/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 NUM_VARIABLES --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/loop-invgen/nested9.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 17:54:22,600 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 17:54:22,603 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 17:54:22,621 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 17:54:22,621 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 17:54:22,623 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 17:54:22,625 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 17:54:22,638 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 17:54:22,640 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 17:54:22,641 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 17:54:22,643 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 17:54:22,644 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 17:54:22,645 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 17:54:22,648 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 17:54:22,650 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 17:54:22,651 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 17:54:22,653 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 17:54:22,655 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 17:54:22,657 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 17:54:22,663 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 17:54:22,666 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 17:54:22,667 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 17:54:22,668 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 17:54:22,669 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 17:54:22,672 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-20 17:54:22,686 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 17:54:22,687 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 17:54:22,688 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 17:54:22,689 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 [2020-07-20 17:54:22,709 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 17:54:22,709 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 17:54:22,711 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 17:54:22,711 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 17:54:22,712 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 17:54:22,712 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 17:54:22,712 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 17:54:22,712 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 17:54:22,712 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 17:54:22,713 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 17:54:22,714 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 17:54:22,714 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 17:54:22,714 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 17:54:22,714 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 17:54:22,715 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 17:54:22,715 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 17:54:22,715 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 17:54:22,715 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 17:54:22,715 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 17:54:22,716 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 17:54:22,716 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 17:54:22,716 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 17:54:22,716 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 17:54:22,716 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 17:54:22,717 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 17:54:22,717 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 17:54:22,717 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:22,717 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 17:54:22,717 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 17:54:22,718 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 -> NUM_VARIABLES 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 [2020-07-20 17:54:23,023 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 17:54:23,036 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 17:54:23,039 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 17:54:23,040 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 17:54:23,041 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 17:54:23,041 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-20 17:54:23,101 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/97c1e77cc/6a4da3b5ceea44ecb202c369c3628737/FLAGc986e8a12 [2020-07-20 17:54:23,507 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 17:54:23,507 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-invgen/nested9.i [2020-07-20 17:54:23,513 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/97c1e77cc/6a4da3b5ceea44ecb202c369c3628737/FLAGc986e8a12 [2020-07-20 17:54:23,940 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/97c1e77cc/6a4da3b5ceea44ecb202c369c3628737 [2020-07-20 17:54:23,950 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 17:54:23,954 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 17:54:23,955 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 17:54:23,955 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 17:54:23,958 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 17:54:23,959 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:54:23" (1/1) ... [2020-07-20 17:54:23,962 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fd3c9d9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:54:23, skipping insertion in model container [2020-07-20 17:54:23,962 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 05:54:23" (1/1) ... [2020-07-20 17:54:23,970 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 17:54:23,986 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 17:54:24,150 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:54:24,155 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 17:54:24,172 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 17:54:24,187 INFO L208 MainTranslator]: Completed translation [2020-07-20 17:54:24,188 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:54:24 WrapperNode [2020-07-20 17:54:24,188 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 17:54:24,189 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 17:54:24,189 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 17:54:24,189 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 17:54:24,202 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:54:24" (1/1) ... [2020-07-20 17:54:24,202 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:54:24" (1/1) ... [2020-07-20 17:54:24,207 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:54:24" (1/1) ... [2020-07-20 17:54:24,207 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:54:24" (1/1) ... [2020-07-20 17:54:24,211 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:54:24" (1/1) ... [2020-07-20 17:54:24,217 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:54:24" (1/1) ... [2020-07-20 17:54:24,218 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:54:24" (1/1) ... [2020-07-20 17:54:24,297 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 17:54:24,301 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 17:54:24,301 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 17:54:24,301 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 17:54:24,302 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:54:24" (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 [2020-07-20 17:54:24,374 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 17:54:24,374 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 17:54:24,374 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-07-20 17:54:24,374 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-20 17:54:24,375 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 17:54:24,375 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 17:54:24,375 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-07-20 17:54:24,375 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-07-20 17:54:24,376 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-20 17:54:24,376 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 17:54:24,376 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 17:54:24,376 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 17:54:24,376 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 17:54:24,611 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 17:54:24,611 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-07-20 17:54:24,615 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:54:24 BoogieIcfgContainer [2020-07-20 17:54:24,615 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 17:54:24,617 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 17:54:24,617 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 17:54:24,620 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 17:54:24,620 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 05:54:23" (1/3) ... [2020-07-20 17:54:24,621 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e390c89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:54:24, skipping insertion in model container [2020-07-20 17:54:24,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 05:54:24" (2/3) ... [2020-07-20 17:54:24,622 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2e390c89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 05:54:24, skipping insertion in model container [2020-07-20 17:54:24,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 05:54:24" (3/3) ... [2020-07-20 17:54:24,624 INFO L109 eAbstractionObserver]: Analyzing ICFG nested9.i [2020-07-20 17:54:24,635 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 17:54:24,642 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 17:54:24,664 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 17:54:24,693 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 17:54:24,694 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 17:54:24,694 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 17:54:24,694 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 17:54:24,694 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 17:54:24,695 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 17:54:24,695 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 17:54:24,695 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 17:54:24,718 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states. [2020-07-20 17:54:24,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-07-20 17:54:24,725 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:24,726 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:24,727 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:24,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:24,734 INFO L82 PathProgramCache]: Analyzing trace with hash 1671060194, now seen corresponding path program 1 times [2020-07-20 17:54:24,743 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:24,744 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [889959353] [2020-07-20 17:54:24,744 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 [2020-07-20 17:54:24,819 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:54:24,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:24,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-20 17:54:24,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:24,889 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:54:24,889 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:54:24,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [889959353] [2020-07-20 17:54:24,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:54:24,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-07-20 17:54:24,892 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1405379210] [2020-07-20 17:54:24,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-07-20 17:54:24,898 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:24,911 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-07-20 17:54:24,912 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 17:54:24,914 INFO L87 Difference]: Start difference. First operand 29 states. Second operand 4 states. [2020-07-20 17:54:24,983 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:24,984 INFO L93 Difference]: Finished difference Result 53 states and 74 transitions. [2020-07-20 17:54:24,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-07-20 17:54:24,986 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 18 [2020-07-20 17:54:24,986 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:24,995 INFO L225 Difference]: With dead ends: 53 [2020-07-20 17:54:24,995 INFO L226 Difference]: Without dead ends: 27 [2020-07-20 17:54:24,999 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-07-20 17:54:25,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-07-20 17:54:25,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 26. [2020-07-20 17:54:25,039 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 17:54:25,040 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-07-20 17:54:25,042 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2020-07-20 17:54:25,042 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:25,042 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-07-20 17:54:25,043 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-07-20 17:54:25,043 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-07-20 17:54:25,044 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-07-20 17:54:25,044 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:25,044 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:25,258 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:25,258 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:25,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:25,259 INFO L82 PathProgramCache]: Analyzing trace with hash 514965223, now seen corresponding path program 1 times [2020-07-20 17:54:25,260 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:25,261 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1906780767] [2020-07-20 17:54:25,261 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 [2020-07-20 17:54:25,304 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:54:25,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:25,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 17:54:25,311 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:25,373 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:25,389 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:25,454 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2020-07-20 17:54:25,455 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:54:25,455 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1906780767] [2020-07-20 17:54:25,456 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:54:25,456 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-07-20 17:54:25,456 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006449932] [2020-07-20 17:54:25,458 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-20 17:54:25,458 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:25,459 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-20 17:54:25,459 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-07-20 17:54:25,459 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 6 states. [2020-07-20 17:54:25,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:25,579 INFO L93 Difference]: Finished difference Result 46 states and 52 transitions. [2020-07-20 17:54:25,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 17:54:25,580 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 21 [2020-07-20 17:54:25,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:25,582 INFO L225 Difference]: With dead ends: 46 [2020-07-20 17:54:25,582 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 17:54:25,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 17:54:25,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 17:54:25,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2020-07-20 17:54:25,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-07-20 17:54:25,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-07-20 17:54:25,592 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 21 [2020-07-20 17:54:25,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:25,593 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-07-20 17:54:25,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-20 17:54:25,593 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-07-20 17:54:25,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-07-20 17:54:25,594 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:25,595 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:25,808 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:25,809 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:25,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:25,810 INFO L82 PathProgramCache]: Analyzing trace with hash -1134636734, now seen corresponding path program 1 times [2020-07-20 17:54:25,811 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:25,811 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1413865021] [2020-07-20 17:54:25,812 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 [2020-07-20 17:54:25,843 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:54:25,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:25,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 43 conjuncts, 7 conjunts are in the unsatisfiable core [2020-07-20 17:54:25,847 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:25,944 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 17:54:25,945 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 17:54:25,945 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1413865021] [2020-07-20 17:54:25,945 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 17:54:25,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2020-07-20 17:54:25,946 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2140693650] [2020-07-20 17:54:25,947 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-07-20 17:54:25,947 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:25,947 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-07-20 17:54:25,948 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-07-20 17:54:25,948 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 8 states. [2020-07-20 17:54:26,147 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:26,147 INFO L93 Difference]: Finished difference Result 68 states and 80 transitions. [2020-07-20 17:54:26,148 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 17:54:26,148 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 28 [2020-07-20 17:54:26,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:26,154 INFO L225 Difference]: With dead ends: 68 [2020-07-20 17:54:26,156 INFO L226 Difference]: Without dead ends: 49 [2020-07-20 17:54:26,156 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=73, Unknown=0, NotChecked=0, Total=110 [2020-07-20 17:54:26,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-07-20 17:54:26,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 42. [2020-07-20 17:54:26,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-07-20 17:54:26,187 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 48 transitions. [2020-07-20 17:54:26,187 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 48 transitions. Word has length 28 [2020-07-20 17:54:26,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:26,189 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 48 transitions. [2020-07-20 17:54:26,189 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-07-20 17:54:26,189 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 48 transitions. [2020-07-20 17:54:26,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 17:54:26,191 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:26,191 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:26,392 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:26,393 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:26,393 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:26,394 INFO L82 PathProgramCache]: Analyzing trace with hash -670641491, now seen corresponding path program 1 times [2020-07-20 17:54:26,394 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:26,395 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1212205051] [2020-07-20 17:54:26,395 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 [2020-07-20 17:54:26,430 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:54:26,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:26,431 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 17:54:26,434 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:26,520 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:26,526 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:26,564 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 18 proven. 4 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 17:54:26,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:26,590 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:54:26,723 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 11 proven. 11 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2020-07-20 17:54:26,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1212205051] [2020-07-20 17:54:26,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:26,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2020-07-20 17:54:26,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252872683] [2020-07-20 17:54:26,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 17:54:26,726 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:26,726 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 17:54:26,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=174, Unknown=0, NotChecked=0, Total=240 [2020-07-20 17:54:26,728 INFO L87 Difference]: Start difference. First operand 42 states and 48 transitions. Second operand 16 states. [2020-07-20 17:54:27,165 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:27,166 INFO L93 Difference]: Finished difference Result 105 states and 129 transitions. [2020-07-20 17:54:27,166 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-07-20 17:54:27,166 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 41 [2020-07-20 17:54:27,167 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:27,169 INFO L225 Difference]: With dead ends: 105 [2020-07-20 17:54:27,169 INFO L226 Difference]: Without dead ends: 65 [2020-07-20 17:54:27,170 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=249, Invalid=563, Unknown=0, NotChecked=0, Total=812 [2020-07-20 17:54:27,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-07-20 17:54:27,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 55. [2020-07-20 17:54:27,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-07-20 17:54:27,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 63 transitions. [2020-07-20 17:54:27,185 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 63 transitions. Word has length 41 [2020-07-20 17:54:27,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:27,186 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 63 transitions. [2020-07-20 17:54:27,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 17:54:27,186 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 63 transitions. [2020-07-20 17:54:27,188 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-07-20 17:54:27,188 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:27,188 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 5, 5, 5, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:27,401 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:27,402 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:27,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:27,403 INFO L82 PathProgramCache]: Analyzing trace with hash 1941695900, now seen corresponding path program 2 times [2020-07-20 17:54:27,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:27,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [581134077] [2020-07-20 17:54:27,404 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 [2020-07-20 17:54:27,447 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:54:27,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:27,451 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 17:54:27,454 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:27,589 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 63 proven. 16 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2020-07-20 17:54:27,589 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:27,709 INFO L134 CoverageAnalysis]: Checked inductivity of 106 backedges. 42 proven. 17 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2020-07-20 17:54:27,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [581134077] [2020-07-20 17:54:27,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:27,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-20 17:54:27,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [231967398] [2020-07-20 17:54:27,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 17:54:27,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:27,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 17:54:27,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2020-07-20 17:54:27,713 INFO L87 Difference]: Start difference. First operand 55 states and 63 transitions. Second operand 15 states. [2020-07-20 17:54:28,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:28,224 INFO L93 Difference]: Finished difference Result 131 states and 165 transitions. [2020-07-20 17:54:28,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-07-20 17:54:28,224 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 62 [2020-07-20 17:54:28,225 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:28,226 INFO L225 Difference]: With dead ends: 131 [2020-07-20 17:54:28,226 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 17:54:28,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 137 GetRequests, 107 SyntacticMatches, 3 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=209, Invalid=603, Unknown=0, NotChecked=0, Total=812 [2020-07-20 17:54:28,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 17:54:28,242 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 65. [2020-07-20 17:54:28,243 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-07-20 17:54:28,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 75 transitions. [2020-07-20 17:54:28,244 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 75 transitions. Word has length 62 [2020-07-20 17:54:28,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:28,245 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 75 transitions. [2020-07-20 17:54:28,245 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 17:54:28,245 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 75 transitions. [2020-07-20 17:54:28,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-07-20 17:54:28,247 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:28,247 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 7, 7, 7, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:28,462 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:28,463 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:28,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:28,464 INFO L82 PathProgramCache]: Analyzing trace with hash 1833574291, now seen corresponding path program 3 times [2020-07-20 17:54:28,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:28,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1817453840] [2020-07-20 17:54:28,465 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 [2020-07-20 17:54:28,517 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:28,518 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:28,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:54:28,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:28,678 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 78 proven. 59 refuted. 0 times theorem prover too weak. 70 trivial. 0 not checked. [2020-07-20 17:54:28,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:28,849 INFO L134 CoverageAnalysis]: Checked inductivity of 207 backedges. 55 proven. 60 refuted. 0 times theorem prover too weak. 92 trivial. 0 not checked. [2020-07-20 17:54:28,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1817453840] [2020-07-20 17:54:28,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:28,857 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2020-07-20 17:54:28,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895495674] [2020-07-20 17:54:28,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 17:54:28,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:28,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 17:54:28,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=271, Unknown=0, NotChecked=0, Total=342 [2020-07-20 17:54:28,859 INFO L87 Difference]: Start difference. First operand 65 states and 75 transitions. Second operand 19 states. [2020-07-20 17:54:29,684 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:29,684 INFO L93 Difference]: Finished difference Result 139 states and 173 transitions. [2020-07-20 17:54:29,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-07-20 17:54:29,691 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 79 [2020-07-20 17:54:29,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:29,695 INFO L225 Difference]: With dead ends: 139 [2020-07-20 17:54:29,695 INFO L226 Difference]: Without dead ends: 106 [2020-07-20 17:54:29,698 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 137 SyntacticMatches, 3 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 318 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=353, Invalid=1053, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 17:54:29,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-07-20 17:54:29,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 79. [2020-07-20 17:54:29,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-07-20 17:54:29,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 95 transitions. [2020-07-20 17:54:29,728 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 95 transitions. Word has length 79 [2020-07-20 17:54:29,730 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:29,730 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 95 transitions. [2020-07-20 17:54:29,730 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 17:54:29,730 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 95 transitions. [2020-07-20 17:54:29,735 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2020-07-20 17:54:29,736 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:29,736 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 10, 9, 9, 9, 9, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:29,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:29,950 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:29,951 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:29,951 INFO L82 PathProgramCache]: Analyzing trace with hash -832577267, now seen corresponding path program 4 times [2020-07-20 17:54:29,952 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:29,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [262874244] [2020-07-20 17:54:29,953 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 [2020-07-20 17:54:29,991 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:54:29,992 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:29,992 INFO L263 TraceCheckSpWp]: Trace formula consists of 127 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 17:54:29,996 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:30,108 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 215 proven. 33 refuted. 0 times theorem prover too weak. 106 trivial. 0 not checked. [2020-07-20 17:54:30,108 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:30,262 INFO L134 CoverageAnalysis]: Checked inductivity of 354 backedges. 131 proven. 45 refuted. 0 times theorem prover too weak. 178 trivial. 0 not checked. [2020-07-20 17:54:30,262 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [262874244] [2020-07-20 17:54:30,262 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:30,262 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 16 [2020-07-20 17:54:30,263 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137943099] [2020-07-20 17:54:30,263 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-07-20 17:54:30,263 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:30,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-07-20 17:54:30,264 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=177, Unknown=0, NotChecked=0, Total=240 [2020-07-20 17:54:30,264 INFO L87 Difference]: Start difference. First operand 79 states and 95 transitions. Second operand 16 states. [2020-07-20 17:54:30,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:30,584 INFO L93 Difference]: Finished difference Result 163 states and 204 transitions. [2020-07-20 17:54:30,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 17:54:30,585 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 99 [2020-07-20 17:54:30,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:30,587 INFO L225 Difference]: With dead ends: 163 [2020-07-20 17:54:30,587 INFO L226 Difference]: Without dead ends: 96 [2020-07-20 17:54:30,589 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 182 SyntacticMatches, 2 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 103 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=203, Invalid=447, Unknown=0, NotChecked=0, Total=650 [2020-07-20 17:54:30,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-07-20 17:54:30,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 86. [2020-07-20 17:54:30,611 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-07-20 17:54:30,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 102 transitions. [2020-07-20 17:54:30,616 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 102 transitions. Word has length 99 [2020-07-20 17:54:30,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:30,617 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 102 transitions. [2020-07-20 17:54:30,617 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-07-20 17:54:30,617 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 102 transitions. [2020-07-20 17:54:30,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-07-20 17:54:30,622 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:30,622 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 11, 10, 10, 10, 10, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:30,823 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:30,824 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:30,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:30,824 INFO L82 PathProgramCache]: Analyzing trace with hash -1419871984, now seen corresponding path program 5 times [2020-07-20 17:54:30,825 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:30,825 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1410942550] [2020-07-20 17:54:30,826 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 [2020-07-20 17:54:30,875 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:30,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:30,877 INFO L263 TraceCheckSpWp]: Trace formula consists of 181 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:54:30,880 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:31,032 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 110 proven. 