/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 BIGGEST_EQUIVALENCE_CLASS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_25-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 22:08:23,439 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 22:08:23,443 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 22:08:23,457 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 22:08:23,458 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 22:08:23,459 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 22:08:23,461 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 22:08:23,463 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 22:08:23,465 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 22:08:23,466 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 22:08:23,467 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 22:08:23,468 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 22:08:23,468 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 22:08:23,470 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 22:08:23,471 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 22:08:23,473 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 22:08:23,474 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 22:08:23,475 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 22:08:23,476 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 22:08:23,479 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 22:08:23,481 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 22:08:23,483 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 22:08:23,484 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 22:08:23,485 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 22:08:23,489 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 22:08:23,498 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 22:08:23,499 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 22:08:23,500 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 22:08:23,501 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 22:08:23,518 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 22:08:23,518 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 22:08:23,520 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 22:08:23,520 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 22:08:23,520 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 22:08:23,520 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 22:08:23,521 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 22:08:23,521 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 22:08:23,521 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 22:08:23,521 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 22:08:23,521 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 22:08:23,522 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 22:08:23,522 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 22:08:23,522 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 22:08:23,522 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 22:08:23,522 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 22:08:23,523 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 22:08:23,523 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 22:08:23,523 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 22:08:23,523 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 22:08:23,523 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 22:08:23,524 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 22:08:23,524 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 22:08:23,524 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 22:08:23,524 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 22:08:23,524 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 22:08:23,525 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:23,525 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 22:08:23,525 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 22:08:23,525 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 -> BIGGEST_EQUIVALENCE_CLASS 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 -> 4 [2020-07-21 22:08:23,841 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 22:08:23,872 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 22:08:23,877 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 22:08:23,879 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 22:08:23,882 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 22:08:23,884 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-2.c [2020-07-21 22:08:23,985 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff30953f3/54fda2e83964461c840d3e5e8fe9931c/FLAG045b18539 [2020-07-21 22:08:24,523 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 22:08:24,524 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-2.c [2020-07-21 22:08:24,533 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff30953f3/54fda2e83964461c840d3e5e8fe9931c/FLAG045b18539 [2020-07-21 22:08:24,862 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/ff30953f3/54fda2e83964461c840d3e5e8fe9931c [2020-07-21 22:08:24,872 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 22:08:24,877 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 22:08:24,878 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 22:08:24,879 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 22:08:24,882 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 22:08:24,884 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:08:24" (1/1) ... [2020-07-21 22:08:24,887 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@24f83d1e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:08:24, skipping insertion in model container [2020-07-21 22:08:24,888 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 10:08:24" (1/1) ... [2020-07-21 22:08:24,898 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 22:08:24,919 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 22:08:25,107 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:08:25,113 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 22:08:25,127 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 22:08:25,140 INFO L208 MainTranslator]: Completed translation [2020-07-21 22:08:25,141 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:08:25 WrapperNode [2020-07-21 22:08:25,141 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 22:08:25,141 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 22:08:25,142 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 22:08:25,142 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 22:08:25,157 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:08:25" (1/1) ... [2020-07-21 22:08:25,157 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:08:25" (1/1) ... [2020-07-21 22:08:25,163 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:08:25" (1/1) ... [2020-07-21 22:08:25,163 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:08:25" (1/1) ... [2020-07-21 22:08:25,167 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:08:25" (1/1) ... [2020-07-21 22:08:25,170 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:08:25" (1/1) ... [2020-07-21 22:08:25,171 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:08:25" (1/1) ... [2020-07-21 22:08:25,172 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 22:08:25,173 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 22:08:25,173 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 22:08:25,173 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 22:08:25,174 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:08:25" (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 22:08:25,335 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 22:08:25,336 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 22:08:25,336 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 22:08:25,336 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 22:08:25,336 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 22:08:25,336 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 22:08:25,337 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 22:08:25,337 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 22:08:25,337 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 22:08:25,337 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 22:08:25,526 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 22:08:25,527 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 22:08:25,533 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:08:25 BoogieIcfgContainer [2020-07-21 22:08:25,534 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 22:08:25,535 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 22:08:25,536 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 22:08:25,540 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 22:08:25,541 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 10:08:24" (1/3) ... [2020-07-21 22:08:25,542 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30e15f67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:08:25, skipping insertion in model container [2020-07-21 22:08:25,543 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 10:08:25" (2/3) ... [2020-07-21 22:08:25,544 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@30e15f67 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 10:08:25, skipping insertion in model container [2020-07-21 22:08:25,544 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 10:08:25" (3/3) ... [2020-07-21 22:08:25,546 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-2.c [2020-07-21 22:08:25,561 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 22:08:25,572 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 22:08:25,608 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 22:08:25,649 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 22:08:25,649 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 22:08:25,649 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 22:08:25,650 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 22:08:25,651 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 22:08:25,652 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 22:08:25,652 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 22:08:25,652 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 22:08:25,681 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 22:08:25,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 22:08:25,692 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:25,693 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:25,694 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:25,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:25,706 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 22:08:25,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:25,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [84482343] [2020-07-21 22:08:25,718 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:25,797 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:08:25,797 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:25,801 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:08:25,808 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:25,905 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 22:08:25,905 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:08:25,907 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [84482343] [2020-07-21 22:08:25,908 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:08:25,908 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:08:25,910 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [607183201] [2020-07-21 22:08:25,916 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:08:25,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:25,928 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:08:25,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:08:25,932 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 22:08:26,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:26,067 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 22:08:26,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:08:26,075 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 22:08:26,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:26,096 