivity of 51390 backedges. 936 proven. 3596 refuted. 0 times theorem prover too weak. 46858 trivial. 0 not checked. [2020-07-21 19:35:57,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:36:10,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:15,123 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:15,124 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:18,886 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:19,799 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:20,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:20,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:21,192 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:21,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:21,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:21,796 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:23,456 INFO L134 CoverageAnalysis]: Checked inductivity of 51390 backedges. 940 proven. 3632 refuted. 0 times theorem prover too weak. 46818 trivial. 0 not checked. [2020-07-21 19:36:23,457 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [572031805] [2020-07-21 19:36:23,457 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:36:23,457 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 19:36:23,458 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [648245997] [2020-07-21 19:36:23,459 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:36:23,459 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:36:23,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:36:23,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:36:23,466 INFO L87 Difference]: Start difference. First operand 244 states and 738 transitions. Second operand 23 states. [2020-07-21 19:36:24,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:36:24,718 INFO L93 Difference]: Finished difference Result 332 states and 1206 transitions. [2020-07-21 19:36:24,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:36:24,723 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1313 [2020-07-21 19:36:24,724 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:36:24,730 INFO L225 Difference]: With dead ends: 332 [2020-07-21 19:36:24,730 INFO L226 Difference]: Without dead ends: 315 [2020-07-21 19:36:24,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2634 GetRequests, 2585 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:36:24,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 315 states. [2020-07-21 19:36:24,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 315 to 248. [2020-07-21 19:36:24,770 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-21 19:36:24,775 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 722 transitions. [2020-07-21 19:36:24,775 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 722 transitions. Word has length 1313 [2020-07-21 19:36:24,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:36:24,777 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 722 transitions. [2020-07-21 19:36:24,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:36:24,777 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 722 transitions. [2020-07-21 19:36:24,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1139 [2020-07-21 19:36:24,797 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:36:24,798 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 83, 83, 65, 64, 42, 42, 42, 42, 42, 42, 42, 41, 41, 41, 41, 41, 41, 41, 24, 22, 19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:36:25,011 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:36:25,012 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:36:25,012 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:36:25,013 INFO L82 PathProgramCache]: Analyzing trace with hash -222367850, now seen corresponding path program 17 times [2020-07-21 19:36:25,014 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:36:25,014 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [151978611] [2020-07-21 19:36:25,014 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:36:26,147 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:36:26,148 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:36:26,154 INFO L263 TraceCheckSpWp]: Trace formula consists of 2529 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:36:26,162 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:36:26,902 INFO L134 CoverageAnalysis]: Checked inductivity of 38376 backedges. 776 proven. 2673 refuted. 0 times theorem prover too weak. 34927 trivial. 0 not checked. [2020-07-21 19:36:26,902 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:36:40,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:44,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:44,162 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:45,916 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:46,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:46,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:47,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:47,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:47,918 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:48,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:48,488 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:50,223 INFO L134 CoverageAnalysis]: Checked inductivity of 38376 backedges. 778 proven. 2701 refuted. 0 times theorem prover too weak. 34897 trivial. 0 not checked. [2020-07-21 19:36:50,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [151978611] [2020-07-21 19:36:50,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:36:50,224 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:36:50,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715378210] [2020-07-21 19:36:50,225 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:36:50,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:36:50,226 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:36:50,226 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:36:50,226 INFO L87 Difference]: Start difference. First operand 248 states and 722 transitions. Second operand 21 states. [2020-07-21 19:36:51,489 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:36:51,489 INFO L93 Difference]: Finished difference Result 400 states and 1594 transitions. [2020-07-21 19:36:51,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:36:51,494 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1138 [2020-07-21 19:36:51,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:36:51,503 INFO L225 Difference]: With dead ends: 400 [2020-07-21 19:36:51,504 INFO L226 Difference]: Without dead ends: 383 [2020-07-21 19:36:51,508 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2283 GetRequests, 2239 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:36:51,509 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2020-07-21 19:36:51,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 238. [2020-07-21 19:36:51,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 238 states. [2020-07-21 19:36:51,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 238 states to 238 states and 653 transitions. [2020-07-21 19:36:51,562 INFO L78 Accepts]: Start accepts. Automaton has 238 states and 653 transitions. Word has length 1138 [2020-07-21 19:36:51,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:36:51,563 INFO L479 AbstractCegarLoop]: Abstraction has 238 states and 653 transitions. [2020-07-21 19:36:51,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:36:51,563 INFO L276 IsEmpty]: Start isEmpty. Operand 238 states and 653 transitions. [2020-07-21 19:36:51,587 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1290 [2020-07-21 19:36:51,587 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:36:51,588 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 91, 91, 74, 74, 49, 49, 49, 49, 49, 49, 49, 45, 45, 45, 45, 45, 45, 45, 29, 25, 24, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:36:51,801 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:36:51,802 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:36:51,802 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:36:51,802 INFO L82 PathProgramCache]: Analyzing trace with hash 637463279, now seen corresponding path program 18 times [2020-07-21 19:36:51,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:36:51,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1928293826] [2020-07-21 19:36:51,803 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:36:53,047 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:36:53,048 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:36:53,056 INFO L263 TraceCheckSpWp]: Trace formula consists of 2864 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:36:53,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:36:53,992 INFO L134 CoverageAnalysis]: Checked inductivity of 49458 backedges. 780 proven. 2702 refuted. 0 times theorem prover too weak. 45976 trivial. 