120 refuted. 0 times theorem prover too weak. 194 trivial. 0 not checked. [2020-07-20 17:54:31,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:31,184 INFO L134 CoverageAnalysis]: Checked inductivity of 424 backedges. 75 proven. 121 refuted. 0 times theorem prover too weak. 228 trivial. 0 not checked. [2020-07-20 17:54:31,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1410942550] [2020-07-20 17:54:31,186 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:31,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-20 17:54:31,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600678584] [2020-07-20 17:54:31,187 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 17:54:31,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:31,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 17:54:31,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=67, Invalid=239, Unknown=0, NotChecked=0, Total=306 [2020-07-20 17:54:31,189 INFO L87 Difference]: Start difference. First operand 86 states and 102 transitions. Second operand 18 states. [2020-07-20 17:54:32,166 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:32,166 INFO L93 Difference]: Finished difference Result 168 states and 210 transitions. [2020-07-20 17:54:32,167 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-07-20 17:54:32,167 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 106 [2020-07-20 17:54:32,168 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:32,170 INFO L225 Difference]: With dead ends: 168 [2020-07-20 17:54:32,170 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 17:54:32,171 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 191 SyntacticMatches, 4 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 517 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=472, Invalid=1508, Unknown=0, NotChecked=0, Total=1980 [2020-07-20 17:54:32,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 17:54:32,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 99. [2020-07-20 17:54:32,188 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-07-20 17:54:32,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 119 transitions. [2020-07-20 17:54:32,189 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 119 transitions. Word has length 106 [2020-07-20 17:54:32,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:32,190 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 119 transitions. [2020-07-20 17:54:32,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 17:54:32,190 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 119 transitions. [2020-07-20 17:54:32,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2020-07-20 17:54:32,192 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:32,192 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 13, 12, 12, 12, 12, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:32,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:32,399 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:32,400 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:32,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1976134303, now seen corresponding path program 6 times [2020-07-20 17:54:32,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:32,401 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1587154625] [2020-07-20 17:54:32,401 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 [2020-07-20 17:54:32,443 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:54:32,444 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:32,445 INFO L263 TraceCheckSpWp]: Trace formula consists of 155 conjuncts, 9 conjunts are in the unsatisfiable core [2020-07-20 17:54:32,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:32,567 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 334 proven. 60 refuted. 0 times theorem prover too weak. 217 trivial. 0 not checked. [2020-07-20 17:54:32,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:32,713 INFO L134 CoverageAnalysis]: Checked inductivity of 611 backedges. 214 proven. 60 refuted. 0 times theorem prover too weak. 337 trivial. 0 not checked. [2020-07-20 17:54:32,713 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1587154625] [2020-07-20 17:54:32,714 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:32,714 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10] total 15 [2020-07-20 17:54:32,714 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803144353] [2020-07-20 17:54:32,715 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 17:54:32,715 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:32,715 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 17:54:32,716 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2020-07-20 17:54:32,716 INFO L87 Difference]: Start difference. First operand 99 states and 119 transitions. Second operand 15 states. [2020-07-20 17:54:33,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:33,179 INFO L93 Difference]: Finished difference Result 186 states and 227 transitions. [2020-07-20 17:54:33,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-07-20 17:54:33,180 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 123 [2020-07-20 17:54:33,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:33,181 INFO L225 Difference]: With dead ends: 186 [2020-07-20 17:54:33,181 INFO L226 Difference]: Without dead ends: 99 [2020-07-20 17:54:33,183 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 261 GetRequests, 232 SyntacticMatches, 3 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 109 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=240, Invalid=516, Unknown=0, NotChecked=0, Total=756 [2020-07-20 17:54:33,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2020-07-20 17:54:33,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 92. [2020-07-20 17:54:33,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-07-20 17:54:33,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 107 transitions. [2020-07-20 17:54:33,197 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 107 transitions. Word has length 123 [2020-07-20 17:54:33,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:33,197 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 107 transitions. [2020-07-20 17:54:33,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 17:54:33,197 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 107 transitions. [2020-07-20 17:54:33,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-07-20 17:54:33,199 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:33,199 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 14, 13, 13, 13, 13, 5, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:33,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:33,407 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:33,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:33,408 INFO L82 PathProgramCache]: Analyzing trace with hash -1688384554, now seen corresponding path program 7 times [2020-07-20 17:54:33,408 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:33,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [271401225] [2020-07-20 17:54:33,409 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 [2020-07-20 17:54:33,457 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:33,457 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:33,459 INFO L263 TraceCheckSpWp]: Trace formula consists of 217 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 17:54:33,462 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:33,634 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 65 proven. 267 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-20 17:54:33,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:33,837 INFO L134 CoverageAnalysis]: Checked inductivity of 703 backedges. 64 proven. 268 refuted. 0 times theorem prover too weak. 371 trivial. 0 not checked. [2020-07-20 17:54:33,838 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [271401225] [2020-07-20 17:54:33,838 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:33,838 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-20 17:54:33,838 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1466345453] [2020-07-20 17:54:33,839 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 17:54:33,839 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:33,839 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 17:54:33,839 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=369, Unknown=0, NotChecked=0, Total=462 [2020-07-20 17:54:33,840 INFO L87 Difference]: Start difference. First operand 92 states and 107 transitions. Second operand 22 states. [2020-07-20 17:54:35,321 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:35,321 INFO L93 Difference]: Finished difference Result 184 states and 228 transitions. [2020-07-20 17:54:35,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-07-20 17:54:35,322 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 130 [2020-07-20 17:54:35,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:35,324 INFO L225 Difference]: With dead ends: 184 [2020-07-20 17:54:35,324 INFO L226 Difference]: Without dead ends: 141 [2020-07-20 17:54:35,326 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 293 GetRequests, 235 SyntacticMatches, 4 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 834 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=721, Invalid=2359, Unknown=0, NotChecked=0, Total=3080 [2020-07-20 17:54:35,326 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 141 states. [2020-07-20 17:54:35,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 141 to 107. [2020-07-20 17:54:35,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-07-20 17:54:35,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 127 transitions. [2020-07-20 17:54:35,341 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 127 transitions. Word has length 130 [2020-07-20 17:54:35,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:35,342 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 127 transitions. [2020-07-20 17:54:35,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 17:54:35,342 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 127 transitions. [2020-07-20 17:54:35,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2020-07-20 17:54:35,344 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:35,344 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 17, 16, 16, 16, 16, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:35,559 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:35,560 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:35,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:35,561 INFO L82 PathProgramCache]: Analyzing trace with hash -840848228, now seen corresponding path program 8 times [2020-07-20 17:54:35,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:35,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [470257812] [2020-07-20 17:54:35,562 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 [2020-07-20 17:54:35,614 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:35,614 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:35,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 253 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:54:35,619 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:35,784 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 551 proven. 122 refuted. 0 times theorem prover too weak. 381 trivial. 0 not checked. [2020-07-20 17:54:35,784 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:35,974 INFO L134 CoverageAnalysis]: Checked inductivity of 1054 backedges. 288 proven. 201 refuted. 0 times theorem prover too weak. 565 trivial. 0 not checked. [2020-07-20 17:54:35,975 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [470257812] [2020-07-20 17:54:35,975 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:35,975 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 19 [2020-07-20 17:54:35,975 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1318561708] [2020-07-20 17:54:35,976 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 17:54:35,976 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:35,976 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 17:54:35,977 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=85, Invalid=257, Unknown=0, NotChecked=0, Total=342 [2020-07-20 17:54:35,977 INFO L87 Difference]: Start difference. First operand 107 states and 127 transitions. Second operand 19 states. [2020-07-20 17:54:36,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:36,795 INFO L93 Difference]: Finished difference Result 206 states and 253 transitions. [2020-07-20 17:54:36,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-07-20 17:54:36,796 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 154 [2020-07-20 17:54:36,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:36,798 INFO L225 Difference]: With dead ends: 206 [2020-07-20 17:54:36,798 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 17:54:36,800 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 290 SyntacticMatches, 3 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 289 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=537, Invalid=1185, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 17:54:36,800 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 17:54:36,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2020-07-20 17:54:36,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-07-20 17:54:36,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 138 transitions. [2020-07-20 17:54:36,817 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 138 transitions. Word has length 154 [2020-07-20 17:54:36,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:36,817 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 138 transitions. [2020-07-20 17:54:36,817 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 17:54:36,817 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 138 transitions. [2020-07-20 17:54:36,819 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 162 [2020-07-20 17:54:36,819 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:36,819 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 18, 17, 17, 17, 17, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:37,032 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:37,033 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:37,033 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:37,034 INFO L82 PathProgramCache]: Analyzing trace with hash 1311982393, now seen corresponding path program 9 times [2020-07-20 17:54:37,034 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:37,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99727594] [2020-07-20 17:54:37,035 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 [2020-07-20 17:54:37,108 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:54:37,109 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:37,110 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 17:54:37,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:37,256 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:37,258 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:54:37,304 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 469 proven. 33 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-20 17:54:37,304 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:37,321 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:54:37,552 INFO L134 CoverageAnalysis]: Checked inductivity of 1175 backedges. 83 proven. 419 refuted. 0 times theorem prover too weak. 673 trivial. 0 not checked. [2020-07-20 17:54:37,552 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99727594] [2020-07-20 17:54:37,553 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:37,553 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2020-07-20 17:54:37,553 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1732674591] [2020-07-20 17:54:37,553 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 17:54:37,554 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:37,554 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 17:54:37,554 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=355, Unknown=0, NotChecked=0, Total=506 [2020-07-20 17:54:37,555 INFO L87 Difference]: Start difference. First operand 117 states and 138 transitions. Second operand 23 states. [2020-07-20 17:54:38,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:38,385 INFO L93 Difference]: Finished difference Result 165 states and 201 transitions. [2020-07-20 17:54:38,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-07-20 17:54:38,386 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 161 [2020-07-20 17:54:38,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:38,389 INFO L225 Difference]: With dead ends: 165 [2020-07-20 17:54:38,389 INFO L226 Difference]: Without dead ends: 163 [2020-07-20 17:54:38,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 357 GetRequests, 307 SyntacticMatches, 3 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=725, Invalid=1627, Unknown=0, NotChecked=0, Total=2352 [2020-07-20 17:54:38,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 163 states. [2020-07-20 17:54:38,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 163 to 136. [2020-07-20 17:54:38,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 136 states. [2020-07-20 17:54:38,408 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 166 transitions. [2020-07-20 17:54:38,408 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 166 transitions. Word has length 161 [2020-07-20 17:54:38,409 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:38,409 INFO L479 AbstractCegarLoop]: Abstraction has 136 states and 166 transitions. [2020-07-20 17:54:38,409 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 17:54:38,409 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 166 transitions. [2020-07-20 17:54:38,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 197 [2020-07-20 17:54:38,412 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:38,412 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 23, 22, 22, 22, 22, 6, 5, 5, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:38,626 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:38,627 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:38,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:38,628 INFO L82 PathProgramCache]: Analyzing trace with hash -90659728, now seen corresponding path program 10 times [2020-07-20 17:54:38,628 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:38,628 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [623793098] [2020-07-20 17:54:38,629 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 [2020-07-20 17:54:38,695 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:38,695 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:38,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 313 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 17:54:38,701 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:38,922 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 621 proven. 517 refuted. 0 times theorem prover too weak. 747 trivial. 0 not checked. [2020-07-20 17:54:38,922 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:39,227 INFO L134 CoverageAnalysis]: Checked inductivity of 1885 backedges. 340 proven. 518 refuted. 0 times theorem prover too weak. 1027 trivial. 0 not checked. [2020-07-20 17:54:39,228 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [623793098] [2020-07-20 17:54:39,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:39,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2020-07-20 17:54:39,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019851806] [2020-07-20 17:54:39,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 17:54:39,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:39,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 17:54:39,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=525, Unknown=0, NotChecked=0, Total=650 [2020-07-20 17:54:39,230 INFO L87 Difference]: Start difference. First operand 136 states and 166 transitions. Second operand 26 states. [2020-07-20 17:54:41,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:41,162 INFO L93 Difference]: Finished difference Result 278 states and 359 transitions. [2020-07-20 17:54:41,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-07-20 17:54:41,162 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 196 [2020-07-20 17:54:41,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:41,164 INFO L225 Difference]: With dead ends: 278 [2020-07-20 17:54:41,164 INFO L226 Difference]: Without dead ends: 206 [2020-07-20 17:54:41,166 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 431 GetRequests, 363 SyntacticMatches, 4 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1191 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1034, Invalid=3256, Unknown=0, NotChecked=0, Total=4290 [2020-07-20 17:54:41,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-07-20 17:54:41,190 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 156. [2020-07-20 17:54:41,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 156 states. [2020-07-20 17:54:41,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 194 transitions. [2020-07-20 17:54:41,191 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 194 transitions. Word has length 196 [2020-07-20 17:54:41,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:41,192 INFO L479 AbstractCegarLoop]: Abstraction has 156 states and 194 transitions. [2020-07-20 17:54:41,192 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 17:54:41,192 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 194 transitions. [2020-07-20 17:54:41,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 231 [2020-07-20 17:54:41,194 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:41,195 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 27, 26, 26, 26, 26, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:41,407 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:41,408 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:41,408 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:41,409 INFO L82 PathProgramCache]: Analyzing trace with hash -1782452330, now seen corresponding path program 11 times [2020-07-20 17:54:41,409 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:41,409 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1012527198] [2020-07-20 17:54:41,410 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 [2020-07-20 17:54:41,474 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:54:41,475 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:41,476 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 17:54:41,479 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:41,677 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 1508 proven. 220 refuted. 0 times theorem prover too weak. 914 trivial. 0 not checked. [2020-07-20 17:54:41,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:41,968 INFO L134 CoverageAnalysis]: Checked inductivity of 2642 backedges. 735 proven. 399 refuted. 0 times theorem prover too weak. 1508 trivial. 0 not checked. [2020-07-20 17:54:41,968 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1012527198] [2020-07-20 17:54:41,968 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:41,969 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2020-07-20 17:54:41,969 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1469582705] [2020-07-20 17:54:41,969 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 17:54:41,969 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:41,970 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 17:54:41,970 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=386, Unknown=0, NotChecked=0, Total=506 [2020-07-20 17:54:41,970 INFO L87 Difference]: Start difference. First operand 156 states and 194 transitions. Second operand 23 states. [2020-07-20 17:54:42,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:42,996 INFO L93 Difference]: Finished difference Result 289 states and 381 transitions. [2020-07-20 17:54:42,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-07-20 17:54:42,997 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 230 [2020-07-20 17:54:42,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:43,000 INFO L225 Difference]: With dead ends: 289 [2020-07-20 17:54:43,000 INFO L226 Difference]: Without dead ends: 209 [2020-07-20 17:54:43,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 438 SyntacticMatches, 3 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 422 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=658, Invalid=1598, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 17:54:43,002 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2020-07-20 17:54:43,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 190. [2020-07-20 17:54:43,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 190 states. [2020-07-20 17:54:43,031 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 190 states to 190 states and 245 transitions. [2020-07-20 17:54:43,031 INFO L78 Accepts]: Start accepts. Automaton has 190 states and 245 transitions. Word has length 230 [2020-07-20 17:54:43,032 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:43,032 INFO L479 AbstractCegarLoop]: Abstraction has 190 states and 245 transitions. [2020-07-20 17:54:43,032 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 17:54:43,032 INFO L276 IsEmpty]: Start isEmpty. Operand 190 states and 245 transitions. [2020-07-20 17:54:43,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2020-07-20 17:54:43,034 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:43,034 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 28, 27, 27, 27, 27, 7, 6, 6, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:43,242 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:43,243 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:43,243 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:43,244 INFO L82 PathProgramCache]: Analyzing trace with hash -1051553665, now seen corresponding path program 12 times [2020-07-20 17:54:43,244 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:43,244 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1507180480] [2020-07-20 17:54:43,245 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 [2020-07-20 17:54:43,313 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:43,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:43,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 17:54:43,318 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:43,514 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 898 proven. 634 refuted. 0 times theorem prover too weak. 1302 trivial. 0 not checked. [2020-07-20 17:54:43,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:43,770 INFO L134 CoverageAnalysis]: Checked inductivity of 2834 backedges. 467 proven. 635 refuted. 0 times theorem prover too weak. 1732 trivial. 0 not checked. [2020-07-20 17:54:43,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1507180480] [2020-07-20 17:54:43,770 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:43,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-07-20 17:54:43,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1351563440] [2020-07-20 17:54:43,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 17:54:43,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:43,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 17:54:43,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2020-07-20 17:54:43,772 INFO L87 Difference]: Start difference. First operand 190 states and 245 transitions. Second operand 21 states. [2020-07-20 17:54:45,233 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:45,234 INFO L93 Difference]: Finished difference Result 447 states and 593 transitions. [2020-07-20 17:54:45,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-07-20 17:54:45,234 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 237 [2020-07-20 17:54:45,237 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:45,240 INFO L225 Difference]: With dead ends: 447 [2020-07-20 17:54:45,240 INFO L226 Difference]: Without dead ends: 351 [2020-07-20 17:54:45,244 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 514 GetRequests, 449 SyntacticMatches, 5 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1151 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=850, Invalid=2932, Unknown=0, NotChecked=0, Total=3782 [2020-07-20 17:54:45,244 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 351 states. [2020-07-20 17:54:45,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 351 to 254. [2020-07-20 17:54:45,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 254 states. [2020-07-20 17:54:45,290 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 254 states to 254 states and 328 transitions. [2020-07-20 17:54:45,291 INFO L78 Accepts]: Start accepts. Automaton has 254 states and 328 transitions. Word has length 237 [2020-07-20 17:54:45,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:45,291 INFO L479 AbstractCegarLoop]: Abstraction has 254 states and 328 transitions. [2020-07-20 17:54:45,291 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 17:54:45,292 INFO L276 IsEmpty]: Start isEmpty. Operand 254 states and 328 transitions. [2020-07-20 17:54:45,294 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 262 [2020-07-20 17:54:45,294 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:45,294 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 31, 30, 30, 30, 30, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:45,507 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:45,508 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:45,508 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:45,509 INFO L82 PathProgramCache]: Analyzing trace with hash 1090659833, now seen corresponding path program 13 times [2020-07-20 17:54:45,509 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:45,509 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [471882482] [2020-07-20 17:54:45,510 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 [2020-07-20 17:54:45,579 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 17:54:45,579 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:45,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-20 17:54:45,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:45,732 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1861 proven. 224 refuted. 0 times theorem prover too weak. 1421 trivial. 0 not checked. [2020-07-20 17:54:45,732 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:45,983 INFO L134 CoverageAnalysis]: Checked inductivity of 3506 backedges. 1123 proven. 224 refuted. 0 times theorem prover too weak. 2159 trivial. 0 not checked. [2020-07-20 17:54:45,983 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [471882482] [2020-07-20 17:54:45,983 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:45,984 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12] total 18 [2020-07-20 17:54:45,984 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1660919894] [2020-07-20 17:54:45,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-07-20 17:54:45,985 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:45,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-07-20 17:54:45,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=78, Invalid=228, Unknown=0, NotChecked=0, Total=306 [2020-07-20 17:54:45,985 INFO L87 Difference]: Start difference. First operand 254 states and 328 transitions. Second operand 18 states. [2020-07-20 17:54:46,679 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:46,679 INFO L93 Difference]: Finished difference Result 363 states and 475 transitions. [2020-07-20 17:54:46,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-07-20 17:54:46,679 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 261 [2020-07-20 17:54:46,680 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:46,681 INFO L225 Difference]: With dead ends: 363 [2020-07-20 17:54:46,681 INFO L226 Difference]: Without dead ends: 206 [2020-07-20 17:54:46,683 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 545 GetRequests, 505 SyntacticMatches, 4 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 226 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=429, Invalid=977, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 17:54:46,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2020-07-20 17:54:46,709 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 206. [2020-07-20 17:54:46,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 206 states. [2020-07-20 17:54:46,711 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 206 states to 206 states and 263 transitions. [2020-07-20 17:54:46,711 INFO L78 Accepts]: Start accepts. Automaton has 206 states and 263 transitions. Word has length 261 [2020-07-20 17:54:46,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:46,712 INFO L479 AbstractCegarLoop]: Abstraction has 206 states and 263 transitions. [2020-07-20 17:54:46,712 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-07-20 17:54:46,712 INFO L276 IsEmpty]: Start isEmpty. Operand 206 states and 263 transitions. [2020-07-20 17:54:46,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2020-07-20 17:54:46,714 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:46,714 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 32, 31, 31, 31, 31, 8, 7, 7, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:46,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:46,929 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:46,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:46,929 INFO L82 PathProgramCache]: Analyzing trace with hash -431748828, now seen corresponding path program 14 times [2020-07-20 17:54:46,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:46,930 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [245021172] [2020-07-20 17:54:46,930 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 [2020-07-20 17:54:47,009 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:47,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:47,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 17:54:47,014 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:47,269 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 909 proven. 