/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 4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/recursive-simple/fibo_20-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-20 21:22:36,757 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-20 21:22:36,759 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-20 21:22:36,771 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-20 21:22:36,772 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-20 21:22:36,773 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-20 21:22:36,774 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-20 21:22:36,776 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-20 21:22:36,778 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-20 21:22:36,778 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-20 21:22:36,780 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-20 21:22:36,781 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-20 21:22:36,782 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-20 21:22:36,789 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-20 21:22:36,790 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-20 21:22:36,792 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-20 21:22:36,793 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-20 21:22:36,794 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-20 21:22:36,799 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-20 21:22:36,803 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-20 21:22:36,807 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-20 21:22:36,808 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-20 21:22:36,811 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-20 21:22:36,812 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-20 21:22:36,815 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-07-20 21:22:36,816 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-07-20 21:22:36,816 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-07-20 21:22:36,817 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-07-20 21:22:36,817 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-07-20 21:22:36,818 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2020-07-20 21:22:36,820 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-07-20 21:22:36,821 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-07-20 21:22:36,822 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-07-20 21:22:36,823 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-07-20 21:22:36,825 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-07-20 21:22:36,825 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-07-20 21:22:36,826 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-07-20 21:22:36,826 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-07-20 21:22:36,827 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-20 21:22:36,827 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-20 21:22:36,829 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-20 21:22:36,830 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-20 21:22:36,868 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-20 21:22:36,868 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-20 21:22:36,869 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-20 21:22:36,870 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-20 21:22:36,870 INFO L138 SettingsManager]: * Use SBE=true [2020-07-20 21:22:36,873 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-20 21:22:36,874 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-20 21:22:36,874 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-20 21:22:36,874 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-20 21:22:36,874 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-20 21:22:36,874 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-20 21:22:36,875 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-20 21:22:36,875 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-20 21:22:36,875 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-20 21:22:36,875 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-20 21:22:36,877 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-20 21:22:36,878 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-20 21:22:36,878 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-20 21:22:36,878 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-20 21:22:36,878 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-20 21:22:36,878 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-20 21:22:36,879 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:22:36,879 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-20 21:22:36,879 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-20 21:22:36,879 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-20 21:22:36,879 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-20 21:22:36,880 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:36,880 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-20 21:22:36,880 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-20 21:22:36,883 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 -> 4 [2020-07-20 21:22:37,155 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-20 21:22:37,170 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-20 21:22:37,174 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-20 21:22:37,175 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-20 21:22:37,178 INFO L275 PluginConnector]: CDTParser initialized [2020-07-20 21:22:37,179 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/fibo_20-2.c [2020-07-20 21:22:37,260 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dd4fc4d89/f991e3e881ae4213b809b9d429bf08b6/FLAG6b94fe1e4 [2020-07-20 21:22:37,672 INFO L306 CDTParser]: Found 1 translation units. [2020-07-20 21:22:37,673 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/fibo_20-2.c [2020-07-20 21:22:37,680 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dd4fc4d89/f991e3e881ae4213b809b9d429bf08b6/FLAG6b94fe1e4 [2020-07-20 21:22:38,015 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/dd4fc4d89/f991e3e881ae4213b809b9d429bf08b6 [2020-07-20 21:22:38,024 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-20 21:22:38,027 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-20 21:22:38,028 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:38,029 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-20 21:22:38,032 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-20 21:22:38,033 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:38" (1/1) ... [2020-07-20 21:22:38,037 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2f2cae4e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:38, skipping insertion in model container [2020-07-20 21:22:38,037 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.07 09:22:38" (1/1) ... [2020-07-20 21:22:38,045 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-20 21:22:38,060 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-20 21:22:38,238 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:38,242 INFO L203 MainTranslator]: Completed pre-run [2020-07-20 21:22:38,262 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-20 21:22:38,278 INFO L208 MainTranslator]: Completed translation [2020-07-20 21:22:38,278 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:38 WrapperNode [2020-07-20 21:22:38,278 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-20 21:22:38,279 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-20 21:22:38,279 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-20 21:22:38,280 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-20 21:22:38,294 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:38" (1/1) ... [2020-07-20 21:22:38,295 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:38" (1/1) ... [2020-07-20 21:22:38,300 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:38" (1/1) ... [2020-07-20 21:22:38,301 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:38" (1/1) ... [2020-07-20 21:22:38,304 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:38" (1/1) ... [2020-07-20 21:22:38,307 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:38" (1/1) ... [2020-07-20 21:22:38,308 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:38" (1/1) ... [2020-07-20 21:22:38,309 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-20 21:22:38,310 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-20 21:22:38,310 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-20 21:22:38,310 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-20 21:22:38,311 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:38" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-20 21:22:38,449 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-20 21:22:38,449 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-20 21:22:38,449 INFO L138 BoogieDeclarations]: Found implementation of procedure fibo [2020-07-20 21:22:38,449 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-20 21:22:38,450 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-07-20 21:22:38,450 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-20 21:22:38,450 INFO L130 BoogieDeclarations]: Found specification of procedure fibo [2020-07-20 21:22:38,450 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-20 21:22:38,450 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-20 21:22:38,450 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-20 21:22:38,612 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-20 21:22:38,612 INFO L295 CfgBuilder]: Removed 0 assume(true) statements. [2020-07-20 21:22:38,616 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:38 BoogieIcfgContainer [2020-07-20 21:22:38,616 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-20 21:22:38,618 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-20 21:22:38,618 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-20 21:22:38,621 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-20 21:22:38,621 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.07 09:22:38" (1/3) ... [2020-07-20 21:22:38,622 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e189528 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:38, skipping insertion in model container [2020-07-20 21:22:38,622 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.07 09:22:38" (2/3) ... [2020-07-20 21:22:38,623 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1e189528 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.07 09:22:38, skipping insertion in model container [2020-07-20 21:22:38,623 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.07 09:22:38" (3/3) ... [2020-07-20 21:22:38,625 INFO L109 eAbstractionObserver]: Analyzing ICFG fibo_20-2.c [2020-07-20 21:22:38,632 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-20 21:22:38,638 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-20 21:22:38,652 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-20 21:22:38,675 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-20 21:22:38,675 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-20 21:22:38,676 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-20 21:22:38,676 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-20 21:22:38,676 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-20 21:22:38,676 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-20 21:22:38,676 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-20 21:22:38,677 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-20 21:22:38,696 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states. [2020-07-20 21:22:38,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-07-20 21:22:38,703 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:38,704 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:38,704 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:38,710 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:38,710 INFO L82 PathProgramCache]: Analyzing trace with hash 537028541, now seen corresponding path program 1 times [2020-07-20 21:22:38,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:38,718 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [717099355] [2020-07-20 21:22:38,719 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:38,790 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:38,790 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:38,793 INFO L263 TraceCheckSpWp]: Trace formula consists of 23 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:38,799 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:38,900 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:22:38,901 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:38,902 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [717099355] [2020-07-20 21:22:38,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:38,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:38,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611592132] [2020-07-20 21:22:38,910 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:38,911 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:38,926 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:38,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:38,930 INFO L87 Difference]: Start difference. First operand 24 states. Second operand 5 states. [2020-07-20 21:22:39,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:39,036 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2020-07-20 21:22:39,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:39,038 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-07-20 21:22:39,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:39,048 INFO L225 Difference]: With dead ends: 35 [2020-07-20 21:22:39,049 INFO L226 Difference]: Without dead ends: 21 [2020-07-20 21:22:39,052 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 [2020-07-20 21:22:39,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-20 21:22:39,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-20 21:22:39,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:22:39,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 21:22:39,112 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 13 [2020-07-20 21:22:39,113 