INFO L225 Difference]: With dead ends: 35 [2020-07-21 22:08:26,096 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 22:08:26,101 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 22:08:26,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 22:08:26,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 22:08:26,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:08:26,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:08:26,157 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 22:08:26,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:26,158 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:08:26,158 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:08:26,158 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:08:26,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 22:08:26,161 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:26,161 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:26,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:26,378 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:26,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:26,379 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 22:08:26,380 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:26,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263991346] [2020-07-21 22:08:26,380 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:26,406 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-21 22:08:26,406 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:26,408 INFO L263 TraceCheckSpWp]: Trace formula consists of 30 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 22:08:26,409 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:26,459 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 22:08:26,460 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 22:08:26,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263991346] [2020-07-21 22:08:26,461 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 22:08:26,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 22:08:26,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [967282524] [2020-07-21 22:08:26,464 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 22:08:26,464 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:26,465 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 22:08:26,465 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 22:08:26,465 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 22:08:26,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:26,549 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 22:08:26,550 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 22:08:26,550 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 22:08:26,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:26,552 INFO L225 Difference]: With dead ends: 27 [2020-07-21 22:08:26,552 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 22:08:26,554 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 22:08:26,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 22:08:26,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 22:08:26,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 22:08:26,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 22:08:26,564 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 22:08:26,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:26,564 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 22:08:26,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 22:08:26,565 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 22:08:26,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 22:08:26,566 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:26,566 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:26,779 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:26,780 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:26,781 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:26,782 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 22:08:26,782 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:26,783 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [998495071] [2020-07-21 22:08:26,783 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:26,819 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:08:26,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:26,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:08:26,823 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:26,895 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 22:08:26,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:27,133 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:27,186 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:08:27,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [998495071] [2020-07-21 22:08:27,188 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:27,188 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:08:27,188 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857866174] [2020-07-21 22:08:27,189 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:08:27,190 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:27,190 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:08:27,191 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:08:27,191 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 22:08:27,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:27,315 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 22:08:27,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:08:27,316 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 22:08:27,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:27,318 INFO L225 Difference]: With dead ends: 32 [2020-07-21 22:08:27,318 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 22:08:27,319 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:08:27,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 22:08:27,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 22:08:27,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:08:27,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:08:27,330 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 22:08:27,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:27,331 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:08:27,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:08:27,331 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:08:27,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 22:08:27,333 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:27,333 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:27,547 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:27,549 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:27,549 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:27,549 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 22:08:27,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:27,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473872047] [2020-07-21 22:08:27,551 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:27,576 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:08:27,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:27,577 INFO L263 TraceCheckSpWp]: Trace formula consists of 32 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 22:08:27,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:27,625 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 22:08:27,625 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:27,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:27,816 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 22:08:27,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473872047] [2020-07-21 22:08:27,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:27,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 22:08:27,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1512740982] [2020-07-21 22:08:27,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 22:08:27,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:27,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 22:08:27,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 22:08:27,819 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 22:08:27,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:27,916 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 22:08:27,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 22:08:27,918 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 22:08:27,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:27,920 INFO L225 Difference]: With dead ends: 37 [2020-07-21 22:08:27,921 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 22:08:27,922 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:08:27,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 22:08:27,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 22:08:27,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 22:08:27,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 22:08:27,932 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 22:08:27,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:27,932 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 22:08:27,933 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 22:08:27,933 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 22:08:27,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 22:08:27,934 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:27,935 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:28,148 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:28,149 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:28,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:28,150 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 22:08:28,151 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:28,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [62229576] [2020-07-21 22:08:28,152 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:28,199 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:08:28,199 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:28,201 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:08:28,204 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:28,255 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 22:08:28,255 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:28,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:28,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:28,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:28,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:28,643 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 22:08:28,644 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [62229576] [2020-07-21 22:08:28,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:28,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:08:28,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725378183] [2020-07-21 22:08:28,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:08:28,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:28,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:08:28,649 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:08:28,649 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 22:08:28,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:28,871 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 22:08:28,871 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:08:28,872 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 22:08:28,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:28,874 INFO L225 Difference]: With dead ends: 42 [2020-07-21 22:08:28,874 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 22:08:28,875 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:08:28,876 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 22:08:28,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 22:08:28,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:08:28,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:08:28,887 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 22:08:28,888 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:28,888 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:08:28,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:08:28,888 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:08:28,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 