/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic DAGSIZE --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 19:30:10,705 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 19:30:10,707 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 19:30:10,720 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 19:30:10,721 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 19:30:10,722 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 19:30:10,723 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 19:30:10,725 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 19:30:10,727 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 19:30:10,728 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 19:30:10,729 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 19:30:10,730 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 19:30:10,730 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 19:30:10,731 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 19:30:10,732 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 19:30:10,733 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 19:30:10,734 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 19:30:10,735 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 19:30:10,737 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 19:30:10,739 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 19:30:10,740 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 19:30:10,741 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 19:30:10,743 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 19:30:10,743 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 19:30:10,746 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 19:30:10,754 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 19:30:10,755 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 19:30:10,756 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 19:30:10,757 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 19:30:10,772 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 19:30:10,772 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 19:30:10,774 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 19:30:10,774 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 19:30:10,774 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 19:30:10,774 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 19:30:10,774 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 19:30:10,775 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 19:30:10,775 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 19:30:10,775 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 19:30:10,775 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 19:30:10,775 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 19:30:10,776 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 19:30:10,776 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 19:30:10,776 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 19:30:10,776 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 19:30:10,776 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 19:30:10,777 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 19:30:10,777 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 19:30:10,777 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 19:30:10,777 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 19:30:10,777 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:30:10,778 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 19:30:10,778 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 19:30:10,778 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 19:30:10,778 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 19:30:10,778 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:10,778 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 19:30:10,779 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 19:30:10,779 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> DAGSIZE Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 19:30:11,072 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 19:30:11,094 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 19:30:11,098 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 19:30:11,101 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 19:30:11,102 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 19:30:11,103 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-21 19:30:11,183 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e0c94f71/255867fc7c99407d86df9e72a0cf2a7b/FLAGd83738613 [2020-07-21 19:30:11,710 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 19:30:11,710 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_25-1.c [2020-07-21 19:30:11,720 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e0c94f71/255867fc7c99407d86df9e72a0cf2a7b/FLAGd83738613 [2020-07-21 19:30:12,089 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/1e0c94f71/255867fc7c99407d86df9e72a0cf2a7b [2020-07-21 19:30:12,100 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 19:30:12,104 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 19:30:12,105 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 19:30:12,106 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 19:30:12,110 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 19:30:12,112 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:30:12" (1/1) ... [2020-07-21 19:30:12,117 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4e909a3b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:12, skipping insertion in model container [2020-07-21 19:30:12,118 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 07:30:12" (1/1) ... [2020-07-21 19:30:12,128 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 19:30:12,147 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 19:30:12,322 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:30:12,327 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 19:30:12,344 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 19:30:12,361 INFO L208 MainTranslator]: Completed translation [2020-07-21 19:30:12,362 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:12 WrapperNode [2020-07-21 19:30:12,362 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 19:30:12,363 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 19:30:12,363 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 19:30:12,363 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 19:30:12,379 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:12" (1/1) ... [2020-07-21 19:30:12,379 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:12" (1/1) ... [2020-07-21 19:30:12,386 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:12" (1/1) ... [2020-07-21 19:30:12,386 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:12" (1/1) ... [2020-07-21 19:30:12,390 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:12" (1/1) ... [2020-07-21 19:30:12,393 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:12" (1/1) ... [2020-07-21 19:30:12,394 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:12" (1/1) ... [2020-07-21 19:30:12,396 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 19:30:12,396 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 19:30:12,397 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 19:30:12,397 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 19:30:12,398 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:12" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 19:30:12,566 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 19:30:12,567 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 19:30:12,567 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-21 19:30:12,567 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 19:30:12,567 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-21 19:30:12,567 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 19:30:12,568 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-21 19:30:12,568 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 19:30:12,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 19:30:12,568 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 19:30:12,752 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 19:30:12,752 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-21 19:30:12,757 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:30:12 BoogieIcfgContainer [2020-07-21 19:30:12,757 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 19:30:12,759 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 19:30:12,759 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 19:30:12,763 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 19:30:12,763 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 07:30:12" (1/3) ... [2020-07-21 19:30:12,779 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b85b536 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:30:12, skipping insertion in model container [2020-07-21 19:30:12,780 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 07:30:12" (2/3) ... [2020-07-21 19:30:12,781 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1b85b536 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 07:30:12, skipping insertion in model container [2020-07-21 19:30:12,782 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 07:30:12" (3/3) ... [2020-07-21 19:30:12,787 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_25-1.c [2020-07-21 19:30:12,821 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 19:30:12,847 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 19:30:12,863 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 19:30:12,893 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 19:30:12,894 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 19:30:12,894 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 19:30:12,894 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 19:30:12,894 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 19:30:12,894 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 19:30:12,895 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 19:30:12,895 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 19:30:12,916 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-21 19:30:12,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-21 19:30:12,924 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:12,925 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:12,926 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:12,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:12,933 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-21 19:30:12,951 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:12,952 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [592199321] [2020-07-21 19:30:12,952 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:13,038 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:30:13,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:13,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:30:13,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:13,137 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:30:13,137 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:30:13,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [592199321] [2020-07-21 19:30:13,139 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:30:13,139 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:30:13,140 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222249110] [2020-07-21 19:30:13,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:30:13,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:13,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:30:13,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:30:13,161 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-21 19:30:13,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:13,270 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-21 19:30:13,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:30:13,272 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-21 19:30:13,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:13,283 INFO L225 Difference]: With dead ends: 35 [2020-07-21 19:30:13,284 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 19:30:13,288 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:30:13,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 19:30:13,335 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 19:30:13,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:30:13,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:30:13,341 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-21 19:30:13,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:13,341 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:30:13,341 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:30:13,342 