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:39,113 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 21:22:39,114 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:39,114 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 21:22:39,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-20 21:22:39,116 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:39,116 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:39,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:39,330 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:39,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:39,331 INFO L82 PathProgramCache]: Analyzing trace with hash 179123823, now seen corresponding path program 1 times [2020-07-20 21:22:39,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:39,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1074463357] [2020-07-20 21:22:39,333 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:39,359 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:39,360 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:39,364 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 4 conjunts are in the unsatisfiable core [2020-07-20 21:22:39,366 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:39,408 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-20 21:22:39,409 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-20 21:22:39,409 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1074463357] [2020-07-20 21:22:39,410 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-20 21:22:39,410 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-07-20 21:22:39,410 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2023325290] [2020-07-20 21:22:39,412 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-07-20 21:22:39,412 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:39,413 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-07-20 21:22:39,413 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-07-20 21:22:39,413 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 5 states. [2020-07-20 21:22:39,478 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:39,479 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-07-20 21:22:39,479 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-07-20 21:22:39,480 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-07-20 21:22:39,480 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:39,481 INFO L225 Difference]: With dead ends: 27 [2020-07-20 21:22:39,482 INFO L226 Difference]: Without dead ends: 23 [2020-07-20 21:22:39,483 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 [2020-07-20 21:22:39,484 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-07-20 21:22:39,490 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 21. [2020-07-20 21:22:39,490 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-20 21:22:39,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2020-07-20 21:22:39,492 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 14 [2020-07-20 21:22:39,492 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:39,492 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2020-07-20 21:22:39,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-07-20 21:22:39,493 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2020-07-20 21:22:39,494 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-07-20 21:22:39,494 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:39,495 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] [2020-07-20 21:22:39,702 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:39,704 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:39,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:39,706 INFO L82 PathProgramCache]: Analyzing trace with hash 806022394, now seen corresponding path program 1 times [2020-07-20 21:22:39,706 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:39,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257137402] [2020-07-20 21:22:39,707 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:39,747 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 2 check-sat command(s) [2020-07-20 21:22:39,747 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:39,749 INFO L263 TraceCheckSpWp]: Trace formula consists of 39 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:39,752 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:39,798 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2020-07-20 21:22:39,798 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:39,965 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:40,012 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:22:40,013 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257137402] [2020-07-20 21:22:40,013 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:40,014 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:22:40,014 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1366764851] [2020-07-20 21:22:40,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:22:40,015 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:40,015 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:22:40,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:22:40,016 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand 9 states. [2020-07-20 21:22:40,118 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:40,118 INFO L93 Difference]: Finished difference Result 32 states and 42 transitions. [2020-07-20 21:22:40,119 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:22:40,119 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-07-20 21:22:40,120 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:40,121 INFO L225 Difference]: With dead ends: 32 [2020-07-20 21:22:40,121 INFO L226 Difference]: Without dead ends: 28 [2020-07-20 21:22:40,122 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 [2020-07-20 21:22:40,122 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-07-20 21:22:40,129 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 26. [2020-07-20 21:22:40,129 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:22:40,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 21:22:40,131 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 26 [2020-07-20 21:22:40,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:40,132 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 21:22:40,132 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:22:40,132 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 21:22:40,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-07-20 21:22:40,134 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:40,134 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] [2020-07-20 21:22:40,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:40,347 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:40,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:40,348 INFO L82 PathProgramCache]: Analyzing trace with hash -983862936, now seen corresponding path program 1 times [2020-07-20 21:22:40,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:40,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2028229203] [2020-07-20 21:22:40,350 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:40,383 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:40,384 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:40,385 INFO L263 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 6 conjunts are in the unsatisfiable core [2020-07-20 21:22:40,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:40,432 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-07-20 21:22:40,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:40,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:40,611 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2020-07-20 21:22:40,611 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2028229203] [2020-07-20 21:22:40,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:40,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 7] total 9 [2020-07-20 21:22:40,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998564889] [2020-07-20 21:22:40,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-07-20 21:22:40,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:40,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-07-20 21:22:40,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-07-20 21:22:40,614 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 9 states. [2020-07-20 21:22:40,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:40,686 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2020-07-20 21:22:40,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-07-20 21:22:40,686 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 27 [2020-07-20 21:22:40,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:40,688 INFO L225 Difference]: With dead ends: 37 [2020-07-20 21:22:40,689 INFO L226 Difference]: Without dead ends: 33 [2020-07-20 21:22:40,689 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 [2020-07-20 21:22:40,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-20 21:22:40,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 26. [2020-07-20 21:22:40,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-07-20 21:22:40,698 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2020-07-20 21:22:40,698 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 27 [2020-07-20 21:22:40,698 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:40,699 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2020-07-20 21:22:40,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-07-20 21:22:40,699 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2020-07-20 21:22:40,700 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-07-20 21:22:40,701 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:40,701 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] [2020-07-20 21:22:40,915 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:40,916 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:40,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:40,917 INFO L82 PathProgramCache]: Analyzing trace with hash -2027372739, now seen corresponding path program 2 times [2020-07-20 21:22:40,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:40,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [948880514] [2020-07-20 21:22:40,919 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:40,955 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:40,955 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:40,956 INFO L263 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:40,959 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:41,016 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 21 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2020-07-20 21:22:41,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:41,280 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:41,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:41,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:41,340 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:41,392 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 6 proven. 26 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:22:41,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [948880514] [2020-07-20 21:22:41,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:41,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:22:41,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764165198] [2020-07-20 21:22:41,394 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:22:41,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:41,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:22:41,395 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:41,396 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand 11 states. [2020-07-20 21:22:41,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:41,561 INFO L93 Difference]: Finished difference Result 42 states and 68 transitions. [2020-07-20 21:22:41,561 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:41,562 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 39 [2020-07-20 21:22:41,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:41,564 INFO L225 Difference]: With dead ends: 42 [2020-07-20 21:22:41,564 INFO L226 Difference]: Without dead ends: 38 [2020-07-20 21:22:41,565 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 [2020-07-20 21:22:41,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-07-20 21:22:41,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2020-07-20 21:22:41,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:22:41,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 21:22:41,574 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 39 [2020-07-20 21:22:41,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:41,575 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 21:22:41,575 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:22:41,575 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 21:22:41,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-07-20 21:22:41,577 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:41,577 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] [2020-07-20 21:22:41,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:41,787 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:41,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:41,788 INFO L82 PathProgramCache]: Analyzing trace with hash -1111873851, now seen corresponding path program 2 times [2020-07-20 21:22:41,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:41,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1813246445] [2020-07-20 21:22:41,790 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:41,831 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:41,832 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:41,833 INFO L263 TraceCheckSpWp]: Trace formula consists of 82 conjuncts, 8 conjunts are in the unsatisfiable core [2020-07-20 21:22:41,835 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:41,873 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 24 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2020-07-20 21:22:41,874 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:42,090 