22:08:28,891 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:28,891 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:29,093 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:29,096 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:29,097 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:29,097 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 22:08:29,097 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:29,098 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1395685924] [2020-07-21 22:08:29,098 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:29,125 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:08:29,125 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:29,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 22:08:29,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:29,187 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 22:08:29,191 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:29,437 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:29,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:29,502 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:29,539 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 22:08:29,540 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1395685924] [2020-07-21 22:08:29,540 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:29,540 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 22:08:29,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1362808165] [2020-07-21 22:08:29,541 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 22:08:29,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:29,542 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 22:08:29,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 22:08:29,543 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 22:08:29,709 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:29,710 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 22:08:29,710 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 22:08:29,710 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 22:08:29,711 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:29,717 INFO L225 Difference]: With dead ends: 47 [2020-07-21 22:08:29,717 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 22:08:29,720 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 22:08:29,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 22:08:29,745 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 22:08:29,746 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 22:08:29,747 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 22:08:29,748 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 22:08:29,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:29,748 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 22:08:29,749 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 22:08:29,749 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 22:08:29,756 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 22:08:29,757 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:29,757 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:29,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:29,973 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:29,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:29,974 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 22:08:29,975 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:29,976 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1975535904] [2020-07-21 22:08:29,976 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:30,012 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-21 22:08:30,012 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:30,013 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:08:30,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:30,084 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 22:08:30,084 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:30,559 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:30,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:30,661 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:30,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:30,725 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:30,778 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 22:08:30,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1975535904] [2020-07-21 22:08:30,779 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:30,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:08:30,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1297587166] [2020-07-21 22:08:30,782 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:08:30,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:30,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:08:30,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:08:30,784 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 22:08:30,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:30,982 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 22:08:30,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:08:30,983 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 22:08:30,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:30,986 INFO L225 Difference]: With dead ends: 52 [2020-07-21 22:08:30,986 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 22:08:30,987 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:08:30,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 22:08:30,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 22:08:30,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:08:30,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:08:31,000 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 22:08:31,000 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:31,000 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:08:31,000 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:08:31,001 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:08:31,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 22:08:31,003 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:31,004 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:31,207 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:31,209 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:31,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:31,209 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 22:08:31,210 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:31,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [658702720] [2020-07-21 22:08:31,211 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:31,266 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:31,267 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:31,268 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 22:08:31,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:31,361 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 22:08:31,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:31,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:31,942 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:31,949 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:32,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:32,050 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 22:08:32,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [658702720] [2020-07-21 22:08:32,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:32,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 22:08:32,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588195642] [2020-07-21 22:08:32,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 22:08:32,055 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:32,056 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 22:08:32,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 22:08:32,057 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 22:08:32,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:32,226 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 22:08:32,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 22:08:32,228 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 22:08:32,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:32,230 INFO L225 Difference]: With dead ends: 57 [2020-07-21 22:08:32,230 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 22:08:32,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:08:32,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 22:08:32,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 22:08:32,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 22:08:32,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 22:08:32,246 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 22:08:32,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:32,247 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 22:08:32,247 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 22:08:32,248 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 22:08:32,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 22:08:32,250 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:32,251 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:32,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:32,465 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:32,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:32,466 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 22:08:32,466 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:32,466 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234620956] [2020-07-21 22:08:32,467 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:32,513 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:32,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:32,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:08:32,518 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:32,609 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 22:08:32,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:33,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:33,266 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:33,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:33,577 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:33,638 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:33,683 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 22:08:33,684 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234620956] [2020-07-21 22:08:33,684 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:33,684 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 22:08:33,684 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394438081] [2020-07-21 22:08:33,685 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:08:33,685 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:33,685 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:08:33,686 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:08:33,686 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 22:08:33,997 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:33,998 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 22:08:33,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:08:33,999 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 22:08:33,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:34,001 INFO L225 Difference]: With dead ends: 62 [2020-07-21 22:08:34,001 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 22:08:34,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:08:34,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 22:08:34,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 22:08:34,015 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:08:34,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 22:08:34,017 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 22:08:34,018 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:34,018 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 22:08:34,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:08:34,018 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 22:08:34,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 22:08:34,022 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:34,022 