1045 refuted. 0 times theorem prover too weak. 1773 trivial. 0 not checked. [2020-07-20 17:54:47,269 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:47,639 INFO L134 CoverageAnalysis]: Checked inductivity of 3727 backedges. 484 proven. 1046 refuted. 0 times theorem prover too weak. 2197 trivial. 0 not checked. [2020-07-20 17:54:47,642 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [245021172] [2020-07-20 17:54:47,646 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:47,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 25 [2020-07-20 17:54:47,647 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [503026418] [2020-07-20 17:54:47,647 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 17:54:47,648 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:47,648 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 17:54:47,648 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=119, Invalid=481, Unknown=0, NotChecked=0, Total=600 [2020-07-20 17:54:47,648 INFO L87 Difference]: Start difference. First operand 206 states and 263 transitions. Second operand 25 states. [2020-07-20 17:54:50,306 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:50,307 INFO L93 Difference]: Finished difference Result 364 states and 481 transitions. [2020-07-20 17:54:50,307 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2020-07-20 17:54:50,307 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 268 [2020-07-20 17:54:50,308 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:50,310 INFO L225 Difference]: With dead ends: 364 [2020-07-20 17:54:50,310 INFO L226 Difference]: Without dead ends: 258 [2020-07-20 17:54:50,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 591 GetRequests, 507 SyntacticMatches, 5 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2058 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1434, Invalid=5046, Unknown=0, NotChecked=0, Total=6480 [2020-07-20 17:54:50,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 258 states. [2020-07-20 17:54:50,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 258 to 224. [2020-07-20 17:54:50,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 224 states. [2020-07-20 17:54:50,359 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 287 transitions. [2020-07-20 17:54:50,359 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 287 transitions. Word has length 268 [2020-07-20 17:54:50,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:50,360 INFO L479 AbstractCegarLoop]: Abstraction has 224 states and 287 transitions. [2020-07-20 17:54:50,360 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 17:54:50,360 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 287 transitions. [2020-07-20 17:54:50,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 17:54:50,364 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:50,364 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 36, 35, 35, 35, 35, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:50,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:50,579 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:50,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:50,579 INFO L82 PathProgramCache]: Analyzing trace with hash -935543841, now seen corresponding path program 15 times [2020-07-20 17:54:50,579 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:50,579 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1568410077] [2020-07-20 17:54:50,580 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 [2020-07-20 17:54:50,660 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:50,660 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:50,661 INFO L263 TraceCheckSpWp]: Trace formula consists of 468 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 17:54:50,665 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:50,895 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 2489 proven. 351 refuted. 0 times theorem prover too weak. 1903 trivial. 0 not checked. [2020-07-20 17:54:50,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:51,218 INFO L134 CoverageAnalysis]: Checked inductivity of 4743 backedges. 1293 proven. 629 refuted. 0 times theorem prover too weak. 2821 trivial. 0 not checked. [2020-07-20 17:54:51,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1568410077] [2020-07-20 17:54:51,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:51,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 22 [2020-07-20 17:54:51,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733106841] [2020-07-20 17:54:51,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-07-20 17:54:51,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:51,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-07-20 17:54:51,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=351, Unknown=0, NotChecked=0, Total=462 [2020-07-20 17:54:51,221 INFO L87 Difference]: Start difference. First operand 224 states and 287 transitions. Second operand 22 states. [2020-07-20 17:54:52,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:52,454 INFO L93 Difference]: Finished difference Result 320 states and 417 transitions. [2020-07-20 17:54:52,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-07-20 17:54:52,460 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 299 [2020-07-20 17:54:52,460 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:52,462 INFO L225 Difference]: With dead ends: 320 [2020-07-20 17:54:52,462 INFO L226 Difference]: Without dead ends: 224 [2020-07-20 17:54:52,464 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 633 GetRequests, 577 SyntacticMatches, 4 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 541 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=837, Invalid=2025, Unknown=0, NotChecked=0, Total=2862 [2020-07-20 17:54:52,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2020-07-20 17:54:52,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 193. [2020-07-20 17:54:52,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 193 states. [2020-07-20 17:54:52,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 238 transitions. [2020-07-20 17:54:52,498 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 238 transitions. Word has length 299 [2020-07-20 17:54:52,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:52,499 INFO L479 AbstractCegarLoop]: Abstraction has 193 states and 238 transitions. [2020-07-20 17:54:52,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-07-20 17:54:52,499 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 238 transitions. [2020-07-20 17:54:52,501 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2020-07-20 17:54:52,501 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:52,501 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 37, 36, 36, 36, 36, 9, 8, 8, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:52,715 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:52,716 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:52,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:52,717 INFO L82 PathProgramCache]: Analyzing trace with hash 221652094, now seen corresponding path program 16 times [2020-07-20 17:54:52,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:52,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1314188492] [2020-07-20 17:54:52,718 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 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 [2020-07-20 17:54:52,854 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:52,855 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:52,857 INFO L263 TraceCheckSpWp]: Trace formula consists of 479 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 17:54:52,877 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:53,326 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 875 proven. 1633 refuted. 0 times theorem prover too weak. 2492 trivial. 0 not checked. [2020-07-20 17:54:53,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:53,743 INFO L134 CoverageAnalysis]: Checked inductivity of 5000 backedges. 484 proven. 1634 refuted. 0 times theorem prover too weak. 2882 trivial. 0 not checked. [2020-07-20 17:54:53,744 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1314188492] [2020-07-20 17:54:53,744 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:53,744 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 29 [2020-07-20 17:54:53,744 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314197157] [2020-07-20 17:54:53,745 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 17:54:53,745 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:53,745 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 17:54:53,746 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=658, Unknown=0, NotChecked=0, Total=812 [2020-07-20 17:54:53,746 INFO L87 Difference]: Start difference. First operand 193 states and 238 transitions. Second operand 29 states. [2020-07-20 17:54:57,180 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:54:57,180 INFO L93 Difference]: Finished difference Result 343 states and 444 transitions. [2020-07-20 17:54:57,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 71 states. [2020-07-20 17:54:57,181 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 306 [2020-07-20 17:54:57,181 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:54:57,183 INFO L225 Difference]: With dead ends: 343 [2020-07-20 17:54:57,183 INFO L226 Difference]: Without dead ends: 265 [2020-07-20 17:54:57,187 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 675 GetRequests, 579 SyntacticMatches, 5 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2751 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=1903, Invalid=6653, Unknown=0, NotChecked=0, Total=8556 [2020-07-20 17:54:57,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 265 states. [2020-07-20 17:54:57,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 265 to 214. [2020-07-20 17:54:57,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 214 states. [2020-07-20 17:54:57,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 214 states to 214 states and 266 transitions. [2020-07-20 17:54:57,238 INFO L78 Accepts]: Start accepts. Automaton has 214 states and 266 transitions. Word has length 306 [2020-07-20 17:54:57,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:54:57,239 INFO L479 AbstractCegarLoop]: Abstraction has 214 states and 266 transitions. [2020-07-20 17:54:57,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 17:54:57,239 INFO L276 IsEmpty]: Start isEmpty. Operand 214 states and 266 transitions. [2020-07-20 17:54:57,241 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 345 [2020-07-20 17:54:57,241 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:54:57,242 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 42, 41, 41, 41, 41, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:54:57,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:54:57,455 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:54:57,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:54:57,456 INFO L82 PathProgramCache]: Analyzing trace with hash 856878168, now seen corresponding path program 17 times [2020-07-20 17:54:57,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:54:57,457 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [977313041] [2020-07-20 17:54:57,457 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 [2020-07-20 17:54:57,555 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:54:57,555 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:54:57,556 INFO L263 TraceCheckSpWp]: Trace formula consists of 534 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 17:54:57,562 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:54:57,848 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 3316 proven. 523 refuted. 0 times theorem prover too weak. 2622 trivial. 0 not checked. [2020-07-20 17:54:57,848 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:54:58,292 INFO L134 CoverageAnalysis]: Checked inductivity of 6461 backedges. 1566 proven. 1139 refuted. 0 times theorem prover too weak. 3756 trivial. 0 not checked. [2020-07-20 17:54:58,292 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [977313041] [2020-07-20 17:54:58,292 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:54:58,292 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 26 [2020-07-20 17:54:58,293 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1290225022] [2020-07-20 17:54:58,293 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-07-20 17:54:58,293 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:54:58,294 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-07-20 17:54:58,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=500, Unknown=0, NotChecked=0, Total=650 [2020-07-20 17:54:58,294 INFO L87 Difference]: Start difference. First operand 214 states and 266 transitions. Second operand 26 states. [2020-07-20 17:55:00,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:00,270 INFO L93 Difference]: Finished difference Result 416 states and 539 transitions. [2020-07-20 17:55:00,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-07-20 17:55:00,271 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 344 [2020-07-20 17:55:00,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:00,273 INFO L225 Difference]: With dead ends: 416 [2020-07-20 17:55:00,273 INFO L226 Difference]: Without dead ends: 262 [2020-07-20 17:55:00,276 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 737 GetRequests, 663 SyntacticMatches, 4 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1082 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1502, Invalid=3610, Unknown=0, NotChecked=0, Total=5112 [2020-07-20 17:55:00,276 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 262 states. [2020-07-20 17:55:00,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 262 to 248. [2020-07-20 17:55:00,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 248 states. [2020-07-20 17:55:00,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 248 states to 248 states and 315 transitions. [2020-07-20 17:55:00,325 INFO L78 Accepts]: Start accepts. Automaton has 248 states and 315 transitions. Word has length 344 [2020-07-20 17:55:00,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:00,326 INFO L479 AbstractCegarLoop]: Abstraction has 248 states and 315 transitions. [2020-07-20 17:55:00,326 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-07-20 17:55:00,327 INFO L276 IsEmpty]: Start isEmpty. Operand 248 states and 315 transitions. [2020-07-20 17:55:00,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 352 [2020-07-20 17:55:00,331 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:00,331 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 43, 42, 42, 42, 42, 10, 9, 9, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:00,546 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:00,547 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:00,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:00,547 INFO L82 PathProgramCache]: Analyzing trace with hash 930621925, now seen corresponding path program 18 times [2020-07-20 17:55:00,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:00,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1438829435] [2020-07-20 17:55:00,548 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 [2020-07-20 17:55:00,661 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:00,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:00,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 545 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:55:00,667 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:01,249 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 775 proven. 2452 refuted. 0 times theorem prover too weak. 3534 trivial. 0 not checked. [2020-07-20 17:55:01,249 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:01,847 INFO L134 CoverageAnalysis]: Checked inductivity of 6761 backedges. 458 proven. 2453 refuted. 0 times theorem prover too weak. 3850 trivial. 0 not checked. [2020-07-20 17:55:01,847 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1438829435] [2020-07-20 17:55:01,847 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:01,847 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 33 [2020-07-20 17:55:01,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1509055641] [2020-07-20 17:55:01,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 17:55:01,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:01,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 17:55:01,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=861, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 17:55:01,849 INFO L87 Difference]: Start difference. First operand 248 states and 315 transitions. Second operand 33 states. [2020-07-20 17:55:06,157 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:06,157 INFO L93 Difference]: Finished difference Result 453 states and 590 transitions. [2020-07-20 17:55:06,158 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 81 states. [2020-07-20 17:55:06,158 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 351 [2020-07-20 17:55:06,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:06,160 INFO L225 Difference]: With dead ends: 453 [2020-07-20 17:55:06,160 INFO L226 Difference]: Without dead ends: 331 [2020-07-20 17:55:06,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 775 GetRequests, 665 SyntacticMatches, 5 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3651 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=2557, Invalid=8785, Unknown=0, NotChecked=0, Total=11342 [2020-07-20 17:55:06,164 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2020-07-20 17:55:06,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 274. [2020-07-20 17:55:06,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 274 states. [2020-07-20 17:55:06,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 274 states to 274 states and 351 transitions. [2020-07-20 17:55:06,216 INFO L78 Accepts]: Start accepts. Automaton has 274 states and 351 transitions. Word has length 351 [2020-07-20 17:55:06,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:06,217 INFO L479 AbstractCegarLoop]: Abstraction has 274 states and 351 transitions. [2020-07-20 17:55:06,217 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 17:55:06,217 INFO L276 IsEmpty]: Start isEmpty. Operand 274 states and 351 transitions. [2020-07-20 17:55:06,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 400 [2020-07-20 17:55:06,231 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:06,232 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 49, 48, 48, 48, 48, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:06,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:06,445 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:06,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:06,445 INFO L82 PathProgramCache]: Analyzing trace with hash 1703194347, now seen corresponding path program 19 times [2020-07-20 17:55:06,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:06,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [450843763] [2020-07-20 17:55:06,446 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 [2020-07-20 17:55:06,549 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:06,549 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:06,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 617 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 17:55:06,555 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:06,942 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 4410 proven. 749 refuted. 0 times theorem prover too weak. 3654 trivial. 0 not checked. [2020-07-20 17:55:06,943 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:07,544 INFO L134 CoverageAnalysis]: Checked inductivity of 8813 backedges. 2010 proven. 1763 refuted. 0 times theorem prover too weak. 5040 trivial. 0 not checked. [2020-07-20 17:55:07,544 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [450843763] [2020-07-20 17:55:07,545 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:07,545 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 30 [2020-07-20 17:55:07,545 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736378344] [2020-07-20 17:55:07,546 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 17:55:07,546 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:07,546 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 17:55:07,547 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=195, Invalid=675, Unknown=0, NotChecked=0, Total=870 [2020-07-20 17:55:07,547 INFO L87 Difference]: Start difference. First operand 274 states and 351 transitions. Second operand 30 states. [2020-07-20 17:55:09,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:09,727 INFO L93 Difference]: Finished difference Result 444 states and 588 transitions. [2020-07-20 17:55:09,729 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-07-20 17:55:09,729 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 399 [2020-07-20 17:55:09,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:09,732 INFO L225 Difference]: With dead ends: 444 [2020-07-20 17:55:09,733 INFO L226 Difference]: Without dead ends: 321 [2020-07-20 17:55:09,734 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 848 GetRequests, 769 SyntacticMatches, 4 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1255 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1660, Invalid=4192, Unknown=0, NotChecked=0, Total=5852 [2020-07-20 17:55:09,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 321 states. [2020-07-20 17:55:09,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 321 to 308. [2020-07-20 17:55:09,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 308 states. [2020-07-20 17:55:09,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 308 states to 308 states and 400 transitions. [2020-07-20 17:55:09,793 INFO L78 Accepts]: Start accepts. Automaton has 308 states and 400 transitions. Word has length 399 [2020-07-20 17:55:09,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:09,793 INFO L479 AbstractCegarLoop]: Abstraction has 308 states and 400 transitions. [2020-07-20 17:55:09,793 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 17:55:09,794 INFO L276 IsEmpty]: Start isEmpty. Operand 308 states and 400 transitions. [2020-07-20 17:55:09,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 407 [2020-07-20 17:55:09,797 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:09,797 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 50, 49, 49, 49, 49, 11, 10, 10, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:10,010 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:10,011 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:10,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:10,011 INFO L82 PathProgramCache]: Analyzing trace with hash -1852909686, now seen corresponding path program 20 times [2020-07-20 17:55:10,012 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:10,012 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1781043717] [2020-07-20 17:55:10,012 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 [2020-07-20 17:55:10,131 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:10,131 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:10,133 INFO L263 TraceCheckSpWp]: Trace formula consists of 628 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 17:55:10,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:10,440 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 1480 proven. 2573 refuted. 0 times theorem prover too weak. 5110 trivial. 0 not checked. [2020-07-20 17:55:10,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:10,888 INFO L134 CoverageAnalysis]: Checked inductivity of 9163 backedges. 767 proven. 2574 refuted. 0 times theorem prover too weak. 5822 trivial. 0 not checked. [2020-07-20 17:55:10,888 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1781043717] [2020-07-20 17:55:10,889 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:10,889 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2020-07-20 17:55:10,889 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [491961593] [2020-07-20 17:55:10,889 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 17:55:10,890 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:10,890 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 17:55:10,890 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=435, Unknown=0, NotChecked=0, Total=552 [2020-07-20 17:55:10,890 INFO L87 Difference]: Start difference. First operand 308 states and 400 transitions. Second operand 24 states. [2020-07-20 17:55:13,276 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:13,276 INFO L93 Difference]: Finished difference Result 708 states and 943 transitions. [2020-07-20 17:55:13,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 17:55:13,277 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 406 [2020-07-20 17:55:13,278 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:13,280 INFO L225 Difference]: With dead ends: 708 [2020-07-20 17:55:13,280 INFO L226 Difference]: Without dead ends: 575 [2020-07-20 17:55:13,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 868 GetRequests, 783 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2182 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1394, Invalid=5086, Unknown=0, NotChecked=0, Total=6480 [2020-07-20 17:55:13,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2020-07-20 17:55:13,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 408. [2020-07-20 17:55:13,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 408 states. [2020-07-20 17:55:13,371 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 408 states to 408 states and 530 transitions. [2020-07-20 17:55:13,372 INFO L78 Accepts]: Start accepts. Automaton has 408 states and 530 transitions. Word has length 406 [2020-07-20 17:55:13,372 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:13,373 INFO L479 AbstractCegarLoop]: Abstraction has 408 states and 530 transitions. [2020-07-20 17:55:13,373 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 17:55:13,373 INFO L276 IsEmpty]: Start isEmpty. Operand 408 states and 530 transitions. [2020-07-20 17:55:13,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 438 [2020-07-20 17:55:13,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:13,377 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 54, 53, 53, 53, 53, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:13,592 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:13,593 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:13,593 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:13,594 INFO L82 PathProgramCache]: Analyzing trace with hash 1246863545, now seen corresponding path program 21 times [2020-07-20 17:55:13,594 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:13,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1315587767] [2020-07-20 17:55:13,595 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 [2020-07-20 17:55:13,723 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:13,723 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:13,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 675 conjuncts, 13 conjunts are in the unsatisfiable core [2020-07-20 17:55:13,731 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:13,991 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 4950 proven. 605 refuted. 0 times theorem prover too weak. 5168 trivial. 0 not checked. [2020-07-20 17:55:13,991 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:14,577 INFO L134 CoverageAnalysis]: Checked inductivity of 10723 backedges. 3384 proven. 605 refuted. 0 times theorem prover too weak. 6734 trivial. 0 not checked. [2020-07-20 17:55:14,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1315587767] [2020-07-20 17:55:14,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:14,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 21 [2020-07-20 17:55:14,579 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1013470130] [2020-07-20 17:55:14,580 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 17:55:14,580 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:14,581 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 17:55:14,581 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=316, Unknown=0, NotChecked=0, Total=420 [2020-07-20 17:55:14,582 INFO L87 Difference]: Start difference. First operand 408 states and 530 transitions. Second operand 21 states. [2020-07-20 17:55:15,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:15,799 INFO L93 Difference]: Finished difference Result 557 states and 733 transitions. [2020-07-20 17:55:15,800 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-07-20 17:55:15,800 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 437 [2020-07-20 17:55:15,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:15,802 INFO L225 Difference]: With dead ends: 557 [2020-07-20 17:55:15,802 INFO L226 Difference]: Without dead ends: 327 [2020-07-20 17:55:15,804 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 905 GetRequests, 854 SyntacticMatches, 5 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=675, Invalid=1581, Unknown=0, NotChecked=0, Total=2256 [2020-07-20 17:55:15,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 327 states. [2020-07-20 17:55:15,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 327 to 327. [2020-07-20 17:55:15,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 327 states. [2020-07-20 17:55:15,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 422 transitions. [2020-07-20 17:55:15,867 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 422 transitions. Word has length 437 [2020-07-20 17:55:15,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:15,868 INFO L479 AbstractCegarLoop]: Abstraction has 327 states and 422 transitions. [2020-07-20 17:55:15,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 17:55:15,868 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 422 transitions. [2020-07-20 17:55:15,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 445 [2020-07-20 17:55:15,871 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:15,872 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 55, 54, 54, 54, 54, 12, 11, 11, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:16,086 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:16,086 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:16,086 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:16,087 INFO L82 PathProgramCache]: Analyzing trace with hash -833030556, now seen corresponding path program 22 times [2020-07-20 17:55:16,087 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:16,087 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1271689703] [2020-07-20 17:55:16,087 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 [2020-07-20 17:55:16,230 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:16,230 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:16,234 INFO L263 TraceCheckSpWp]: Trace formula consists of 683 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 17:55:16,239 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:16,621 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 1317 proven. 3531 refuted. 0 times theorem prover too weak. 6261 trivial. 0 not checked. [2020-07-20 17:55:16,622 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:17,181 INFO L134 CoverageAnalysis]: Checked inductivity of 11109 backedges. 710 proven. 3532 refuted. 0 times theorem prover too weak. 6867 trivial. 0 not checked. [2020-07-20 17:55:17,181 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1271689703] [2020-07-20 17:55:17,182 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:17,182 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 28 [2020-07-20 17:55:17,182 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [66123111] [2020-07-20 17:55:17,182 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 17:55:17,183 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:17,183 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 17:55:17,183 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2020-07-20 17:55:17,183 INFO L87 Difference]: Start difference. First operand 327 states and 422 transitions. Second operand 28 states. [2020-07-20 17:55:21,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:21,474 INFO L93 Difference]: Finished difference Result 545 states and 722 transitions. [2020-07-20 17:55:21,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2020-07-20 17:55:21,475 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 444 [2020-07-20 17:55:21,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:21,477 INFO L225 Difference]: With dead ends: 545 [2020-07-20 17:55:21,477 INFO L226 Difference]: Without dead ends: 402 [2020-07-20 17:55:21,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 970 GetRequests, 855 SyntacticMatches, 6 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4405 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2533, Invalid=9677, Unknown=0, NotChecked=0, Total=12210 [2020-07-20 17:55:21,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-20 17:55:21,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 348. [2020-07-20 17:55:21,548 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-20 17:55:21,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 450 transitions. [2020-07-20 17:55:21,549 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 450 transitions. Word has length 444 [2020-07-20 17:55:21,550 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:21,550 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 450 transitions. [2020-07-20 17:55:21,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 17:55:21,550 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 450 transitions. [2020-07-20 17:55:21,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 483 [2020-07-20 17:55:21,554 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:21,555 INFO L422 BasicCegarLoop]: trace histogram [60, 60, 60, 59, 59, 59, 59, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:21,767 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:21,768 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:21,768 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:21,769 INFO L82 PathProgramCache]: Analyzing trace with hash 1802445246, now seen corresponding path program 23 times [2020-07-20 17:55:21,769 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:21,769 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1067168205] [2020-07-20 17:55:21,769 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 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 27 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:21,894 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:21,894 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:21,897 INFO L263 TraceCheckSpWp]: Trace formula consists of 741 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 17:55:21,903 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:22,277 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 6090 proven. 