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:42,139 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:42,140 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:42,185 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 31 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2020-07-20 21:22:42,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1813246445] [2020-07-20 21:22:42,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:42,186 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9] total 11 [2020-07-20 21:22:42,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [261892895] [2020-07-20 21:22:42,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-07-20 21:22:42,187 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:42,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-07-20 21:22:42,187 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=78, Unknown=0, NotChecked=0, Total=110 [2020-07-20 21:22:42,188 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 11 states. [2020-07-20 21:22:42,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:42,336 INFO L93 Difference]: Finished difference Result 47 states and 84 transitions. [2020-07-20 21:22:42,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-20 21:22:42,337 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 41 [2020-07-20 21:22:42,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:42,338 INFO L225 Difference]: With dead ends: 47 [2020-07-20 21:22:42,339 INFO L226 Difference]: Without dead ends: 43 [2020-07-20 21:22:42,339 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 [2020-07-20 21:22:42,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-07-20 21:22:42,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 31. [2020-07-20 21:22:42,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-07-20 21:22:42,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 45 transitions. [2020-07-20 21:22:42,355 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 45 transitions. Word has length 41 [2020-07-20 21:22:42,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:42,355 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 45 transitions. [2020-07-20 21:22:42,355 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-07-20 21:22:42,356 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 45 transitions. [2020-07-20 21:22:42,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-07-20 21:22:42,358 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:42,359 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] [2020-07-20 21:22:42,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:42,563 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:42,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:42,563 INFO L82 PathProgramCache]: Analyzing trace with hash -767819153, now seen corresponding path program 3 times [2020-07-20 21:22:42,564 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:42,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1578628593] [2020-07-20 21:22:42,565 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 8 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:42,610 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:42,610 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:42,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 128 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:42,618 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:42,674 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 79 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2020-07-20 21:22:42,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:43,055 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:43,150 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:43,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:43,190 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:43,191 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:43,233 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 17 proven. 91 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2020-07-20 21:22:43,234 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1578628593] [2020-07-20 21:22:43,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:43,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 21:22:43,235 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85129263] [2020-07-20 21:22:43,235 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:22:43,235 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:43,236 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:22:43,236 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:22:43,236 INFO L87 Difference]: Start difference. First operand 31 states and 45 transitions. Second operand 13 states. [2020-07-20 21:22:43,396 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:43,397 INFO L93 Difference]: Finished difference Result 52 states and 102 transitions. [2020-07-20 21:22:43,397 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:43,397 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 65 [2020-07-20 21:22:43,398 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:43,399 INFO L225 Difference]: With dead ends: 52 [2020-07-20 21:22:43,400 INFO L226 Difference]: Without dead ends: 48 [2020-07-20 21:22:43,400 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 [2020-07-20 21:22:43,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-07-20 21:22:43,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 36. [2020-07-20 21:22:43,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:22:43,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 21:22:43,412 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 65 [2020-07-20 21:22:43,412 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:43,413 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 21:22:43,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:22:43,413 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 21:22:43,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-07-20 21:22:43,415 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:43,415 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] [2020-07-20 21:22:43,623 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:43,624 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:43,625 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:43,625 INFO L82 PathProgramCache]: Analyzing trace with hash 1474757101, now seen corresponding path program 3 times [2020-07-20 21:22:43,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:43,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [729167078] [2020-07-20 21:22:43,627 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 9 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:43,678 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:43,678 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:43,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 180 conjuncts, 10 conjunts are in the unsatisfiable core [2020-07-20 21:22:43,683 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:43,749 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 166 refuted. 0 times theorem prover too weak. 234 trivial. 0 not checked. [2020-07-20 21:22:43,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:44,145 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,253 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,254 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,301 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:44,336 INFO L134 CoverageAnalysis]: Checked inductivity of 427 backedges. 27 proven. 181 refuted. 0 times theorem prover too weak. 219 trivial. 0 not checked. [2020-07-20 21:22:44,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [729167078] [2020-07-20 21:22:44,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:44,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 11] total 13 [2020-07-20 21:22:44,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [500206455] [2020-07-20 21:22:44,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-07-20 21:22:44,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:44,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-07-20 21:22:44,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=112, Unknown=0, NotChecked=0, Total=156 [2020-07-20 21:22:44,339 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 13 states. [2020-07-20 21:22:44,486 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:44,487 INFO L93 Difference]: Finished difference Result 57 states and 122 transitions. [2020-07-20 21:22:44,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-07-20 21:22:44,490 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 96 [2020-07-20 21:22:44,490 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:44,492 INFO L225 Difference]: With dead ends: 57 [2020-07-20 21:22:44,492 INFO L226 Difference]: Without dead ends: 53 [2020-07-20 21:22:44,493 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 195 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:44,494 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-07-20 21:22:44,504 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 36. [2020-07-20 21:22:44,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-07-20 21:22:44,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 58 transitions. [2020-07-20 21:22:44,506 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 58 transitions. Word has length 96 [2020-07-20 21:22:44,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:44,507 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 58 transitions. [2020-07-20 21:22:44,507 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-07-20 21:22:44,508 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 58 transitions. [2020-07-20 21:22:44,510 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2020-07-20 21:22:44,510 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:44,510 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] [2020-07-20 21:22:44,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:44,724 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:44,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:44,725 INFO L82 PathProgramCache]: Analyzing trace with hash 838335741, now seen corresponding path program 4 times [2020-07-20 21:22:44,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:44,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775780797] [2020-07-20 21:22:44,727 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 10 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:44,794 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:44,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:44,796 INFO L263 TraceCheckSpWp]: Trace formula consists of 226 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:44,801 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:44,884 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 244 refuted. 0 times theorem prover too weak. 386 trivial. 0 not checked. [2020-07-20 21:22:44,884 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:45,484 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:45,485 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:45,672 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:45,770 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:45,816 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:45,859 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 54 proven. 266 refuted. 0 times theorem prover too weak. 364 trivial. 0 not checked. [2020-07-20 21:22:45,860 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775780797] [2020-07-20 21:22:45,860 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:45,860 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 21:22:45,860 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1301335401] [2020-07-20 21:22:45,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:22:45,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:45,861 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:22:45,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:45,862 INFO L87 Difference]: Start difference. First operand 36 states and 58 transitions. Second operand 15 states. [2020-07-20 21:22:46,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:46,137 INFO L93 Difference]: Finished difference Result 62 states and 144 transitions. [2020-07-20 21:22:46,140 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:46,141 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 117 [2020-07-20 21:22:46,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:46,144 INFO L225 Difference]: With dead ends: 62 [2020-07-20 21:22:46,144 INFO L226 Difference]: Without dead ends: 58 [2020-07-20 21:22:46,145 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 [2020-07-20 21:22:46,145 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-07-20 21:22:46,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 41. [2020-07-20 21:22:46,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 21:22:46,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 21:22:46,169 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 117 [2020-07-20 21:22:46,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:46,170 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 21:22:46,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:22:46,170 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 21:22:46,174 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 191 [2020-07-20 21:22:46,176 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:46,176 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] [2020-07-20 21:22:46,377 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:46,378 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:46,378 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:46,379 INFO L82 PathProgramCache]: Analyzing trace with hash -2072922826, now seen corresponding path program 4 times [2020-07-20 21:22:46,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:46,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1214030712] [2020-07-20 21:22:46,380 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 11 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:46,460 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:46,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:46,461 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 12 conjunts are in the unsatisfiable core [2020-07-20 21:22:46,466 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:46,527 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 506 refuted. 