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:34,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:34,236 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:34,237 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:34,237 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 22:08:34,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:34,238 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2084423763] [2020-07-21 22:08:34,239 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:34,306 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:34,307 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:34,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 22:08:34,313 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:34,422 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 22:08:34,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:35,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,445 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,531 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,592 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:35,654 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 22:08:35,655 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2084423763] [2020-07-21 22:08:35,655 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:35,655 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 22:08:35,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599509560] [2020-07-21 22:08:35,656 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 22:08:35,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:35,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 22:08:35,657 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 22:08:35,657 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 22:08:35,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:35,862 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 22:08:35,863 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 22:08:35,863 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 22:08:35,864 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:35,867 INFO L225 Difference]: With dead ends: 67 [2020-07-21 22:08:35,867 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 22:08:35,869 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 22:08:35,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 22:08:35,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 22:08:35,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 22:08:35,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 22:08:35,884 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 22:08:35,884 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:35,885 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 22:08:35,885 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 22:08:35,885 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 22:08:35,889 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 22:08:35,890 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:35,890 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:36,105 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:36,106 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:36,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:36,106 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 22:08:36,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:36,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1465663400] [2020-07-21 22:08:36,107 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:36,193 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:36,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:36,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:08:36,223 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:36,358 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 22:08:36,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:37,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:38,013 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:38,178 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:38,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:38,309 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:38,310 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:38,431 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 22:08:38,432 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1465663400] [2020-07-21 22:08:38,432 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:38,433 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 22:08:38,433 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807304912] [2020-07-21 22:08:38,434 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:08:38,434 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:38,435 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:08:38,435 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:08:38,435 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 22:08:38,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:38,696 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 22:08:38,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:08:38,697 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 22:08:38,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:38,701 INFO L225 Difference]: With dead ends: 72 [2020-07-21 22:08:38,702 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 22:08:38,703 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:08:38,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 22:08:38,732 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 22:08:38,733 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 22:08:38,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 22:08:38,734 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 22:08:38,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:38,737 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 22:08:38,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:08:38,737 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 22:08:38,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-21 22:08:38,744 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:38,744 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:38,957 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:38,958 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:38,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:38,959 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-21 22:08:38,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:38,960 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [950572799] [2020-07-21 22:08:38,960 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:39,061 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:39,061 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:39,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 168 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 22:08:39,069 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:39,252 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-21 22:08:39,253 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:40,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:41,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:41,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:41,465 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:41,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:41,519 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:41,612 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-21 22:08:41,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [950572799] [2020-07-21 22:08:41,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:41,613 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 22:08:41,613 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831852140] [2020-07-21 22:08:41,614 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 22:08:41,614 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:41,614 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 22:08:41,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 22:08:41,615 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 22:08:41,876 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:41,877 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 22:08:41,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 22:08:41,878 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-21 22:08:41,879 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:41,882 INFO L225 Difference]: With dead ends: 77 [2020-07-21 22:08:41,883 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 22:08:41,884 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:08:41,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 22:08:41,897 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 22:08:41,898 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 22:08:41,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 22:08:41,901 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-21 22:08:41,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:41,902 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 22:08:41,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 22:08:41,902 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 22:08:41,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-21 22:08:41,916 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:41,917 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:42,131 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:42,132 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:42,132 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:42,132 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-21 22:08:42,133 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:42,133 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1087357197] [2020-07-21 22:08:42,133 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:42,279 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:42,280 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:42,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:08:42,296 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:42,625 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-21 22:08:42,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:44,867 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:45,447 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:45,848 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:46,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:46,076 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:46,161 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:46,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:46,220 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:46,433 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-21 22:08:46,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1087357197] [2020-07-21 22:08:46,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:46,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 22:08:46,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [279379599] [2020-07-21 22:08:46,435 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:08:46,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:46,436 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:08:46,436 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:08:46,436 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 22:08:46,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:46,944 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 22:08:46,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:08:46,945 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-21 22:08:46,946 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:46,951 INFO L225 Difference]: With dead ends: 82 [2020-07-21 22:08:46,952 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 22:08:46,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 22:08:46,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 22:08:46,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 22:08:46,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 22:08:46,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 22:08:46,982 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-21 22:08:46,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:46,986 