834 refuted. 0 times theorem prover too weak. 6319 trivial. 0 not checked. [2020-07-20 17:55:22,277 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:22,973 INFO L134 CoverageAnalysis]: Checked inductivity of 13243 backedges. 3585 proven. 1557 refuted. 0 times theorem prover too weak. 8101 trivial. 0 not checked. [2020-07-20 17:55:22,973 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1067168205] [2020-07-20 17:55:22,973 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:22,974 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 25 [2020-07-20 17:55:22,974 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1943161043] [2020-07-20 17:55:22,975 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 17:55:22,975 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:22,975 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 17:55:22,976 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=459, Unknown=0, NotChecked=0, Total=600 [2020-07-20 17:55:22,976 INFO L87 Difference]: Start difference. First operand 348 states and 450 transitions. Second operand 25 states. [2020-07-20 17:55:24,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:24,769 INFO L93 Difference]: Finished difference Result 481 states and 632 transitions. [2020-07-20 17:55:24,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-20 17:55:24,770 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 482 [2020-07-20 17:55:24,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:24,772 INFO L225 Difference]: With dead ends: 481 [2020-07-20 17:55:24,772 INFO L226 Difference]: Without dead ends: 348 [2020-07-20 17:55:24,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1010 GetRequests, 940 SyntacticMatches, 5 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 902 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1270, Invalid=3152, Unknown=0, NotChecked=0, Total=4422 [2020-07-20 17:55:24,774 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 348 states. [2020-07-20 17:55:24,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 348 to 348. [2020-07-20 17:55:24,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 348 states. [2020-07-20 17:55:24,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 348 states to 348 states and 448 transitions. [2020-07-20 17:55:24,845 INFO L78 Accepts]: Start accepts. Automaton has 348 states and 448 transitions. Word has length 482 [2020-07-20 17:55:24,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:24,845 INFO L479 AbstractCegarLoop]: Abstraction has 348 states and 448 transitions. [2020-07-20 17:55:24,845 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 17:55:24,845 INFO L276 IsEmpty]: Start isEmpty. Operand 348 states and 448 transitions. [2020-07-20 17:55:24,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 490 [2020-07-20 17:55:24,849 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:24,849 INFO L422 BasicCegarLoop]: trace histogram [61, 61, 61, 60, 60, 60, 60, 13, 12, 12, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:25,062 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:25,063 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:25,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:25,064 INFO L82 PathProgramCache]: Analyzing trace with hash 564016575, now seen corresponding path program 24 times [2020-07-20 17:55:25,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:25,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [891387680] [2020-07-20 17:55:25,064 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 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 28 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:25,193 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:25,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:25,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 752 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:55:25,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:25,691 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 1088 proven. 4777 refuted. 0 times theorem prover too weak. 7807 trivial. 0 not checked. [2020-07-20 17:55:25,692 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:26,472 INFO L134 CoverageAnalysis]: Checked inductivity of 13672 backedges. 627 proven. 4778 refuted. 0 times theorem prover too weak. 8267 trivial. 0 not checked. [2020-07-20 17:55:26,472 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [891387680] [2020-07-20 17:55:26,472 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:26,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 32 [2020-07-20 17:55:26,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1831280827] [2020-07-20 17:55:26,473 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 17:55:26,473 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:26,473 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 17:55:26,474 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=805, Unknown=0, NotChecked=0, Total=992 [2020-07-20 17:55:26,474 INFO L87 Difference]: Start difference. First operand 348 states and 448 transitions. Second operand 32 states. [2020-07-20 17:55:32,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:32,558 INFO L93 Difference]: Finished difference Result 552 states and 727 transitions. [2020-07-20 17:55:32,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2020-07-20 17:55:32,559 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 489 [2020-07-20 17:55:32,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:32,561 INFO L225 Difference]: With dead ends: 552 [2020-07-20 17:55:32,561 INFO L226 Difference]: Without dead ends: 406 [2020-07-20 17:55:32,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1076 GetRequests, 941 SyntacticMatches, 6 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6262 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=3560, Invalid=13470, Unknown=0, NotChecked=0, Total=17030 [2020-07-20 17:55:32,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2020-07-20 17:55:32,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 372. [2020-07-20 17:55:32,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 372 states. [2020-07-20 17:55:32,646 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 372 states to 372 states and 480 transitions. [2020-07-20 17:55:32,646 INFO L78 Accepts]: Start accepts. Automaton has 372 states and 480 transitions. Word has length 489 [2020-07-20 17:55:32,647 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:32,647 INFO L479 AbstractCegarLoop]: Abstraction has 372 states and 480 transitions. [2020-07-20 17:55:32,647 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 17:55:32,647 INFO L276 IsEmpty]: Start isEmpty. Operand 372 states and 480 transitions. [2020-07-20 17:55:32,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 535 [2020-07-20 17:55:32,654 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:32,654 INFO L422 BasicCegarLoop]: trace histogram [67, 67, 67, 66, 66, 66, 66, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:32,869 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:32,870 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:32,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:32,870 INFO L82 PathProgramCache]: Analyzing trace with hash 869445188, now seen corresponding path program 25 times [2020-07-20 17:55:32,870 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:32,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2084354033] [2020-07-20 17:55:32,871 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 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 29 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:33,009 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:33,009 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:33,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 818 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 17:55:33,016 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:33,466 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 7531 proven. 1117 refuted. 0 times theorem prover too weak. 7854 trivial. 0 not checked. [2020-07-20 17:55:33,467 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:34,211 INFO L134 CoverageAnalysis]: Checked inductivity of 16502 backedges. 3921 proven. 2693 refuted. 0 times theorem prover too weak. 9888 trivial. 0 not checked. [2020-07-20 17:55:34,211 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2084354033] [2020-07-20 17:55:34,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:34,212 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 29 [2020-07-20 17:55:34,212 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528685956] [2020-07-20 17:55:34,212 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 17:55:34,212 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:34,213 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 17:55:34,213 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=628, Unknown=0, NotChecked=0, Total=812 [2020-07-20 17:55:34,213 INFO L87 Difference]: Start difference. First operand 372 states and 480 transitions. Second operand 29 states. [2020-07-20 17:55:37,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:37,089 INFO L93 Difference]: Finished difference Result 505 states and 661 transitions. [2020-07-20 17:55:37,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2020-07-20 17:55:37,090 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 534 [2020-07-20 17:55:37,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:37,095 INFO L225 Difference]: With dead ends: 505 [2020-07-20 17:55:37,095 INFO L226 Difference]: Without dead ends: 372 [2020-07-20 17:55:37,096 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1130 GetRequests, 1040 SyntacticMatches, 5 SemanticMatches, 85 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1697 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2104, Invalid=5378, Unknown=0, NotChecked=0, Total=7482 [2020-07-20 17:55:37,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 372 states. [2020-07-20 17:55:37,163 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 372 to 341. [2020-07-20 17:55:37,163 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 341 states. [2020-07-20 17:55:37,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 433 transitions. [2020-07-20 17:55:37,165 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 433 transitions. Word has length 534 [2020-07-20 17:55:37,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:37,166 INFO L479 AbstractCegarLoop]: Abstraction has 341 states and 433 transitions. [2020-07-20 17:55:37,166 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 17:55:37,166 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 433 transitions. [2020-07-20 17:55:37,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 542 [2020-07-20 17:55:37,171 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:37,171 INFO L422 BasicCegarLoop]: trace histogram [68, 68, 68, 67, 67, 67, 67, 14, 13, 13, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:37,384 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 29 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:37,385 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:37,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:37,386 INFO L82 PathProgramCache]: Analyzing trace with hash 943892089, now seen corresponding path program 26 times [2020-07-20 17:55:37,386 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:37,386 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [432286122] [2020-07-20 17:55:37,386 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 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 30 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:37,524 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:37,524 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:37,527 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 17:55:37,531 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:38,226 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 772 proven. 6374 refuted. 0 times theorem prover too weak. 9835 trivial. 0 not checked. [2020-07-20 17:55:38,226 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:39,071 INFO L134 CoverageAnalysis]: Checked inductivity of 16981 backedges. 509 proven. 6375 refuted. 0 times theorem prover too weak. 10097 trivial. 0 not checked. [2020-07-20 17:55:39,072 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [432286122] [2020-07-20 17:55:39,072 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:39,072 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-20 17:55:39,072 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536415178] [2020-07-20 17:55:39,073 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 17:55:39,073 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:39,073 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 17:55:39,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1029, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 17:55:39,073 INFO L87 Difference]: Start difference. First operand 341 states and 433 transitions. Second operand 36 states. [2020-07-20 17:55:46,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:46,624 INFO L93 Difference]: Finished difference Result 520 states and 674 transitions. [2020-07-20 17:55:46,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 115 states. [2020-07-20 17:55:46,624 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 541 [2020-07-20 17:55:46,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:46,627 INFO L225 Difference]: With dead ends: 520 [2020-07-20 17:55:46,627 INFO L226 Difference]: Without dead ends: 402 [2020-07-20 17:55:46,629 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1189 GetRequests, 1041 SyntacticMatches, 6 SemanticMatches, 142 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7485 ImplicationChecksByTransitivity, 6.4s TimeCoverageRelationStatistics Valid=4201, Invalid=16391, Unknown=0, NotChecked=0, Total=20592 [2020-07-20 17:55:46,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 402 states. [2020-07-20 17:55:46,699 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 402 to 368. [2020-07-20 17:55:46,699 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 368 states. [2020-07-20 17:55:46,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 368 states to 368 states and 469 transitions. [2020-07-20 17:55:46,702 INFO L78 Accepts]: Start accepts. Automaton has 368 states and 469 transitions. Word has length 541 [2020-07-20 17:55:46,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:46,702 INFO L479 AbstractCegarLoop]: Abstraction has 368 states and 469 transitions. [2020-07-20 17:55:46,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 17:55:46,703 INFO L276 IsEmpty]: Start isEmpty. Operand 368 states and 469 transitions. [2020-07-20 17:55:46,707 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 594 [2020-07-20 17:55:46,708 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:46,708 INFO L422 BasicCegarLoop]: trace histogram [75, 75, 75, 74, 74, 74, 74, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:46,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:46,923 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:46,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:46,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1328811571, now seen corresponding path program 27 times [2020-07-20 17:55:46,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:46,923 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1006709045] [2020-07-20 17:55:46,923 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 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 31 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:47,071 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:47,071 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:47,073 INFO L263 TraceCheckSpWp]: Trace formula consists of 906 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:55:47,079 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:47,792 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 9327 proven. 1463 refuted. 0 times theorem prover too weak. 9860 trivial. 0 not checked. [2020-07-20 17:55:47,792 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:48,727 INFO L134 CoverageAnalysis]: Checked inductivity of 20650 backedges. 4446 proven. 4022 refuted. 0 times theorem prover too weak. 12182 trivial. 0 not checked. [2020-07-20 17:55:48,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1006709045] [2020-07-20 17:55:48,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:48,728 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 33 [2020-07-20 17:55:48,728 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1548448095] [2020-07-20 17:55:48,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-07-20 17:55:48,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:48,729 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-07-20 17:55:48,729 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=823, Unknown=0, NotChecked=0, Total=1056 [2020-07-20 17:55:48,729 INFO L87 Difference]: Start difference. First operand 368 states and 469 transitions. Second operand 33 states. [2020-07-20 17:55:52,756 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:55:52,756 INFO L93 Difference]: Finished difference Result 649 states and 846 transitions. [2020-07-20 17:55:52,757 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-20 17:55:52,757 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 593 [2020-07-20 17:55:52,757 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:55:52,760 INFO L225 Difference]: With dead ends: 649 [2020-07-20 17:55:52,761 INFO L226 Difference]: Without dead ends: 410 [2020-07-20 17:55:52,764 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1265 GetRequests, 1154 SyntacticMatches, 5 SemanticMatches, 106 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2783 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=3271, Invalid=8285, Unknown=0, NotChecked=0, Total=11556 [2020-07-20 17:55:52,765 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 410 states. [2020-07-20 17:55:52,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 410 to 402. [2020-07-20 17:55:52,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 402 states. [2020-07-20 17:55:52,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 402 states to 402 states and 516 transitions. [2020-07-20 17:55:52,834 INFO L78 Accepts]: Start accepts. Automaton has 402 states and 516 transitions. Word has length 593 [2020-07-20 17:55:52,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:55:52,835 INFO L479 AbstractCegarLoop]: Abstraction has 402 states and 516 transitions. [2020-07-20 17:55:52,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-07-20 17:55:52,835 INFO L276 IsEmpty]: Start isEmpty. Operand 402 states and 516 transitions. [2020-07-20 17:55:52,839 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 601 [2020-07-20 17:55:52,840 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:55:52,840 INFO L422 BasicCegarLoop]: trace histogram [76, 76, 76, 75, 75, 75, 75, 15, 14, 14, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:55:53,054 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:53,055 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:55:53,055 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:55:53,056 INFO L82 PathProgramCache]: Analyzing trace with hash 1218530218, now seen corresponding path program 28 times [2020-07-20 17:55:53,056 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:55:53,056 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [561583299] [2020-07-20 17:55:53,056 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 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 32 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:55:53,203 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:55:53,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:55:53,206 INFO L263 TraceCheckSpWp]: Trace formula consists of 914 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 17:55:53,212 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:55:53,970 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 348 proven. 8394 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-20 17:55:53,970 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:55:55,023 INFO L134 CoverageAnalysis]: Checked inductivity of 21186 backedges. 347 proven. 8395 refuted. 0 times theorem prover too weak. 12444 trivial. 0 not checked. [2020-07-20 17:55:55,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [561583299] [2020-07-20 17:55:55,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:55:55,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 40 [2020-07-20 17:55:55,024 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1505325809] [2020-07-20 17:55:55,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-20 17:55:55,025 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:55:55,025 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-20 17:55:55,025 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=281, Invalid=1279, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 17:55:55,025 INFO L87 Difference]: Start difference. First operand 402 states and 516 transitions. Second operand 40 states. [2020-07-20 17:56:04,058 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:04,058 INFO L93 Difference]: Finished difference Result 702 states and 919 transitions. [2020-07-20 17:56:04,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2020-07-20 17:56:04,059 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 600 [2020-07-20 17:56:04,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:04,062 INFO L225 Difference]: With dead ends: 702 [2020-07-20 17:56:04,062 INFO L226 Difference]: Without dead ends: 527 [2020-07-20 17:56:04,064 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1322 GetRequests, 1155 SyntacticMatches, 6 SemanticMatches, 161 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9714 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=5642, Invalid=20764, Unknown=0, NotChecked=0, Total=26406 [2020-07-20 17:56:04,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 527 states. [2020-07-20 17:56:04,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 527 to 434. [2020-07-20 17:56:04,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 434 states. [2020-07-20 17:56:04,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 434 states to 434 states and 560 transitions. [2020-07-20 17:56:04,149 INFO L78 Accepts]: Start accepts. Automaton has 434 states and 560 transitions. Word has length 600 [2020-07-20 17:56:04,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:04,150 INFO L479 AbstractCegarLoop]: Abstraction has 434 states and 560 transitions. [2020-07-20 17:56:04,150 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-20 17:56:04,150 INFO L276 IsEmpty]: Start isEmpty. Operand 434 states and 560 transitions. [2020-07-20 17:56:04,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 663 [2020-07-20 17:56:04,156 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:04,156 INFO L422 BasicCegarLoop]: trace histogram [84, 84, 84, 83, 83, 83, 83, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:04,370 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:04,371 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:04,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:04,371 INFO L82 PathProgramCache]: Analyzing trace with hash -955730672, now seen corresponding path program 29 times [2020-07-20 17:56:04,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:04,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846226167] [2020-07-20 17:56:04,371 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 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 33 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:04,538 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:56:04,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:04,541 INFO L263 TraceCheckSpWp]: Trace formula consists of 1008 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 17:56:04,546 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:05,343 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 11572 proven. 1881 refuted. 0 times theorem prover too weak. 12437 trivial. 0 not checked. [2020-07-20 17:56:05,343 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:06,532 INFO L134 CoverageAnalysis]: Checked inductivity of 25890 backedges. 5254 proven. 5553 refuted. 0 times theorem prover too weak. 15083 trivial. 0 not checked. [2020-07-20 17:56:06,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846226167] [2020-07-20 17:56:06,533 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:06,533 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 37 [2020-07-20 17:56:06,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [47365555] [2020-07-20 17:56:06,534 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-07-20 17:56:06,534 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:06,535 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-07-20 17:56:06,535 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=288, Invalid=1044, Unknown=0, NotChecked=0, Total=1332 [2020-07-20 17:56:06,535 INFO L87 Difference]: Start difference. First operand 434 states and 560 transitions. Second operand 37 states. [2020-07-20 17:56:11,424 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:11,425 INFO L93 Difference]: Finished difference Result 642 states and 845 transitions. [2020-07-20 17:56:11,425 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2020-07-20 17:56:11,426 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 662 [2020-07-20 17:56:11,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:11,430 INFO L225 Difference]: With dead ends: 642 [2020-07-20 17:56:11,430 INFO L226 Difference]: Without dead ends: 476 [2020-07-20 17:56:11,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1404 GetRequests, 1288 SyntacticMatches, 5 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3033 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=3542, Invalid=9114, Unknown=0, NotChecked=0, Total=12656 [2020-07-20 17:56:11,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 476 states. [2020-07-20 17:56:11,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 476 to 468. [2020-07-20 17:56:11,530 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 468 states. [2020-07-20 17:56:11,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 468 states to 468 states and 607 transitions. [2020-07-20 17:56:11,532 INFO L78 Accepts]: Start accepts. Automaton has 468 states and 607 transitions. Word has length 662 [2020-07-20 17:56:11,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:11,533 INFO L479 AbstractCegarLoop]: Abstraction has 468 states and 607 transitions. [2020-07-20 17:56:11,533 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-07-20 17:56:11,533 INFO L276 IsEmpty]: Start isEmpty. Operand 468 states and 607 transitions. [2020-07-20 17:56:11,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 670 [2020-07-20 17:56:11,539 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:11,539 INFO L422 BasicCegarLoop]: trace histogram [85, 85, 85, 84, 84, 84, 84, 16, 15, 15, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:11,751 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:11,752 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:11,752 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:11,753 INFO L82 PathProgramCache]: Analyzing trace with hash 2116259269, now seen corresponding path program 30 times [2020-07-20 17:56:11,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:11,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [799085257] [2020-07-20 17:56:11,753 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 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 34 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:11,919 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:56:11,920 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:11,923 INFO L263 TraceCheckSpWp]: Trace formula consists of 1019 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 17:56:11,928 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:12,492 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 2050 proven. 8359 refuted. 0 times theorem prover too weak. 16081 trivial. 0 not checked. [2020-07-20 17:56:12,492 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:13,426 INFO L134 CoverageAnalysis]: Checked inductivity of 26490 backedges. 1083 proven. 8360 refuted. 0 times theorem prover too weak. 17047 trivial. 0 not checked. [2020-07-20 17:56:13,427 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [799085257] [2020-07-20 17:56:13,427 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:13,427 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2020-07-20 17:56:13,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724772800] [2020-07-20 17:56:13,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 17:56:13,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:13,428 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 17:56:13,428 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=554, Unknown=0, NotChecked=0, Total=702 [2020-07-20 17:56:13,429 INFO L87 Difference]: Start difference. First operand 468 states and 607 transitions. Second operand 27 states. [2020-07-20 17:56:17,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:17,524 INFO L93 Difference]: Finished difference Result 1029 states and 1363 transitions. [2020-07-20 17:56:17,525 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2020-07-20 17:56:17,525 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 669 [2020-07-20 17:56:17,526 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:17,529 INFO L225 Difference]: With dead ends: 1029 [2020-07-20 17:56:17,529 INFO L226 Difference]: Without dead ends: 859 [2020-07-20 17:56:17,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1414 GetRequests, 1305 SyntacticMatches, 7 SemanticMatches, 102 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3938 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=2225, Invalid=8487, Unknown=0, NotChecked=0, Total=10712 [2020-07-20 17:56:17,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 859 states. [2020-07-20 17:56:17,664 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 859 to 613. [2020-07-20 17:56:17,664 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 613 states. [2020-07-20 17:56:17,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 613 states to 613 states and 796 transitions. [2020-07-20 17:56:17,667 INFO L78 Accepts]: Start accepts. Automaton has 613 states and 796 transitions. Word has length 669 [2020-07-20 17:56:17,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:17,668 INFO L479 AbstractCegarLoop]: Abstraction has 613 states and 796 transitions. [2020-07-20 17:56:17,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 17:56:17,668 INFO L276 IsEmpty]: Start isEmpty. Operand 613 states and 796 transitions. [2020-07-20 17:56:17,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 708 [2020-07-20 17:56:17,675 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:17,675 INFO L422 BasicCegarLoop]: trace histogram [90, 90, 90, 89, 89, 89, 89, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:17,888 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:17,889 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:17,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:17,890 INFO L82 PathProgramCache]: Analyzing trace with hash -1360123809, now seen corresponding path program 31 times [2020-07-20 17:56:17,890 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:17,890 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [483388527] [2020-07-20 17:56:17,890 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 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 35 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:18,064 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:56:18,064 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:18,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 1074 conjuncts, 15 conjunts are in the unsatisfiable core [2020-07-20 17:56:18,073 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:18,585 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 12374 proven. 1344 refuted. 0 times theorem prover too weak. 16019 trivial. 0 not checked. [2020-07-20 17:56:18,586 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:19,548 INFO L134 CoverageAnalysis]: Checked inductivity of 29737 backedges. 9512 proven. 1344 refuted. 0 times theorem prover too weak. 18881 trivial. 