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:30:13,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 19:30:13,344 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:13,344 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:13,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:13,556 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:13,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:13,557 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-21 19:30:13,557 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:13,558 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [136394131] [2020-07-21 19:30:13,558 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:13,580 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:30:13,580 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:13,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 21 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-21 19:30:13,582 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:13,619 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 19:30:13,619 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 19:30:13,620 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [136394131] [2020-07-21 19:30:13,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 19:30:13,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-21 19:30:13,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [838414154] [2020-07-21 19:30:13,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-21 19:30:13,623 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:13,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-21 19:30:13,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-21 19:30:13,624 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-21 19:30:13,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:13,687 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-21 19:30:13,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-21 19:30:13,688 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-21 19:30:13,688 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:13,689 INFO L225 Difference]: With dead ends: 27 [2020-07-21 19:30:13,689 INFO L226 Difference]: Without dead ends: 23 [2020-07-21 19:30:13,691 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-07-21 19:30:13,691 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-21 19:30:13,697 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-21 19:30:13,698 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 19:30:13,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-21 19:30:13,699 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-21 19:30:13,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:13,700 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-21 19:30:13,700 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-21 19:30:13,700 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-21 19:30:13,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-21 19:30:13,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:13,702 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:13,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:13,915 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:13,916 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:13,917 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-21 19:30:13,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:13,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1109276908] [2020-07-21 19:30:13,918 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:13,950 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:30:13,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:13,952 INFO L263 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:30:13,954 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:14,045 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-21 19:30:14,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:14,281 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:14,327 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:30:14,328 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1109276908] [2020-07-21 19:30:14,328 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:14,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:30:14,329 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [669879709] [2020-07-21 19:30:14,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:30:14,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:14,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:30:14,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:30:14,331 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-21 19:30:14,445 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:14,445 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-21 19:30:14,446 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:30:14,446 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-21 19:30:14,447 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:14,448 INFO L225 Difference]: With dead ends: 32 [2020-07-21 19:30:14,449 INFO L226 Difference]: Without dead ends: 28 [2020-07-21 19:30:14,450 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 41 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:30:14,450 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-21 19:30:14,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-21 19:30:14,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:30:14,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:30:14,460 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-21 19:30:14,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:14,461 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:30:14,461 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:30:14,461 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:30:14,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-21 19:30:14,463 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:14,463 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:14,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:14,678 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:14,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:14,679 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-21 19:30:14,680 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:14,680 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [510607343] [2020-07-21 19:30:14,681 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:14,711 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 1 check-sat command(s) [2020-07-21 19:30:14,712 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:14,713 INFO L263 TraceCheckSpWp]: Trace formula consists of 40 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-21 19:30:14,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:14,758 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-21 19:30:14,759 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:14,896 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:14,929 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-21 19:30:14,929 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [510607343] [2020-07-21 19:30:14,929 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:14,930 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-21 19:30:14,930 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410403613] [2020-07-21 19:30:14,930 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-21 19:30:14,931 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:14,931 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-21 19:30:14,931 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-21 19:30:14,932 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-21 19:30:15,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:15,021 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-21 19:30:15,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-21 19:30:15,022 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-21 19:30:15,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:15,024 INFO L225 Difference]: With dead ends: 37 [2020-07-21 19:30:15,025 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 19:30:15,025 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 44 SyntacticMatches, 4 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:30:15,026 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 19:30:15,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-21 19:30:15,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-21 19:30:15,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-21 19:30:15,035 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-21 19:30:15,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:15,036 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-21 19:30:15,036 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-21 19:30:15,036 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-21 19:30:15,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-21 19:30:15,038 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:15,038 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:15,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:15,252 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:15,253 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:15,253 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-21 19:30:15,253 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:15,254 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [57680715] [2020-07-21 19:30:15,254 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:15,290 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:15,291 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:15,292 INFO L263 TraceCheckSpWp]: Trace formula consists of 89 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:30:15,294 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:15,338 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-21 19:30:15,338 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:15,586 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:15,588 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:15,653 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:15,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:15,709 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:30:15,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [57680715] [2020-07-21 19:30:15,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:15,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:30:15,711 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320891957] [2020-07-21 19:30:15,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:30:15,712 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:15,712 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:30:15,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:30:15,712 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-21 19:30:15,881 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:15,881 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-21 19:30:15,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:30:15,882 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-21 19:30:15,882 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:15,884 INFO L225 Difference]: With dead ends: 42 [2020-07-21 19:30:15,884 INFO L226 Difference]: Without dead ends: 38 [2020-07-21 19:30:15,885 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 64 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:30:15,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-21 19:30:15,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-21 19:30:15,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:30:15,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:30:15,897 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-21 19:30:15,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:15,897 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:30:15,897 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:30:15,898 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:30:15,899 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-21 19:30:15,900 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:15,900 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:16,107 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:16,109 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:16,110 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:16,110 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-21 19:30:16,110 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:16,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1876227934] [2020-07-21 19:30:16,111 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:16,145 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:16,145 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:16,147 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-21 19:30:16,149 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:16,204 