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 22:08:46,986 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:08:46,986 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 22:08:46,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 22:08:46,990 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:46,990 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:47,205 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:47,206 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:47,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:47,207 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 22:08:47,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:47,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [518300610] [2020-07-21 22:08:47,209 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:47,349 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:47,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:47,351 INFO L263 TraceCheckSpWp]: Trace formula consists of 248 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 22:08:47,359 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:47,559 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 22:08:47,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:49,418 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:50,083 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:50,084 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:50,430 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:50,431 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:50,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:50,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:50,689 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:50,736 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:50,884 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 22:08:50,884 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [518300610] [2020-07-21 22:08:50,884 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:50,884 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 22:08:50,885 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820737917] [2020-07-21 22:08:50,885 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 22:08:50,886 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:50,886 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 22:08:50,887 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 22:08:50,887 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 22:08:51,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:08:51,193 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 22:08:51,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 22:08:51,194 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 22:08:51,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:08:51,199 INFO L225 Difference]: With dead ends: 87 [2020-07-21 22:08:51,199 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 22:08:51,201 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 22:08:51,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 22:08:51,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 22:08:51,222 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 22:08:51,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 22:08:51,228 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 22:08:51,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:08:51,229 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 22:08:51,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 22:08:51,229 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 22:08:51,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-21 22:08:51,243 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:08:51,244 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:08:51,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:08:51,458 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:08:51,459 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:08:51,460 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-21 22:08:51,460 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:08:51,460 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1334707568] [2020-07-21 22:08:51,461 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:08:51,745 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:08:51,746 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:08:51,750 INFO L263 TraceCheckSpWp]: Trace formula consists of 593 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:08:51,770 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:08:52,394 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-21 22:08:52,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:08:56,383 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:56,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:57,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:58,328 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:58,329 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:58,743 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:58,745 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:58,917 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:58,919 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:59,016 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:59,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:59,110 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:08:59,605 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-21 22:08:59,606 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1334707568] [2020-07-21 22:08:59,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:08:59,607 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 22:08:59,607 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [195842278] [2020-07-21 22:08:59,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:08:59,609 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:08:59,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:08:59,610 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:08:59,610 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 22:09:00,301 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:09:00,301 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 22:09:00,302 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:09:00,302 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-21 22:09:00,305 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:09:00,310 INFO L225 Difference]: With dead ends: 92 [2020-07-21 22:09:00,310 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 22:09:00,315 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:09:00,315 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 22:09:00,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 22:09:00,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 22:09:00,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 22:09:00,343 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-21 22:09:00,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:09:00,345 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 22:09:00,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:09:00,346 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 22:09:00,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 657 [2020-07-21 22:09:00,352 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:09:00,353 INFO L422 BasicCegarLoop]: trace histogram [95, 95, 79, 47, 47, 47, 47, 47, 47, 47, 32, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:09:00,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:09:00,566 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:09:00,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:09:00,567 INFO L82 PathProgramCache]: Analyzing trace with hash -312379166, now seen corresponding path program 7 times [2020-07-21 22:09:00,567 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:09:00,568 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [418205051] [2020-07-21 22:09:00,568 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:09:00,770 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:09:00,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:09:00,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 22:09:00,783 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:09:01,111 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3394 refuted. 0 times theorem prover too weak. 21370 trivial. 0 not checked. [2020-07-21 22:09:01,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:09:03,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:03,879 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:04,807 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:05,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:05,355 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:05,646 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:05,647 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:05,840 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:05,954 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:06,027 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:06,433 INFO L134 CoverageAnalysis]: Checked inductivity of 25265 backedges. 501 proven. 3471 refuted. 0 times theorem prover too weak. 21293 trivial. 0 not checked. [2020-07-21 22:09:06,434 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [418205051] [2020-07-21 22:09:06,434 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:09:06,435 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 22:09:06,435 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889511185] [2020-07-21 22:09:06,436 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 22:09:06,436 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:09:06,437 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 22:09:06,437 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 22:09:06,437 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 22:09:07,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:09:07,041 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 22:09:07,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 22:09:07,042 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 656 [2020-07-21 22:09:07,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:09:07,047 INFO L225 Difference]: With dead ends: 97 [2020-07-21 22:09:07,047 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 22:09:07,048 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1319 GetRequests, 1276 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:09:07,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 22:09:07,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 22:09:07,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 22:09:07,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 22:09:07,064 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 656 [2020-07-21 22:09:07,065 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:09:07,065 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 22:09:07,066 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 22:09:07,066 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 22:09:07,085 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1275 [2020-07-21 22:09:07,085 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:09:07,086 INFO L422 BasicCegarLoop]: trace histogram [195, 195, 98, 97, 97, 97, 97, 97, 97, 97, 97, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:09:07,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:09:07,300 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:09:07,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:09:07,300 INFO L82 PathProgramCache]: Analyzing trace with hash 971855614, now seen corresponding path program 8 times [2020-07-21 22:09:07,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:09:07,301 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1020670461] [2020-07-21 22:09:07,301 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:09:07,692 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:09:07,692 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:09:07,695 INFO L263 TraceCheckSpWp]: Trace formula consists of 709 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 22:09:07,712 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:09:08,460 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7570 refuted. 