0 not checked. [2020-07-20 17:56:19,548 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [483388527] [2020-07-20 17:56:19,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:19,549 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 24 [2020-07-20 17:56:19,549 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107161444] [2020-07-20 17:56:19,550 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-20 17:56:19,550 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:19,550 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-20 17:56:19,550 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=418, Unknown=0, NotChecked=0, Total=552 [2020-07-20 17:56:19,550 INFO L87 Difference]: Start difference. First operand 613 states and 796 transitions. Second operand 24 states. [2020-07-20 17:56:21,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:21,454 INFO L93 Difference]: Finished difference Result 802 states and 1052 transitions. [2020-07-20 17:56:21,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-07-20 17:56:21,455 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 707 [2020-07-20 17:56:21,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:21,459 INFO L225 Difference]: With dead ends: 802 [2020-07-20 17:56:21,459 INFO L226 Difference]: Without dead ends: 490 [2020-07-20 17:56:21,461 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1455 GetRequests, 1391 SyntacticMatches, 6 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 684 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1039, Invalid=2501, Unknown=0, NotChecked=0, Total=3540 [2020-07-20 17:56:21,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 490 states. [2020-07-20 17:56:21,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 490 to 490. [2020-07-20 17:56:21,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 490 states. [2020-07-20 17:56:21,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 490 states to 490 states and 633 transitions. [2020-07-20 17:56:21,539 INFO L78 Accepts]: Start accepts. Automaton has 490 states and 633 transitions. Word has length 707 [2020-07-20 17:56:21,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:21,540 INFO L479 AbstractCegarLoop]: Abstraction has 490 states and 633 transitions. [2020-07-20 17:56:21,540 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-20 17:56:21,540 INFO L276 IsEmpty]: Start isEmpty. Operand 490 states and 633 transitions. [2020-07-20 17:56:21,546 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 715 [2020-07-20 17:56:21,546 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:21,547 INFO L422 BasicCegarLoop]: trace histogram [91, 91, 91, 90, 90, 90, 90, 17, 16, 16, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:21,759 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:21,760 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:21,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:21,761 INFO L82 PathProgramCache]: Analyzing trace with hash 1558816766, now seen corresponding path program 32 times [2020-07-20 17:56:21,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:21,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [415978276] [2020-07-20 17:56:21,761 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 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 36 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:21,932 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:56:21,933 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:21,936 INFO L263 TraceCheckSpWp]: Trace formula consists of 1085 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:56:21,943 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:22,630 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 1607 proven. 10306 refuted. 0 times theorem prover too weak. 18467 trivial. 0 not checked. [2020-07-20 17:56:22,630 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:23,821 INFO L134 CoverageAnalysis]: Checked inductivity of 30380 backedges. 906 proven. 10307 refuted. 0 times theorem prover too weak. 19167 trivial. 0 not checked. [2020-07-20 17:56:23,822 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [415978276] [2020-07-20 17:56:23,822 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:23,822 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 31 [2020-07-20 17:56:23,822 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [321056890] [2020-07-20 17:56:23,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 17:56:23,823 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:23,823 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 17:56:23,824 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=747, Unknown=0, NotChecked=0, Total=930 [2020-07-20 17:56:23,824 INFO L87 Difference]: Start difference. First operand 490 states and 633 transitions. Second operand 31 states. [2020-07-20 17:56:32,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:32,177 INFO L93 Difference]: Finished difference Result 785 states and 1037 transitions. [2020-07-20 17:56:32,178 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2020-07-20 17:56:32,178 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 714 [2020-07-20 17:56:32,179 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:32,182 INFO L225 Difference]: With dead ends: 785 [2020-07-20 17:56:32,182 INFO L226 Difference]: Without dead ends: 605 [2020-07-20 17:56:32,184 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1546 GetRequests, 1391 SyntacticMatches, 7 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8958 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=4408, Invalid=17942, Unknown=0, NotChecked=0, Total=22350 [2020-07-20 17:56:32,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2020-07-20 17:56:32,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 514. [2020-07-20 17:56:32,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-20 17:56:32,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 665 transitions. [2020-07-20 17:56:32,327 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 665 transitions. Word has length 714 [2020-07-20 17:56:32,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:32,328 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 665 transitions. [2020-07-20 17:56:32,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 17:56:32,328 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 665 transitions. [2020-07-20 17:56:32,335 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 760 [2020-07-20 17:56:32,335 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:32,336 INFO L422 BasicCegarLoop]: trace histogram [97, 97, 97, 96, 96, 96, 96, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:32,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:32,551 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:32,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:32,552 INFO L82 PathProgramCache]: Analyzing trace with hash 937711205, now seen corresponding path program 33 times [2020-07-20 17:56:32,552 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:32,552 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846871431] [2020-07-20 17:56:32,553 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 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 37 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:32,823 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:56:32,824 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:32,829 INFO L263 TraceCheckSpWp]: Trace formula consists of 1151 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 17:56:32,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:33,513 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 14422 proven. 1721 refuted. 0 times theorem prover too weak. 18394 trivial. 0 not checked. [2020-07-20 17:56:33,513 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:34,697 INFO L134 CoverageAnalysis]: Checked inductivity of 34537 backedges. 9744 proven. 3285 refuted. 0 times theorem prover too weak. 21508 trivial. 0 not checked. [2020-07-20 17:56:34,697 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846871431] [2020-07-20 17:56:34,697 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:34,698 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 28 [2020-07-20 17:56:34,698 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745173767] [2020-07-20 17:56:34,698 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-07-20 17:56:34,699 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:34,699 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-07-20 17:56:34,699 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=175, Invalid=581, Unknown=0, NotChecked=0, Total=756 [2020-07-20 17:56:34,699 INFO L87 Difference]: Start difference. First operand 514 states and 665 transitions. Second operand 28 states. [2020-07-20 17:56:37,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:37,782 INFO L93 Difference]: Finished difference Result 684 states and 896 transitions. [2020-07-20 17:56:37,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-07-20 17:56:37,784 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 759 [2020-07-20 17:56:37,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:37,786 INFO L225 Difference]: With dead ends: 684 [2020-07-20 17:56:37,787 INFO L226 Difference]: Without dead ends: 514 [2020-07-20 17:56:37,788 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1576 GetRequests, 1491 SyntacticMatches, 6 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1396 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1853, Invalid=4627, Unknown=0, NotChecked=0, Total=6480 [2020-07-20 17:56:37,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2020-07-20 17:56:37,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 514. [2020-07-20 17:56:37,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 514 states. [2020-07-20 17:56:37,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 514 states to 514 states and 663 transitions. [2020-07-20 17:56:37,867 INFO L78 Accepts]: Start accepts. Automaton has 514 states and 663 transitions. Word has length 759 [2020-07-20 17:56:37,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:37,868 INFO L479 AbstractCegarLoop]: Abstraction has 514 states and 663 transitions. [2020-07-20 17:56:37,868 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-07-20 17:56:37,868 INFO L276 IsEmpty]: Start isEmpty. Operand 514 states and 663 transitions. [2020-07-20 17:56:37,873 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 767 [2020-07-20 17:56:37,873 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:37,873 INFO L422 BasicCegarLoop]: trace histogram [98, 98, 98, 97, 97, 97, 97, 18, 17, 17, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:38,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:38,074 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:38,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:38,075 INFO L82 PathProgramCache]: Analyzing trace with hash -661993672, now seen corresponding path program 34 times [2020-07-20 17:56:38,076 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:38,076 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [925979802] [2020-07-20 17:56:38,076 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 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 38 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:38,263 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:56:38,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:38,266 INFO L263 TraceCheckSpWp]: Trace formula consists of 1162 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 17:56:38,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:39,153 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 1077 proven. 12698 refuted. 0 times theorem prover too weak. 21455 trivial. 0 not checked. [2020-07-20 17:56:39,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:40,523 INFO L134 CoverageAnalysis]: Checked inductivity of 35230 backedges. 694 proven. 12699 refuted. 0 times theorem prover too weak. 21837 trivial. 0 not checked. [2020-07-20 17:56:40,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [925979802] [2020-07-20 17:56:40,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:40,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-20 17:56:40,524 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [740967168] [2020-07-20 17:56:40,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 17:56:40,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:40,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 17:56:40,525 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=224, Invalid=966, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 17:56:40,526 INFO L87 Difference]: Start difference. First operand 514 states and 663 transitions. Second operand 35 states. [2020-07-20 17:56:52,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:56:52,045 INFO L93 Difference]: Finished difference Result 784 states and 1029 transitions. [2020-07-20 17:56:52,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 147 states. [2020-07-20 17:56:52,047 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 766 [2020-07-20 17:56:52,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:56:52,050 INFO L225 Difference]: With dead ends: 784 [2020-07-20 17:56:52,050 INFO L226 Difference]: Without dead ends: 601 [2020-07-20 17:56:52,052 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1671 GetRequests, 1491 SyntacticMatches, 7 SemanticMatches, 173 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12320 ImplicationChecksByTransitivity, 9.8s TimeCoverageRelationStatistics Valid=5987, Invalid=24463, Unknown=0, NotChecked=0, Total=30450 [2020-07-20 17:56:52,052 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2020-07-20 17:56:52,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 541. [2020-07-20 17:56:52,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-20 17:56:52,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 699 transitions. [2020-07-20 17:56:52,142 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 699 transitions. Word has length 766 [2020-07-20 17:56:52,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:56:52,143 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 699 transitions. [2020-07-20 17:56:52,143 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 17:56:52,143 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 699 transitions. [2020-07-20 17:56:52,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 819 [2020-07-20 17:56:52,148 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:56:52,148 INFO L422 BasicCegarLoop]: trace histogram [105, 105, 105, 104, 104, 104, 104, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:56:52,349 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:52,349 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:56:52,350 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:56:52,350 INFO L82 PathProgramCache]: Analyzing trace with hash -1871274638, now seen corresponding path program 35 times [2020-07-20 17:56:52,350 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:56:52,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1046009557] [2020-07-20 17:56:52,351 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 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 39 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:56:52,547 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:56:52,548 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:56:52,551 INFO L263 TraceCheckSpWp]: Trace formula consists of 1239 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:56:52,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:56:53,420 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 16919 proven. 2161 refuted. 0 times theorem prover too weak. 21360 trivial. 0 not checked. [2020-07-20 17:56:53,420 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:56:54,931 INFO L134 CoverageAnalysis]: Checked inductivity of 40440 backedges. 10149 proven. 5529 refuted. 0 times theorem prover too weak. 24762 trivial. 0 not checked. [2020-07-20 17:56:54,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1046009557] [2020-07-20 17:56:54,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:56:54,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 32 [2020-07-20 17:56:54,933 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [140574184] [2020-07-20 17:56:54,934 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-07-20 17:56:54,934 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:56:54,934 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-07-20 17:56:54,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=222, Invalid=770, Unknown=0, NotChecked=0, Total=992 [2020-07-20 17:56:54,934 INFO L87 Difference]: Start difference. First operand 541 states and 699 transitions. Second operand 32 states. [2020-07-20 17:57:01,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:57:01,969 INFO L93 Difference]: Finished difference Result 711 states and 929 transitions. [2020-07-20 17:57:01,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2020-07-20 17:57:01,971 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 818 [2020-07-20 17:57:01,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:57:01,975 INFO L225 Difference]: With dead ends: 711 [2020-07-20 17:57:01,975 INFO L226 Difference]: Without dead ends: 541 [2020-07-20 17:57:01,977 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1712 GetRequests, 1605 SyntacticMatches, 6 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2503 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=2931, Invalid=7575, Unknown=0, NotChecked=0, Total=10506 [2020-07-20 17:57:01,978 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 541 states. [2020-07-20 17:57:02,110 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 541 to 541. [2020-07-20 17:57:02,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 541 states. [2020-07-20 17:57:02,112 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 541 states to 541 states and 697 transitions. [2020-07-20 17:57:02,112 INFO L78 Accepts]: Start accepts. Automaton has 541 states and 697 transitions. Word has length 818 [2020-07-20 17:57:02,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:02,113 INFO L479 AbstractCegarLoop]: Abstraction has 541 states and 697 transitions. [2020-07-20 17:57:02,113 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-07-20 17:57:02,113 INFO L276 IsEmpty]: Start isEmpty. Operand 541 states and 697 transitions. [2020-07-20 17:57:02,121 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 826 [2020-07-20 17:57:02,122 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:02,122 INFO L422 BasicCegarLoop]: trace histogram [106, 106, 106, 105, 105, 105, 105, 19, 18, 18, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:57:02,336 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 39 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:02,337 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:02,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:02,338 INFO L82 PathProgramCache]: Analyzing trace with hash -778442869, now seen corresponding path program 36 times [2020-07-20 17:57:02,338 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:02,338 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [997895567] [2020-07-20 17:57:02,339 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 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 40 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:02,534 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:57:02,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:02,538 INFO L263 TraceCheckSpWp]: Trace formula consists of 1250 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 17:57:02,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:03,603 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 439 proven. 15607 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-20 17:57:03,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:05,320 INFO L134 CoverageAnalysis]: Checked inductivity of 41190 backedges. 438 proven. 15608 refuted. 0 times theorem prover too weak. 25144 trivial. 0 not checked. [2020-07-20 17:57:05,321 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [997895567] [2020-07-20 17:57:05,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:57:05,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 39 [2020-07-20 17:57:05,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889370573] [2020-07-20 17:57:05,322 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-20 17:57:05,322 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:05,322 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-20 17:57:05,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=271, Invalid=1211, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 17:57:05,323 INFO L87 Difference]: Start difference. First operand 541 states and 697 transitions. Second operand 39 states. [2020-07-20 17:57:22,039 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:57:22,039 INFO L93 Difference]: Finished difference Result 791 states and 1034 transitions. [2020-07-20 17:57:22,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 165 states. [2020-07-20 17:57:22,041 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 825 [2020-07-20 17:57:22,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:57:22,045 INFO L225 Difference]: With dead ends: 791 [2020-07-20 17:57:22,045 INFO L226 Difference]: Without dead ends: 605 [2020-07-20 17:57:22,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1807 GetRequests, 1605 SyntacticMatches, 7 SemanticMatches, 195 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15667 ImplicationChecksByTransitivity, 14.0s TimeCoverageRelationStatistics Valid=7390, Invalid=31222, Unknown=0, NotChecked=0, Total=38612 [2020-07-20 17:57:22,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 605 states. [2020-07-20 17:57:22,155 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 605 to 571. [2020-07-20 17:57:22,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 571 states. [2020-07-20 17:57:22,156 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 571 states to 571 states and 737 transitions. [2020-07-20 17:57:22,156 INFO L78 Accepts]: Start accepts. Automaton has 571 states and 737 transitions. Word has length 825 [2020-07-20 17:57:22,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:22,157 INFO L479 AbstractCegarLoop]: Abstraction has 571 states and 737 transitions. [2020-07-20 17:57:22,157 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-20 17:57:22,157 INFO L276 IsEmpty]: Start isEmpty. Operand 571 states and 737 transitions. [2020-07-20 17:57:22,163 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 885 [2020-07-20 17:57:22,163 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:22,163 INFO L422 BasicCegarLoop]: trace histogram [114, 114, 114, 113, 113, 113, 113, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:57:22,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:22,369 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:22,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:22,370 INFO L82 PathProgramCache]: Analyzing trace with hash -1882081448, now seen corresponding path program 37 times [2020-07-20 17:57:22,370 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:22,370 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [607210064] [2020-07-20 17:57:22,370 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 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 41 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:22,598 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:57:22,598 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:22,603 INFO L263 TraceCheckSpWp]: Trace formula consists of 1335 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 17:57:22,610 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:23,723 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 19928 proven. 2673 refuted. 0 times theorem prover too weak. 25016 trivial. 0 not checked. [2020-07-20 17:57:23,724 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:25,673 INFO L134 CoverageAnalysis]: Checked inductivity of 47617 backedges. 10790 proven. 8085 refuted. 0 times theorem prover too weak. 28742 trivial. 0 not checked. [2020-07-20 17:57:25,674 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [607210064] [2020-07-20 17:57:25,674 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:57:25,674 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-20 17:57:25,674 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549446092] [2020-07-20 17:57:25,675 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 17:57:25,676 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:25,676 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 17:57:25,676 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=275, Invalid=985, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 17:57:25,676 INFO L87 Difference]: Start difference. First operand 571 states and 737 transitions. Second operand 36 states. [2020-07-20 17:57:32,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:57:32,982 INFO L93 Difference]: Finished difference Result 742 states and 967 transitions. [2020-07-20 17:57:32,984 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2020-07-20 17:57:32,984 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 884 [2020-07-20 17:57:32,985 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:57:32,988 INFO L225 Difference]: With dead ends: 742 [2020-07-20 17:57:32,988 INFO L226 Difference]: Without dead ends: 572 [2020-07-20 17:57:32,989 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1863 GetRequests, 1733 SyntacticMatches, 6 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3978 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=4351, Invalid=11399, Unknown=0, NotChecked=0, Total=15750 [2020-07-20 17:57:32,990 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 572 states. [2020-07-20 17:57:33,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 572 to 540. [2020-07-20 17:57:33,079 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 540 states. [2020-07-20 17:57:33,080 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 540 states to 540 states and 692 transitions. [2020-07-20 17:57:33,080 INFO L78 Accepts]: Start accepts. Automaton has 540 states and 692 transitions. Word has length 884 [2020-07-20 17:57:33,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:33,081 INFO L479 AbstractCegarLoop]: Abstraction has 540 states and 692 transitions. [2020-07-20 17:57:33,081 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 17:57:33,081 INFO L276 IsEmpty]: Start isEmpty. Operand 540 states and 692 transitions. [2020-07-20 17:57:33,087 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 892 [2020-07-20 17:57:33,087 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:33,088 INFO L422 BasicCegarLoop]: trace histogram [115, 115, 115, 114, 114, 114, 114, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:57:33,293 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:33,294 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:33,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:33,295 INFO L82 PathProgramCache]: Analyzing trace with hash 932118245, now seen corresponding path program 38 times [2020-07-20 17:57:33,295 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:33,295 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [199204501] [2020-07-20 17:57:33,296 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 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 42 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:33,531 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 4 check-sat command(s) [2020-07-20 17:57:33,531 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:33,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 1569 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 17:57:33,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:34,215 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:57:34,216 INFO L501 QuantifierPusher]: Distributing 2 conjuncts over 2 disjuncts [2020-07-20 17:57:34,710 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 17979 proven. 150 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-20 17:57:34,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:34,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 17:57:36,758 INFO L134 CoverageAnalysis]: Checked inductivity of 48431 backedges. 7048 proven. 11081 refuted. 0 times theorem prover too weak. 30302 trivial. 0 not checked. [2020-07-20 17:57:36,758 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [199204501] [2020-07-20 17:57:36,759 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:57:36,759 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 36 [2020-07-20 17:57:36,759 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1026636763] [2020-07-20 17:57:36,760 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-07-20 17:57:36,760 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:36,760 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-07-20 17:57:36,760 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=854, Unknown=0, NotChecked=0, Total=1260 [2020-07-20 17:57:36,760 INFO L87 Difference]: Start difference. First operand 540 states and 692 transitions. Second operand 36 states. [2020-07-20 17:57:40,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:57:40,717 INFO L93 Difference]: Finished difference Result 690 states and 898 transitions. [2020-07-20 17:57:40,719 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2020-07-20 17:57:40,719 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 891 [2020-07-20 17:57:40,720 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:57:40,724 INFO L225 Difference]: With dead ends: 690 [2020-07-20 17:57:40,724 INFO L226 Difference]: Without dead ends: 688 [2020-07-20 17:57:40,724 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1853 GetRequests, 1757 SyntacticMatches, 6 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2506 ImplicationChecksByTransitivity, 3.5s TimeCoverageRelationStatistics Valid=2537, Invalid=5835, Unknown=0, NotChecked=0, Total=8372 [2020-07-20 17:57:40,725 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 688 states. [2020-07-20 17:57:40,819 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 688 to 610. [2020-07-20 17:57:40,819 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 610 states. [2020-07-20 17:57:40,820 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 610 states to 610 states and 794 transitions. [2020-07-20 17:57:40,821 INFO L78 Accepts]: Start accepts. Automaton has 610 states and 794 transitions. Word has length 891 [2020-07-20 17:57:40,821 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:57:40,821 INFO L479 AbstractCegarLoop]: Abstraction has 610 states and 794 transitions. [2020-07-20 17:57:40,822 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-07-20 17:57:40,822 INFO L276 IsEmpty]: Start isEmpty. Operand 610 states and 794 transitions. [2020-07-20 17:57:40,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 934 [2020-07-20 17:57:40,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:57:40,832 INFO L422 BasicCegarLoop]: trace histogram [121, 121, 121, 120, 120, 120, 120, 20, 19, 19, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:57:41,042 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:41,043 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:57:41,043 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:57:41,044 INFO L82 PathProgramCache]: Analyzing trace with hash -1311394747, now seen corresponding path program 39 times [2020-07-20 17:57:41,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:57:41,044 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1399478300] [2020-07-20 17:57:41,045 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 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 43 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:57:41,268 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:57:41,268 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:57:41,273 INFO L263 TraceCheckSpWp]: Trace formula consists of 1409 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 17:57:41,280 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:57:42,718 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 4622 proven. 19114 refuted. 0 times theorem prover too weak. 29726 trivial. 0 not checked. [2020-07-20 17:57:42,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:57:45,052 INFO L134 CoverageAnalysis]: Checked inductivity of 53462 backedges. 2331 proven. 19115 refuted. 0 times theorem prover too weak. 32016 trivial. 0 not checked. [2020-07-20 17:57:45,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1399478300] [2020-07-20 17:57:45,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:57:45,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 43 [2020-07-20 17:57:45,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631244580] [2020-07-20 17:57:45,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-20 17:57:45,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:57:45,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-20 17:57:45,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=324, Invalid=1482, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 17:57:45,055 INFO L87 Difference]: Start difference. First operand 610 states and 794 transitions. Second operand 43 states. [2020-07-20 17:58:08,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:08,287 INFO L93 Difference]: Finished difference Result 911 states and 1218 transitions. [2020-07-20 17:58:08,289 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 178 states. [2020-07-20 17:58:08,289 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 933 [2020-07-20 17:58:08,290 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:08,293 INFO L225 Difference]: With dead ends: 911 [2020-07-20 17:58:08,293 INFO L226 Difference]: Without dead ends: 695 [2020-07-20 17:58:08,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2036 GetRequests, 1817 SyntacticMatches, 7 SemanticMatches, 212 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18507 ImplicationChecksByTransitivity, 19.1s TimeCoverageRelationStatistics Valid=8934, Invalid=36648, Unknown=0, NotChecked=0, Total=45582 [2020-07-20 17:58:08,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 695 states. [2020-07-20 17:58:08,401 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 695 to 643. [2020-07-20 17:58:08,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 643 states. [2020-07-20 17:58:08,403 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 643 states to 643 states and 838 transitions. [2020-07-20 17:58:08,404 INFO L78 Accepts]: Start accepts. Automaton has 643 states and 838 transitions. Word has length 933 [2020-07-20 17:58:08,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:08,405 INFO L479 AbstractCegarLoop]: Abstraction has 643 states and 838 transitions. [2020-07-20 17:58:08,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-20 17:58:08,405 INFO L276 IsEmpty]: Start isEmpty. Operand 643 states and 838 transitions. [2020-07-20 17:58:08,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1000 [2020-07-20 17:58:08,416 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:08,417 INFO L422 BasicCegarLoop]: trace histogram [130, 130, 130, 129, 129, 129, 129, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:08,629 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:08,630 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:08,630 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:08,631 INFO L82 PathProgramCache]: Analyzing trace with hash -874980193, now seen corresponding path program 40 times [2020-07-20 17:58:08,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:08,631 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115005765] [2020-07-20 17:58:08,632 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 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 44 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:08,871 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:58:08,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:08,876 INFO L263 TraceCheckSpWp]: Trace formula consists of 1505 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 17:58:08,883 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:10,422 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 28429 proven. 