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-21 19:30:16,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:16,457 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:16,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:16,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:16,556 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-21 19:30:16,557 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1876227934] [2020-07-21 19:30:16,557 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:16,558 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-21 19:30:16,558 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287998205] [2020-07-21 19:30:16,558 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-21 19:30:16,559 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:16,559 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-21 19:30:16,559 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-21 19:30:16,559 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-21 19:30:16,703 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:16,703 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-21 19:30:16,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 19:30:16,704 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-21 19:30:16,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:16,707 INFO L225 Difference]: With dead ends: 47 [2020-07-21 19:30:16,707 INFO L226 Difference]: Without dead ends: 43 [2020-07-21 19:30:16,708 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 68 SyntacticMatches, 6 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=59, Invalid=123, Unknown=0, NotChecked=0, Total=182 [2020-07-21 19:30:16,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-21 19:30:16,717 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-21 19:30:16,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-21 19:30:16,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-21 19:30:16,719 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-21 19:30:16,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:16,720 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-21 19:30:16,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-21 19:30:16,720 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-21 19:30:16,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-21 19:30:16,722 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:16,722 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 5, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:16,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:16,934 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:16,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:16,935 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-21 19:30:16,936 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:16,936 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1047065877] [2020-07-21 19:30:16,937 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:16,982 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:16,982 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:16,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 147 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:30:16,987 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:17,036 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-21 19:30:17,036 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:17,494 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:17,591 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:17,593 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:17,639 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:17,640 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:17,678 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-21 19:30:17,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1047065877] [2020-07-21 19:30:17,679 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:17,679 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:30:17,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930737979] [2020-07-21 19:30:17,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:30:17,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:17,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:30:17,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:30:17,681 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-21 19:30:17,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:17,845 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-21 19:30:17,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:30:17,846 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-21 19:30:17,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:17,848 INFO L225 Difference]: With dead ends: 52 [2020-07-21 19:30:17,849 INFO L226 Difference]: Without dead ends: 48 [2020-07-21 19:30:17,850 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 134 GetRequests, 111 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:30:17,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-21 19:30:17,861 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-21 19:30:17,861 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:30:17,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:30:17,863 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-21 19:30:17,863 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:17,864 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:30:17,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:30:17,864 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:30:17,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-21 19:30:17,867 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:17,868 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 11, 6, 6, 6, 6, 6, 6, 6, 5, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:18,082 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:18,083 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:18,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:18,083 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-21 19:30:18,084 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:18,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1458156653] [2020-07-21 19:30:18,084 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:18,142 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:18,143 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:18,144 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-21 19:30:18,148 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:18,216 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-21 19:30:18,216 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:18,656 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:18,775 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:18,776 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:18,821 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:18,858 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-21 19:30:18,859 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1458156653] [2020-07-21 19:30:18,859 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:18,859 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-21 19:30:18,859 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [944090259] [2020-07-21 19:30:18,860 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-21 19:30:18,860 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:18,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-21 19:30:18,861 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-21 19:30:18,861 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-21 19:30:18,998 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:18,998 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-21 19:30:18,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-21 19:30:18,999 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-21 19:30:18,999 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:19,001 INFO L225 Difference]: With dead ends: 57 [2020-07-21 19:30:19,001 INFO L226 Difference]: Without dead ends: 53 [2020-07-21 19:30:19,002 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:30:19,003 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-21 19:30:19,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-21 19:30:19,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-21 19:30:19,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-21 19:30:19,015 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-21 19:30:19,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:19,016 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-21 19:30:19,016 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-21 19:30:19,016 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-21 19:30:19,019 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-21 19:30:19,019 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:19,019 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 9, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:19,234 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:19,235 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:19,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:19,236 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-21 19:30:19,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:19,238 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [764463353] [2020-07-21 19:30:19,238 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:19,310 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:19,310 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:19,312 INFO L263 TraceCheckSpWp]: Trace formula consists of 263 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:30:19,316 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:19,416 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-21 19:30:19,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:20,001 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:20,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:20,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:20,272 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:20,337 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:20,395 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-21 19:30:20,395 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [764463353] [2020-07-21 19:30:20,396 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:20,396 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:30:20,396 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493399088] [2020-07-21 19:30:20,397 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:30:20,397 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:20,397 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:30:20,398 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:30:20,398 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-21 19:30:20,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:20,697 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-21 19:30:20,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:30:20,697 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-21 19:30:20,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:20,701 INFO L225 Difference]: With dead ends: 62 [2020-07-21 19:30:20,701 INFO L226 Difference]: Without dead ends: 58 [2020-07-21 19:30:20,702 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 211 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:30:20,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-21 19:30:20,713 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-21 19:30:20,714 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:30:20,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:30:20,716 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-21 19:30:20,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:20,717 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:30:20,717 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:30:20,717 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:30:20,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-21 19:30:20,721 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:20,721 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 21, 13, 13, 13, 13, 13, 13, 13, 8, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:20,934 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:20,935 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:20,936 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:20,936 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-21 19:30:20,937 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:20,937 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473905737] [2020-07-21 19:30:20,938 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:21,028 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:21,029 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:21,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-21 