0 times theorem prover too weak. 90202 trivial. 0 not checked. [2020-07-21 22:09:08,461 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:09:13,335 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:15,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:16,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:16,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:16,892 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:17,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:17,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:17,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:17,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:17,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:17,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:17,729 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:18,405 INFO L134 CoverageAnalysis]: Checked inductivity of 98940 backedges. 1168 proven. 7662 refuted. 0 times theorem prover too weak. 90110 trivial. 0 not checked. [2020-07-21 22:09:18,406 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1020670461] [2020-07-21 22:09:18,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:09:18,407 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 22:09:18,407 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001039961] [2020-07-21 22:09:18,409 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:09:18,409 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:09:18,409 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:09:18,410 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:09:18,410 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 22:09:19,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:09:19,360 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 22:09:19,363 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:09:19,364 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1274 [2020-07-21 22:09:19,366 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:09:19,369 INFO L225 Difference]: With dead ends: 102 [2020-07-21 22:09:19,370 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 22:09:19,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2557 GetRequests, 2509 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 22:09:19,373 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 22:09:19,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 22:09:19,387 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 22:09:19,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 22:09:19,389 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1274 [2020-07-21 22:09:19,391 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:09:19,391 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 22:09:19,391 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:09:19,391 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 22:09:19,423 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1821 [2020-07-21 22:09:19,423 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:09:19,424 INFO L422 BasicCegarLoop]: trace histogram [267, 267, 211, 133, 133, 133, 133, 133, 133, 133, 78, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:09:19,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:09:19,639 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:09:19,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:09:19,640 INFO L82 PathProgramCache]: Analyzing trace with hash 1926911020, now seen corresponding path program 8 times [2020-07-21 22:09:19,640 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:09:19,640 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1475463076] [2020-07-21 22:09:19,641 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:09:20,095 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:09:20,096 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:09:20,101 INFO L263 TraceCheckSpWp]: Trace formula consists of 1007 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 22:09:20,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:09:21,981 INFO L134 CoverageAnalysis]: Checked inductivity of 199311 backedges. 1523 proven. 11417 refuted. 0 times theorem prover too weak. 186371 trivial. 0 not checked. [2020-07-21 22:09:21,982 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:09:29,246 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:31,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:31,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:32,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:32,897 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:33,553 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:34,017 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:34,018 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:34,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:34,407 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:34,474 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:36,153 INFO L134 CoverageAnalysis]: Checked inductivity of 199311 backedges. 1523 proven. 11517 refuted. 0 times theorem prover too weak. 186271 trivial. 0 not checked. [2020-07-21 22:09:36,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1475463076] [2020-07-21 22:09:36,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:09:36,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 22:09:36,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254698791] [2020-07-21 22:09:36,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 22:09:36,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:09:36,158 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 22:09:36,159 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 22:09:36,159 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 22:09:37,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:09:37,131 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 22:09:37,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 22:09:37,132 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1820 [2020-07-21 22:09:37,136 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:09:37,140 INFO L225 Difference]: With dead ends: 107 [2020-07-21 22:09:37,140 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 22:09:37,142 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3648 GetRequests, 3600 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 22:09:37,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 22:09:37,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 22:09:37,161 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 22:09:37,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 22:09:37,164 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1820 [2020-07-21 22:09:37,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:09:37,165 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 22:09:37,165 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 22:09:37,166 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 22:09:37,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2029 [2020-07-21 22:09:37,210 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:09:37,211 INFO L422 BasicCegarLoop]: trace histogram [311, 311, 156, 155, 155, 155, 155, 155, 155, 155, 155, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:09:37,425 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:09:37,426 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:09:37,426 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:09:37,427 INFO L82 PathProgramCache]: Analyzing trace with hash -2013442466, now seen corresponding path program 9 times [2020-07-21 22:09:37,428 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:09:37,428 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [572827222] [2020-07-21 22:09:37,429 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:09:37,953 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:09:37,954 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:09:37,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 1128 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 22:09:37,986 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:09:40,020 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13739 refuted. 0 times theorem prover too weak. 236697 trivial. 0 not checked. [2020-07-21 22:09:40,021 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:09:48,094 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:52,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:54,318 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:55,356 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:55,357 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:56,091 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:56,092 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:56,415 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:56,417 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:56,628 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:56,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:56,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:09:58,306 INFO L134 CoverageAnalysis]: Checked inductivity of 252495 backedges. 2059 proven. 13856 refuted. 0 times theorem prover too weak. 236580 trivial. 0 not checked. [2020-07-21 22:09:58,306 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [572827222] [2020-07-21 22:09:58,306 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:09:58,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 22:09:58,307 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1661311511] [2020-07-21 22:09:58,309 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 22:09:58,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:09:58,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 22:09:58,310 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 22:09:58,310 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 22:09:59,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:09:59,532 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 22:09:59,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:09:59,534 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2028 [2020-07-21 22:09:59,536 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:09:59,542 INFO L225 Difference]: With dead ends: 112 [2020-07-21 22:09:59,542 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 22:09:59,544 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4066 GetRequests, 4013 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:09:59,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 22:09:59,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 22:09:59,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 22:09:59,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 22:09:59,565 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2028 [2020-07-21 22:09:59,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:09:59,567 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 22:09:59,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 22:09:59,567 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 22:09:59,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 3091 [2020-07-21 22:09:59,650 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:09:59,651 INFO L422 BasicCegarLoop]: trace histogram [453, 453, 365, 226, 226, 226, 226, 226, 226, 226, 139, 88, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:09:59,866 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:09:59,867 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:09:59,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:09:59,869 INFO L82 PathProgramCache]: Analyzing trace with hash 726071343, now seen corresponding path program 9 times [2020-07-21 22:09:59,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:09:59,870 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1398308412] [2020-07-21 22:09:59,871 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:10:00,537 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:10:00,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:10:00,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 1712 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 22:10:00,569 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:10:04,827 INFO L134 CoverageAnalysis]: Checked inductivity of 577642 backedges. 