0 times theorem prover too weak. 1334 trivial. 0 not checked. [2020-07-20 21:22:46,527 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:47,242 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,443 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,529 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,530 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,571 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,572 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:47,653 INFO L134 CoverageAnalysis]: Checked inductivity of 1926 backedges. 86 proven. 532 refuted. 0 times theorem prover too weak. 1308 trivial. 0 not checked. [2020-07-20 21:22:47,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1214030712] [2020-07-20 21:22:47,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:47,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 13] total 15 [2020-07-20 21:22:47,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333004568] [2020-07-20 21:22:47,657 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-07-20 21:22:47,657 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:47,657 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-07-20 21:22:47,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2020-07-20 21:22:47,658 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 15 states. [2020-07-20 21:22:47,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:47,811 INFO L93 Difference]: Finished difference Result 67 states and 168 transitions. [2020-07-20 21:22:47,811 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-07-20 21:22:47,811 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 190 [2020-07-20 21:22:47,812 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:47,814 INFO L225 Difference]: With dead ends: 67 [2020-07-20 21:22:47,815 INFO L226 Difference]: Without dead ends: 63 [2020-07-20 21:22:47,816 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 356 SyntacticMatches, 10 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=123, Invalid=257, Unknown=0, NotChecked=0, Total=380 [2020-07-20 21:22:47,816 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-07-20 21:22:47,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 41. [2020-07-20 21:22:47,825 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-07-20 21:22:47,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 73 transitions. [2020-07-20 21:22:47,826 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 73 transitions. Word has length 190 [2020-07-20 21:22:47,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:47,827 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 73 transitions. [2020-07-20 21:22:47,827 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-07-20 21:22:47,827 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 73 transitions. [2020-07-20 21:22:47,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 287 [2020-07-20 21:22:47,831 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:47,832 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] [2020-07-20 21:22:48,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,047 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:48,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:48,048 INFO L82 PathProgramCache]: Analyzing trace with hash -1082984306, now seen corresponding path program 5 times [2020-07-20 21:22:48,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:48,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1093942906] [2020-07-20 21:22:48,049 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 12 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:48,162 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:48,162 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:48,164 INFO L263 TraceCheckSpWp]: Trace formula consists of 543 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:22:48,169 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:48,285 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 967 refuted. 0 times theorem prover too weak. 3536 trivial. 0 not checked. [2020-07-20 21:22:48,286 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:49,403 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,718 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,874 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:49,952 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,003 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:50,104 INFO L134 CoverageAnalysis]: Checked inductivity of 4662 backedges. 159 proven. 1002 refuted. 0 times theorem prover too weak. 3501 trivial. 0 not checked. [2020-07-20 21:22:50,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1093942906] [2020-07-20 21:22:50,105 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:50,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 21:22:50,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [855051217] [2020-07-20 21:22:50,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:22:50,107 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:50,107 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:22:50,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:50,108 INFO L87 Difference]: Start difference. First operand 41 states and 73 transitions. Second operand 17 states. [2020-07-20 21:22:50,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:50,324 INFO L93 Difference]: Finished difference Result 72 states and 194 transitions. [2020-07-20 21:22:50,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:22:50,324 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 286 [2020-07-20 21:22:50,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:50,328 INFO L225 Difference]: With dead ends: 72 [2020-07-20 21:22:50,329 INFO L226 Difference]: Without dead ends: 68 [2020-07-20 21:22:50,330 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 [2020-07-20 21:22:50,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-07-20 21:22:50,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 46. [2020-07-20 21:22:50,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 21:22:50,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 21:22:50,355 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 286 [2020-07-20 21:22:50,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:50,357 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 21:22:50,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:22:50,357 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 21:22:50,366 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2020-07-20 21:22:50,366 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:50,367 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 34, 21, 21, 21, 21, 21, 21, 21, 13, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:50,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:50,581 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:50,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:50,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1006419304, now seen corresponding path program 5 times [2020-07-20 21:22:50,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:50,582 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [761271957] [2020-07-20 21:22:50,582 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 13 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:50,709 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:50,709 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:50,711 INFO L263 TraceCheckSpWp]: Trace formula consists of 561 conjuncts, 14 conjunts are in the unsatisfiable core [2020-07-20 21:22:50,716 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:50,850 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1055 refuted. 0 times theorem prover too weak. 3799 trivial. 0 not checked. [2020-07-20 21:22:50,850 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:52,035 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,352 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,514 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,615 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,616 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,660 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:52,728 INFO L134 CoverageAnalysis]: Checked inductivity of 5013 backedges. 159 proven. 1095 refuted. 0 times theorem prover too weak. 3759 trivial. 0 not checked. [2020-07-20 21:22:52,729 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [761271957] [2020-07-20 21:22:52,729 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:52,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 15] total 17 [2020-07-20 21:22:52,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745678606] [2020-07-20 21:22:52,730 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-07-20 21:22:52,731 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:52,731 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-07-20 21:22:52,731 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2020-07-20 21:22:52,731 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 17 states. [2020-07-20 21:22:52,932 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:52,932 INFO L93 Difference]: Finished difference Result 77 states and 222 transitions. [2020-07-20 21:22:52,933 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-07-20 21:22:52,933 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 299 [2020-07-20 21:22:52,934 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:52,937 INFO L225 Difference]: With dead ends: 77 [2020-07-20 21:22:52,937 INFO L226 Difference]: Without dead ends: 73 [2020-07-20 21:22:52,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 570 SyntacticMatches, 12 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 102 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=164, Invalid=342, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:22:52,939 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-07-20 21:22:52,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 46. [2020-07-20 21:22:52,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-07-20 21:22:52,949 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 90 transitions. [2020-07-20 21:22:52,949 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 90 transitions. Word has length 299 [2020-07-20 21:22:52,950 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:52,950 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 90 transitions. [2020-07-20 21:22:52,950 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-07-20 21:22:52,950 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 90 transitions. [2020-07-20 21:22:52,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 508 [2020-07-20 21:22:52,953 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:52,954 INFO L422 BasicCegarLoop]: trace histogram [77, 77, 39, 38, 38, 38, 38, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:22:53,168 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:53,169 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:53,169 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:53,170 INFO L82 PathProgramCache]: Analyzing trace with hash 785285043, now seen corresponding path program 6 times [2020-07-20 21:22:53,170 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:53,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1735276743] [2020-07-20 21:22:53,171 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 14 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:53,368 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:53,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:53,372 INFO L263 TraceCheckSpWp]: Trace formula consists of 958 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:22:53,380 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:53,595 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2126 refuted. 0 times theorem prover too weak. 12702 trivial. 0 not checked. [2020-07-20 21:22:53,596 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:55,513 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,041 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,414 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,613 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,614 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,700 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:22:56,930 INFO L134 CoverageAnalysis]: Checked inductivity of 15219 backedges. 391 proven. 2177 refuted. 0 times theorem prover too weak. 12651 trivial. 