19:30:21,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:21,125 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-21 19:30:21,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:21,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,063 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,148 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,149 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,198 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,199 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:22,257 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-21 19:30:22,257 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473905737] [2020-07-21 19:30:22,257 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:22,258 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-21 19:30:22,258 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186376447] [2020-07-21 19:30:22,259 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-21 19:30:22,259 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:22,259 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-21 19:30:22,260 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-21 19:30:22,260 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-21 19:30:22,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:22,453 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-21 19:30:22,453 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-21 19:30:22,453 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-21 19:30:22,454 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:22,456 INFO L225 Difference]: With dead ends: 67 [2020-07-21 19:30:22,456 INFO L226 Difference]: Without dead ends: 63 [2020-07-21 19:30:22,458 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-21 19:30:22,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-21 19:30:22,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-21 19:30:22,467 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-21 19:30:22,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-21 19:30:22,469 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-21 19:30:22,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:22,469 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-21 19:30:22,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-21 19:30:22,470 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-21 19:30:22,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-21 19:30:22,474 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:22,474 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 22, 21, 21, 21, 21, 21, 21, 21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:22,689 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:22,690 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:22,691 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:22,691 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-21 19:30:22,692 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:22,692 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1214461720] [2020-07-21 19:30:22,692 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:22,819 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:22,820 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:22,822 INFO L263 TraceCheckSpWp]: Trace formula consists of 640 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:30:22,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:22,936 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-21 19:30:22,936 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:24,138 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:24,464 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:24,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:24,724 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:24,769 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:24,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:24,861 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-21 19:30:24,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1214461720] [2020-07-21 19:30:24,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:24,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 19:30:24,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473804486] [2020-07-21 19:30:24,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:30:24,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:24,864 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:30:24,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:30:24,864 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-21 19:30:25,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:25,068 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-21 19:30:25,068 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:30:25,069 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-21 19:30:25,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:25,073 INFO L225 Difference]: With dead ends: 72 [2020-07-21 19:30:25,073 INFO L226 Difference]: Without dead ends: 68 [2020-07-21 19:30:25,075 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 578 GetRequests, 545 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:30:25,075 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-21 19:30:25,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-21 19:30:25,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:30:25,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 19:30:25,097 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-21 19:30:25,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:25,100 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 19:30:25,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:30:25,100 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 19:30:25,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2020-07-21 19:30:25,107 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:25,107 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 35, 21, 21, 21, 21, 21, 21, 21, 14, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:25,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:25,323 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:25,324 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:25,324 INFO L82 PathProgramCache]: Analyzing trace with hash -1101007572, now seen corresponding path program 5 times [2020-07-21 19:30:25,324 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:25,325 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [720972055] [2020-07-21 19:30:25,325 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:25,459 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:25,459 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:25,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 668 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-21 19:30:25,469 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:25,620 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1061 refuted. 0 times theorem prover too weak. 3827 trivial. 0 not checked. [2020-07-21 19:30:25,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:26,808 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:27,126 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:27,276 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:27,358 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:27,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:27,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:27,499 INFO L134 CoverageAnalysis]: Checked inductivity of 5047 backedges. 159 proven. 1101 refuted. 0 times theorem prover too weak. 3787 trivial. 0 not checked. [2020-07-21 19:30:27,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [720972055] [2020-07-21 19:30:27,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:27,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-21 19:30:27,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569608680] [2020-07-21 19:30:27,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-21 19:30:27,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:27,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-21 19:30:27,502 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-21 19:30:27,502 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-21 19:30:27,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:27,743 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-21 19:30:27,743 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-21 19:30:27,744 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 300 [2020-07-21 19:30:27,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:27,752 INFO L225 Difference]: With dead ends: 77 [2020-07-21 19:30:27,752 INFO L226 Difference]: Without dead ends: 73 [2020-07-21 19:30:27,753 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 605 GetRequests, 572 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:30:27,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-21 19:30:27,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-21 19:30:27,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-21 19:30:27,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-21 19:30:27,778 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 300 [2020-07-21 19:30:27,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:27,779 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-21 19:30:27,779 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-21 19:30:27,779 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-21 19:30:27,789 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2020-07-21 19:30:27,789 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:27,790 INFO L422 BasicCegarLoop]: trace histogram [71, 71, 36, 35, 35, 35, 35, 35, 35, 35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:28,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:28,005 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:28,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:28,006 INFO L82 PathProgramCache]: Analyzing trace with hash -897924696, now seen corresponding path program 6 times [2020-07-21 19:30:28,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:28,007 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [618798128] [2020-07-21 19:30:28,007 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:28,211 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:28,211 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:28,214 INFO L263 TraceCheckSpWp]: Trace formula consists of 1046 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:30:28,220 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:28,412 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 1995 refuted. 0 times theorem prover too weak. 10614 trivial. 0 not checked. [2020-07-21 19:30:28,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:30,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:30,806 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,059 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,261 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,345 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,395 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,396 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:31,535 INFO L134 CoverageAnalysis]: Checked inductivity of 12915 backedges. 306 proven. 2046 refuted. 0 times theorem prover too weak. 10563 trivial. 