0 not checked. [2020-07-21 19:36:53,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:02,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:02,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:05,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:05,610 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:07,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:07,065 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:07,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:07,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:07,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:07,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:08,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:09,595 INFO L134 CoverageAnalysis]: Checked inductivity of 49458 backedges. 780 proven. 2728 refuted. 0 times theorem prover too weak. 45950 trivial. 0 not checked. [2020-07-21 19:37:09,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1928293826] [2020-07-21 19:37:09,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:09,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:37:09,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1517611630] [2020-07-21 19:37:09,598 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:37:09,598 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:09,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:37:09,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:37:09,599 INFO L87 Difference]: Start difference. First operand 238 states and 653 transitions. Second operand 19 states. [2020-07-21 19:37:10,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:10,329 INFO L93 Difference]: Finished difference Result 489 states and 2374 transitions. [2020-07-21 19:37:10,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:37:10,332 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1289 [2020-07-21 19:37:10,334 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:10,345 INFO L225 Difference]: With dead ends: 489 [2020-07-21 19:37:10,345 INFO L226 Difference]: Without dead ends: 472 [2020-07-21 19:37:10,352 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2584 GetRequests, 2545 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:37:10,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 472 states. [2020-07-21 19:37:10,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 472 to 240. [2020-07-21 19:37:10,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 240 states. [2020-07-21 19:37:10,416 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 240 states to 240 states and 667 transitions. [2020-07-21 19:37:10,416 INFO L78 Accepts]: Start accepts. Automaton has 240 states and 667 transitions. Word has length 1289 [2020-07-21 19:37:10,417 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:10,417 INFO L479 AbstractCegarLoop]: Abstraction has 240 states and 667 transitions. [2020-07-21 19:37:10,417 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:37:10,417 INFO L276 IsEmpty]: Start isEmpty. Operand 240 states and 667 transitions. [2020-07-21 19:37:10,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1276 [2020-07-21 19:37:10,431 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:10,432 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 92, 92, 74, 72, 47, 47, 47, 47, 47, 47, 47, 46, 46, 46, 46, 46, 46, 46, 27, 26, 23, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:10,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:10,633 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:10,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:10,634 INFO L82 PathProgramCache]: Analyzing trace with hash 299289516, now seen corresponding path program 19 times [2020-07-21 19:37:10,634 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:10,635 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [981356308] [2020-07-21 19:37:10,635 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:11,958 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:37:11,958 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:11,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 2833 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:37:11,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:12,865 INFO L134 CoverageAnalysis]: Checked inductivity of 48325 backedges. 938 proven. 2944 refuted. 0 times theorem prover too weak. 44443 trivial. 0 not checked. [2020-07-21 19:37:12,866 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:20,325 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:25,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:27,790 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:28,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:28,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:28,703 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:28,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:29,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:29,020 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:29,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:29,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:30,795 INFO L134 CoverageAnalysis]: Checked inductivity of 48325 backedges. 938 proven. 2976 refuted. 0 times theorem prover too weak. 44411 trivial. 0 not checked. [2020-07-21 19:37:30,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [981356308] [2020-07-21 19:37:30,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:30,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:37:30,796 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [76658666] [2020-07-21 19:37:30,797 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:37:30,797 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:30,797 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:37:30,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:37:30,798 INFO L87 Difference]: Start difference. First operand 240 states and 667 transitions. Second operand 21 states. [2020-07-21 19:37:31,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:31,656 INFO L93 Difference]: Finished difference Result 357 states and 1259 transitions. [2020-07-21 19:37:31,658 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:37:31,658 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1275 [2020-07-21 19:37:31,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:31,668 INFO L225 Difference]: With dead ends: 357 [2020-07-21 19:37:31,668 INFO L226 Difference]: Without dead ends: 340 [2020-07-21 19:37:31,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2557 GetRequests, 2513 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:37:31,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2020-07-21 19:37:31,710 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 226. [2020-07-21 19:37:31,710 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2020-07-21 19:37:31,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 608 transitions. [2020-07-21 19:37:31,715 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 608 transitions. Word has length 1275 [2020-07-21 19:37:31,715 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:31,716 INFO L479 AbstractCegarLoop]: Abstraction has 226 states and 608 transitions. [2020-07-21 19:37:31,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:37:31,716 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 608 transitions. [2020-07-21 19:37:31,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1223 [2020-07-21 19:37:31,737 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:31,738 INFO L422 BasicCegarLoop]: trace histogram [91, 91, 88, 88, 72, 69, 45, 45, 45, 45, 45, 45, 45, 44, 44, 44, 44, 44, 44, 44, 27, 25, 22, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:31,951 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:31,952 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:31,952 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:31,953 INFO L82 PathProgramCache]: Analyzing trace with hash -337302208, now seen corresponding path program 20 times [2020-07-21 19:37:31,953 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:31,953 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [853417300] [2020-07-21 19:37:31,953 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:33,404 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:37:33,404 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:33,412 INFO L263 TraceCheckSpWp]: Trace formula consists of 2715 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:37:33,422 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:34,284 INFO L134 CoverageAnalysis]: Checked inductivity of 44338 backedges. 1101 proven. 3151 refuted. 0 times theorem prover too weak. 40086 trivial. 