3266 refuted. 0 times theorem prover too weak. 29980 trivial. 0 not checked. [2020-07-20 17:58:10,422 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:13,196 INFO L134 CoverageAnalysis]: Checked inductivity of 61675 backedges. 13923 proven. 10962 refuted. 0 times theorem prover too weak. 36790 trivial. 0 not checked. [2020-07-20 17:58:13,196 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115005765] [2020-07-20 17:58:13,196 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:13,197 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 40 [2020-07-20 17:58:13,197 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1438189994] [2020-07-20 17:58:13,198 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-07-20 17:58:13,198 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:13,198 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-07-20 17:58:13,199 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=334, Invalid=1226, Unknown=0, NotChecked=0, Total=1560 [2020-07-20 17:58:13,199 INFO L87 Difference]: Start difference. First operand 643 states and 838 transitions. Second operand 40 states. [2020-07-20 17:58:25,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:58:25,069 INFO L93 Difference]: Finished difference Result 1106 states and 1481 transitions. [2020-07-20 17:58:25,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2020-07-20 17:58:25,072 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 999 [2020-07-20 17:58:25,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:58:25,076 INFO L225 Difference]: With dead ends: 1106 [2020-07-20 17:58:25,076 INFO L226 Difference]: Without dead ends: 715 [2020-07-20 17:58:25,079 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2114 GetRequests, 1959 SyntacticMatches, 6 SemanticMatches, 149 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5991 ImplicationChecksByTransitivity, 9.5s TimeCoverageRelationStatistics Valid=6299, Invalid=16351, Unknown=0, NotChecked=0, Total=22650 [2020-07-20 17:58:25,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 715 states. [2020-07-20 17:58:25,193 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 715 to 695. [2020-07-20 17:58:25,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 695 states. [2020-07-20 17:58:25,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 695 states to 695 states and 913 transitions. [2020-07-20 17:58:25,195 INFO L78 Accepts]: Start accepts. Automaton has 695 states and 913 transitions. Word has length 999 [2020-07-20 17:58:25,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:58:25,196 INFO L479 AbstractCegarLoop]: Abstraction has 695 states and 913 transitions. [2020-07-20 17:58:25,196 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-07-20 17:58:25,196 INFO L276 IsEmpty]: Start isEmpty. Operand 695 states and 913 transitions. [2020-07-20 17:58:25,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1007 [2020-07-20 17:58:25,204 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:58:25,205 INFO L422 BasicCegarLoop]: trace histogram [131, 131, 131, 130, 130, 130, 130, 21, 20, 20, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:58:25,405 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:25,405 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:58:25,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:58:25,406 INFO L82 PathProgramCache]: Analyzing trace with hash -1744475458, now seen corresponding path program 41 times [2020-07-20 17:58:25,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:58:25,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [605098257] [2020-07-20 17:58:25,407 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 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 45 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:58:25,647 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:58:25,647 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:58:25,652 INFO L263 TraceCheckSpWp]: Trace formula consists of 1516 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 17:58:25,659 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:58:27,508 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 4173 proven. 23309 refuted. 0 times theorem prover too weak. 35120 trivial. 0 not checked. [2020-07-20 17:58:27,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:58:30,613 INFO L134 CoverageAnalysis]: Checked inductivity of 62602 backedges. 2164 proven. 23310 refuted. 0 times theorem prover too weak. 37128 trivial. 0 not checked. [2020-07-20 17:58:30,613 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [605098257] [2020-07-20 17:58:30,614 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:58:30,614 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 47 [2020-07-20 17:58:30,614 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209497390] [2020-07-20 17:58:30,615 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-07-20 17:58:30,615 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:58:30,615 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-07-20 17:58:30,615 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=383, Invalid=1779, Unknown=0, NotChecked=0, Total=2162 [2020-07-20 17:58:30,616 INFO L87 Difference]: Start difference. First operand 695 states and 913 transitions. Second operand 47 states. [2020-07-20 17:59:03,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:03,150 INFO L93 Difference]: Finished difference Result 1178 states and 1580 transitions. [2020-07-20 17:59:03,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 195 states. [2020-07-20 17:59:03,154 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 1006 [2020-07-20 17:59:03,155 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:03,159 INFO L225 Difference]: With dead ends: 1178 [2020-07-20 17:59:03,159 INFO L226 Difference]: Without dead ends: 871 [2020-07-20 17:59:03,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2199 GetRequests, 1959 SyntacticMatches, 7 SemanticMatches, 233 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22228 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=10926, Invalid=44064, Unknown=0, NotChecked=0, Total=54990 [2020-07-20 17:59:03,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 871 states. [2020-07-20 17:59:03,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 871 to 733. [2020-07-20 17:59:03,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 733 states. [2020-07-20 17:59:03,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 733 states to 733 states and 965 transitions. [2020-07-20 17:59:03,350 INFO L78 Accepts]: Start accepts. Automaton has 733 states and 965 transitions. Word has length 1006 [2020-07-20 17:59:03,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:03,351 INFO L479 AbstractCegarLoop]: Abstraction has 733 states and 965 transitions. [2020-07-20 17:59:03,351 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-07-20 17:59:03,351 INFO L276 IsEmpty]: Start isEmpty. Operand 733 states and 965 transitions. [2020-07-20 17:59:03,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1083 [2020-07-20 17:59:03,363 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:03,363 INFO L422 BasicCegarLoop]: trace histogram [141, 141, 141, 140, 140, 140, 140, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:03,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:03,564 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:03,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:03,565 INFO L82 PathProgramCache]: Analyzing trace with hash 2076739844, now seen corresponding path program 42 times [2020-07-20 17:59:03,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:03,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [238320584] [2020-07-20 17:59:03,566 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 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 46 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:03,822 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:59:03,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:03,827 INFO L263 TraceCheckSpWp]: Trace formula consists of 1629 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 17:59:03,834 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:05,832 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 33195 proven. 3949 refuted. 0 times theorem prover too weak. 35362 trivial. 0 not checked. [2020-07-20 17:59:05,832 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:09,514 INFO L134 CoverageAnalysis]: Checked inductivity of 72506 backedges. 15505 proven. 14169 refuted. 0 times theorem prover too weak. 42832 trivial. 0 not checked. [2020-07-20 17:59:09,515 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [238320584] [2020-07-20 17:59:09,515 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:09,515 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 44 [2020-07-20 17:59:09,515 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [329936923] [2020-07-20 17:59:09,516 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-07-20 17:59:09,516 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:09,516 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-07-20 17:59:09,517 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=399, Invalid=1493, Unknown=0, NotChecked=0, Total=1892 [2020-07-20 17:59:09,517 INFO L87 Difference]: Start difference. First operand 733 states and 965 transitions. Second operand 44 states. [2020-07-20 17:59:23,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:23,452 INFO L93 Difference]: Finished difference Result 1089 states and 1476 transitions. [2020-07-20 17:59:23,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2020-07-20 17:59:23,455 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 1082 [2020-07-20 17:59:23,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:23,460 INFO L225 Difference]: With dead ends: 1089 [2020-07-20 17:59:23,460 INFO L226 Difference]: Without dead ends: 804 [2020-07-20 17:59:23,463 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2281 GetRequests, 2121 SyntacticMatches, 6 SemanticMatches, 154 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6334 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=6718, Invalid=17462, Unknown=0, NotChecked=0, Total=24180 [2020-07-20 17:59:23,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 804 states. [2020-07-20 17:59:23,614 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 804 to 785. [2020-07-20 17:59:23,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 785 states. [2020-07-20 17:59:23,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 785 states to 785 states and 1040 transitions. [2020-07-20 17:59:23,616 INFO L78 Accepts]: Start accepts. Automaton has 785 states and 1040 transitions. Word has length 1082 [2020-07-20 17:59:23,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:23,616 INFO L479 AbstractCegarLoop]: Abstraction has 785 states and 1040 transitions. [2020-07-20 17:59:23,616 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-07-20 17:59:23,617 INFO L276 IsEmpty]: Start isEmpty. Operand 785 states and 1040 transitions. [2020-07-20 17:59:23,626 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1090 [2020-07-20 17:59:23,626 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:23,627 INFO L422 BasicCegarLoop]: trace histogram [142, 142, 142, 141, 141, 141, 141, 22, 21, 21, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:23,839 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:23,840 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:23,840 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:23,841 INFO L82 PathProgramCache]: Analyzing trace with hash -690954159, now seen corresponding path program 43 times [2020-07-20 17:59:23,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:23,842 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1082322762] [2020-07-20 17:59:23,842 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 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 47 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:24,106 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:59:24,106 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:24,111 INFO L263 TraceCheckSpWp]: Trace formula consists of 1640 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 17:59:24,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:25,491 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 8101 proven. 22805 refuted. 0 times theorem prover too weak. 42605 trivial. 0 not checked. [2020-07-20 17:59:25,491 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:28,482 INFO L134 CoverageAnalysis]: Checked inductivity of 73511 backedges. 3860 proven. 22806 refuted. 0 times theorem prover too weak. 46845 trivial. 0 not checked. [2020-07-20 17:59:28,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1082322762] [2020-07-20 17:59:28,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:28,483 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 30 [2020-07-20 17:59:28,483 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [634541038] [2020-07-20 17:59:28,484 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-07-20 17:59:28,484 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:28,484 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-07-20 17:59:28,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=183, Invalid=687, Unknown=0, NotChecked=0, Total=870 [2020-07-20 17:59:28,485 INFO L87 Difference]: Start difference. First operand 785 states and 1040 transitions. Second operand 30 states. [2020-07-20 17:59:40,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:40,356 INFO L93 Difference]: Finished difference Result 1691 states and 2300 transitions. [2020-07-20 17:59:40,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 105 states. [2020-07-20 17:59:40,359 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 1089 [2020-07-20 17:59:40,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:40,366 INFO L225 Difference]: With dead ends: 1691 [2020-07-20 17:59:40,366 INFO L226 Difference]: Without dead ends: 1390 [2020-07-20 17:59:40,368 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2275 GetRequests, 2141 SyntacticMatches, 8 SemanticMatches, 126 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6349 ImplicationChecksByTransitivity, 9.7s TimeCoverageRelationStatistics Valid=3306, Invalid=12950, Unknown=0, NotChecked=0, Total=16256 [2020-07-20 17:59:40,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1390 states. [2020-07-20 17:59:40,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1390 to 984. [2020-07-20 17:59:40,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 984 states. [2020-07-20 17:59:40,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 984 states to 984 states and 1300 transitions. [2020-07-20 17:59:40,566 INFO L78 Accepts]: Start accepts. Automaton has 984 states and 1300 transitions. Word has length 1089 [2020-07-20 17:59:40,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:40,567 INFO L479 AbstractCegarLoop]: Abstraction has 984 states and 1300 transitions. [2020-07-20 17:59:40,567 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-07-20 17:59:40,567 INFO L276 IsEmpty]: Start isEmpty. Operand 984 states and 1300 transitions. [2020-07-20 17:59:40,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2020-07-20 17:59:40,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:40,577 INFO L422 BasicCegarLoop]: trace histogram [148, 148, 148, 147, 147, 147, 147, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:40,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:40,778 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:40,779 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:40,779 INFO L82 PathProgramCache]: Analyzing trace with hash -944230286, now seen corresponding path program 44 times [2020-07-20 17:59:40,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:40,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2045186151] [2020-07-20 17:59:40,780 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 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 48 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:41,052 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:59:41,052 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:41,057 INFO L263 TraceCheckSpWp]: Trace formula consists of 1706 conjuncts, 17 conjunts are in the unsatisfiable core [2020-07-20 17:59:41,065 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:42,327 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 34637 proven. 2618 refuted. 0 times theorem prover too weak. 42652 trivial. 0 not checked. [2020-07-20 17:59:42,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:45,526 INFO L134 CoverageAnalysis]: Checked inductivity of 79907 backedges. 26747 proven. 2618 refuted. 0 times theorem prover too weak. 50542 trivial. 0 not checked. [2020-07-20 17:59:45,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2045186151] [2020-07-20 17:59:45,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:45,527 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18] total 27 [2020-07-20 17:59:45,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [495673413] [2020-07-20 17:59:45,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 17:59:45,528 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:45,528 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 17:59:45,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=534, Unknown=0, NotChecked=0, Total=702 [2020-07-20 17:59:45,528 INFO L87 Difference]: Start difference. First operand 984 states and 1300 transitions. Second operand 27 states. [2020-07-20 17:59:50,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 17:59:50,686 INFO L93 Difference]: Finished difference Result 1307 states and 1759 transitions. [2020-07-20 17:59:50,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-07-20 17:59:50,689 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 1134 [2020-07-20 17:59:50,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 17:59:50,694 INFO L225 Difference]: With dead ends: 1307 [2020-07-20 17:59:50,694 INFO L226 Difference]: Without dead ends: 810 [2020-07-20 17:59:50,696 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2319 GetRequests, 2242 SyntacticMatches, 7 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1055 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=1491, Invalid=3621, Unknown=0, NotChecked=0, Total=5112 [2020-07-20 17:59:50,696 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 810 states. [2020-07-20 17:59:50,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 810 to 810. [2020-07-20 17:59:50,846 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 810 states. [2020-07-20 17:59:50,848 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 810 states to 810 states and 1070 transitions. [2020-07-20 17:59:50,848 INFO L78 Accepts]: Start accepts. Automaton has 810 states and 1070 transitions. Word has length 1134 [2020-07-20 17:59:50,848 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 17:59:50,848 INFO L479 AbstractCegarLoop]: Abstraction has 810 states and 1070 transitions. [2020-07-20 17:59:50,849 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 17:59:50,849 INFO L276 IsEmpty]: Start isEmpty. Operand 810 states and 1070 transitions. [2020-07-20 17:59:50,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1142 [2020-07-20 17:59:50,858 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 17:59:50,858 INFO L422 BasicCegarLoop]: trace histogram [149, 149, 149, 148, 148, 148, 148, 23, 22, 22, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 17:59:51,059 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:51,059 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 17:59:51,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 17:59:51,060 INFO L82 PathProgramCache]: Analyzing trace with hash -211111029, now seen corresponding path program 45 times [2020-07-20 17:59:51,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 17:59:51,061 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1075578066] [2020-07-20 17:59:51,061 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 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 49 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 17:59:51,319 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 17:59:51,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 17:59:51,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 1717 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 17:59:51,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 17:59:53,001 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 7593 proven. 26378 refuted. 0 times theorem prover too weak. 46991 trivial. 0 not checked. [2020-07-20 17:59:53,001 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 17:59:56,495 INFO L134 CoverageAnalysis]: Checked inductivity of 80962 backedges. 3658 proven. 26379 refuted. 0 times theorem prover too weak. 50925 trivial. 0 not checked. [2020-07-20 17:59:56,496 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1075578066] [2020-07-20 17:59:56,496 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 17:59:56,496 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 34 [2020-07-20 17:59:56,497 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718661665] [2020-07-20 17:59:56,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-07-20 17:59:56,499 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 17:59:56,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-07-20 17:59:56,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=221, Invalid=901, Unknown=0, NotChecked=0, Total=1122 [2020-07-20 17:59:56,499 INFO L87 Difference]: Start difference. First operand 810 states and 1070 transitions. Second operand 34 states. [2020-07-20 17:59:59,866 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:00:02,920 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:00:03,306 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:00:03,498 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:00:06,809 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:00:07,224 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:00:07,425 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:00:07,618 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:00:07,829 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:00:12,999 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:00:13,292 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:00:13,565 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:00:13,822 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:00:14,072 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:00:14,319 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:00:14,549 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:00:14,800 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 18:00:19,212 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 18:00:19,829 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:00:20,097 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:00:20,364 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:00:20,614 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:00:20,870 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:00:21,105 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:00:21,326 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:00:21,526 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:00:22,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:00:22,599 INFO L93 Difference]: Finished difference Result 1330 states and 1815 transitions. [2020-07-20 18:00:22,602 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 161 states. [2020-07-20 18:00:22,603 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 1141 [2020-07-20 18:00:22,604 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:00:22,608 INFO L225 Difference]: With dead ends: 1330 [2020-07-20 18:00:22,608 INFO L226 Difference]: Without dead ends: 1019 [2020-07-20 18:00:22,613 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2435 GetRequests, 2241 SyntacticMatches, 8 SemanticMatches, 186 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14972 ImplicationChecksByTransitivity, 21.2s TimeCoverageRelationStatistics Valid=6712, Invalid=28444, Unknown=0, NotChecked=0, Total=35156 [2020-07-20 18:00:22,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1019 states. [2020-07-20 18:00:22,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1019 to 837. [2020-07-20 18:00:22,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-20 18:00:22,786 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1106 transitions. [2020-07-20 18:00:22,786 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1106 transitions. Word has length 1141 [2020-07-20 18:00:22,787 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:00:22,787 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1106 transitions. [2020-07-20 18:00:22,787 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-07-20 18:00:22,787 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1106 transitions. [2020-07-20 18:00:22,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1194 [2020-07-20 18:00:22,798 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:00:22,798 INFO L422 BasicCegarLoop]: trace histogram [156, 156, 156, 155, 155, 155, 155, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:00:22,999 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 49 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:00:22,999 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:00:23,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:00:23,001 INFO L82 PathProgramCache]: Analyzing trace with hash -2061681211, now seen corresponding path program 46 times [2020-07-20 18:00:23,001 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:00:23,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1599236300] [2020-07-20 18:00:23,001 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 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 50 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:00:23,281 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:00:23,282 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:00:23,289 INFO L263 TraceCheckSpWp]: Trace formula consists of 1794 conjuncts, 19 conjunts are in the unsatisfiable core [2020-07-20 18:00:23,297 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:00:24,927 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 38517 proven. 3198 refuted. 0 times theorem prover too weak. 47058 trivial. 0 not checked. [2020-07-20 18:00:24,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:00:29,240 INFO L134 CoverageAnalysis]: Checked inductivity of 88773 backedges. 27160 proven. 6185 refuted. 0 times theorem prover too weak. 55428 trivial. 0 not checked. [2020-07-20 18:00:29,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1599236300] [2020-07-20 18:00:29,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:00:29,241 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20] total 31 [2020-07-20 18:00:29,241 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1124787664] [2020-07-20 18:00:29,242 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 18:00:29,242 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:00:29,242 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 18:00:29,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=213, Invalid=717, Unknown=0, NotChecked=0, Total=930 [2020-07-20 18:00:29,242 INFO L87 Difference]: Start difference. First operand 837 states and 1106 transitions. Second operand 31 states. [2020-07-20 18:00:39,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:00:39,259 INFO L93 Difference]: Finished difference Result 1138 states and 1536 transitions. [2020-07-20 18:00:39,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 73 states. [2020-07-20 18:00:39,264 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 1193 [2020-07-20 18:00:39,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:00:39,269 INFO L225 Difference]: With dead ends: 1138 [2020-07-20 18:00:39,269 INFO L226 Difference]: Without dead ends: 837 [2020-07-20 18:00:39,271 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2457 GetRequests, 2356 SyntacticMatches, 7 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=2584, Invalid=6536, Unknown=0, NotChecked=0, Total=9120 [2020-07-20 18:00:39,272 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 837 states. [2020-07-20 18:00:39,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 837 to 837. [2020-07-20 18:00:39,426 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 837 states. [2020-07-20 18:00:39,427 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 837 states to 837 states and 1104 transitions. [2020-07-20 18:00:39,428 INFO L78 Accepts]: Start accepts. Automaton has 837 states and 1104 transitions. Word has length 1193 [2020-07-20 18:00:39,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:00:39,429 INFO L479 AbstractCegarLoop]: Abstraction has 837 states and 1104 transitions. [2020-07-20 18:00:39,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-07-20 18:00:39,429 INFO L276 IsEmpty]: Start isEmpty. Operand 837 states and 1104 transitions. [2020-07-20 18:00:39,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1201 [2020-07-20 18:00:39,441 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:00:39,441 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 157, 156, 156, 156, 156, 24, 23, 23, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:00:39,641 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:00:39,642 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:00:39,642 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:00:39,643 INFO L82 PathProgramCache]: Analyzing trace with hash 1739494104, now seen corresponding path program 47 times [2020-07-20 18:00:39,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:00:39,644 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [75000289] [2020-07-20 18:00:39,644 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 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 51 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:00:39,969 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:00:39,969 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:00:39,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 1802 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 18:00:39,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:00:42,075 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 7019 proven. 30608 refuted. 0 times theorem prover too weak. 52258 trivial. 0 not checked. [2020-07-20 18:00:42,075 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:00:46,657 INFO L134 CoverageAnalysis]: Checked inductivity of 89885 backedges. 3430 proven. 30609 refuted. 0 times theorem prover too weak. 55846 trivial. 0 not checked. [2020-07-20 18:00:46,658 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [75000289] [2020-07-20 18:00:46,658 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:00:46,658 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 38 [2020-07-20 18:00:46,658 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965927578] [2020-07-20 18:00:46,659 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-07-20 18:00:46,659 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:00:46,660 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-07-20 18:00:46,660 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=1141, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 18:00:46,660 INFO L87 Difference]: Start difference. First operand 837 states and 1104 transitions. Second operand 38 states. [2020-07-20 18:00:48,382 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-20 18:00:48,637 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:00:48,852 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:00:49,063 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 23 [2020-07-20 18:00:50,489 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-20 18:00:50,733 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:00:50,940 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:00:51,152 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:00:51,366 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:00:51,771 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 21 [2020-07-20 18:00:52,048 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:00:52,305 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-20 18:00:52,554 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 18:00:52,804 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:00:53,072 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 23 [2020-07-20 18:00:54,946 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:00:55,212 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:00:55,443 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:00:55,662 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:00:55,878 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:00:56,104 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:00:56,518 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 18:00:56,801 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:00:57,069 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:00:57,330 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:00:57,578 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:00:57,816 WARN L193 SmtUtils]: Spent 118.