0 not checked. [2020-07-21 19:30:31,536 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [618798128] [2020-07-21 19:30:31,536 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:31,536 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 19:30:31,537 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435140922] [2020-07-21 19:30:31,537 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:30:31,538 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:31,538 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:30:31,538 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:30:31,538 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-21 19:30:31,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:31,893 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-21 19:30:31,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:30:31,893 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 468 [2020-07-21 19:30:31,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:31,899 INFO L225 Difference]: With dead ends: 82 [2020-07-21 19:30:31,899 INFO L226 Difference]: Without dead ends: 78 [2020-07-21 19:30:31,900 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 943 GetRequests, 905 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:30:31,900 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-21 19:30:31,911 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-21 19:30:31,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 19:30:31,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 19:30:31,914 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 468 [2020-07-21 19:30:31,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:31,915 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 19:30:31,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:30:31,915 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 19:30:31,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-21 19:30:31,919 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:31,919 INFO L422 BasicCegarLoop]: trace histogram [65, 65, 53, 32, 32, 32, 32, 32, 32, 32, 21, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:32,133 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:32,134 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:32,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:32,135 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-21 19:30:32,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:32,136 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1061833651] [2020-07-21 19:30:32,136 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:32,350 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:32,350 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:32,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 1001 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-21 19:30:32,362 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:32,537 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-21 19:30:32,537 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:34,245 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:34,911 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:34,912 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:35,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:35,255 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:35,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:35,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:35,493 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:35,542 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:35,662 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-21 19:30:35,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1061833651] [2020-07-21 19:30:35,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:35,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-21 19:30:35,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [105806936] [2020-07-21 19:30:35,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-21 19:30:35,665 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:35,665 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-21 19:30:35,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-21 19:30:35,665 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-21 19:30:36,148 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:36,149 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-21 19:30:36,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-21 19:30:36,150 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-21 19:30:36,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:36,155 INFO L225 Difference]: With dead ends: 87 [2020-07-21 19:30:36,155 INFO L226 Difference]: Without dead ends: 83 [2020-07-21 19:30:36,158 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 906 GetRequests, 868 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-21 19:30:36,159 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-21 19:30:36,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-21 19:30:36,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-21 19:30:36,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-21 19:30:36,189 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-21 19:30:36,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:36,190 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-21 19:30:36,190 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-21 19:30:36,190 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-21 19:30:36,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 872 [2020-07-21 19:30:36,201 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:36,202 INFO L422 BasicCegarLoop]: trace histogram [133, 133, 67, 66, 66, 66, 66, 66, 66, 66, 66, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:36,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:36,416 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:36,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:36,416 INFO L82 PathProgramCache]: Analyzing trace with hash -1701713687, now seen corresponding path program 7 times [2020-07-21 19:30:36,417 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:36,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [190732518] [2020-07-21 19:30:36,418 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:36,778 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:36,778 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:36,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 1945 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:30:36,794 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:37,315 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4406 refuted. 0 times theorem prover too weak. 40653 trivial. 0 not checked. [2020-07-21 19:30:37,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:40,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:40,075 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:41,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:42,011 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:42,012 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:42,346 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:42,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:42,507 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:42,508 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:42,600 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:42,601 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:42,654 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:43,033 INFO L134 CoverageAnalysis]: Checked inductivity of 45837 backedges. 778 proven. 4476 refuted. 0 times theorem prover too weak. 40583 trivial. 0 not checked. [2020-07-21 19:30:43,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [190732518] [2020-07-21 19:30:43,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:43,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 19:30:43,035 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682246238] [2020-07-21 19:30:43,036 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:30:43,036 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:43,036 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:30:43,037 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:30:43,037 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-21 19:30:43,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:43,438 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-21 19:30:43,438 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:30:43,438 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 871 [2020-07-21 19:30:43,440 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:43,443 INFO L225 Difference]: With dead ends: 92 [2020-07-21 19:30:43,443 INFO L226 Difference]: Without dead ends: 88 [2020-07-21 19:30:43,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1750 GetRequests, 1707 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:30:43,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-21 19:30:43,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-21 19:30:43,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 19:30:43,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 19:30:43,456 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 871 [2020-07-21 19:30:43,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:43,458 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 19:30:43,458 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:30:43,458 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 19:30:43,468 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1078 [2020-07-21 19:30:43,468 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:43,469 INFO L422 BasicCegarLoop]: trace histogram [157, 157, 128, 78, 78, 78, 78, 78, 78, 78, 50, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:43,683 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:43,684 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:43,684 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:43,685 INFO L82 PathProgramCache]: Analyzing trace with hash 860290653, now seen corresponding path program 7 times [2020-07-21 19:30:43,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:43,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1929489015] [2020-07-21 19:30:43,686 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:44,090 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:44,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:44,095 INFO L263 TraceCheckSpWp]: Trace formula consists of 2393 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-21 19:30:44,108 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:44,640 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5812 refuted. 0 times theorem prover too weak. 62481 trivial. 0 not checked. [2020-07-21 19:30:44,640 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:48,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:48,168 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:49,401 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:50,005 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:50,006 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:50,347 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:50,348 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:50,515 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:50,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:50,668 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:30:51,425 INFO L134 CoverageAnalysis]: Checked inductivity of 69124 backedges. 831 proven. 5889 refuted. 0 times theorem prover too weak. 62404 trivial. 0 not checked. [2020-07-21 19:30:51,426 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1929489015] [2020-07-21 19:30:51,426 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:30:51,426 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-21 19:30:51,427 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718925991] [2020-07-21 19:30:51,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-21 19:30:51,429 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:30:51,430 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-21 19:30:51,430 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-21 19:30:51,430 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-21 19:30:52,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:30:52,004 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-21 19:30:52,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-21 19:30:52,005 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1077 [2020-07-21 19:30:52,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:30:52,010 INFO L225 Difference]: With dead ends: 97 [2020-07-21 19:30:52,010 INFO L226 Difference]: Without dead ends: 93 [2020-07-21 19:30:52,011 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2161 GetRequests, 2118 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:30:52,012 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-21 19:30:52,023 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-21 19:30:52,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-21 19:30:52,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-21 19:30:52,025 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1077 [2020-07-21 19:30:52,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:30:52,027 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-21 19:30:52,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-21 19:30:52,027 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-21 19:30:52,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1574 [2020-07-21 19:30:52,049 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:30:52,050 INFO L422 BasicCegarLoop]: trace histogram [241, 241, 121, 120, 120, 120, 120, 120, 120, 120, 120, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:30:52,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:52,265 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:30:52,265 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:30:52,266 INFO L82 PathProgramCache]: Analyzing trace with hash 78333505, now seen corresponding path program 8 times [2020-07-21 19:30:52,266 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:30:52,266 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [988282977] [2020-07-21 19:30:52,267 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:30:52,847 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:30:52,847 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:30:52,854 INFO L263 TraceCheckSpWp]: Trace formula consists of 3511 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:30:52,873 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:30:53,883 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9337 refuted. 