2981 proven. 21869 refuted. 0 times theorem prover too weak. 552792 trivial. 0 not checked. [2020-07-21 22:10:04,827 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:10:15,701 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:21,803 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:25,111 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:25,112 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:26,589 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:27,295 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:27,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:27,998 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:28,120 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:28,121 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:28,188 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:28,189 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:10:31,459 INFO L134 CoverageAnalysis]: Checked inductivity of 577642 backedges. 2981 proven. 21995 refuted. 0 times theorem prover too weak. 552666 trivial. 0 not checked. [2020-07-21 22:10:31,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1398308412] [2020-07-21 22:10:31,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:10:31,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 22:10:31,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1817712648] [2020-07-21 22:10:31,463 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 22:10:31,463 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:10:31,464 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 22:10:31,464 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 22:10:31,464 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 22:10:32,437 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:10:32,438 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 22:10:32,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 22:10:32,439 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 3090 [2020-07-21 22:10:32,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:10:32,447 INFO L225 Difference]: With dead ends: 117 [2020-07-21 22:10:32,448 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 22:10:32,449 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6189 GetRequests, 6136 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 22:10:32,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 22:10:32,468 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 22:10:32,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 22:10:32,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 22:10:32,470 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 3090 [2020-07-21 22:10:32,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:10:32,473 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 22:10:32,473 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 22:10:32,473 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 22:10:32,623 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4837 [2020-07-21 22:10:32,623 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:10:32,625 INFO L422 BasicCegarLoop]: trace histogram [743, 743, 372, 371, 371, 371, 371, 371, 371, 371, 371, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:10:32,825 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:10:32,826 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:10:32,827 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:10:32,829 INFO L82 PathProgramCache]: Analyzing trace with hash -2144636724, now seen corresponding path program 10 times [2020-07-21 22:10:32,829 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:10:32,830 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [87912584] [2020-07-21 22:10:32,830 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:10:33,802 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:10:33,803 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:10:33,814 INFO L263 TraceCheckSpWp]: Trace formula consists of 2694 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 22:10:33,867 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:10:42,866 INFO L134 CoverageAnalysis]: Checked inductivity of 1445787 backedges. 4470 proven. 37981 refuted. 0 times theorem prover too weak. 1403336 trivial. 0 not checked. [2020-07-21 22:10:42,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:11:08,136 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:08,137 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:14,970 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 29 [2020-07-21 22:11:17,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:20,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:23,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:24,774 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:25,758 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:25,759 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:26,294 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:26,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:26,694 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:26,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:11:34,569 INFO L134 CoverageAnalysis]: Checked inductivity of 1445787 backedges. 4470 proven. 38126 refuted. 0 times theorem prover too weak. 1403191 trivial. 0 not checked. [2020-07-21 22:11:34,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [87912584] [2020-07-21 22:11:34,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:11:34,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 22:11:34,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130586688] [2020-07-21 22:11:34,575 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 22:11:34,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:11:34,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 22:11:34,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 22:11:34,576 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 22:11:36,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:11:36,068 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 22:11:36,070 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 22:11:36,070 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4836 [2020-07-21 22:11:36,074 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:11:36,077 INFO L225 Difference]: With dead ends: 122 [2020-07-21 22:11:36,078 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 22:11:36,080 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9683 GetRequests, 9625 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 22:11:36,080 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 22:11:36,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 22:11:36,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 22:11:36,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 22:11:36,103 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4836 [2020-07-21 22:11:36,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:11:36,108 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 22:11:36,108 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 22:11:36,108 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 22:11:36,418 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7205 [2020-07-21 22:11:36,419 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:11:36,421 INFO L422 BasicCegarLoop]: trace histogram [1059, 1059, 843, 529, 529, 529, 529, 529, 529, 529, 314, 216, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:11:36,622 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:11:36,622 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:11:36,623 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:11:36,625 INFO L82 PathProgramCache]: Analyzing trace with hash 998927276, now seen corresponding path program 10 times [2020-07-21 22:11:36,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:11:36,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1925894409] [2020-07-21 22:11:36,626 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:11:37,912 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:11:37,913 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:11:37,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 4001 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 22:11:37,985 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:11:54,727 INFO L134 CoverageAnalysis]: Checked inductivity of 3154371 backedges. 6331 proven. 58410 refuted. 0 times theorem prover too weak. 3089630 trivial. 0 not checked. [2020-07-21 22:11:54,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:12:32,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:38,288 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 22:12:48,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:48,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:54,323 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:54,324 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:59,728 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:12:59,732 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:02,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:02,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:03,825 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:03,826 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:04,564 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:04,888 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:04,889 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:05,086 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:05,087 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:05,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:13:24,865 INFO L134 CoverageAnalysis]: Checked inductivity of 3154371 backedges. 6331 proven. 58565 refuted. 0 times theorem prover too weak. 3089475 trivial. 0 not checked. [2020-07-21 22:13:24,866 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1925894409] [2020-07-21 22:13:24,866 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:13:24,867 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 22:13:24,868 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471949463] [2020-07-21 22:13:24,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 22:13:24,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:13:24,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 22:13:24,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 22:13:24,873 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 22:13:26,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:13:26,444 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 22:13:26,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 22:13:26,450 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 7204 [2020-07-21 22:13:26,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:13:26,462 INFO L225 Difference]: With dead ends: 127 [2020-07-21 22:13:26,462 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 22:13:26,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14418 GetRequests, 14360 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 22:13:26,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 22:13:26,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 22:13:26,486 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 22:13:26,488 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 22:13:26,488 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 7204 [2020-07-21 22:13:26,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:13:26,494 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 22:13:26,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 22:13:26,494 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 22:13:26,733 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6176 [2020-07-21 22:13:26,734 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:13:26,736 INFO L422 BasicCegarLoop]: trace histogram [949, 949, 475, 474, 474, 474, 474, 474, 474, 474, 474, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:13:26,936 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:13:26,937 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:13:26,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:13:26,940 INFO L82 PathProgramCache]: Analyzing trace with hash -1487532817, now seen corresponding path program 11 times [2020-07-21 22:13:26,941 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:13:26,941 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1269087761] [2020-07-21 22:13:26,941 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:13:28,204 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:13:28,205 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:13:28,220 INFO L263 TraceCheckSpWp]: Trace formula consists of 3441 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 22:13:28,278 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:13:41,835 INFO L134 CoverageAnalysis]: Checked inductivity of 2359809 backedges. 