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:00:58,090 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:01:01,723 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:01:02,011 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:01:02,293 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:01:02,533 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:01:02,763 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:01:02,986 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:01:03,225 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:01:03,687 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 18:01:03,989 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:01:04,266 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:01:04,547 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:01:04,813 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:01:05,070 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:01:05,320 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:01:05,581 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 18:01:12,225 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:01:12,542 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:01:12,814 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:01:13,091 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:01:13,346 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:01:13,598 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:01:13,840 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:01:14,095 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 18:01:14,591 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 18:01:14,932 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:01:15,257 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:01:15,584 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:01:15,900 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:01:16,203 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:01:16,480 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:01:16,753 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:01:17,046 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:01:22,323 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 23 [2020-07-20 18:01:22,643 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:01:22,941 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 18:01:23,257 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:01:23,554 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:01:23,835 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:01:24,102 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:01:24,362 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 18:01:24,625 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-20 18:01:25,099 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-20 18:01:25,750 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:01:26,048 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 18:01:26,360 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 18:01:26,648 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:01:26,938 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:01:27,209 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:01:27,471 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 18:01:27,736 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:01:27,967 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:01:28,475 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:01:29,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:01:29,177 INFO L93 Difference]: Finished difference Result 1314 states and 1782 transitions. [2020-07-20 18:01:29,181 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 200 states. [2020-07-20 18:01:29,182 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 1200 [2020-07-20 18:01:29,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:01:29,188 INFO L225 Difference]: With dead ends: 1314 [2020-07-20 18:01:29,188 INFO L226 Difference]: Without dead ends: 1000 [2020-07-20 18:01:29,195 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2592 GetRequests, 2355 SyntacticMatches, 8 SemanticMatches, 229 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23317 ImplicationChecksByTransitivity, 35.0s TimeCoverageRelationStatistics Valid=9982, Invalid=43148, Unknown=0, NotChecked=0, Total=53130 [2020-07-20 18:01:29,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1000 states. [2020-07-20 18:01:29,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1000 to 867. [2020-07-20 18:01:29,362 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-20 18:01:29,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1144 transitions. [2020-07-20 18:01:29,364 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1144 transitions. Word has length 1200 [2020-07-20 18:01:29,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:01:29,365 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1144 transitions. [2020-07-20 18:01:29,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-07-20 18:01:29,365 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1144 transitions. [2020-07-20 18:01:29,377 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1260 [2020-07-20 18:01:29,377 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:01:29,377 INFO L422 BasicCegarLoop]: trace histogram [165, 165, 165, 164, 164, 164, 164, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:01:29,578 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:01:29,579 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:01:29,579 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:01:29,580 INFO L82 PathProgramCache]: Analyzing trace with hash -891846805, now seen corresponding path program 48 times [2020-07-20 18:01:29,580 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:01:29,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1332635092] [2020-07-20 18:01:29,581 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 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 52 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:01:29,875 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:01:29,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:01:29,882 INFO L263 TraceCheckSpWp]: Trace formula consists of 1890 conjuncts, 21 conjunts are in the unsatisfiable core [2020-07-20 18:01:29,891 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:01:32,029 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 43091 proven. 3850 refuted. 0 times theorem prover too weak. 52334 trivial. 0 not checked. [2020-07-20 18:01:32,030 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:01:37,344 INFO L134 CoverageAnalysis]: Checked inductivity of 99275 backedges. 27808 proven. 10223 refuted. 0 times theorem prover too weak. 61244 trivial. 0 not checked. [2020-07-20 18:01:37,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1332635092] [2020-07-20 18:01:37,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:01:37,345 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22] total 35 [2020-07-20 18:01:37,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682680489] [2020-07-20 18:01:37,346 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-07-20 18:01:37,346 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:01:37,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-07-20 18:01:37,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=264, Invalid=926, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 18:01:37,346 INFO L87 Difference]: Start difference. First operand 867 states and 1144 transitions. Second operand 35 states. [2020-07-20 18:01:51,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:01:51,313 INFO L93 Difference]: Finished difference Result 1168 states and 1573 transitions. [2020-07-20 18:01:51,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2020-07-20 18:01:51,318 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 1259 [2020-07-20 18:01:51,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:01:51,324 INFO L225 Difference]: With dead ends: 1168 [2020-07-20 18:01:51,324 INFO L226 Difference]: Without dead ends: 867 [2020-07-20 18:01:51,326 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2609 GetRequests, 2484 SyntacticMatches, 7 SemanticMatches, 118 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3533 ImplicationChecksByTransitivity, 11.5s TimeCoverageRelationStatistics Valid=3982, Invalid=10298, Unknown=0, NotChecked=0, Total=14280 [2020-07-20 18:01:51,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2020-07-20 18:01:51,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 867. [2020-07-20 18:01:51,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 867 states. [2020-07-20 18:01:51,497 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 1142 transitions. [2020-07-20 18:01:51,498 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 1142 transitions. Word has length 1259 [2020-07-20 18:01:51,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:01:51,499 INFO L479 AbstractCegarLoop]: Abstraction has 867 states and 1142 transitions. [2020-07-20 18:01:51,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-07-20 18:01:51,499 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 1142 transitions. [2020-07-20 18:01:51,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1267 [2020-07-20 18:01:51,511 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:01:51,512 INFO L422 BasicCegarLoop]: trace histogram [166, 166, 166, 165, 165, 165, 165, 25, 24, 24, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:01:51,719 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:01:51,720 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:01:51,720 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:01:51,721 INFO L82 PathProgramCache]: Analyzing trace with hash -1524872590, now seen corresponding path program 49 times [2020-07-20 18:01:51,721 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:01:51,722 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [104495825] [2020-07-20 18:01:51,722 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 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 53 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:01:52,027 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:01:52,027 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:01:52,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 1901 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 18:01:52,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:01:54,821 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 6358 proven. 35576 refuted. 0 times theorem prover too weak. 58517 trivial. 0 not checked. [2020-07-20 18:01:54,821 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:02:00,592 INFO L134 CoverageAnalysis]: Checked inductivity of 100451 backedges. 3167 proven. 35577 refuted. 0 times theorem prover too weak. 61707 trivial. 0 not checked. [2020-07-20 18:02:00,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [104495825] [2020-07-20 18:02:00,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:02:00,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 42 [2020-07-20 18:02:00,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [130658890] [2020-07-20 18:02:00,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-07-20 18:02:00,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:02:00,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-07-20 18:02:00,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=315, Invalid=1407, Unknown=0, NotChecked=0, Total=1722 [2020-07-20 18:02:00,595 INFO L87 Difference]: Start difference. First operand 867 states and 1142 transitions. Second operand 42 states. [2020-07-20 18:02:02,661 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:02:02,923 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:03,184 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:03,447 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:02:04,766 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 18:02:05,025 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:02:05,308 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:02:05,563 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:05,800 WARN L193 SmtUtils]: Spent 131.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:06,069 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:02:06,581 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 21 [2020-07-20 18:02:06,905 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:02:07,202 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 22 [2020-07-20 18:02:07,480 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 18:02:07,747 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:08,003 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 23 [2020-07-20 18:02:09,857 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:02:10,149 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:02:10,399 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:10,647 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:10,908 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:02:11,198 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:02:11,740 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 18:02:12,060 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:02:12,372 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:02:12,665 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:12,966 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:13,244 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:13,516 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:02:14,007 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 18:02:14,351 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:14,657 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:02:14,965 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:02:15,262 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:15,556 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:15,836 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:16,143 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 18:02:18,448 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:18,761 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:02:19,053 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:19,327 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:02:19,589 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:19,853 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:02:20,144 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 18:02:20,718 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 18:02:21,074 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:21,389 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:02:21,731 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:22,053 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:22,376 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:22,664 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:22,956 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 18:02:23,181 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 18:02:23,522 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 18:02:23,918 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:02:24,298 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:24,650 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:02:25,020 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:25,365 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:02:25,689 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:26,022 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:02:26,363 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:02:32,056 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:32,370 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:32,694 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:33,016 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:02:33,323 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:02:33,606 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:33,911 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:02:34,222 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 18:02:34,865 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 18:02:35,284 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:02:35,669 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:36,030 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:36,399 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:02:36,758 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:02:37,094 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:37,430 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:02:37,758 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:02:38,030 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-20 18:02:38,409 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 18:02:38,831 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:02:39,269 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:02:39,676 WARN L193 SmtUtils]: Spent 160.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:02:40,070 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:40,474 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:40,840 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:02:41,208 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:02:41,559 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:02:41,927 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:02:48,900 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:02:49,285 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:02:49,703 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:02:50,077 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 18:02:50,419 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:02:50,749 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:02:51,062 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:02:51,356 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 18:02:51,658 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:02:51,977 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-20 18:02:52,636 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 22 [2020-07-20 18:02:53,036 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:02:53,430 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 23 [2020-07-20 18:02:53,810 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2020-07-20 18:02:54,174 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:02:54,556 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 18:02:54,977 WARN L193 SmtUtils]: Spent 151.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:02:55,300 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 23 [2020-07-20 18:02:55,623 WARN L193 SmtUtils]: Spent 145.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 18:02:55,934 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 24 [2020-07-20 18:02:56,184 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:02:56,546 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-20 18:02:57,404 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:02:57,784 WARN L193 SmtUtils]: Spent 144.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 18:02:58,166 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 18:02:58,539 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:02:58,911 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:02:59,270 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:02:59,611 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 18:02:59,959 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:03:00,303 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:03:00,588 WARN L193 SmtUtils]: Spent 165.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:03:01,238 WARN L193 SmtUtils]: Spent 150.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:03:02,043 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:03:02,044 INFO L93 Difference]: Finished difference Result 1301 states and 1754 transitions. [2020-07-20 18:03:02,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 223 states. [2020-07-20 18:03:02,050 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 1266 [2020-07-20 18:03:02,051 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:03:02,055 INFO L225 Difference]: With dead ends: 1301 [2020-07-20 18:03:02,055 INFO L226 Difference]: Without dead ends: 984 [2020-07-20 18:03:02,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2747 GetRequests, 2483 SyntacticMatches, 8 SemanticMatches, 256 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29010 ImplicationChecksByTransitivity, 50.8s TimeCoverageRelationStatistics Valid=12036, Invalid=54270, Unknown=0, NotChecked=0, Total=66306 [2020-07-20 18:03:02,060 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 984 states. [2020-07-20 18:03:02,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 984 to 900. [2020-07-20 18:03:02,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-20 18:03:02,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1186 transitions. [2020-07-20 18:03:02,242 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1186 transitions. Word has length 1266 [2020-07-20 18:03:02,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:03:02,243 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1186 transitions. [2020-07-20 18:03:02,243 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-07-20 18:03:02,243 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1186 transitions. [2020-07-20 18:03:02,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1333 [2020-07-20 18:03:02,259 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:03:02,260 INFO L422 BasicCegarLoop]: trace histogram [175, 175, 175, 174, 174, 174, 174, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:03:02,460 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:03:02,461 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:03:02,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:03:02,462 INFO L82 PathProgramCache]: Analyzing trace with hash -719015028, now seen corresponding path program 50 times [2020-07-20 18:03:02,463 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:03:02,463 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1506236045] [2020-07-20 18:03:02,463 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 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 54 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:03:02,768 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:03:02,768 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:03:02,776 INFO L263 TraceCheckSpWp]: Trace formula consists of 1997 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-20 18:03:02,786 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:03:05,518 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 48431 proven. 4583 refuted. 0 times theorem prover too weak. 58591 trivial. 0 not checked. [2020-07-20 18:03:05,518 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:03:12,409 INFO L134 CoverageAnalysis]: Checked inductivity of 111605 backedges. 28763 proven. 14741 refuted. 0 times theorem prover too weak. 68101 trivial. 0 not checked. [2020-07-20 18:03:12,410 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1506236045] [2020-07-20 18:03:12,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:03:12,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24] total 39 [2020-07-20 18:03:12,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710507395] [2020-07-20 18:03:12,411 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-07-20 18:03:12,411 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:03:12,412 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-07-20 18:03:12,412 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=321, Invalid=1161, Unknown=0, NotChecked=0, Total=1482 [2020-07-20 18:03:12,412 INFO L87 Difference]: Start difference. First operand 900 states and 1186 transitions. Second operand 39 states. [2020-07-20 18:03:35,868 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:03:35,868 INFO L93 Difference]: Finished difference Result 1201 states and 1614 transitions. [2020-07-20 18:03:35,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2020-07-20 18:03:35,875 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 1332 [2020-07-20 18:03:35,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:03:35,883 INFO L225 Difference]: With dead ends: 1201 [2020-07-20 18:03:35,883 INFO L226 Difference]: Without dead ends: 900 [2020-07-20 18:03:35,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2776 GetRequests, 2626 SyntacticMatches, 7 SemanticMatches, 143 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5475 ImplicationChecksByTransitivity, 18.4s TimeCoverageRelationStatistics Valid=5748, Invalid=15132, Unknown=0, NotChecked=0, Total=20880 [2020-07-20 18:03:35,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 900 states. [2020-07-20 18:03:36,066 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 900 to 900. [2020-07-20 18:03:36,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 900 states. [2020-07-20 18:03:36,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 900 states to 900 states and 1184 transitions. [2020-07-20 18:03:36,069 INFO L78 Accepts]: Start accepts. Automaton has 900 states and 1184 transitions. Word has length 1332 [2020-07-20 18:03:36,070 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:03:36,070 INFO L479 AbstractCegarLoop]: Abstraction has 900 states and 1184 transitions. [2020-07-20 18:03:36,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-07-20 18:03:36,070 INFO L276 IsEmpty]: Start isEmpty. Operand 900 states and 1184 transitions. [2020-07-20 18:03:36,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1340 [2020-07-20 18:03:36,083 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:03:36,084 INFO L422 BasicCegarLoop]: trace histogram [176, 176, 176, 175, 175, 175, 175, 26, 25, 25, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:03:36,284 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:03:36,285 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:03:36,285 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:03:36,286 INFO L82 PathProgramCache]: Analyzing trace with hash -78422223, now seen corresponding path program 51 times [2020-07-20 18:03:36,287 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:03:36,287 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1309044584] [2020-07-20 18:03:36,287 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 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 55 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:03:36,606 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:03:36,606 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:03:36,615 INFO L263 TraceCheckSpWp]: Trace formula consists of 2008 conjuncts, 27 conjunts are in the unsatisfiable core [2020-07-20 18:03:36,626 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:03:40,199 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 5589 proven. 41372 refuted. 0 times theorem prover too weak. 65891 trivial. 0 not checked. [2020-07-20 18:03:40,200 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:03:48,111 INFO L134 CoverageAnalysis]: Checked inductivity of 112852 backedges. 2860 proven. 41373 refuted. 0 times theorem prover too weak. 68619 trivial. 0 not checked. [2020-07-20 18:03:48,112 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1309044584] [2020-07-20 18:03:48,112 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:03:48,112 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28] total 46 [2020-07-20 18:03:48,112 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484297487] [2020-07-20 18:03:48,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-07-20 18:03:48,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:03:48,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-07-20 18:03:48,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=371, Invalid=1699, Unknown=0, NotChecked=0, Total=2070 [2020-07-20 18:03:48,115 INFO L87 Difference]: Start difference. First operand 900 states and 1184 transitions. Second operand 46 states. [2020-07-20 18:03:49,148 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-20 18:03:49,399 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 18:03:49,724 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-20 18:03:49,946 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:03:50,364 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 18:03:50,655 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:03:50,981 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:03:51,267 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:03:51,533 WARN L193 SmtUtils]: Spent 172.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:03:51,756 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 18:03:52,004 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 18:03:53,469 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:03:53,798 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:03:54,088 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:03:54,363 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:03:54,666 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:03:54,893 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 18:03:55,231 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:03:55,619 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:03:55,979 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:03:56,316 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:03:56,645 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:03:56,998 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:03:57,282 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 18:03:57,569 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 18:03:57,942 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-20 18:03:58,421 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-20 18:03:58,650 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:03:58,892 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 18:03:59,346 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:03:59,711 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:04:00,041 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:00,357 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:00,656 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:00,965 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:04:01,224 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 18:04:01,574 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:01,997 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:04:02,376 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:04:02,725 WARN L193 SmtUtils]: Spent 181.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:04:03,075 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:03,409 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:03,770 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 18:04:04,083 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 18:04:04,488 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 22 [2020-07-20 18:04:04,936 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:05,370 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:04:05,818 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:04:06,217 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:04:06,592 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:06,936 WARN L193 SmtUtils]: Spent 183.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:07,283 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 18:04:07,568 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 18:04:07,897 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 18:04:08,293 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 18:04:08,597 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 18:04:08,845 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:04:09,103 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 18:04:09,353 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 18:04:09,623 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 18:04:09,915 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-20 18:04:10,292 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:10,721 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:04:11,090 WARN L193 SmtUtils]: Spent 169.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:11,409 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:11,739 WARN L193 SmtUtils]: Spent 184.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:12,048 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 26 [2020-07-20 18:04:12,354 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 26 [2020-07-20 18:04:12,769 WARN L193 SmtUtils]: Spent 170.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:13,175 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:13,551 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:04:13,909 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:14,265 WARN L193 SmtUtils]: Spent 171.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:14,600 WARN L193 SmtUtils]: Spent 167.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:14,908 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:04:15,273 WARN L193 SmtUtils]: Spent 175.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 18:04:15,613 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-20 18:04:16,057 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:04:16,550 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:04:17,031 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:17,516 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:04:17,984 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:18,423 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:18,844 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:19,203 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:04:19,583 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:04:19,869 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-20 18:04:20,309 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:04:20,822 WARN L193 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:04:21,353 WARN L193 SmtUtils]: Spent 202.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:04:21,827 WARN L193 SmtUtils]: Spent 191.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:22,307 WARN L193 SmtUtils]: Spent 190.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:04:22,771 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:23,221 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:23,638 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:04:24,034 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:24,482 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:04:24,851 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 18:04:25,234 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 18:04:25,735 WARN L193 SmtUtils]: Spent 125.