0 not checked. [2020-07-20 21:22:56,931 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1735276743] [2020-07-20 21:22:56,931 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:22:56,931 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 21:22:56,931 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019149551] [2020-07-20 21:22:56,932 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:22:56,932 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:22:56,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:22:56,933 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:22:56,933 INFO L87 Difference]: Start difference. First operand 46 states and 90 transitions. Second operand 19 states. [2020-07-20 21:22:57,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:22:57,378 INFO L93 Difference]: Finished difference Result 82 states and 252 transitions. [2020-07-20 21:22:57,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:22:57,379 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 507 [2020-07-20 21:22:57,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:22:57,383 INFO L225 Difference]: With dead ends: 82 [2020-07-20 21:22:57,383 INFO L226 Difference]: Without dead ends: 78 [2020-07-20 21:22:57,384 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1021 GetRequests, 983 SyntacticMatches, 14 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=211, Invalid=439, Unknown=0, NotChecked=0, Total=650 [2020-07-20 21:22:57,384 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-07-20 21:22:57,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 51. [2020-07-20 21:22:57,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 21:22:57,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 21:22:57,396 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 507 [2020-07-20 21:22:57,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:22:57,397 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 21:22:57,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:22:57,398 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 21:22:57,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 451 [2020-07-20 21:22:57,401 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:22:57,401 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] [2020-07-20 21:22:57,616 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:57,616 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:22:57,616 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:22:57,617 INFO L82 PathProgramCache]: Analyzing trace with hash -1350718391, now seen corresponding path program 6 times [2020-07-20 21:22:57,617 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:22:57,618 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [233952540] [2020-07-20 21:22:57,618 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 15 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:22:57,828 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:22:57,828 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:22:57,831 INFO L263 TraceCheckSpWp]: Trace formula consists of 844 conjuncts, 16 conjunts are in the unsatisfiable core [2020-07-20 21:22:57,838 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:22:58,024 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1918 refuted. 0 times theorem prover too weak. 9431 trivial. 0 not checked. [2020-07-20 21:22:58,025 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:22:59,670 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,264 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,265 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,584 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,585 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,737 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,828 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,880 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:00,999 INFO L134 CoverageAnalysis]: Checked inductivity of 11682 backedges. 333 proven. 1975 refuted. 0 times theorem prover too weak. 9374 trivial. 0 not checked. [2020-07-20 21:23:00,999 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [233952540] [2020-07-20 21:23:00,999 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:00,999 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 17] total 19 [2020-07-20 21:23:01,000 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [745678706] [2020-07-20 21:23:01,000 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-07-20 21:23:01,001 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:01,001 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-07-20 21:23:01,001 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=250, Unknown=0, NotChecked=0, Total=342 [2020-07-20 21:23:01,001 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 19 states. [2020-07-20 21:23:01,259 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:01,259 INFO L93 Difference]: Finished difference Result 87 states and 284 transitions. [2020-07-20 21:23:01,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-07-20 21:23:01,260 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 450 [2020-07-20 21:23:01,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:01,263 INFO L225 Difference]: With dead ends: 87 [2020-07-20 21:23:01,264 INFO L226 Difference]: Without dead ends: 83 [2020-07-20 21:23:01,266 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 [2020-07-20 21:23:01,266 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-07-20 21:23:01,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 51. [2020-07-20 21:23:01,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-07-20 21:23:01,287 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 109 transitions. [2020-07-20 21:23:01,287 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 109 transitions. Word has length 450 [2020-07-20 21:23:01,288 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:01,288 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 109 transitions. [2020-07-20 21:23:01,288 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-07-20 21:23:01,288 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 109 transitions. [2020-07-20 21:23:01,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1067 [2020-07-20 21:23:01,299 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:01,299 INFO L422 BasicCegarLoop]: trace histogram [163, 163, 82, 81, 81, 81, 81, 81, 81, 81, 81, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:01,514 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:01,515 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:01,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:01,516 INFO L82 PathProgramCache]: Analyzing trace with hash 40336450, now seen corresponding path program 7 times [2020-07-20 21:23:01,516 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:01,517 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1470387902] [2020-07-20 21:23:01,517 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 16 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:01,951 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:01,951 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:01,957 INFO L263 TraceCheckSpWp]: Trace formula consists of 2013 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:01,972 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:02,554 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5632 refuted. 0 times theorem prover too weak. 62583 trivial. 0 not checked. [2020-07-20 21:23:02,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:06,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:06,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:07,497 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,009 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,010 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,333 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,489 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,490 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,578 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,579 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:08,627 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:09,154 INFO L134 CoverageAnalysis]: Checked inductivity of 69012 backedges. 797 proven. 5702 refuted. 0 times theorem prover too weak. 62513 trivial. 0 not checked. [2020-07-20 21:23:09,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1470387902] [2020-07-20 21:23:09,155 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:09,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 21:23:09,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [606474053] [2020-07-20 21:23:09,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:23:09,157 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:09,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:23:09,158 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:23:09,158 INFO L87 Difference]: Start difference. First operand 51 states and 109 transitions. Second operand 21 states. [2020-07-20 21:23:09,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:09,796 INFO L93 Difference]: Finished difference Result 92 states and 318 transitions. [2020-07-20 21:23:09,796 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:23:09,796 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 1066 [2020-07-20 21:23:09,798 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:09,801 INFO L225 Difference]: With dead ends: 92 [2020-07-20 21:23:09,801 INFO L226 Difference]: Without dead ends: 88 [2020-07-20 21:23:09,807 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2140 GetRequests, 2097 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:23:09,808 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-07-20 21:23:09,832 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 56. [2020-07-20 21:23:09,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 21:23:09,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 21:23:09,834 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 1066 [2020-07-20 21:23:09,837 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:09,837 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 21:23:09,837 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:23:09,838 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 21:23:09,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 698 [2020-07-20 21:23:09,844 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:09,845 INFO L422 BasicCegarLoop]: trace histogram [101, 101, 84, 50, 50, 50, 50, 50, 50, 50, 34, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:10,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:10,059 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:10,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:10,060 INFO L82 PathProgramCache]: Analyzing trace with hash 822363973, now seen corresponding path program 7 times [2020-07-20 21:23:10,060 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:10,060 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1114327425] [2020-07-20 21:23:10,060 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 17 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:10,361 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:10,362 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:10,365 INFO L263 TraceCheckSpWp]: Trace formula consists of 1306 conjuncts, 18 conjunts are in the unsatisfiable core [2020-07-20 21:23:10,374 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:10,678 INFO L134 CoverageAnalysis]: Checked inductivity of 28586 backedges. 537 proven. 3626 refuted. 0 times theorem prover too weak. 24423 trivial. 0 not checked. [2020-07-20 21:23:10,678 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:13,364 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:13,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,243 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,691 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,692 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,950 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:14,951 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:15,129 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:15,222 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:15,271 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:15,691 INFO L134 CoverageAnalysis]: Checked inductivity of 28586 backedges. 537 proven. 3703 refuted. 0 times theorem prover too weak. 24346 trivial. 0 not checked. [2020-07-20 21:23:15,692 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1114327425] [2020-07-20 21:23:15,692 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:15,692 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 19] total 21 [2020-07-20 21:23:15,693 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311248271] [2020-07-20 21:23:15,694 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-07-20 21:23:15,694 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:15,694 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-07-20 21:23:15,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=308, Unknown=0, NotChecked=0, Total=420 [2020-07-20 21:23:15,695 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 21 states. [2020-07-20 21:23:16,286 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:16,286 INFO L93 Difference]: Finished difference Result 97 states and 354 transitions. [2020-07-20 21:23:16,287 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-07-20 21:23:16,287 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 697 [2020-07-20 21:23:16,289 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:16,295 INFO L225 Difference]: With dead ends: 97 [2020-07-20 21:23:16,295 INFO L226 Difference]: Without dead ends: 93 [2020-07-20 21:23:16,296 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 1401 GetRequests, 1358 SyntacticMatches, 16 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 184 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=264, Invalid=548, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:23:16,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-07-20 21:23:16,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 56. [2020-07-20 21:23:16,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-07-20 21:23:16,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 130 transitions. [2020-07-20 21:23:16,315 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 130 transitions. Word has length 697 [2020-07-20 21:23:16,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:16,316 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 130 transitions. [2020-07-20 21:23:16,316 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-07-20 21:23:16,316 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 130 transitions. [2020-07-20 21:23:16,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1951 [2020-07-20 21:23:16,358 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:16,359 INFO L422 BasicCegarLoop]: trace histogram [299, 299, 150, 149, 149, 149, 149, 149, 149, 149, 149, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:16,572 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:16,573 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:16,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:16,575 INFO L82 PathProgramCache]: Analyzing trace with hash 395569872, now seen corresponding path program 8 times [2020-07-20 21:23:16,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:16,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1034164827] [2020-07-20 21:23:16,576 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 18 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:17,233 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:17,233 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:17,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 3679 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:17,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:18,676 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1911 proven. 