0 times theorem prover too weak. 140480 trivial. 0 not checked. [2020-07-21 19:30:53,883 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:30:58,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:01,114 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:02,359 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:02,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:02,902 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:03,278 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:03,279 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:03,487 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:03,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:03,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:03,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:03,629 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:04,533 INFO L134 CoverageAnalysis]: Checked inductivity of 151380 backedges. 1563 proven. 9429 refuted. 0 times theorem prover too weak. 140388 trivial. 0 not checked. [2020-07-21 19:31:04,533 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [988282977] [2020-07-21 19:31:04,534 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:04,534 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 19:31:04,534 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1484694983] [2020-07-21 19:31:04,536 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:31:04,537 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:04,537 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:31:04,539 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:31:04,539 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-21 19:31:05,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:05,297 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-21 19:31:05,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:31:05,298 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1573 [2020-07-21 19:31:05,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:05,304 INFO L225 Difference]: With dead ends: 102 [2020-07-21 19:31:05,304 INFO L226 Difference]: Without dead ends: 98 [2020-07-21 19:31:05,306 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3155 GetRequests, 3107 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:31:05,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-21 19:31:05,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-21 19:31:05,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 19:31:05,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 19:31:05,321 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1573 [2020-07-21 19:31:05,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:05,324 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 19:31:05,324 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:31:05,324 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 19:31:05,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1843 [2020-07-21 19:31:05,353 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:05,354 INFO L422 BasicCegarLoop]: trace histogram [269, 269, 221, 134, 134, 134, 134, 134, 134, 134, 87, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:05,567 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:05,568 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:05,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:05,568 INFO L82 PathProgramCache]: Analyzing trace with hash -323852785, now seen corresponding path program 8 times [2020-07-21 19:31:05,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:05,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112670671] [2020-07-21 19:31:05,569 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:06,275 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:06,275 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:06,287 INFO L263 TraceCheckSpWp]: Trace formula consists of 4091 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-21 19:31:06,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:07,693 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11413 refuted. 0 times theorem prover too weak. 191022 trivial. 0 not checked. [2020-07-21 19:31:07,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:12,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:15,772 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:15,773 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:17,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:17,186 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:17,844 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,211 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,374 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:18,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:19,736 INFO L134 CoverageAnalysis]: Checked inductivity of 204138 backedges. 1703 proven. 11513 refuted. 0 times theorem prover too weak. 190922 trivial. 0 not checked. [2020-07-21 19:31:19,737 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112670671] [2020-07-21 19:31:19,737 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:19,737 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-21 19:31:19,737 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72054903] [2020-07-21 19:31:19,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-21 19:31:19,739 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:19,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-21 19:31:19,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-21 19:31:19,740 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-21 19:31:20,277 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:20,277 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-21 19:31:20,278 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 19:31:20,278 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1842 [2020-07-21 19:31:20,282 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:20,286 INFO L225 Difference]: With dead ends: 107 [2020-07-21 19:31:20,286 INFO L226 Difference]: Without dead ends: 103 [2020-07-21 19:31:20,287 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3692 GetRequests, 3644 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-21 19:31:20,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-21 19:31:20,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-21 19:31:20,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-21 19:31:20,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-21 19:31:20,301 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1842 [2020-07-21 19:31:20,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:20,303 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-21 19:31:20,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-21 19:31:20,303 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-21 19:31:20,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2107 [2020-07-21 19:31:20,344 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:20,345 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 162, 161, 161, 161, 161, 161, 161, 161, 161, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:20,545 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:20,546 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:20,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:20,547 INFO L82 PathProgramCache]: Analyzing trace with hash 211951896, now seen corresponding path program 9 times [2020-07-21 19:31:20,548 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:20,548 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1260983705] [2020-07-21 19:31:20,548 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:21,379 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:21,379 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:21,389 INFO L263 TraceCheckSpWp]: Trace formula consists of 4700 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:31:21,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:23,850 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14276 refuted. 0 times theorem prover too weak. 255984 trivial. 0 not checked. [2020-07-21 19:31:23,851 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:30,837 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:34,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:36,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:37,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:37,469 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,046 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,047 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,444 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,632 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,734 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:38,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:40,396 INFO L134 CoverageAnalysis]: Checked inductivity of 272412 backedges. 2152 proven. 14393 refuted. 0 times theorem prover too weak. 255867 trivial. 0 not checked. [2020-07-21 19:31:40,396 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1260983705] [2020-07-21 19:31:40,397 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:31:40,397 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 19:31:40,397 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466352972] [2020-07-21 19:31:40,399 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:31:40,399 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:31:40,399 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:31:40,400 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:31:40,400 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-21 19:31:41,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:31:41,100 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-21 19:31:41,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:31:41,101 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2106 [2020-07-21 19:31:41,105 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:31:41,109 INFO L225 Difference]: With dead ends: 112 [2020-07-21 19:31:41,109 INFO L226 Difference]: Without dead ends: 108 [2020-07-21 19:31:41,110 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4222 GetRequests, 4169 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:31:41,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-21 19:31:41,125 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-21 19:31:41,126 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 19:31:41,127 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 19:31:41,127 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2106 [2020-07-21 19:31:41,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:31:41,129 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 19:31:41,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:31:41,129 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 19:31:41,166 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2206 [2020-07-21 19:31:41,166 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:31:41,167 INFO L422 BasicCegarLoop]: trace histogram [323, 323, 260, 161, 161, 161, 161, 161, 161, 161, 99, 63, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:31:41,382 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:41,383 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:31:41,383 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:31:41,384 INFO L82 PathProgramCache]: Analyzing trace with hash -576304576, now seen corresponding path program 9 times [2020-07-21 19:31:41,385 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:31:41,385 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1354385661] [2020-07-21 19:31:41,385 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:31:42,315 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:31:42,315 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:31:42,328 INFO L263 TraceCheckSpWp]: Trace formula consists of 4898 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-21 19:31:42,353 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:31:44,114 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15429 refuted. 0 times theorem prover too weak. 275642 trivial. 0 not checked. [2020-07-21 19:31:44,114 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:31:51,461 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:55,472 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:57,467 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:57,468 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:58,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:59,054 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:59,460 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:59,681 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:59,793 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:59,794 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:59,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:31:59,860 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:01,677 INFO L134 CoverageAnalysis]: Checked inductivity of 293202 backedges. 