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:04:26,041 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 18:04:26,311 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 18:04:26,584 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 18:04:26,853 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 18:04:27,119 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 18:04:27,421 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 18:04:27,745 WARN L193 SmtUtils]: Spent 123.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 20 [2020-07-20 18:04:28,173 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:28,623 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:29,041 WARN L193 SmtUtils]: Spent 194.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:29,448 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:04:29,845 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 26 [2020-07-20 18:04:30,215 WARN L193 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:30,562 WARN L193 SmtUtils]: Spent 198.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2020-07-20 18:04:30,948 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 26 [2020-07-20 18:04:31,237 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-20 18:04:31,684 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:32,189 WARN L193 SmtUtils]: Spent 199.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:04:32,661 WARN L193 SmtUtils]: Spent 188.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:33,085 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:33,514 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:33,916 WARN L193 SmtUtils]: Spent 178.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:34,290 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:04:34,654 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:35,053 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 18:04:35,398 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-20 18:04:35,870 WARN L193 SmtUtils]: Spent 177.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:04:36,375 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:04:36,849 WARN L193 SmtUtils]: Spent 176.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:04:37,328 WARN L193 SmtUtils]: Spent 201.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:37,828 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:38,321 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:38,790 WARN L193 SmtUtils]: Spent 193.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:39,228 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:04:39,677 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:40,096 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:04:40,427 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 18:04:40,932 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:04:41,555 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:04:42,106 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:04:42,691 WARN L193 SmtUtils]: Spent 205.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:04:43,225 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:04:43,769 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:44,300 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:04:44,796 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:04:45,270 WARN L193 SmtUtils]: Spent 211.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:45,722 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:04:46,224 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:04:46,634 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 18:04:53,462 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 18:04:53,797 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 18:04:54,096 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 18:04:54,388 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 18:04:54,668 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 18:04:54,946 WARN L193 SmtUtils]: Spent 116.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 18:04:55,223 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 18:04:55,517 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-20 18:04:55,840 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 18:04:56,309 WARN L193 SmtUtils]: Spent 185.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:04:56,774 WARN L193 SmtUtils]: Spent 189.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:04:57,224 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:04:57,655 WARN L193 SmtUtils]: Spent 187.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:04:58,064 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-20 18:04:58,465 WARN L193 SmtUtils]: Spent 196.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-20 18:04:58,846 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:04:59,213 WARN L193 SmtUtils]: Spent 179.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-20 18:04:59,576 WARN L193 SmtUtils]: Spent 182.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 26 [2020-07-20 18:04:59,855 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:05:00,315 WARN L193 SmtUtils]: Spent 192.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:05:00,823 WARN L193 SmtUtils]: Spent 200.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:05:01,342 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:05:01,878 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 18:05:02,404 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:05:02,909 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:05:03,382 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 18:05:03,828 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:05:04,257 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:05:04,697 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-20 18:05:05,075 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 18:05:05,673 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 23 [2020-07-20 18:05:06,320 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:05:06,902 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:05:07,483 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:05:08,056 WARN L193 SmtUtils]: Spent 217.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 18:05:08,613 WARN L193 SmtUtils]: Spent 207.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:05:09,160 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:05:09,695 WARN L193 SmtUtils]: Spent 215.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 18:05:10,195 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:05:10,672 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:05:11,123 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-20 18:05:11,504 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 21 [2020-07-20 18:05:12,016 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 23 [2020-07-20 18:05:12,333 WARN L193 SmtUtils]: Spent 134.00 ms on a formula simplification. DAG size of input: 24 DAG size of output: 18 [2020-07-20 18:05:12,646 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-20 18:05:13,306 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:05:13,882 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:05:14,445 WARN L193 SmtUtils]: Spent 216.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:05:14,984 WARN L193 SmtUtils]: Spent 204.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:05:15,507 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:05:16,033 WARN L193 SmtUtils]: Spent 210.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:05:16,539 WARN L193 SmtUtils]: Spent 212.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 24 [2020-07-20 18:05:17,019 WARN L193 SmtUtils]: Spent 206.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:05:17,498 WARN L193 SmtUtils]: Spent 208.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:05:17,956 WARN L193 SmtUtils]: Spent 213.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:05:18,363 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 26 [2020-07-20 18:05:19,413 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 25 [2020-07-20 18:05:20,735 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:05:20,736 INFO L93 Difference]: Finished difference Result 1308 states and 1759 transitions. [2020-07-20 18:05:20,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 247 states. [2020-07-20 18:05:20,744 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 1339 [2020-07-20 18:05:20,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:05:20,752 INFO L225 Difference]: With dead ends: 1308 [2020-07-20 18:05:20,752 INFO L226 Difference]: Without dead ends: 988 [2020-07-20 18:05:20,760 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2917 GetRequests, 2625 SyntacticMatches, 8 SemanticMatches, 284 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36074 ImplicationChecksByTransitivity, 77.7s TimeCoverageRelationStatistics Valid=15121, Invalid=66389, Unknown=0, NotChecked=0, Total=81510 [2020-07-20 18:05:20,761 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 988 states. [2020-07-20 18:05:20,959 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 988 to 936. [2020-07-20 18:05:20,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 936 states. [2020-07-20 18:05:20,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 936 states to 936 states and 1232 transitions. [2020-07-20 18:05:20,963 INFO L78 Accepts]: Start accepts. Automaton has 936 states and 1232 transitions. Word has length 1339 [2020-07-20 18:05:20,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:05:20,964 INFO L479 AbstractCegarLoop]: Abstraction has 936 states and 1232 transitions. [2020-07-20 18:05:20,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-07-20 18:05:20,964 INFO L276 IsEmpty]: Start isEmpty. Operand 936 states and 1232 transitions. [2020-07-20 18:05:20,978 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1413 [2020-07-20 18:05:20,979 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:05:20,979 INFO L422 BasicCegarLoop]: trace histogram [186, 186, 186, 185, 185, 185, 185, 27, 26, 26, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:05:21,180 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:05:21,180 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:05:21,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:05:21,182 INFO L82 PathProgramCache]: Analyzing trace with hash 2025630034, now seen corresponding path program 52 times [2020-07-20 18:05:21,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:05:21,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [226312460] [2020-07-20 18:05:21,183 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 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 56 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:05:21,534 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:05:21,534 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:05:21,544 INFO L263 TraceCheckSpWp]: Trace formula consists of 2115 conjuncts, 25 conjunts are in the unsatisfiable core [2020-07-20 18:05:21,557 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:05:25,336 INFO L134 CoverageAnalysis]: Checked inductivity of 125976 backedges. 54618 proven. 5406 refuted. 0 times theorem prover too weak. 65952 trivial. 0 not checked. [2020-07-20 18:05:25,336 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:05:35,701 INFO L134 CoverageAnalysis]: Checked inductivity of 125976 backedges. 30106 proven. 19748 refuted. 0 times theorem prover too weak. 76122 trivial. 0 not checked. [2020-07-20 18:05:35,701 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [226312460] [2020-07-20 18:05:35,701 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:05:35,702 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26] total 43 [2020-07-20 18:05:35,702 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1968499938] [2020-07-20 18:05:35,703 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-07-20 18:05:35,703 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:05:35,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-07-20 18:05:35,704 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=1422, Unknown=0, NotChecked=0, Total=1806 [2020-07-20 18:05:35,704 INFO L87 Difference]: Start difference. First operand 936 states and 1232 transitions. Second operand 43 states. [2020-07-20 18:06:07,477 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification. DAG size of input: 18 DAG size of output: 17 [2020-07-20 18:06:10,707 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 18:06:10,707 INFO L93 Difference]: Finished difference Result 1237 states and 1659 transitions. [2020-07-20 18:06:10,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 140 states. [2020-07-20 18:06:10,716 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 1412 [2020-07-20 18:06:10,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 18:06:10,723 INFO L225 Difference]: With dead ends: 1237 [2020-07-20 18:06:10,723 INFO L226 Difference]: Without dead ends: 936 [2020-07-20 18:06:10,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2959 GetRequests, 2782 SyntacticMatches, 7 SemanticMatches, 170 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8065 ImplicationChecksByTransitivity, 29.9s TimeCoverageRelationStatistics Valid=8039, Invalid=21373, Unknown=0, NotChecked=0, Total=29412 [2020-07-20 18:06:10,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 936 states. [2020-07-20 18:06:10,932 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 936 to 887. [2020-07-20 18:06:10,932 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 887 states. [2020-07-20 18:06:10,934 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 887 states to 887 states and 1159 transitions. [2020-07-20 18:06:10,935 INFO L78 Accepts]: Start accepts. Automaton has 887 states and 1159 transitions. Word has length 1412 [2020-07-20 18:06:10,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 18:06:10,936 INFO L479 AbstractCegarLoop]: Abstraction has 887 states and 1159 transitions. [2020-07-20 18:06:10,936 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-07-20 18:06:10,936 INFO L276 IsEmpty]: Start isEmpty. Operand 887 states and 1159 transitions. [2020-07-20 18:06:10,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1420 [2020-07-20 18:06:10,953 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 18:06:10,953 INFO L422 BasicCegarLoop]: trace histogram [187, 187, 187, 186, 186, 186, 186, 27, 26, 26, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 18:06:11,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 56 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:06:11,155 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 18:06:11,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 18:06:11,156 INFO L82 PathProgramCache]: Analyzing trace with hash 1207336619, now seen corresponding path program 53 times [2020-07-20 18:06:11,156 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 18:06:11,156 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1448918484] [2020-07-20 18:06:11,157 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 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 57 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 18:06:11,511 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 18:06:11,511 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 18:06:11,523 INFO L263 TraceCheckSpWp]: Trace formula consists of 2126 conjuncts, 29 conjunts are in the unsatisfiable core [2020-07-20 18:06:11,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 18:06:16,068 INFO L134 CoverageAnalysis]: Checked inductivity of 127301 backedges. 4691 proven. 48095 refuted. 0 times theorem prover too weak. 74515 trivial. 0 not checked. [2020-07-20 18:06:16,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 18:06:26,955 INFO L134 CoverageAnalysis]: Checked inductivity of 127301 backedges. 2500 proven. 48096 refuted. 0 times theorem prover too weak. 76705 trivial. 0 not checked. [2020-07-20 18:06:26,955 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1448918484] [2020-07-20 18:06:26,955 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 18:06:26,956 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 50 [2020-07-20 18:06:26,956 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1790998458] [2020-07-20 18:06:26,957 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-07-20 18:06:26,957 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 18:06:26,957 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-07-20 18:06:26,958 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=433, Invalid=2017, Unknown=0, NotChecked=0, Total=2450 [2020-07-20 18:06:26,958 INFO L87 Difference]: Start difference. First operand 887 states and 1159 transitions. Second operand 50 states. [2020-07-20 18:06:27,654 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:06:27,977 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 18:06:28,303 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 18:06:28,621 WARN L193 SmtUtils]: Spent 159.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 18:06:29,050 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-20 18:06:29,362 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:06:29,648 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 18:06:30,014 WARN L193 SmtUtils]: Spent 186.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 18:06:30,465 WARN L193 SmtUtils]: Spent 273.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:06:30,942 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:06:31,379 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:06:31,850 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:06:32,208 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-20 18:06:32,537 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 18:06:32,989 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 18:06:33,335 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:06:33,733 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 18:06:34,111 WARN L193 SmtUtils]: Spent 180.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-20 18:06:34,581 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:06:35,073 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:06:35,519 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:06:35,971 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:06:36,432 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:06:36,829 WARN L193 SmtUtils]: Spent 147.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 18 [2020-07-20 18:06:37,320 WARN L193 SmtUtils]: Spent 218.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:06:37,787 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:06:38,226 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:06:38,656 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:06:39,067 WARN L193 SmtUtils]: Spent 219.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:06:39,453 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:06:39,757 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 18:06:40,118 WARN L193 SmtUtils]: Spent 154.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 18:06:40,558 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:06:40,890 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 18:06:41,163 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 18:06:41,440 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:06:41,735 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 18:06:42,340 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:06:42,830 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:06:43,268 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:06:43,700 WARN L193 SmtUtils]: Spent 234.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:06:44,109 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 26 [2020-07-20 18:06:44,546 WARN L193 SmtUtils]: Spent 214.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 26 [2020-07-20 18:06:44,951 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 18:06:45,472 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:06:46,043 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:06:46,503 WARN L193 SmtUtils]: Spent 225.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:06:46,960 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:06:47,402 WARN L193 SmtUtils]: Spent 231.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:06:47,833 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:06:48,267 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 18:06:48,625 WARN L193 SmtUtils]: Spent 161.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-20 18:06:49,114 WARN L193 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:06:49,675 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:06:50,224 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:06:50,725 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:06:51,239 WARN L193 SmtUtils]: Spent 257.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:06:51,728 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:06:52,179 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:06:52,687 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 18:06:53,111 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 19 [2020-07-20 18:06:53,521 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 25 DAG size of output: 18 [2020-07-20 18:06:54,037 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-20 18:06:54,430 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:06:54,757 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:06:55,099 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 16 [2020-07-20 18:06:55,437 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:06:55,772 WARN L193 SmtUtils]: Spent 143.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-20 18:06:56,154 WARN L193 SmtUtils]: Spent 158.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 18:06:56,653 WARN L193 SmtUtils]: Spent 237.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:06:57,177 WARN L193 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:06:57,631 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:06:58,099 WARN L193 SmtUtils]: Spent 245.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:06:58,549 WARN L193 SmtUtils]: Spent 233.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:06:58,999 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:06:59,502 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 18:07:00,221 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:00,831 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:07:01,374 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:07:01,841 WARN L193 SmtUtils]: Spent 209.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:02,315 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:07:02,788 WARN L193 SmtUtils]: Spent 244.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:03,215 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:07:03,634 WARN L193 SmtUtils]: Spent 226.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 18:07:03,968 WARN L193 SmtUtils]: Spent 157.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 21 [2020-07-20 18:07:04,455 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:05,038 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 23 [2020-07-20 18:07:05,576 WARN L193 SmtUtils]: Spent 221.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:07:06,103 WARN L193 SmtUtils]: Spent 229.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:07:06,627 WARN L193 SmtUtils]: Spent 248.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:07:07,138 WARN L193 SmtUtils]: Spent 232.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:07:07,639 WARN L193 SmtUtils]: Spent 238.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 24 [2020-07-20 18:07:08,153 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:08,664 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 24 [2020-07-20 18:07:09,079 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 18:07:09,691 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:07:10,396 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:07:11,088 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:07:11,759 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:12,398 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:07:13,021 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:13,595 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:14,159 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:07:14,695 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:15,202 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:07:15,608 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 26 DAG size of output: 20 [2020-07-20 18:07:16,079 WARN L193 SmtUtils]: Spent 166.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 22 [2020-07-20 18:07:16,631 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 17 [2020-07-20 18:07:17,074 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 18:07:17,455 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 18:07:17,804 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 18:07:18,161 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 17 [2020-07-20 18:07:18,479 WARN L193 SmtUtils]: Spent 139.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 18:07:18,839 WARN L193 SmtUtils]: Spent 149.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 18:07:19,251 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 22 [2020-07-20 18:07:19,796 WARN L193 SmtUtils]: Spent 243.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:20,363 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:20,878 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 26 [2020-07-20 18:07:21,404 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:21,903 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:07:22,370 WARN L193 SmtUtils]: Spent 246.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2020-07-20 18:07:22,855 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2020-07-20 18:07:23,367 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2020-07-20 18:07:23,792 WARN L193 SmtUtils]: Spent 156.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 19 [2020-07-20 18:07:24,428 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:25,120 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:07:25,763 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:26,411 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:26,993 WARN L193 SmtUtils]: Spent 242.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:27,484 WARN L193 SmtUtils]: Spent 241.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:07:27,999 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:07:28,506 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:28,998 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 18:07:29,655 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:30,347 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:07:30,984 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:07:31,565 WARN L193 SmtUtils]: Spent 240.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:32,139 WARN L193 SmtUtils]: Spent 239.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:32,750 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:33,333 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:33,906 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:34,414 WARN L193 SmtUtils]: Spent 235.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:34,988 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 25 [2020-07-20 18:07:35,493 WARN L193 SmtUtils]: Spent 155.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 20 [2020-07-20 18:07:36,161 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:36,954 WARN L193 SmtUtils]: Spent 268.00 ms on a formula simplification. DAG size of input: 35 DAG size of output: 26 [2020-07-20 18:07:37,697 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:07:38,411 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:07:39,098 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:39,792 WARN L193 SmtUtils]: Spent 270.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:40,440 WARN L193 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:41,066 WARN L193 SmtUtils]: Spent 277.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2020-07-20 18:07:41,682 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 26 [2020-07-20 18:07:42,269 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 26 [2020-07-20 18:07:42,809 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 26 [2020-07-20 18:07:43,234 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 21 [2020-07-20 18:07:43,865 WARN L193 SmtUtils]: Spent 263.00 ms on a formula simplification. DAG size of input: 31 DAG size of output: 23 [2020-07-20 18:07:44,641 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:07:45,372 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:07:46,092 WARN L193 SmtUtils]: Spent 249.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 24 [2020-07-20 18:07:46,794 WARN L193 SmtUtils]: Spent 262.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:07:47,502 WARN L193 SmtUtils]: Spent 279.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:48,199 WARN L193 SmtUtils]: Spent 259.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 24 [2020-07-20 18:07:48,835 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:07:49,473 WARN L193 SmtUtils]: Spent 281.00 ms on a formula simplification. DAG size of input: 34 DAG size of output: 25 [2020-07-20 18:07:50,064 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:50,635 WARN L193 SmtUtils]: Spent 269.00 ms on a formula simplification. DAG size of input: 33 DAG size of output: 25 [2020-07-20 18:07:51,227 WARN L193 SmtUtils]: Spent 272.00 ms on a formula simplification. DAG size of input: 32 DAG size of output: 25 [2020-07-20 18:07:51,685 WARN L193 SmtUtils]: Spent 137.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 18 [2020-07-20 18:07:52,250 WARN L193 SmtUtils]: Spent 146.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 18:07:52,667 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 18:07:53,126 WARN L193 SmtUtils]: Spent 132.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 18:07:53,463 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 18:07:53,837 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 17 [2020-07-20 18:07:54,207 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 18 [2020-07-20 18:07:54,549 WARN L193 SmtUtils]: Spent 133.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 17 [2020-07-20 18:07:54,878 WARN L193 SmtUtils]: Spent 136.00 ms on a formula simplification. DAG size of input: 21 DAG size of output: 18 [2020-07-20 18:07:55,215 WARN L193 SmtUtils]: Spent 124.00 ms on a formula simplification. DAG size of input: 20 DAG size of output: 18 [2020-07-20 18:07:55,598 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-20 18:07:56,133 WARN L193 SmtUtils]: Spent 224.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:07:56,700 WARN L193 SmtUtils]: Spent 223.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:07:57,228 WARN L193 SmtUtils]: Spent 222.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-20 18:07:57,764 WARN L193 SmtUtils]: Spent 220.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:07:58,400 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-20 18:07:58,929 WARN L193 SmtUtils]: Spent 252.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:07:59,441 WARN L193 SmtUtils]: Spent 236.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-20 18:07:59,940 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 26 [2020-07-20 18:08:00,502 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 26 [2020-07-20 18:08:00,957 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification. DAG size of input: 22 DAG size of output: 19 [2020-07-20 18:08:01,680 WARN L193 SmtUtils]: Spent 253.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:08:02,418 WARN L193 SmtUtils]: Spent 247.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:08:03,117 WARN L193 SmtUtils]: Spent 260.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:08:03,789 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:08:04,458 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:08:05,106 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:08:05,694 WARN L193 SmtUtils]: Spent 251.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:08:06,312 WARN L193 SmtUtils]: Spent 280.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:08:06,888 WARN L193 SmtUtils]: Spent 254.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:08:07,424 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-20 18:08:07,846 WARN L193 SmtUtils]: Spent 173.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 22 [2020-07-20 18:08:08,532 WARN L193 SmtUtils]: Spent 286.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:08:09,316 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:08:10,101 WARN L193 SmtUtils]: Spent 275.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:08:10,837 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:08:11,580 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 18:08:12,287 WARN L193 SmtUtils]: Spent 250.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:08:12,955 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 24 [2020-07-20 18:08:13,571 WARN L193 SmtUtils]: Spent 266.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:08:14,172 WARN L193 SmtUtils]: Spent 255.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:08:14,744 WARN L193 SmtUtils]: Spent 265.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 25 [2020-07-20 18:08:15,373 WARN L193 SmtUtils]: Spent 256.00 ms on a formula simplification. DAG size of input: 27 DAG size of output: 25 [2020-07-20 18:08:15,909 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification. DAG size of input: 23 DAG size of output: 20 [2020-07-20 18:08:16,684 WARN L193 SmtUtils]: Spent 261.00 ms on a formula simplification. DAG size of input: 28 DAG size of output: 24 [2020-07-20 18:08:17,488 WARN L193 SmtUtils]: Spent 264.00 ms on a formula simplification. DAG size of input: 30 DAG size of output: 26 [2020-07-20 18:08:18,274 WARN L193 SmtUtils]: Spent 267.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25 [2020-07-20 18:08:19,087 WARN L193 SmtUtils]: Spent 258.00 ms on a formula simplification. DAG size of input: 29 DAG size of output: 25