0 not checked. [2020-07-21 19:37:34,284 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:44,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:48,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:48,788 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:53,548 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:53,549 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:54,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:54,862 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:56,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:56,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:56,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:56,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:57,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:57,231 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:57,441 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:58,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:59,904 INFO L134 CoverageAnalysis]: Checked inductivity of 44338 backedges. 1105 proven. 3193 refuted. 0 times theorem prover too weak. 40040 trivial. 0 not checked. [2020-07-21 19:37:59,905 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [853417300] [2020-07-21 19:37:59,905 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:59,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 19:37:59,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1304941491] [2020-07-21 19:37:59,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:37:59,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:59,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:37:59,907 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:37:59,907 INFO L87 Difference]: Start difference. First operand 226 states and 608 transitions. Second operand 23 states. [2020-07-21 19:38:01,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:38:01,904 INFO L93 Difference]: Finished difference Result 366 states and 1284 transitions. [2020-07-21 19:38:01,910 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:38:01,911 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1222 [2020-07-21 19:38:01,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:38:01,920 INFO L225 Difference]: With dead ends: 366 [2020-07-21 19:38:01,921 INFO L226 Difference]: Without dead ends: 323 [2020-07-21 19:38:01,924 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2452 GetRequests, 2403 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:38:01,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 323 states. [2020-07-21 19:38:01,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 323 to 222. [2020-07-21 19:38:01,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 222 states. [2020-07-21 19:38:01,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 594 transitions. [2020-07-21 19:38:01,963 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 594 transitions. Word has length 1222 [2020-07-21 19:38:01,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:38:01,963 INFO L479 AbstractCegarLoop]: Abstraction has 222 states and 594 transitions. [2020-07-21 19:38:01,963 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:38:01,963 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 594 transitions. [2020-07-21 19:38:01,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 926 [2020-07-21 19:38:01,974 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:38:01,974 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 67, 67, 56, 52, 34, 34, 34, 34, 34, 34, 34, 33, 33, 33, 33, 33, 33, 33, 23, 18, 15, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:38:02,174 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:02,175 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:38:02,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:38:02,176 INFO L82 PathProgramCache]: Analyzing trace with hash 1548920416, now seen corresponding path program 21 times [2020-07-21 19:38:02,177 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:38:02,177 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [26396548] [2020-07-21 19:38:02,177 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:03,471 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:38:03,471 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:38:03,477 INFO L263 TraceCheckSpWp]: Trace formula consists of 2055 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:38:03,484 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:38:04,055 INFO L134 CoverageAnalysis]: Checked inductivity of 25178 backedges. 978 proven. 2175 refuted. 0 times theorem prover too weak. 22025 trivial. 0 not checked. [2020-07-21 19:38:04,055 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:38:07,644 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 19:38:14,376 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 19:38:14,486 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 19:38:14,593 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 19:38:15,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:15,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:19,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:19,827 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:23,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:23,440 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:24,792 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:24,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:25,637 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:25,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:26,274 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:26,623 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:26,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:27,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:28,564 WARN L193 SmtUtils]: Spent 927.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 19:38:28,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:30,580 INFO L134 CoverageAnalysis]: Checked inductivity of 25178 backedges. 984 proven. 2213 refuted. 0 times theorem prover too weak. 21981 trivial. 0 not checked. [2020-07-21 19:38:30,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [26396548] [2020-07-21 19:38:30,581 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:38:30,581 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 19:38:30,581 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [716198608] [2020-07-21 19:38:30,582 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:38:30,582 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:38:30,582 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:38:30,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:38:30,583 INFO L87 Difference]: Start difference. First operand 222 states and 594 transitions. Second operand 23 states. [2020-07-21 19:38:32,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:38:32,444 INFO L93 Difference]: Finished difference Result 311 states and 940 transitions. [2020-07-21 19:38:32,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:38:32,448 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 925 [2020-07-21 19:38:32,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:38:32,454 INFO L225 Difference]: With dead ends: 311 [2020-07-21 19:38:32,454 INFO L226 Difference]: Without dead ends: 268 [2020-07-21 19:38:32,456 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1858 GetRequests, 1809 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:38:32,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2020-07-21 19:38:32,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 232. [2020-07-21 19:38:32,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 232 states. [2020-07-21 19:38:32,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 668 transitions. [2020-07-21 19:38:32,482 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 668 transitions. Word has length 925 [2020-07-21 19:38:32,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:38:32,482 INFO L479 AbstractCegarLoop]: Abstraction has 232 states and 668 transitions. [2020-07-21 19:38:32,482 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:38:32,483 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 668 transitions. [2020-07-21 19:38:32,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1110 [2020-07-21 19:38:32,496 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:38:32,496 INFO L422 BasicCegarLoop]: trace histogram [82, 82, 81, 81, 65, 59, 41, 41, 41, 41, 41, 41, 41, 40, 40, 40, 40, 40, 40, 40, 25, 22, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:38:32,697 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:32,697 INFO L427 AbstractCegarLoop]: === Iteration 43 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:38:32,698 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:38:32,698 INFO L82 PathProgramCache]: Analyzing trace with hash 123171678, now seen corresponding path program 22 times [2020-07-21 19:38:32,699 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:38:32,699 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437248355] [2020-07-21 19:38:32,699 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:38:34,006 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:38:34,007 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:38:34,014 INFO L263 TraceCheckSpWp]: Trace formula consists of 2465 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:38:34,024 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:38:34,857 INFO L134 CoverageAnalysis]: Checked inductivity of 36435 backedges. 