11715 refuted. 0 times theorem prover too weak. 219708 trivial. 0 not checked. [2020-07-20 21:23:18,677 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:24,213 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:27,203 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:28,899 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:29,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:29,486 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:29,865 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:29,866 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:30,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:30,166 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:30,167 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:30,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:30,219 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:31,483 INFO L134 CoverageAnalysis]: Checked inductivity of 233334 backedges. 1911 proven. 11807 refuted. 0 times theorem prover too weak. 219616 trivial. 0 not checked. [2020-07-20 21:23:31,483 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1034164827] [2020-07-20 21:23:31,483 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:31,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 21:23:31,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1697405764] [2020-07-20 21:23:31,487 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:31,487 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:31,487 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:31,488 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:31,488 INFO L87 Difference]: Start difference. First operand 56 states and 130 transitions. Second operand 23 states. [2020-07-20 21:23:31,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:31,904 INFO L93 Difference]: Finished difference Result 102 states and 392 transitions. [2020-07-20 21:23:31,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:31,905 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1950 [2020-07-20 21:23:31,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:31,911 INFO L225 Difference]: With dead ends: 102 [2020-07-20 21:23:31,911 INFO L226 Difference]: Without dead ends: 98 [2020-07-20 21:23:31,912 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 3909 GetRequests, 3861 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:31,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-07-20 21:23:31,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 61. [2020-07-20 21:23:31,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 21:23:31,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 21:23:31,926 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1950 [2020-07-20 21:23:31,929 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:31,929 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 21:23:31,929 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:31,929 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 21:23:31,945 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1354 [2020-07-20 21:23:31,945 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:31,946 INFO L422 BasicCegarLoop]: trace histogram [197, 197, 164, 98, 98, 98, 98, 98, 98, 98, 66, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:32,159 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 18 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:32,160 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:32,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:32,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1956381947, now seen corresponding path program 8 times [2020-07-20 21:23:32,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:32,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1331931475] [2020-07-20 21:23:32,161 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 19 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:32,676 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:32,676 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:32,682 INFO L263 TraceCheckSpWp]: Trace formula consists of 2530 conjuncts, 20 conjunts are in the unsatisfiable core [2020-07-20 21:23:32,699 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:33,455 INFO L134 CoverageAnalysis]: Checked inductivity of 109602 backedges. 1201 proven. 8306 refuted. 0 times theorem prover too weak. 100095 trivial. 0 not checked. [2020-07-20 21:23:33,456 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:37,667 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:39,749 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:39,750 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:40,904 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:40,905 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:41,377 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:41,687 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:41,688 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:41,861 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:41,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,021 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:23:42,724 INFO L134 CoverageAnalysis]: Checked inductivity of 109602 backedges. 1201 proven. 8406 refuted. 0 times theorem prover too weak. 99995 trivial. 0 not checked. [2020-07-20 21:23:42,725 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1331931475] [2020-07-20 21:23:42,725 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:23:42,725 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 21] total 23 [2020-07-20 21:23:42,725 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [972795327] [2020-07-20 21:23:42,727 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-07-20 21:23:42,727 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:23:42,727 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-07-20 21:23:42,728 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=134, Invalid=372, Unknown=0, NotChecked=0, Total=506 [2020-07-20 21:23:42,728 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 23 states. [2020-07-20 21:23:43,295 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:23:43,295 INFO L93 Difference]: Finished difference Result 107 states and 432 transitions. [2020-07-20 21:23:43,296 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-20 21:23:43,296 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 1353 [2020-07-20 21:23:43,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:23:43,301 INFO L225 Difference]: With dead ends: 107 [2020-07-20 21:23:43,301 INFO L226 Difference]: Without dead ends: 103 [2020-07-20 21:23:43,302 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 2714 GetRequests, 2666 SyntacticMatches, 18 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 234 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=323, Invalid=669, Unknown=0, NotChecked=0, Total=992 [2020-07-20 21:23:43,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2020-07-20 21:23:43,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 61. [2020-07-20 21:23:43,316 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-07-20 21:23:43,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 153 transitions. [2020-07-20 21:23:43,320 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 153 transitions. Word has length 1353 [2020-07-20 21:23:43,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:23:43,321 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 153 transitions. [2020-07-20 21:23:43,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-07-20 21:23:43,321 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 153 transitions. [2020-07-20 21:23:43,384 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2731 [2020-07-20 21:23:43,384 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:23:43,385 INFO L422 BasicCegarLoop]: trace histogram [419, 419, 210, 209, 209, 209, 209, 209, 209, 209, 209, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:23:43,599 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:43,600 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:23:43,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:23:43,602 INFO L82 PathProgramCache]: Analyzing trace with hash 221762484, now seen corresponding path program 9 times [2020-07-20 21:23:43,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:23:43,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [681989329] [2020-07-20 21:23:43,603 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 20 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:23:44,568 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:23:44,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:23:44,581 INFO L263 TraceCheckSpWp]: Trace formula consists of 5149 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:23:44,606 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:23:47,331 INFO L134 CoverageAnalysis]: Checked inductivity of 458964 backedges. 2784 proven. 18684 refuted. 0 times theorem prover too weak. 437496 trivial. 0 not checked. [2020-07-20 21:23:47,331 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:23:55,671 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:00,730 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:02,964 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:03,900 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:03,901 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:04,635 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:04,636 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:05,022 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:05,023 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:05,214 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:05,315 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:05,370 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:07,755 INFO L134 CoverageAnalysis]: Checked inductivity of 458964 backedges. 2784 proven. 18801 refuted. 0 times theorem prover too weak. 437379 trivial. 0 not checked. [2020-07-20 21:24:07,755 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [681989329] [2020-07-20 21:24:07,756 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:07,756 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 21:24:07,756 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92156285] [2020-07-20 21:24:07,758 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:24:07,758 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:07,759 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:24:07,759 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:24:07,759 INFO L87 Difference]: Start difference. First operand 61 states and 153 transitions. Second operand 25 states. [2020-07-20 21:24:08,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:08,670 INFO L93 Difference]: Finished difference Result 112 states and 474 transitions. [2020-07-20 21:24:08,670 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:24:08,671 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2730 [2020-07-20 21:24:08,674 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:08,678 INFO L225 Difference]: With dead ends: 112 [2020-07-20 21:24:08,678 INFO L226 Difference]: Without dead ends: 108 [2020-07-20 21:24:08,680 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5470 GetRequests, 5417 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:24:08,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-07-20 21:24:08,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 66. [2020-07-20 21:24:08,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 21:24:08,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 21:24:08,697 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2730 [2020-07-20 21:24:08,699 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:08,699 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 21:24:08,699 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:24:08,699 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 21:24:08,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 2536 [2020-07-20 21:24:08,752 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:08,753 INFO L422 BasicCegarLoop]: trace histogram [371, 371, 302, 185, 185, 185, 185, 185, 185, 185, 117, 69, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:08,960 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:08,961 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:08,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:08,963 INFO L82 PathProgramCache]: Analyzing trace with hash -1256486072, now seen corresponding path program 9 times [2020-07-20 21:24:08,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:08,963 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1256591647] [2020-07-20 21:24:08,964 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 21 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:09,871 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:09,871 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:09,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 4735 conjuncts, 22 conjunts are in the unsatisfiable core [2020-07-20 21:24:09,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:12,728 INFO L134 CoverageAnalysis]: Checked inductivity of 388071 backedges. 2496 proven. 17788 refuted. 0 times theorem prover too weak. 367787 trivial. 0 not checked. [2020-07-20 21:24:12,728 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:24:20,841 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:25,371 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:27,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:27,536 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:28,526 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:29,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:29,658 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:29,849 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:29,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:29,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:30,014 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:30,015 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:24:32,051 INFO L134 CoverageAnalysis]: Checked inductivity of 388071 backedges. 