2131 proven. 15555 refuted. 0 times theorem prover too weak. 275516 trivial. 0 not checked. [2020-07-21 19:32:01,678 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1354385661] [2020-07-21 19:32:01,678 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:32:01,678 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-21 19:32:01,679 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [72104781] [2020-07-21 19:32:01,680 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-21 19:32:01,680 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:32:01,681 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-21 19:32:01,681 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-21 19:32:01,681 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-21 19:32:02,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:32:02,563 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-21 19:32:02,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-21 19:32:02,564 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2205 [2020-07-21 19:32:02,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:32:02,571 INFO L225 Difference]: With dead ends: 117 [2020-07-21 19:32:02,571 INFO L226 Difference]: Without dead ends: 113 [2020-07-21 19:32:02,573 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4419 GetRequests, 4366 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 19:32:02,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-21 19:32:02,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-21 19:32:02,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-21 19:32:02,595 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-21 19:32:02,595 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2205 [2020-07-21 19:32:02,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:32:02,597 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-21 19:32:02,597 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-21 19:32:02,597 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-21 19:32:02,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4434 [2020-07-21 19:32:02,724 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:32:02,726 INFO L422 BasicCegarLoop]: trace histogram [681, 681, 341, 340, 340, 340, 340, 340, 340, 340, 340, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:32:02,926 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:02,927 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:32:02,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:32:02,929 INFO L82 PathProgramCache]: Analyzing trace with hash 1507680547, now seen corresponding path program 10 times [2020-07-21 19:32:02,930 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:32:02,930 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1957558878] [2020-07-21 19:32:02,930 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:04,633 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:32:04,633 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:32:04,670 INFO L263 TraceCheckSpWp]: Trace formula consists of 9891 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 19:32:04,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:32:11,880 INFO L134 CoverageAnalysis]: Checked inductivity of 1214310 backedges. 4455 proven. 34400 refuted. 0 times theorem prover too weak. 1175455 trivial. 0 not checked. [2020-07-21 19:32:11,880 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:32:29,388 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:29,389 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:37,781 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:41,500 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:43,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:45,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:46,420 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:46,421 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:46,958 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:47,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:47,341 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:47,411 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:32:54,976 INFO L134 CoverageAnalysis]: Checked inductivity of 1214310 backedges. 4455 proven. 34545 refuted. 0 times theorem prover too weak. 1175310 trivial. 0 not checked. [2020-07-21 19:32:54,977 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1957558878] [2020-07-21 19:32:54,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:32:54,978 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 19:32:54,978 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525955768] [2020-07-21 19:32:54,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 19:32:54,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:32:54,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 19:32:54,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:32:54,982 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-21 19:32:56,421 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:32:56,421 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-21 19:32:56,423 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:32:56,424 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4433 [2020-07-21 19:32:56,428 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:32:56,432 INFO L225 Difference]: With dead ends: 122 [2020-07-21 19:32:56,432 INFO L226 Difference]: Without dead ends: 118 [2020-07-21 19:32:56,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8877 GetRequests, 8819 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 19:32:56,434 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-21 19:32:56,453 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-21 19:32:56,454 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 19:32:56,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 19:32:56,456 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4433 [2020-07-21 19:32:56,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:32:56,459 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 19:32:56,459 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 19:32:56,459 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 19:32:56,820 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7417 [2020-07-21 19:32:56,821 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:32:56,823 INFO L422 BasicCegarLoop]: trace histogram [1091, 1091, 863, 545, 545, 545, 545, 545, 545, 545, 318, 228, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:32:57,023 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:57,024 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:32:57,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:32:57,028 INFO L82 PathProgramCache]: Analyzing trace with hash -1753951764, now seen corresponding path program 10 times [2020-07-21 19:32:57,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:32:57,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1641349089] [2020-07-21 19:32:57,029 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:32:59,916 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:32:59,917 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:33:00,009 INFO L263 TraceCheckSpWp]: Trace formula consists of 16472 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-21 19:33:00,104 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:33:22,459 INFO L134 CoverageAnalysis]: Checked inductivity of 3343293 backedges. 6845 proven. 59812 refuted. 0 times theorem prover too weak. 3276636 trivial. 0 not checked. [2020-07-21 19:33:22,459 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:33:58,201 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:11,478 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:11,479 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:17,551 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:17,552 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:21,228 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:21,229 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:24,765 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:24,766 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:26,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:26,308 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:27,501 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:27,966 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:27,967 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:28,180 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:28,181 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:28,304 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:34:50,921 INFO L134 CoverageAnalysis]: Checked inductivity of 3343293 backedges. 6845 proven. 59967 refuted. 0 times theorem prover too weak. 3276481 trivial. 0 not checked. [2020-07-21 19:34:50,922 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1641349089] [2020-07-21 19:34:50,922 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:34:50,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-21 19:34:50,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106716588] [2020-07-21 19:34:50,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-21 19:34:50,929 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:34:50,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-21 19:34:50,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-21 19:34:50,929 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-21 19:34:52,673 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:34:52,674 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-21 19:34:52,679 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-21 19:34:52,680 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 7416 [2020-07-21 19:34:52,685 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:34:52,688 INFO L225 Difference]: With dead ends: 127 [2020-07-21 19:34:52,688 INFO L226 Difference]: Without dead ends: 123 [2020-07-21 19:34:52,690 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14842 GetRequests, 14784 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-21 19:34:52,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-21 19:34:52,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-21 19:34:52,713 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-21 19:34:52,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-21 19:34:52,715 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 7416 [2020-07-21 19:34:52,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:34:52,720 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-21 19:34:52,720 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-21 19:34:52,720 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-21 19:34:53,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8113 [2020-07-21 19:34:53,126 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:34:53,129 INFO L422 BasicCegarLoop]: trace histogram [1247, 1247, 624, 623, 623, 623, 623, 623, 623, 623, 623, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:34:53,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:34:53,331 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:34:53,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:34:53,334 INFO L82 PathProgramCache]: Analyzing trace with hash 851758860, now seen corresponding path program 11 times [2020-07-21 19:34:53,334 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:34:53,334 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152356629] [2020-07-21 19:34:53,335 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:34:56,703 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:34:56,704 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:34:56,813 INFO L263 TraceCheckSpWp]: Trace formula consists of 18098 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 19:34:56,904 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:35:22,906 INFO L134 CoverageAnalysis]: Checked inductivity of 4076289 backedges. 7952 proven. 70465 refuted. 0 times theorem prover too weak. 3997872 trivial. 