846 proven. 2507 refuted. 0 times theorem prover too weak. 33082 trivial. 0 not checked. [2020-07-21 19:38:34,858 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:38:38,106 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 19:38:38,210 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 19:38:39,673 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:38:39,782 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:38:39,900 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 19:38:40,018 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 19:38:40,130 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 57 [2020-07-21 19:38:40,235 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 19:38:51,251 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 19:38:51,360 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 19:38:51,469 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 19:38:51,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:56,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:00,962 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:00,963 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:01,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:01,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:02,604 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:02,605 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:03,008 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:03,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:03,236 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:03,237 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:03,546 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:04,398 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:06,176 INFO L134 CoverageAnalysis]: Checked inductivity of 36435 backedges. 850 proven. 2533 refuted. 0 times theorem prover too weak. 33052 trivial. 0 not checked. [2020-07-21 19:39:06,176 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437248355] [2020-07-21 19:39:06,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:39:06,177 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:39:06,177 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483323367] [2020-07-21 19:39:06,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:39:06,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:39:06,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:39:06,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:39:06,180 INFO L87 Difference]: Start difference. First operand 232 states and 668 transitions. Second operand 21 states. [2020-07-21 19:39:07,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:39:07,300 INFO L93 Difference]: Finished difference Result 324 states and 1055 transitions. [2020-07-21 19:39:07,305 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:39:07,305 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1109 [2020-07-21 19:39:07,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:39:07,311 INFO L225 Difference]: With dead ends: 324 [2020-07-21 19:39:07,311 INFO L226 Difference]: Without dead ends: 301 [2020-07-21 19:39:07,314 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2225 GetRequests, 2181 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:39:07,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2020-07-21 19:39:07,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 235. [2020-07-21 19:39:07,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 235 states. [2020-07-21 19:39:07,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 235 states to 235 states and 647 transitions. [2020-07-21 19:39:07,349 INFO L78 Accepts]: Start accepts. Automaton has 235 states and 647 transitions. Word has length 1109 [2020-07-21 19:39:07,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:39:07,350 INFO L479 AbstractCegarLoop]: Abstraction has 235 states and 647 transitions. [2020-07-21 19:39:07,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:39:07,351 INFO L276 IsEmpty]: Start isEmpty. Operand 235 states and 647 transitions. [2020-07-21 19:39:07,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1168 [2020-07-21 19:39:07,367 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:39:07,368 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 85, 85, 69, 65, 43, 43, 43, 43, 43, 43, 43, 42, 42, 42, 42, 42, 42, 42, 27, 22, 20, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:39:07,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:39:07,569 INFO L427 AbstractCegarLoop]: === Iteration 44 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:39:07,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:39:07,570 INFO L82 PathProgramCache]: Analyzing trace with hash 1360681526, now seen corresponding path program 23 times [2020-07-21 19:39:07,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:39:07,571 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [778512446] [2020-07-21 19:39:07,571 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:39:08,906 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:39:08,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:39:08,912 INFO L263 TraceCheckSpWp]: Trace formula consists of 2593 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:39:08,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:39:09,620 INFO L134 CoverageAnalysis]: Checked inductivity of 40382 backedges. 859 proven. 2226 refuted. 0 times theorem prover too weak. 37297 trivial. 0 not checked. [2020-07-21 19:39:09,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:39:20,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:20,379 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:24,477 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:27,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:27,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:27,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:28,224 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:28,225 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:28,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:28,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:28,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:28,606 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:29,080 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:30,542 INFO L134 CoverageAnalysis]: Checked inductivity of 40382 backedges. 859 proven. 2249 refuted. 0 times theorem prover too weak. 37274 trivial. 0 not checked. [2020-07-21 19:39:30,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [778512446] [2020-07-21 19:39:30,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:39:30,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:39:30,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1176206505] [2020-07-21 19:39:30,545 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:39:30,545 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:39:30,545 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:39:30,546 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:39:30,546 INFO L87 Difference]: Start difference. First operand 235 states and 647 transitions. Second operand 19 states. [2020-07-21 19:39:31,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:39:31,438 INFO L93 Difference]: Finished difference Result 394 states and 1463 transitions. [2020-07-21 19:39:31,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:39:31,441 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 1167 [2020-07-21 19:39:31,442 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:39:31,449 INFO L225 Difference]: With dead ends: 394 [2020-07-21 19:39:31,450 INFO L226 Difference]: Without dead ends: 376 [2020-07-21 19:39:31,452 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2340 GetRequests, 2301 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:39:31,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2020-07-21 19:39:31,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 226. [2020-07-21 19:39:31,491 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 226 states. [2020-07-21 19:39:31,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 226 states to 226 states and 597 transitions. [2020-07-21 19:39:31,494 INFO L78 Accepts]: Start accepts. Automaton has 226 states and 597 transitions. Word has length 1167 [2020-07-21 19:39:31,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:39:31,494 INFO L479 AbstractCegarLoop]: Abstraction has 226 states and 597 transitions. [2020-07-21 