2496 proven. 17914 refuted. 0 times theorem prover too weak. 367661 trivial. 0 not checked. [2020-07-20 21:24:32,051 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1256591647] [2020-07-20 21:24:32,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:24:32,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 23] total 25 [2020-07-20 21:24:32,052 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1910029041] [2020-07-20 21:24:32,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-07-20 21:24:32,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:24:32,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-07-20 21:24:32,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=442, Unknown=0, NotChecked=0, Total=600 [2020-07-20 21:24:32,054 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 25 states. [2020-07-20 21:24:33,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:24:33,046 INFO L93 Difference]: Finished difference Result 117 states and 518 transitions. [2020-07-20 21:24:33,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-07-20 21:24:33,047 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 2535 [2020-07-20 21:24:33,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:24:33,053 INFO L225 Difference]: With dead ends: 117 [2020-07-20 21:24:33,054 INFO L226 Difference]: Without dead ends: 113 [2020-07-20 21:24:33,055 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5079 GetRequests, 5026 SyntacticMatches, 20 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 290 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=388, Invalid=802, Unknown=0, NotChecked=0, Total=1190 [2020-07-20 21:24:33,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2020-07-20 21:24:33,071 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 66. [2020-07-20 21:24:33,072 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-07-20 21:24:33,073 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 178 transitions. [2020-07-20 21:24:33,074 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 178 transitions. Word has length 2535 [2020-07-20 21:24:33,075 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:24:33,075 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 178 transitions. [2020-07-20 21:24:33,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-07-20 21:24:33,076 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 178 transitions. [2020-07-20 21:24:33,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4720 [2020-07-20 21:24:33,221 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:24:33,222 INFO L422 BasicCegarLoop]: trace histogram [725, 725, 363, 362, 362, 362, 362, 362, 362, 362, 362, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:24:33,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:33,424 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:24:33,424 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:24:33,426 INFO L82 PathProgramCache]: Analyzing trace with hash 668131987, now seen corresponding path program 10 times [2020-07-20 21:24:33,427 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:24:33,427 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [70342916] [2020-07-20 21:24:33,427 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 22 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:24:35,004 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:24:35,005 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:24:35,032 INFO L263 TraceCheckSpWp]: Trace formula consists of 8896 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 21:24:35,075 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:24:42,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1376505 backedges. 4488 proven. 36919 refuted. 0 times theorem prover too weak. 1335098 trivial. 0 not checked. [2020-07-20 21:24:42,361 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:25:00,746 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:00,748 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:08,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:12,376 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:14,282 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:15,365 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:16,208 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:16,210 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:16,664 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:16,878 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:17,002 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:17,074 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:25:23,960 INFO L134 CoverageAnalysis]: Checked inductivity of 1376505 backedges. 4488 proven. 37064 refuted. 0 times theorem prover too weak. 1334953 trivial. 0 not checked. [2020-07-20 21:25:23,961 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [70342916] [2020-07-20 21:25:23,961 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:25:23,962 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 21:25:23,962 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103210416] [2020-07-20 21:25:23,965 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 21:25:23,965 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:25:23,965 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 21:25:23,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:25:23,965 INFO L87 Difference]: Start difference. First operand 66 states and 178 transitions. Second operand 27 states. [2020-07-20 21:25:25,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:25:25,624 INFO L93 Difference]: Finished difference Result 122 states and 564 transitions. [2020-07-20 21:25:25,625 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:25:25,625 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 4719 [2020-07-20 21:25:25,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:25:25,633 INFO L225 Difference]: With dead ends: 122 [2020-07-20 21:25:25,634 INFO L226 Difference]: Without dead ends: 118 [2020-07-20 21:25:25,635 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9449 GetRequests, 9391 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 21:25:25,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-07-20 21:25:25,654 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 71. [2020-07-20 21:25:25,655 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 21:25:25,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 21:25:25,657 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 4719 [2020-07-20 21:25:25,660 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:25:25,660 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 21:25:25,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 21:25:25,660 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 21:25:26,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8273 [2020-07-20 21:25:26,050 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:25:26,053 INFO L422 BasicCegarLoop]: trace histogram [1215, 1215, 975, 607, 607, 607, 607, 607, 607, 607, 368, 240, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:25:26,253 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:26,254 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:25:26,254 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:25:26,257 INFO L82 PathProgramCache]: Analyzing trace with hash -368231220, now seen corresponding path program 10 times [2020-07-20 21:25:26,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:25:26,257 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1808086713] [2020-07-20 21:25:26,257 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 23 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:25:28,736 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:25:28,737 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:25:28,772 INFO L263 TraceCheckSpWp]: Trace formula consists of 15449 conjuncts, 24 conjunts are in the unsatisfiable core [2020-07-20 21:25:28,827 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:25:48,515 INFO L134 CoverageAnalysis]: Checked inductivity of 4160529 backedges. 7372 proven. 67089 refuted. 0 times theorem prover too weak. 4086068 trivial. 0 not checked. [2020-07-20 21:25:48,515 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:26:24,193 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:38,708 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:38,709 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:44,534 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:44,535 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:47,412 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:47,413 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:49,955 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:49,956 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:51,134 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:51,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:51,845 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:52,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:52,135 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:52,262 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:52,263 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:26:52,336 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:27:12,321 INFO L134 CoverageAnalysis]: Checked inductivity of 4160529 backedges. 7372 proven. 67244 refuted. 0 times theorem prover too weak. 4085913 trivial. 0 not checked. [2020-07-20 21:27:12,322 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1808086713] [2020-07-20 21:27:12,322 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:27:12,323 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 25] total 27 [2020-07-20 21:27:12,323 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200718791] [2020-07-20 21:27:12,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-07-20 21:27:12,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:27:12,328 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-07-20 21:27:12,329 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=184, Invalid=518, Unknown=0, NotChecked=0, Total=702 [2020-07-20 21:27:12,329 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 27 states. [2020-07-20 21:27:13,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:27:13,410 INFO L93 Difference]: Finished difference Result 127 states and 612 transitions. [2020-07-20 21:27:13,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-07-20 21:27:13,414 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 8272 [2020-07-20 21:27:13,420 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:27:13,423 INFO L225 Difference]: With dead ends: 127 [2020-07-20 21:27:13,424 INFO L226 Difference]: Without dead ends: 123 [2020-07-20 21:27:13,425 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16554 GetRequests, 16496 SyntacticMatches, 22 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 352 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=459, Invalid=947, Unknown=0, NotChecked=0, Total=1406 [2020-07-20 21:27:13,425 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2020-07-20 21:27:13,444 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 71. [2020-07-20 21:27:13,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-07-20 21:27:13,445 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 205 transitions. [2020-07-20 21:27:13,446 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 205 transitions. Word has length 8272 [2020-07-20 21:27:13,451 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:27:13,451 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 205 transitions. [2020-07-20 21:27:13,451 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-07-20 21:27:13,451 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 205 transitions. [2020-07-20 21:27:13,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7879 [2020-07-20 21:27:13,763 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:27:13,765 INFO L422 BasicCegarLoop]: trace histogram [1211, 1211, 606, 605, 605, 605, 605, 605, 605, 605, 605, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:27:13,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:13,966 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:27:13,967 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:27:13,970 INFO L82 PathProgramCache]: Analyzing trace with hash 1905470022, now seen corresponding path program 11 times [2020-07-20 21:27:13,970 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:27:13,970 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1050981807] [2020-07-20 21:27:13,970 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 24 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:27:16,501 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:27:16,501 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:27:16,543 INFO L263 TraceCheckSpWp]: Trace formula consists of 14851 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 21:27:16,596 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:27:35,353 INFO L134 CoverageAnalysis]: Checked inductivity of 3844170 backedges. 8359 proven. 67772 refuted. 0 times theorem prover too weak. 3768039 trivial. 0 not checked. [2020-07-20 21:27:35,353 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:28:10,924 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:26,434 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:36,475 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:36,476 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:41,971 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:41,972 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:46,353 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:48,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:48,891 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:50,130 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:50,131 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:50,744 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:51,028 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:51,029 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:51,212 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:28:51,319 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:29:09,760 INFO L134 CoverageAnalysis]: Checked inductivity of 3844170 backedges. 