0 not checked. [2020-07-21 19:35:22,907 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:35:31,785 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 19:35:31,893 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 19:36:12,479 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:36:12,583 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:36:13,483 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:26,993 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:41,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:41,302 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:47,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:47,300 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:50,927 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:52,408 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:52,409 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:53,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:53,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:53,492 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:53,767 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:53,768 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:53,906 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:36:53,985 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:37:14,687 INFO L134 CoverageAnalysis]: Checked inductivity of 4076289 backedges. 7952 proven. 70641 refuted. 0 times theorem prover too weak. 3997696 trivial. 0 not checked. [2020-07-21 19:37:14,688 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152356629] [2020-07-21 19:37:14,688 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:37:14,690 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 19:37:14,690 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413059031] [2020-07-21 19:37:14,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 19:37:14,697 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:37:14,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 19:37:14,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:37:14,698 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-21 19:37:16,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:37:16,862 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-21 19:37:16,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 19:37:16,865 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 8112 [2020-07-21 19:37:16,875 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:37:16,883 INFO L225 Difference]: With dead ends: 132 [2020-07-21 19:37:16,883 INFO L226 Difference]: Without dead ends: 128 [2020-07-21 19:37:16,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16236 GetRequests, 16173 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 19:37:16,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-21 19:37:16,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-21 19:37:16,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 19:37:16,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 19:37:16,918 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 8112 [2020-07-21 19:37:16,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:37:16,927 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 19:37:16,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 19:37:16,927 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 19:37:17,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7564 [2020-07-21 19:37:17,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:37:17,583 INFO L422 BasicCegarLoop]: trace histogram [1115, 1115, 866, 557, 557, 557, 557, 557, 557, 557, 309, 249, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:37:17,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:17,798 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:37:17,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:37:17,803 INFO L82 PathProgramCache]: Analyzing trace with hash -1952013298, now seen corresponding path program 11 times [2020-07-21 19:37:17,803 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:37:17,803 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916902020] [2020-07-21 19:37:17,805 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:37:21,072 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:37:21,072 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:37:21,130 INFO L263 TraceCheckSpWp]: Trace formula consists of 16802 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-21 19:37:21,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:37:39,087 INFO L134 CoverageAnalysis]: Checked inductivity of 3478149 backedges. 7209 proven. 67068 refuted. 0 times theorem prover too weak. 3403872 trivial. 0 not checked. [2020-07-21 19:37:39,088 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:37:43,493 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:37:44,993 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 19:37:45,100 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:37:45,208 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:37:49,037 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 19:37:49,151 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 19:37:49,273 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 19:37:49,395 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 63 [2020-07-21 19:37:49,514 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 19:37:49,624 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 81 [2020-07-21 19:37:49,726 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 19:38:29,887 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 19:38:30,003 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 19:38:30,125 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:38:30,249 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:38:31,816 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 19:38:31,926 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 19:38:32,042 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:38:32,164 WARN L193 SmtUtils]: Spent 119.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:38:32,283 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-21 19:38:32,390 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 75 [2020-07-21 19:38:32,938 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:32,939 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:38:47,170 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 1 [2020-07-21 19:38:48,189 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 19:38:48,300 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 49 [2020-07-21 19:38:49,969 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 19:38:50,082 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 19:38:50,214 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:38:50,324 WARN L193 SmtUtils]: Spent 108.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:38:50,433 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 71 [2020-07-21 19:38:50,634 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:38:50,740 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 60 [2020-07-21 19:38:51,306 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:06,932 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:06,933 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:12,755 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:12,756 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:17,141 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:17,142 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:19,298 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:19,299 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:20,405 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:21,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:21,620 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:21,621 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:21,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:21,877 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:22,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-21 19:39:40,817 INFO L134 CoverageAnalysis]: Checked inductivity of 3478149 backedges. 7209 proven. 67255 refuted. 0 times theorem prover too weak. 3403685 trivial. 0 not checked. [2020-07-21 19:39:40,818 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916902020] [2020-07-21 19:39:40,818 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 19:39:40,820 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-21 19:39:40,820 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [111332050] [2020-07-21 19:39:40,823 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-21 19:39:40,824 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 19:39:40,824 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-21 19:39:40,825 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-21 19:39:40,825 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-21 19:39:43,409 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 19:39:43,409 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-21 19:39:43,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-21 19:39:43,412 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 7563 [2020-07-21 19:39:43,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 19:39:43,425 INFO L225 Difference]: With dead ends: 137 [2020-07-21 19:39:43,425 INFO L226 Difference]: Without dead ends: 133 [2020-07-21 19:39:43,427 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15137 GetRequests, 15074 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-21 19:39:43,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-21 19:39:43,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-21 19:39:43,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-21 19:39:43,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-21 19:39:43,461 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 7563 [2020-07-21 19:39:43,466 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 19:39:43,467 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-21 19:39:43,467 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-21 19:39:43,467 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-21 19:39:45,640 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15718 [2020-07-21 19:39:45,641 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 19:39:45,645 INFO L422 BasicCegarLoop]: trace histogram [2417, 2417, 1209, 1208, 1208, 1208, 1208, 1208, 1208, 1208, 1208, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 19:39:45,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:39:45,847 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 19:39:45,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 19:39:45,852 INFO L82 PathProgramCache]: Analyzing trace with hash -1825394659, now seen corresponding path program 12 times [2020-07-21 19:39:45,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 19:39:45,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1754000809] [2020-07-21 19:39:45,853 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 19:39:51,846 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 19:39:51,846 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 19:39:51,995 INFO L263 TraceCheckSpWp]: Trace formula consists of 35063 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-21 19:39:52,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 19:41:14,635 INFO L134 CoverageAnalysis]: Checked inductivity of 15324084 backedges. 16076 proven. 149794 refuted. 0 times theorem prover too weak. 15158214 trivial. 0 not checked. [2020-07-21 19:41:14,635 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 19:41:20,552 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 19:41:20,660 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:41:20,772 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-21 19:41:24,627 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 19:41:24,740 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 19:41:24,857 WARN L193 SmtUtils]: Spent 114.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:41:24,974 WARN L193 SmtUtils]: Spent 115.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-21 19:41:29,286 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-21 19:41:39,506 WARN L193 SmtUtils]: Spent 148.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 19:41:39,672 WARN L193 SmtUtils]: Spent 164.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-21 19:41:39,844 WARN L193 SmtUtils]: Spent 168.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 19:41:40,010 WARN L193 SmtUtils]: Spent 163.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-21 19:41:40,170 WARN L193 SmtUtils]: Spent 153.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-21 19:41:40,326 WARN L193 SmtUtils]: Spent 152.00 ms on a formula simplification that was a NOOP. DAG size: 88 [2020-07-21 19:41:40,470 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-21 19:41:40,608 WARN L193 SmtUtils]: Spent 135.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-21 19:41:40,739 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-21 19:41:40,868 WARN L193 SmtUtils]: Spent 126.00 ms on a formula simplification that was a NOOP. DAG size: 74 [2020-07-21 19:41:40,980 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-21 19:41:41,085 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 66