19:39:31,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:39:31,494 INFO L276 IsEmpty]: Start isEmpty. Operand 226 states and 597 transitions. [2020-07-21 19:39:31,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1329 [2020-07-21 19:39:31,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:39:31,511 INFO L422 BasicCegarLoop]: trace histogram [102, 102, 93, 93, 78, 73, 51, 51, 51, 51, 51, 51, 51, 46, 46, 46, 46, 46, 46, 46, 32, 24, 22, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:39:31,711 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:39:31,712 INFO L427 AbstractCegarLoop]: === Iteration 45 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:39:31,712 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:39:31,713 INFO L82 PathProgramCache]: Analyzing trace with hash 1178938846, now seen corresponding path program 24 times [2020-07-21 19:39:31,713 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:39:31,714 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891433345] [2020-07-21 19:39:31,714 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:39:33,213 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:39:33,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:39:33,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 2951 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:39:33,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:39:34,195 INFO L134 CoverageAnalysis]: Checked inductivity of 52587 backedges. 1068 proven. 3067 refuted. 0 times theorem prover too weak. 48452 trivial. 0 not checked. [2020-07-21 19:39:34,195 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:39:47,432 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:50,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:51,426 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:51,427 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:52,122 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:52,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:52,910 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:52,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:53,056 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:53,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:55,908 INFO L134 CoverageAnalysis]: Checked inductivity of 52587 backedges. 1072 proven. 3096 refuted. 0 times theorem prover too weak. 48419 trivial. 0 not checked. [2020-07-21 19:39:55,909 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891433345] [2020-07-21 19:39:55,909 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:39:55,909 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:39:55,909 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514665457] [2020-07-21 19:39:55,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:39:55,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:39:55,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:39:55,911 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:39:55,911 INFO L87 Difference]: Start difference. First operand 226 states and 597 transitions. Second operand 21 states. [2020-07-21 19:39:56,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:39:56,892 INFO L93 Difference]: Finished difference Result 357 states and 1259 transitions. [2020-07-21 19:39:56,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:39:56,896 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1328 [2020-07-21 19:39:56,897 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:39:56,904 INFO L225 Difference]: With dead ends: 357 [2020-07-21 19:39:56,904 INFO L226 Difference]: Without dead ends: 348 [2020-07-21 19:39:56,906 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2663 GetRequests, 2619 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:39:56,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-07-21 19:39:56,948 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 275. [2020-07-21 19:39:56,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 275 states. [2020-07-21 19:39:56,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 275 states to 275 states and 870 transitions. [2020-07-21 19:39:56,955 INFO L78 Accepts]: Start accepts. Automaton has 275 states and 870 transitions. Word has length 1328 [2020-07-21 19:39:56,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:39:56,956 INFO L479 AbstractCegarLoop]: Abstraction has 275 states and 870 transitions. [2020-07-21 19:39:56,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:39:56,956 INFO L276 IsEmpty]: Start isEmpty. Operand 275 states and 870 transitions. [2020-07-21 19:39:56,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1069 [2020-07-21 19:39:56,968 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:39:56,968 INFO L422 BasicCegarLoop]: trace histogram [81, 81, 76, 76, 60, 59, 40, 40, 40, 40, 40, 40, 40, 38, 38, 38, 38, 38, 38, 38, 22, 21, 20, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:39:57,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:39:57,169 INFO L427 AbstractCegarLoop]: === Iteration 46 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:39:57,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:39:57,170 INFO L82 PathProgramCache]: Analyzing trace with hash -2007810489, now seen corresponding path program 25 times [2020-07-21 19:39:57,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:39:57,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [812671904] [2020-07-21 19:39:57,171 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:39:58,608 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:39:58,609 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:39:58,616 INFO L263 TraceCheckSpWp]: Trace formula consists of 2374 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:39:58,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:39:59,475 INFO L134 CoverageAnalysis]: Checked inductivity of 33773 backedges. 1171 proven. 2465 refuted. 0 times theorem prover too weak. 30137 trivial. 0 not checked. [2020-07-21 19:39:59,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:40:02,968 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 19:40:03,076 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 19:40:10,777 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:14,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:14,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:16,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:17,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:17,267 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:18,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:18,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:18,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:18,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:18,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:18,876 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:19,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:19,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:22,313 INFO L134 CoverageAnalysis]: Checked inductivity of 33773 backedges. 1175 proven. 2501 refuted. 0 times theorem prover too weak. 30097 trivial. 0 not checked. [2020-07-21 19:40:22,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [812671904] [2020-07-21 19:40:22,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:40:22,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 19:40:22,314 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [336975515] [2020-07-21 19:40:22,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:40:22,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:40:22,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:40:22,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:40:22,315 INFO L87 Difference]: Start difference. First operand 275 states and 870 transitions. Second operand 23 states. [2020-07-21 19:40:23,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:40:23,679 INFO L93 Difference]: Finished difference Result 365 states and 1327 transitions. [2020-07-21 19:40:23,683 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:40:23,684 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1068 [2020-07-21 19:40:23,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:40:23,692 INFO L225 Difference]: With dead ends: 365 [2020-07-21 19:40:23,693 INFO L226 Difference]: Without dead ends: 356 [2020-07-21 19:40:23,695 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2144 GetRequests, 2095 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 220 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:40:23,695 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2020-07-21 19:40:23,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 271. [2020-07-21 19:40:23,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 271 states. [2020-07-21 19:40:23,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 816 transitions. [2020-07-21 19:40:23,729 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 