6990 proven. 52504 refuted. 0 times theorem prover too weak. 2300315 trivial. 0 not checked. [2020-07-21 22:13:41,836 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:13:49,721 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 22:14:16,782 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:30,435 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:42,450 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:42,451 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:47,466 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:47,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:51,230 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:53,104 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:53,105 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:54,215 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:54,216 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:54,999 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:55,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:55,378 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:55,581 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:14:55,698 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:15:10,028 INFO L134 CoverageAnalysis]: Checked inductivity of 2359809 backedges. 6990 proven. 52680 refuted. 0 times theorem prover too weak. 2300139 trivial. 0 not checked. [2020-07-21 22:15:10,029 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1269087761] [2020-07-21 22:15:10,029 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:15:10,031 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 22:15:10,031 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [963088552] [2020-07-21 22:15:10,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 22:15:10,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:15:10,038 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 22:15:10,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:15:10,039 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 22:15:12,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:15:12,395 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 22:15:12,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:15:12,397 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 6175 [2020-07-21 22:15:12,402 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:15:12,408 INFO L225 Difference]: With dead ends: 132 [2020-07-21 22:15:12,408 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 22:15:12,410 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12362 GetRequests, 12299 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 22:15:12,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 22:15:12,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 22:15:12,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 22:15:12,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 22:15:12,443 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 6175 [2020-07-21 22:15:12,448 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:15:12,448 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 22:15:12,448 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 22:15:12,449 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 22:15:13,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8651 [2020-07-21 22:15:13,656 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:15:13,662 INFO L422 BasicCegarLoop]: trace histogram [1277, 1277, 981, 638, 638, 638, 638, 638, 638, 638, 343, 296, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:15:13,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:15:13,876 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:15:13,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:15:13,882 INFO L82 PathProgramCache]: Analyzing trace with hash -1942026073, now seen corresponding path program 11 times [2020-07-21 22:15:13,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:15:13,883 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1756144959] [2020-07-21 22:15:13,884 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:15:16,001 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:15:16,002 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:15:16,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 4803 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 22:15:16,120 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:15:50,183 INFO L134 CoverageAnalysis]: Checked inductivity of 4552406 backedges. 8160 proven. 76893 refuted. 0 times theorem prover too weak. 4467353 trivial. 0 not checked. [2020-07-21 22:15:50,184 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:15:53,651 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 22:15:53,755 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 22:15:57,471 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 22:15:57,587 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 22:15:57,704 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 22:15:57,828 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 22:16:02,680 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 22:16:02,798 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 22:16:02,931 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 22:16:03,047 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 22:16:03,173 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 22:16:03,286 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 22:16:03,507 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-21 22:16:03,619 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 22:16:03,725 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 67 [2020-07-21 22:16:46,539 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 22:16:57,069 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 22:16:57,182 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 22:16:57,318 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 22:16:57,429 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 22:16:59,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:16:59,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:12,824 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:23,990 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:23,991 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:29,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:29,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:32,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:32,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:33,778 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:33,779 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:34,563 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:34,976 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:35,270 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:35,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:35,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:35,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:35,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 22:17:58,394 INFO L134 CoverageAnalysis]: Checked inductivity of 4552406 backedges. 8160 proven. 77080 refuted. 0 times theorem prover too weak. 4467166 trivial. 0 not checked. [2020-07-21 22:17:58,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1756144959] [2020-07-21 22:17:58,395 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 22:17:58,398 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 22:17:58,398 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [346197219] [2020-07-21 22:17:58,402 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 22:17:58,402 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 22:17:58,402 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 22:17:58,403 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 22:17:58,403 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 22:18:00,383 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 22:18:00,383 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 22:18:00,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 22:18:00,385 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 8650 [2020-07-21 22:18:00,391 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 22:18:00,397 INFO L225 Difference]: With dead ends: 137 [2020-07-21 22:18:00,397 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 22:18:00,398 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17311 GetRequests, 17248 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 22:18:00,399 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 22:18:00,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 22:18:00,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 22:18:00,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 22:18:00,426 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 8650 [2020-07-21 22:18:00,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 22:18:00,430 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 22:18:00,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 22:18:00,430 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 22:18:02,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18916 [2020-07-21 22:18:02,639 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 22:18:02,645 INFO L422 BasicCegarLoop]: trace histogram [2909, 2909, 1455, 1454, 1454, 1454, 1454, 1454, 1454, 1454, 1454, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 22:18:02,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 22:18:02,846 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 22:18:02,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 22:18:02,852 INFO L82 PathProgramCache]: Analyzing trace with hash -521488683, now seen corresponding path program 12 times [2020-07-21 22:18:02,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 22:18:02,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1002191092] [2020-07-21 22:18:02,853 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 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 22:18:05,788 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 1 check-sat command(s) [2020-07-21 22:18:05,789 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 22:18:05,823 INFO L263 TraceCheckSpWp]: Trace formula consists of 10546 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 22:18:05,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 22:19:56,005 INFO L134 CoverageAnalysis]: Checked inductivity of 22200399 backedges. 21086 proven. 178732 refuted. 0 times theorem prover too weak. 22000581 trivial. 0 not checked. [2020-07-21 22:19:56,006 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 22:20:05,341 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 22:20:11,095 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 22:20:11,197 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 22:20:11,300 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 22:20:11,403 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 22:20:19,731 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 22:20:19,849 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 22:20:19,966 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 22:20:20,087 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 22:20:20,209 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 22:20:20,323 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 22:20:20,430 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 22:21:48,079 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 49