8359 proven. 67948 refuted. 0 times theorem prover too weak. 3767863 trivial. 0 not checked. [2020-07-20 21:29:09,760 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1050981807] [2020-07-20 21:29:09,761 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:29:09,762 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 21:29:09,762 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [455604902] [2020-07-20 21:29:09,768 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 21:29:09,768 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:29:09,769 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 21:29:09,769 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:29:09,769 INFO L87 Difference]: Start difference. First operand 71 states and 205 transitions. Second operand 29 states. [2020-07-20 21:29:11,774 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:29:11,775 INFO L93 Difference]: Finished difference Result 132 states and 662 transitions. [2020-07-20 21:29:11,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 21:29:11,777 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 7878 [2020-07-20 21:29:11,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:29:11,787 INFO L225 Difference]: With dead ends: 132 [2020-07-20 21:29:11,787 INFO L226 Difference]: Without dead ends: 128 [2020-07-20 21:29:11,789 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15768 GetRequests, 15705 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 21:29:11,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-07-20 21:29:11,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 76. [2020-07-20 21:29:11,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 21:29:11,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 21:29:11,813 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 7878 [2020-07-20 21:29:11,817 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:29:11,818 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 21:29:11,818 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 21:29:11,818 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 21:29:12,499 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7928 [2020-07-20 21:29:12,500 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:29:12,503 INFO L422 BasicCegarLoop]: trace histogram [1155, 1155, 990, 577, 577, 577, 577, 577, 577, 577, 413, 165, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:29:12,718 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:29:12,719 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:29:12,719 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:29:12,723 INFO L82 PathProgramCache]: Analyzing trace with hash -798223390, now seen corresponding path program 11 times [2020-07-20 21:29:12,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:29:12,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [771655107] [2020-07-20 21:29:12,725 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 25 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:29:15,734 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:29:15,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:29:15,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 14783 conjuncts, 26 conjunts are in the unsatisfiable core [2020-07-20 21:29:15,830 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:29:34,143 INFO L134 CoverageAnalysis]: Checked inductivity of 3819999 backedges. 8254 proven. 69831 refuted. 0 times theorem prover too weak. 3741914 trivial. 0 not checked. [2020-07-20 21:29:34,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:30:04,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:04,704 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:25,311 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:35,683 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:35,684 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:39,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:39,619 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:42,520 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:42,521 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:44,044 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:44,045 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:44,925 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:45,562 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:45,913 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:45,914 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:46,066 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:46,067 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:30:46,151 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:31:18,389 INFO L134 CoverageAnalysis]: Checked inductivity of 3819999 backedges. 8254 proven. 70018 refuted. 0 times theorem prover too weak. 3741727 trivial. 0 not checked. [2020-07-20 21:31:18,389 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [771655107] [2020-07-20 21:31:18,390 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:31:18,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 27] total 29 [2020-07-20 21:31:18,392 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1363542893] [2020-07-20 21:31:18,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-07-20 21:31:18,396 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:31:18,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-07-20 21:31:18,397 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=600, Unknown=0, NotChecked=0, Total=812 [2020-07-20 21:31:18,397 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 29 states. [2020-07-20 21:31:19,510 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-20 21:31:19,511 INFO L93 Difference]: Finished difference Result 137 states and 714 transitions. [2020-07-20 21:31:19,513 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-07-20 21:31:19,513 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 7927 [2020-07-20 21:31:19,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-20 21:31:19,523 INFO L225 Difference]: With dead ends: 137 [2020-07-20 21:31:19,523 INFO L226 Difference]: Without dead ends: 133 [2020-07-20 21:31:19,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15865 GetRequests, 15802 SyntacticMatches, 24 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 420 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=536, Invalid=1104, Unknown=0, NotChecked=0, Total=1640 [2020-07-20 21:31:19,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2020-07-20 21:31:19,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 76. [2020-07-20 21:31:19,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-07-20 21:31:19,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 234 transitions. [2020-07-20 21:31:19,553 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 234 transitions. Word has length 7927 [2020-07-20 21:31:19,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-20 21:31:19,557 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 234 transitions. [2020-07-20 21:31:19,557 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-07-20 21:31:19,557 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 234 transitions. [2020-07-20 21:31:21,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11194 [2020-07-20 21:31:21,236 INFO L414 BasicCegarLoop]: Found error trace [2020-07-20 21:31:21,241 INFO L422 BasicCegarLoop]: trace histogram [1721, 1721, 861, 860, 860, 860, 860, 860, 860, 860, 860, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-20 21:31:21,458 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:31:21,459 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-20 21:31:21,460 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-20 21:31:21,463 INFO L82 PathProgramCache]: Analyzing trace with hash -2122803597, now seen corresponding path program 12 times [2020-07-20 21:31:21,464 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-20 21:31:21,464 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [175673573] [2020-07-20 21:31:21,465 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 26 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-20 21:31:25,576 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 4 partitions) issued 3 check-sat command(s) [2020-07-20 21:31:25,577 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-20 21:31:25,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 21100 conjuncts, 28 conjunts are in the unsatisfiable core [2020-07-20 21:31:25,815 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-20 21:32:18,200 INFO L134 CoverageAnalysis]: Checked inductivity of 7767090 backedges. 12320 proven. 105526 refuted. 0 times theorem prover too weak. 7649244 trivial. 0 not checked. [2020-07-20 21:32:18,201 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-20 21:32:22,829 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:32:22,935 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 54 [2020-07-20 21:32:25,930 WARN L193 SmtUtils]: Spent 100.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:32:26,033 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:32:31,435 WARN L193 SmtUtils]: Spent 122.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:32:31,559 WARN L193 SmtUtils]: Spent 121.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:32:31,691 WARN L193 SmtUtils]: Spent 128.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:32:31,824 WARN L193 SmtUtils]: Spent 130.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:32:37,791 WARN L193 SmtUtils]: Spent 138.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 21:32:37,933 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 21:32:38,078 WARN L193 SmtUtils]: Spent 141.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 21:32:38,224 WARN L193 SmtUtils]: Spent 142.00 ms on a formula simplification that was a NOOP. DAG size: 68 [2020-07-20 21:32:38,371 WARN L193 SmtUtils]: Spent 140.00 ms on a formula simplification that was a NOOP. DAG size: 91 [2020-07-20 21:32:38,502 WARN L193 SmtUtils]: Spent 129.00 ms on a formula simplification that was a NOOP. DAG size: 87 [2020-07-20 21:32:38,632 WARN L193 SmtUtils]: Spent 127.00 ms on a formula simplification that was a NOOP. DAG size: 84 [2020-07-20 21:32:38,755 WARN L193 SmtUtils]: Spent 120.00 ms on a formula simplification that was a NOOP. DAG size: 80 [2020-07-20 21:32:38,869 WARN L193 SmtUtils]: Spent 112.00 ms on a formula simplification that was a NOOP. DAG size: 77 [2020-07-20 21:32:38,983 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 73 [2020-07-20 21:32:39,087 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 70 [2020-07-20 21:32:39,200 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification that was a NOOP. DAG size: 66 [2020-07-20 21:33:35,738 WARN L193 SmtUtils]: Spent 109.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:33:35,844 WARN L193 SmtUtils]: Spent 104.00 ms on a formula simplification that was a NOOP. DAG size: 61 [2020-07-20 21:33:35,958 WARN L193 SmtUtils]: Spent 111.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:33:36,073 WARN L193 SmtUtils]: Spent 113.00 ms on a formula simplification that was a NOOP. DAG size: 64 [2020-07-20 21:33:36,185 WARN L193 SmtUtils]: Spent 107.00 ms on a formula simplification that was a NOOP. DAG size: 85 [2020-07-20 21:33:36,292 WARN L193 SmtUtils]: Spent 105.00 ms on a formula simplification that was a NOOP. DAG size: 82 [2020-07-20 21:33:36,395 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 21:33:37,257 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:27,369 WARN L193 SmtUtils]: Spent 106.00 ms on a formula simplification that was a NOOP. DAG size: 56 [2020-07-20 21:34:27,571 WARN L193 SmtUtils]: Spent 101.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:34:27,676 WARN L193 SmtUtils]: Spent 103.00 ms on a formula simplification that was a NOOP. DAG size: 59 [2020-07-20 21:34:27,784 WARN L193 SmtUtils]: Spent 102.00 ms on a formula simplification that was a NOOP. DAG size: 78 [2020-07-20 21:34:28,650 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:28,651 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:54,384 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:34:54,385 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:03,561 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:11,209 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:14,223 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:17,194 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:18,259 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:18,260 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:18,829 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:19,155 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:19,342 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:19,458 INFO L501 QuantifierPusher]: Distributing 2 disjuncts over 2 conjuncts [2020-07-20 21:35:55,364 INFO L134 CoverageAnalysis]: Checked inductivity of 7767090 backedges. 12320 proven. 105736 refuted. 0 times theorem prover too weak. 7649034 trivial. 0 not checked. [2020-07-20 21:35:55,364 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [175673573] [2020-07-20 21:35:55,364 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-20 21:35:55,366 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 29] total 31 [2020-07-20 21:35:55,367 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765249252] [2020-07-20 21:35:55,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-07-20 21:35:55,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-20 21:35:55,370 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-07-20 21:35:55,370 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=242, Invalid=688, Unknown=0, NotChecked=0, Total=930 [2020-07-20 21:35:55,370 INFO L87 Difference]: Start difference. First operand 76 states and 234 transitions. Second operand 31 states.