816 transitions. Word has length 1068 [2020-07-21 19:40:23,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:40:23,729 INFO L479 AbstractCegarLoop]: Abstraction has 271 states and 816 transitions. [2020-07-21 19:40:23,729 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:40:23,729 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 816 transitions. [2020-07-21 19:40:23,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1195 [2020-07-21 19:40:23,742 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:40:23,743 INFO L422 BasicCegarLoop]: trace histogram [91, 91, 84, 84, 70, 67, 45, 45, 45, 45, 45, 45, 45, 42, 42, 42, 42, 42, 42, 42, 28, 22, 21, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:40:23,943 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:40:23,944 INFO L427 AbstractCegarLoop]: === Iteration 47 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:40:23,944 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:40:23,945 INFO L82 PathProgramCache]: Analyzing trace with hash -895062452, now seen corresponding path program 26 times [2020-07-21 19:40:23,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:40:23,946 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511047969] [2020-07-21 19:40:23,946 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:40:25,470 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:40:25,470 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:40:25,478 INFO L263 TraceCheckSpWp]: Trace formula consists of 2653 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:40:25,489 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:40:26,489 INFO L134 CoverageAnalysis]: Checked inductivity of 42354 backedges. 1477 proven. 3117 refuted. 0 times theorem prover too weak. 37760 trivial. 0 not checked. [2020-07-21 19:40:26,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:40:29,676 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:40:29,785 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:40:29,896 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 19:40:30,007 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 19:40:30,931 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 19:40:31,049 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 52 [2020-07-21 19:40:31,186 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:40:31,309 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:40:31,429 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 19:40:31,540 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 19:40:31,646 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:40:39,157 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 19:40:39,818 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:40:39,927 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:40:40,041 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 19:40:40,155 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 50 [2020-07-21 19:40:40,266 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 65 [2020-07-21 19:40:40,368 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 62 [2020-07-21 19:40:40,969 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:45,767 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 19:40:45,870 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 19:40:46,463 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:48,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:50,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:50,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:52,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:53,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:53,085 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:53,631 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:53,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:53,947 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:54,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:54,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:54,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:40:56,888 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 19:40:57,595 INFO L134 CoverageAnalysis]: Checked inductivity of 42354 backedges. 1479 proven. 3171 refuted. 0 times theorem prover too weak. 37704 trivial. 0 not checked. [2020-07-21 19:40:57,596 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511047969] [2020-07-21 19:40:57,596 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:40:57,596 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 23] total 25 [2020-07-21 19:40:57,597 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [273104789] [2020-07-21 19:40:57,597 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:40:57,597 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:40:57,598 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:40:57,598 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=493, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:40:57,598 INFO L87 Difference]: Start difference. First operand 271 states and 816 transitions. Second operand 25 states. [2020-07-21 19:40:59,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:40:59,396 INFO L93 Difference]: Finished difference Result 387 states and 1232 transitions. [2020-07-21 19:40:59,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:40:59,400 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 1194 [2020-07-21 19:40:59,401 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:40:59,408 INFO L225 Difference]: With dead ends: 387 [2020-07-21 19:40:59,408 INFO L226 Difference]: Without dead ends: 356 [2020-07-21 19:40:59,411 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2397 GetRequests, 2343 SyntacticMatches, 21 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=237, Invalid=953, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:40:59,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 356 states. [2020-07-21 19:40:59,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 356 to 321. [2020-07-21 19:40:59,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 321 states. [2020-07-21 19:40:59,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 321 states to 321 states and 951 transitions. [2020-07-21 19:40:59,458 INFO L78 Accepts]: Start accepts. Automaton has 321 states and 951 transitions. Word has length 1194 [2020-07-21 19:40:59,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:40:59,459 INFO L479 AbstractCegarLoop]: Abstraction has 321 states and 951 transitions. [2020-07-21 19:40:59,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:40:59,459 INFO L276 IsEmpty]: Start isEmpty. Operand 321 states and 951 transitions. [2020-07-21 19:40:59,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1137 [2020-07-21 19:40:59,475 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:40:59,475 INFO L422 BasicCegarLoop]: trace histogram [86, 86, 81, 81, 66, 61, 43, 43, 43, 43, 43, 43, 43, 40, 40, 40, 40, 40, 40, 40, 26, 20, 20, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:40:59,689 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:40:59,690 INFO L427 AbstractCegarLoop]: === Iteration 48 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:40:59,690 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:40:59,691 INFO L82 PathProgramCache]: Analyzing trace with hash -818099848, now seen corresponding path program 27 times [2020-07-21 19:40:59,691 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:40:59,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [206348253] [2020-07-21 19:40:59,692 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:41:01,239 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:41:01,240 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:41:01,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 2525 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:41:01,256 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:41:02,121 INFO L134 CoverageAnalysis]: Checked inductivity of 38287 backedges. 1068 proven. 2374 refuted. 0 times theorem prover too weak. 34845 trivial. 0 not checked. [2020-07-21 19:41:02,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:41:06,149 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 19:41:06,255 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 19:41:14,554 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:14,555 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:20,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:22,025 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:22,026 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:23,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:23,547 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:24,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:24,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:24,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:24,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:24,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:24,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:25,757 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:28,159 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 19:41:29,236 INFO L134 CoverageAnalysis]: Checked inductivity of 38287 backedges. 1070 proven. 2404 refuted. 0 times theorem prover too weak. 34813 trivial. 0 not checked. [2020-07-21 19:41:29,237 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [206348253] [2020-07-21 19:41:29,237 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:41:29,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 19] total 21 [2020-07-21 19:41:29,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287631389] [2020-07-21 19:41:29,238 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:41:29,238 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:41:29,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:41:29,239 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=79, Invalid=341, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:41:29,239 INFO L87 Difference]: Start difference. First operand 321 states and 951 transitions. Second operand 21 states. [2020-07-21 19:41:30,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:41:30,577 INFO L93 Difference]: Finished difference Result 520 states and 2089 transitions. [2020-07-21 19:41:30,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:41:30,582 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1136 [2020-07-21 19:41:30,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:41:30,595 INFO L225 Difference]: With dead ends: 520 [2020-07-21 19:41:30,595 INFO L226 Difference]: Without dead ends: 511 [2020-07-21 19:41:30,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2279 GetRequests, 2235 SyntacticMatches, 17 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 168 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=167, Invalid=645, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:41:30,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2020-07-21 19:41:30,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 316. [2020-07-21 19:41:30,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 316 states. [2020-07-21 19:41:30,661 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 907 transitions. [2020-07-21 19:41:30,662 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 907 transitions. Word has length 1136 [2020-07-21 19:41:30,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:41:30,663 INFO L479 AbstractCegarLoop]: Abstraction has 316 states and 907 transitions. [2020-07-21 19:41:30,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:41:30,663 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 907 transitions. [2020-07-21 19:41:30,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 873 [2020-07-21 19:41:30,681 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:41:30,681 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 62, 62, 52, 51, 32, 32, 32, 32, 32, 32, 32, 31, 31, 31, 31, 31, 31, 31, 20, 20, 14, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:41:30,895 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:41:30,896 INFO L427 AbstractCegarLoop]: === Iteration 49 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:41:30,896 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:41:30,897 INFO L82 PathProgramCache]: Analyzing trace with hash -1418153950, now seen corresponding path program 28 times [2020-07-21 19:41:30,898 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:41:30,898 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [837065434] [2020-07-21 19:41:30,898 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:41:32,291 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:41:32,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:41:32,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 1937 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:41:32,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:41:32,909 INFO L134 CoverageAnalysis]: Checked inductivity of 22329 backedges. 875 proven. 1443 refuted. 0 times theorem prover too weak. 20011 trivial. 0 not checked. [2020-07-21 19:41:32,910 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:41:36,819 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 39 [2020-07-21 19:41:43,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:48,037 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:48,038 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:49,069 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:49,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:49,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:50,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:50,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:50,731 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:50,944 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:51,846 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:41:55,184 INFO L134 CoverageAnalysis]: Checked inductivity of 22329 backedges. 877 proven. 1465 refuted. 0 times theorem prover too weak. 19987 trivial. 0 not checked. [2020-07-21 19:41:55,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [837065434] [2020-07-21 19:41:55,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:41:55,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 17] total 19 [2020-07-21 19:41:55,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1027359074] [2020-07-21 19:41:55,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:41:55,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:41:55,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:41:55,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=275, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:41:55,187 INFO L87 Difference]: Start difference. First operand 316 states and 907 transitions. Second operand 19 states. [2020-07-21 19:41:56,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:41:56,486 INFO L93 Difference]: Finished difference Result 613 states and 2780 transitions. [2020-07-21 19:41:56,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:41:56,493 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 872 [2020-07-21 19:41:56,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:41:56,510 INFO L225 Difference]: With dead ends: 613 [2020-07-21 19:41:56,510 INFO L226 Difference]: Without dead ends: 604 [2020-07-21 19:41:56,517 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1711 SyntacticMatches, 15 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 123 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=138, Invalid=512, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:41:56,518 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 604 states. [2020-07-21 19:41:56,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 604 to 318. [2020-07-21 19:41:56,581 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 318 states. [2020-07-21 19:41:56,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 318 states to 318 states and 927 transitions. [2020-07-21 19:41:56,586 INFO L78 Accepts]: Start accepts. Automaton has 318 states and 927 transitions. Word has length 872 [2020-07-21 19:41:56,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:41:56,586 INFO L479 AbstractCegarLoop]: Abstraction has 318 states and 927 transitions. [2020-07-21 19:41:56,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:41:56,586 INFO L276 IsEmpty]: Start isEmpty. Operand 318 states and 927 transitions. [2020-07-21 19:41:56,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-21 19:41:56,618 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:41:56,619 INFO L422 BasicCegarLoop]: trace histogram [138, 138, 133, 133, 108, 101, 69, 69, 69, 69, 69, 69, 69, 66, 66, 66, 66, 66, 66, 66, 42, 32, 32, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:41:56,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:41:56,826 INFO L427 AbstractCegarLoop]: === Iteration 50 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:41:56,826 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:41:56,828 INFO L82 PathProgramCache]: Analyzing trace with hash 1942262910, now seen corresponding path program 29 times [2020-07-21 19:41:56,828 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:41:56,828 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [879616398] [2020-07-21 19:41:56,829 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:41:58,622 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:41:58,623 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:41:58,636 INFO L263 TraceCheckSpWp]: Trace formula consists of 4093 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:41:58,651 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:42:00,248 INFO L134 CoverageAnalysis]: Checked inductivity of 101716 backedges. 1501 proven. 5023 refuted. 0 times theorem prover too weak. 95192 trivial. 0 not checked. [2020-07-21 19:42:00,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:42:03,186 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 19:42:03,306 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 19:42:03,411 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 19:42:03,635 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 19:42:03,752 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 19:42:03,877 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 19:42:04,002 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 19:42:05,650 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:42:05,783 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:42:05,924 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 19:42:06,063 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 19:42:09,711 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:42:09,859 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:42:10,020 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 19:42:10,179 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 19:42:10,334 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:42:10,477 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 19:42:10,612 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 19:42:10,735 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:42:10,851 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 19:42:10,961 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:42:11,064 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 19:42:36,463 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 19:42:36,572 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 19:42:36,679 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 19:42:36,797 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 19:42:36,914 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 19:42:37,040 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 19:42:37,163 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 19:42:38,886 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:42:39,024 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 42 [2020-07-21 19:42:39,170 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 19:42:39,318 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification that was a NOOP. DAG size: 45 [2020-07-21 19:42:39,469 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification that was a NOOP. DAG size: 58 [2020-07-21 19:42:39,596 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification that was a NOOP. DAG size: 55 [2020-07-21 19:42:39,715 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 19:42:39,827 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 48 [2020-07-21 19:42:39,930 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 19:42:40,185 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:42:51,723 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 19:42:51,832 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 19:42:51,949 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 19:42:52,067 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 37 [2020-07-21 19:42:52,201 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 19:42:52,338 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification that was a NOOP. DAG size: 40 [2020-07-21 19:42:52,461 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 19:42:52,574 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 47 [2020-07-21 19:42:52,681 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 43 [2020-07-21 19:42:52,945 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:42:52,946 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:42:54,965 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 32 [2020-07-21 19:42:55,177 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 19:42:55,289 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 35 [2020-07-21 19:42:55,401 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 44 [2020-07-21 19:42:55,649 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:42:57,727 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:42:57,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:42:59,096 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:42:59,608 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:42:59,609 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:42:59,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:42:59,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:00,147 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:00,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:00,343 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:01,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:05,104 INFO L134 CoverageAnalysis]: Checked inductivity of 101716 backedges. 1507 proven. 5061 refuted. 0 times theorem prover too weak. 95148 trivial. 0 not checked. [2020-07-21 19:43:05,104 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [879616398] [2020-07-21 19:43:05,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:43:05,105 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 21] total 23 [2020-07-21 19:43:05,105 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [132574119] [2020-07-21 19:43:05,106 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:43:05,106 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:43:05,106 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:43:05,106 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=413, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:43:05,106 INFO L87 Difference]: Start difference. First operand 318 states and 927 transitions. Second operand 23 states. [2020-07-21 19:43:07,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:43:07,312 INFO L93 Difference]: Finished difference Result 479 states and 1506 transitions. [2020-07-21 19:43:07,317 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:43:07,318 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-21 19:43:07,319 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:43:07,328 INFO L225 Difference]: With dead ends: 479 [2020-07-21 19:43:07,328 INFO L226 Difference]: Without dead ends: 443 [2020-07-21 19:43:07,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3643 SyntacticMatches, 19 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 251 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=202, Invalid=790, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:43:07,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2020-07-21 19:43:07,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 286. [2020-07-21 19:43:07,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 286 states. [2020-07-21 19:43:07,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 815 transitions. [2020-07-21 19:43:07,367 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 815 transitions. Word has length 1842 [2020-07-21 19:43:07,368 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:43:07,368 INFO L479 AbstractCegarLoop]: Abstraction has 286 states and 815 transitions. [2020-07-21 19:43:07,368 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:43:07,368 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 815 transitions. [2020-07-21 19:43:07,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1549 [2020-07-21 19:43:07,385 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:43:07,386 INFO L422 BasicCegarLoop]: trace histogram [114, 114, 113, 113, 92, 87, 57, 57, 57, 57, 57, 57, 57, 56, 56, 56, 56, 56, 56, 56, 36, 30, 26, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:43:07,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:07,589 INFO L427 AbstractCegarLoop]: === Iteration 51 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:43:07,590 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:43:07,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1745680478, now seen corresponding path program 30 times [2020-07-21 19:43:07,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:43:07,592 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [289645804] [2020-07-21 19:43:07,592 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:43:09,237 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:43:09,237 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:43:09,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 3439 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:43:09,257 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:43:10,325 INFO L134 CoverageAnalysis]: Checked inductivity of 71547 backedges. 1167 proven. 3057 refuted. 0 times theorem prover too weak. 67323 trivial. 0 not checked. [2020-07-21 19:43:10,325 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:43:28,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:43:37,176 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts