/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loops/heavy-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 15:50:56,208 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 15:50:56,211 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 15:50:56,256 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 15:50:56,257 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 15:50:56,269 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 15:50:56,271 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 15:50:56,273 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 15:50:56,276 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 15:50:56,277 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 15:50:56,279 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 15:50:56,282 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 15:50:56,282 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 15:50:56,285 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 15:50:56,288 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 15:50:56,289 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 15:50:56,289 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 15:50:56,291 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 15:50:56,293 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 15:50:56,300 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 15:50:56,302 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 15:50:56,304 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 15:50:56,305 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 15:50:56,306 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 15:50:56,310 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 15:50:56,316 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2020-08-21 15:50:56,317 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2020-08-21 15:50:56,318 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2020-08-21 15:50:56,319 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2020-08-21 15:50:56,320 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2020-08-21 15:50:56,320 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2020-08-21 15:50:56,321 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2020-08-21 15:50:56,321 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2020-08-21 15:50:56,321 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 15:50:56,322 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 15:50:56,323 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 15:50:56,324 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 15:50:56,351 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 15:50:56,352 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 15:50:56,353 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 15:50:56,353 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 15:50:56,353 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 15:50:56,354 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 15:50:56,354 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 15:50:56,354 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 15:50:56,354 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 15:50:56,354 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 15:50:56,355 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 15:50:56,355 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 15:50:56,355 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 15:50:56,355 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 15:50:56,355 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 15:50:56,356 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 15:50:56,356 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 15:50:56,356 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 15:50:56,356 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 15:50:56,356 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 15:50:56,357 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 15:50:56,357 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 15:50:56,357 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 15:50:56,357 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 15:50:56,358 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 15:50:56,358 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 15:50:56,358 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 15:50:56,358 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 15:50:56,358 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 15:50:56,359 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 -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=SMALLEST;log-additional-information=true; [2020-08-21 15:50:56,648 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 15:50:56,660 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 15:50:56,664 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 15:50:56,665 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 15:50:56,666 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 15:50:56,666 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loops/heavy-2.c [2020-08-21 15:50:56,752 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/229570384/5d5804133b3d4a0984678e3c3718841f/FLAGf45e7b336 [2020-08-21 15:50:57,188 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 15:50:57,189 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loops/heavy-2.c [2020-08-21 15:50:57,194 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/229570384/5d5804133b3d4a0984678e3c3718841f/FLAGf45e7b336 [2020-08-21 15:50:57,572 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/229570384/5d5804133b3d4a0984678e3c3718841f [2020-08-21 15:50:57,581 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 15:50:57,582 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 15:50:57,583 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 15:50:57,584 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 15:50:57,586 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 15:50:57,587 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:50:57" (1/1) ... [2020-08-21 15:50:57,590 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@28b610eb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:57, skipping insertion in model container [2020-08-21 15:50:57,590 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 03:50:57" (1/1) ... [2020-08-21 15:50:57,597 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 15:50:57,612 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 15:50:57,811 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:50:57,854 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 15:50:57,872 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 15:50:58,006 INFO L208 MainTranslator]: Completed translation [2020-08-21 15:50:58,006 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:58 WrapperNode [2020-08-21 15:50:58,007 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 15:50:58,007 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 15:50:58,007 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 15:50:58,008 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 15:50:58,018 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:58" (1/1) ... [2020-08-21 15:50:58,018 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:58" (1/1) ... [2020-08-21 15:50:58,026 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:58" (1/1) ... [2020-08-21 15:50:58,026 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:58" (1/1) ... [2020-08-21 15:50:58,034 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:58" (1/1) ... [2020-08-21 15:50:58,039 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:58" (1/1) ... [2020-08-21 15:50:58,041 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:58" (1/1) ... [2020-08-21 15:50:58,043 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 15:50:58,043 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 15:50:58,043 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 15:50:58,043 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 15:50:58,044 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:58" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/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 [2020-08-21 15:50:58,101 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 15:50:58,101 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 15:50:58,101 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 15:50:58,102 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 15:50:58,102 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 15:50:58,102 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 15:50:58,102 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 15:50:58,102 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 15:50:58,102 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 15:50:58,102 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2020-08-21 15:50:58,103 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 15:50:58,103 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 15:50:58,364 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 15:50:58,364 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 15:50:58,368 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:50:58 BoogieIcfgContainer [2020-08-21 15:50:58,368 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 15:50:58,369 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 15:50:58,369 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 15:50:58,372 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 15:50:58,373 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 03:50:57" (1/3) ... [2020-08-21 15:50:58,374 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56e35b99 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:50:58, skipping insertion in model container [2020-08-21 15:50:58,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 03:50:58" (2/3) ... [2020-08-21 15:50:58,374 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@56e35b99 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 03:50:58, skipping insertion in model container [2020-08-21 15:50:58,374 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 03:50:58" (3/3) ... [2020-08-21 15:50:58,376 INFO L109 eAbstractionObserver]: Analyzing ICFG heavy-2.c [2020-08-21 15:50:58,387 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 15:50:58,394 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 15:50:58,408 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 15:50:58,431 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 15:50:58,432 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 15:50:58,432 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 15:50:58,432 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 15:50:58,432 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 15:50:58,432 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 15:50:58,432 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 15:50:58,433 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 15:50:58,450 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states. [2020-08-21 15:50:58,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-21 15:50:58,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:58,455 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:58,456 INFO L427 AbstractCegarLoop]: === Iteration 1 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:58,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:58,462 INFO L82 PathProgramCache]: Analyzing trace with hash 242978043, now seen corresponding path program 1 times [2020-08-21 15:50:58,469 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:58,469 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505306830] [2020-08-21 15:50:58,470 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:58,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:58,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:58,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:58,669 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:58,670 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505306830] [2020-08-21 15:50:58,672 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:50:58,672 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 15:50:58,673 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [817408075] [2020-08-21 15:50:58,683 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 15:50:58,684 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:58,705 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 15:50:58,706 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 15:50:58,708 INFO L87 Difference]: Start difference. First operand 19 states. Second operand 3 states. [2020-08-21 15:50:58,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:58,803 INFO L93 Difference]: Finished difference Result 42 states and 61 transitions. [2020-08-21 15:50:58,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 15:50:58,805 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 9 [2020-08-21 15:50:58,805 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:58,815 INFO L225 Difference]: With dead ends: 42 [2020-08-21 15:50:58,815 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 15:50:58,819 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 15:50:58,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 15:50:58,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 15. [2020-08-21 15:50:58,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 15:50:58,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 15:50:58,860 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 9 [2020-08-21 15:50:58,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:58,860 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 15:50:58,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 15:50:58,861 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 15:50:58,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2020-08-21 15:50:58,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:58,862 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:58,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 15:50:58,862 INFO L427 AbstractCegarLoop]: === Iteration 2 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:58,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:58,863 INFO L82 PathProgramCache]: Analyzing trace with hash 242949213, now seen corresponding path program 1 times [2020-08-21 15:50:58,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:58,864 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1721383055] [2020-08-21 15:50:58,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:58,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:58,939 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:58,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:58,952 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:58,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1721383055] [2020-08-21 15:50:58,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:50:58,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 15:50:58,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657594588] [2020-08-21 15:50:58,955 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:50:58,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:58,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:50:58,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:50:58,956 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 4 states. [2020-08-21 15:50:59,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:59,098 INFO L93 Difference]: Finished difference Result 36 states and 44 transitions. [2020-08-21 15:50:59,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:50:59,098 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 9 [2020-08-21 15:50:59,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:59,100 INFO L225 Difference]: With dead ends: 36 [2020-08-21 15:50:59,100 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 15:50:59,101 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:50:59,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 15:50:59,107 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 16. [2020-08-21 15:50:59,107 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-21 15:50:59,108 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-21 15:50:59,108 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2020-08-21 15:50:59,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:59,109 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-21 15:50:59,109 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:50:59,109 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-21 15:50:59,109 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 15:50:59,110 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:59,110 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:59,110 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 15:50:59,110 INFO L427 AbstractCegarLoop]: === Iteration 3 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:59,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:59,111 INFO L82 PathProgramCache]: Analyzing trace with hash 713101374, now seen corresponding path program 1 times [2020-08-21 15:50:59,111 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:59,111 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640225427] [2020-08-21 15:50:59,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:59,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:59,179 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:59,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:59,190 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:59,190 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640225427] [2020-08-21 15:50:59,190 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:50:59,191 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 15:50:59,191 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1059268239] [2020-08-21 15:50:59,191 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:50:59,191 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:59,192 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:50:59,192 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:50:59,192 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 4 states. [2020-08-21 15:50:59,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:59,290 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2020-08-21 15:50:59,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:50:59,291 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-21 15:50:59,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:59,292 INFO L225 Difference]: With dead ends: 40 [2020-08-21 15:50:59,292 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 15:50:59,293 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:50:59,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 15:50:59,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 17. [2020-08-21 15:50:59,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 15:50:59,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-21 15:50:59,300 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 12 [2020-08-21 15:50:59,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:59,301 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-21 15:50:59,301 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:50:59,301 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-21 15:50:59,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-21 15:50:59,302 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:59,302 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:59,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 15:50:59,303 INFO L427 AbstractCegarLoop]: === Iteration 4 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:59,303 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:59,303 INFO L82 PathProgramCache]: Analyzing trace with hash -1111837415, now seen corresponding path program 1 times [2020-08-21 15:50:59,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:59,304 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1618158812] [2020-08-21 15:50:59,304 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:59,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:59,374 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:59,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:59,390 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:59,393 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1618158812] [2020-08-21 15:50:59,393 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 15:50:59,393 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 15:50:59,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [266390990] [2020-08-21 15:50:59,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 15:50:59,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:59,396 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 15:50:59,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 15:50:59,396 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 4 states. [2020-08-21 15:50:59,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:59,488 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2020-08-21 15:50:59,488 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 15:50:59,488 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 15 [2020-08-21 15:50:59,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:59,489 INFO L225 Difference]: With dead ends: 31 [2020-08-21 15:50:59,490 INFO L226 Difference]: Without dead ends: 21 [2020-08-21 15:50:59,490 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:50:59,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-21 15:50:59,495 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 18. [2020-08-21 15:50:59,495 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-21 15:50:59,496 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-21 15:50:59,496 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 15 [2020-08-21 15:50:59,497 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:59,497 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-21 15:50:59,497 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 15:50:59,497 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-21 15:50:59,498 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-21 15:50:59,498 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:59,498 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:59,499 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 15:50:59,499 INFO L427 AbstractCegarLoop]: === Iteration 5 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:59,499 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:59,499 INFO L82 PathProgramCache]: Analyzing trace with hash 1672606071, now seen corresponding path program 1 times [2020-08-21 15:50:59,500 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:59,500 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [474064369] [2020-08-21 15:50:59,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:59,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:59,621 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:59,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:59,641 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:59,645 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [474064369] [2020-08-21 15:50:59,645 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:59,646 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 15:50:59,646 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1549425960] [2020-08-21 15:50:59,646 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 15:50:59,647 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:59,647 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 15:50:59,647 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 15:50:59,650 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 5 states. [2020-08-21 15:50:59,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:50:59,782 INFO L93 Difference]: Finished difference Result 34 states and 39 transitions. [2020-08-21 15:50:59,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 15:50:59,784 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 17 [2020-08-21 15:50:59,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:50:59,785 INFO L225 Difference]: With dead ends: 34 [2020-08-21 15:50:59,786 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 15:50:59,787 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:50:59,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 15:50:59,800 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2020-08-21 15:50:59,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 15:50:59,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-21 15:50:59,802 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 17 [2020-08-21 15:50:59,803 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:50:59,804 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-21 15:50:59,804 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 15:50:59,805 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-21 15:50:59,805 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 15:50:59,805 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:50:59,806 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:50:59,806 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 15:50:59,806 INFO L427 AbstractCegarLoop]: === Iteration 6 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:50:59,807 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:50:59,807 INFO L82 PathProgramCache]: Analyzing trace with hash 1758170709, now seen corresponding path program 2 times [2020-08-21 15:50:59,807 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:50:59,809 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1014525363] [2020-08-21 15:50:59,809 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:50:59,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:59,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:50:59,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:50:59,987 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:50:59,987 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1014525363] [2020-08-21 15:50:59,988 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:50:59,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 15:50:59,988 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [947858858] [2020-08-21 15:50:59,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 15:50:59,989 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:50:59,989 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 15:50:59,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 15:50:59,990 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 6 states. [2020-08-21 15:51:00,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:00,080 INFO L93 Difference]: Finished difference Result 38 states and 43 transitions. [2020-08-21 15:51:00,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 15:51:00,081 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 19 [2020-08-21 15:51:00,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:00,081 INFO L225 Difference]: With dead ends: 38 [2020-08-21 15:51:00,082 INFO L226 Difference]: Without dead ends: 25 [2020-08-21 15:51:00,082 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=26, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:51:00,083 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-21 15:51:00,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2020-08-21 15:51:00,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 22 states. [2020-08-21 15:51:00,088 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 24 transitions. [2020-08-21 15:51:00,088 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 24 transitions. Word has length 19 [2020-08-21 15:51:00,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:00,088 INFO L479 AbstractCegarLoop]: Abstraction has 22 states and 24 transitions. [2020-08-21 15:51:00,088 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 15:51:00,089 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 24 transitions. [2020-08-21 15:51:00,089 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2020-08-21 15:51:00,089 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:00,089 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:00,090 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 15:51:00,090 INFO L427 AbstractCegarLoop]: === Iteration 7 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:00,090 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:00,090 INFO L82 PathProgramCache]: Analyzing trace with hash -1913558093, now seen corresponding path program 3 times [2020-08-21 15:51:00,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:00,091 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346897100] [2020-08-21 15:51:00,091 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:00,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:00,204 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:00,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:00,209 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 2 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:00,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346897100] [2020-08-21 15:51:00,210 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:00,210 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 15:51:00,210 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [466821661] [2020-08-21 15:51:00,211 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 15:51:00,211 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:00,211 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 15:51:00,211 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 15:51:00,212 INFO L87 Difference]: Start difference. First operand 22 states and 24 transitions. Second operand 7 states. [2020-08-21 15:51:00,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:00,306 INFO L93 Difference]: Finished difference Result 42 states and 47 transitions. [2020-08-21 15:51:00,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 15:51:00,306 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 21 [2020-08-21 15:51:00,306 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:00,307 INFO L225 Difference]: With dead ends: 42 [2020-08-21 15:51:00,307 INFO L226 Difference]: Without dead ends: 27 [2020-08-21 15:51:00,308 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=37, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:51:00,308 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2020-08-21 15:51:00,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 24. [2020-08-21 15:51:00,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 24 states. [2020-08-21 15:51:00,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 26 transitions. [2020-08-21 15:51:00,313 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 26 transitions. Word has length 21 [2020-08-21 15:51:00,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:00,314 INFO L479 AbstractCegarLoop]: Abstraction has 24 states and 26 transitions. [2020-08-21 15:51:00,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 15:51:00,314 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 26 transitions. [2020-08-21 15:51:00,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2020-08-21 15:51:00,315 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:00,315 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:00,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 15:51:00,315 INFO L427 AbstractCegarLoop]: === Iteration 8 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:00,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:00,316 INFO L82 PathProgramCache]: Analyzing trace with hash 18180497, now seen corresponding path program 4 times [2020-08-21 15:51:00,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:00,316 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527483528] [2020-08-21 15:51:00,316 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:00,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:00,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:00,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:00,444 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 2 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:00,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527483528] [2020-08-21 15:51:00,445 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:00,445 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 15:51:00,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512713996] [2020-08-21 15:51:00,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 15:51:00,446 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:00,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 15:51:00,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2020-08-21 15:51:00,446 INFO L87 Difference]: Start difference. First operand 24 states and 26 transitions. Second operand 8 states. [2020-08-21 15:51:00,577 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:00,577 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2020-08-21 15:51:00,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 15:51:00,578 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 23 [2020-08-21 15:51:00,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:00,578 INFO L225 Difference]: With dead ends: 46 [2020-08-21 15:51:00,578 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 15:51:00,579 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=50, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:51:00,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 15:51:00,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2020-08-21 15:51:00,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 15:51:00,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2020-08-21 15:51:00,585 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 23 [2020-08-21 15:51:00,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:00,585 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2020-08-21 15:51:00,586 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 15:51:00,586 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2020-08-21 15:51:00,586 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 15:51:00,587 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:00,587 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:00,587 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 15:51:00,587 INFO L427 AbstractCegarLoop]: === Iteration 9 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:00,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:00,588 INFO L82 PathProgramCache]: Analyzing trace with hash 993093615, now seen corresponding path program 5 times [2020-08-21 15:51:00,588 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:00,588 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [530126121] [2020-08-21 15:51:00,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:00,608 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:00,717 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:00,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:00,723 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 2 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:00,724 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [530126121] [2020-08-21 15:51:00,724 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:00,724 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 15:51:00,724 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1848758645] [2020-08-21 15:51:00,725 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 15:51:00,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:00,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 15:51:00,725 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=52, Unknown=0, NotChecked=0, Total=72 [2020-08-21 15:51:00,726 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand 9 states. [2020-08-21 15:51:00,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:00,857 INFO L93 Difference]: Finished difference Result 50 states and 55 transitions. [2020-08-21 15:51:00,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 15:51:00,858 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-08-21 15:51:00,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:00,859 INFO L225 Difference]: With dead ends: 50 [2020-08-21 15:51:00,859 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 15:51:00,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:51:00,860 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 15:51:00,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 15:51:00,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 15:51:00,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2020-08-21 15:51:00,866 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 25 [2020-08-21 15:51:00,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:00,866 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2020-08-21 15:51:00,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 15:51:00,866 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2020-08-21 15:51:00,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2020-08-21 15:51:00,867 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:00,867 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:00,868 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 15:51:00,868 INFO L427 AbstractCegarLoop]: === Iteration 10 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:00,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:00,868 INFO L82 PathProgramCache]: Analyzing trace with hash 1581729485, now seen corresponding path program 6 times [2020-08-21 15:51:00,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:00,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1831101276] [2020-08-21 15:51:00,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:00,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:01,045 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:01,047 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:01,052 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 2 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:01,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1831101276] [2020-08-21 15:51:01,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:01,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 15:51:01,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1608149576] [2020-08-21 15:51:01,054 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 15:51:01,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:01,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 15:51:01,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=67, Unknown=0, NotChecked=0, Total=90 [2020-08-21 15:51:01,055 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand 10 states. [2020-08-21 15:51:01,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:01,256 INFO L93 Difference]: Finished difference Result 54 states and 59 transitions. [2020-08-21 15:51:01,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 15:51:01,256 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 27 [2020-08-21 15:51:01,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:01,257 INFO L225 Difference]: With dead ends: 54 [2020-08-21 15:51:01,257 INFO L226 Difference]: Without dead ends: 33 [2020-08-21 15:51:01,259 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:51:01,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-21 15:51:01,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 30. [2020-08-21 15:51:01,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 30 states. [2020-08-21 15:51:01,267 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2020-08-21 15:51:01,268 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 27 [2020-08-21 15:51:01,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:01,269 INFO L479 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2020-08-21 15:51:01,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 15:51:01,269 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2020-08-21 15:51:01,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2020-08-21 15:51:01,270 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:01,270 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:01,270 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 15:51:01,270 INFO L427 AbstractCegarLoop]: === Iteration 11 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:01,270 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:01,271 INFO L82 PathProgramCache]: Analyzing trace with hash 325117483, now seen corresponding path program 7 times [2020-08-21 15:51:01,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:01,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [949622754] [2020-08-21 15:51:01,271 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:01,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:01,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:01,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:01,479 INFO L134 CoverageAnalysis]: Checked inductivity of 51 backedges. 2 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:01,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [949622754] [2020-08-21 15:51:01,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:01,480 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 15:51:01,480 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207931110] [2020-08-21 15:51:01,481 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 15:51:01,481 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:01,482 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 15:51:01,482 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2020-08-21 15:51:01,482 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand 11 states. [2020-08-21 15:51:01,685 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:01,686 INFO L93 Difference]: Finished difference Result 58 states and 63 transitions. [2020-08-21 15:51:01,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 15:51:01,686 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 29 [2020-08-21 15:51:01,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:01,688 INFO L225 Difference]: With dead ends: 58 [2020-08-21 15:51:01,688 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 15:51:01,688 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:51:01,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 15:51:01,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 32. [2020-08-21 15:51:01,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 15:51:01,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 34 transitions. [2020-08-21 15:51:01,701 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 34 transitions. Word has length 29 [2020-08-21 15:51:01,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:01,702 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 34 transitions. [2020-08-21 15:51:01,702 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 15:51:01,702 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 34 transitions. [2020-08-21 15:51:01,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 15:51:01,703 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:01,703 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:01,703 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 15:51:01,703 INFO L427 AbstractCegarLoop]: === Iteration 12 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:01,704 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:01,704 INFO L82 PathProgramCache]: Analyzing trace with hash -393206263, now seen corresponding path program 8 times [2020-08-21 15:51:01,704 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:01,704 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [257721062] [2020-08-21 15:51:01,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:01,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:01,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:01,874 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:01,878 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 2 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:01,879 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [257721062] [2020-08-21 15:51:01,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:01,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 15:51:01,880 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2003788060] [2020-08-21 15:51:01,880 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 15:51:01,880 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:01,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 15:51:01,881 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-21 15:51:01,881 INFO L87 Difference]: Start difference. First operand 32 states and 34 transitions. Second operand 12 states. [2020-08-21 15:51:02,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:02,130 INFO L93 Difference]: Finished difference Result 62 states and 67 transitions. [2020-08-21 15:51:02,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 15:51:02,130 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 31 [2020-08-21 15:51:02,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:02,131 INFO L225 Difference]: With dead ends: 62 [2020-08-21 15:51:02,131 INFO L226 Difference]: Without dead ends: 37 [2020-08-21 15:51:02,132 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:51:02,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-21 15:51:02,136 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 34. [2020-08-21 15:51:02,137 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-21 15:51:02,137 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2020-08-21 15:51:02,138 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 31 [2020-08-21 15:51:02,138 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:02,138 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2020-08-21 15:51:02,138 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 15:51:02,138 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2020-08-21 15:51:02,139 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-21 15:51:02,139 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:02,139 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:02,139 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 15:51:02,140 INFO L427 AbstractCegarLoop]: === Iteration 13 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:02,140 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:02,140 INFO L82 PathProgramCache]: Analyzing trace with hash 787408487, now seen corresponding path program 9 times [2020-08-21 15:51:02,140 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:02,140 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1827233851] [2020-08-21 15:51:02,141 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:02,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:02,364 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:02,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:02,373 INFO L134 CoverageAnalysis]: Checked inductivity of 83 backedges. 2 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:02,373 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1827233851] [2020-08-21 15:51:02,373 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:02,374 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 15:51:02,374 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [732829433] [2020-08-21 15:51:02,376 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 15:51:02,376 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:02,376 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 15:51:02,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=124, Unknown=0, NotChecked=0, Total=156 [2020-08-21 15:51:02,378 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand 13 states. [2020-08-21 15:51:02,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:02,669 INFO L93 Difference]: Finished difference Result 66 states and 71 transitions. [2020-08-21 15:51:02,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 15:51:02,669 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 33 [2020-08-21 15:51:02,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:02,670 INFO L225 Difference]: With dead ends: 66 [2020-08-21 15:51:02,670 INFO L226 Difference]: Without dead ends: 39 [2020-08-21 15:51:02,671 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:51:02,672 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-21 15:51:02,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 36. [2020-08-21 15:51:02,680 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-21 15:51:02,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2020-08-21 15:51:02,681 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 33 [2020-08-21 15:51:02,681 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:02,681 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2020-08-21 15:51:02,681 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 15:51:02,684 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2020-08-21 15:51:02,684 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-21 15:51:02,684 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:02,685 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:02,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 15:51:02,685 INFO L427 AbstractCegarLoop]: === Iteration 14 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:02,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:02,685 INFO L82 PathProgramCache]: Analyzing trace with hash 1486817093, now seen corresponding path program 10 times [2020-08-21 15:51:02,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:02,687 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [476022982] [2020-08-21 15:51:02,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:02,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:02,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:02,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:02,923 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 2 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:02,923 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [476022982] [2020-08-21 15:51:02,923 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:02,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 15:51:02,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771709279] [2020-08-21 15:51:02,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 15:51:02,925 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:02,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 15:51:02,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=147, Unknown=0, NotChecked=0, Total=182 [2020-08-21 15:51:02,925 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand 14 states. [2020-08-21 15:51:03,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:03,225 INFO L93 Difference]: Finished difference Result 70 states and 75 transitions. [2020-08-21 15:51:03,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 15:51:03,225 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 35 [2020-08-21 15:51:03,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:03,227 INFO L225 Difference]: With dead ends: 70 [2020-08-21 15:51:03,227 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 15:51:03,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=170, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:51:03,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 15:51:03,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 38. [2020-08-21 15:51:03,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 15:51:03,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 40 transitions. [2020-08-21 15:51:03,233 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 40 transitions. Word has length 35 [2020-08-21 15:51:03,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:03,234 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 40 transitions. [2020-08-21 15:51:03,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 15:51:03,234 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 40 transitions. [2020-08-21 15:51:03,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 15:51:03,235 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:03,235 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:03,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 15:51:03,235 INFO L427 AbstractCegarLoop]: === Iteration 15 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:03,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:03,236 INFO L82 PathProgramCache]: Analyzing trace with hash -691378013, now seen corresponding path program 11 times [2020-08-21 15:51:03,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:03,236 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1820075020] [2020-08-21 15:51:03,236 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:03,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:03,463 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:03,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:03,469 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 2 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:03,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1820075020] [2020-08-21 15:51:03,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:03,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 15:51:03,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246883383] [2020-08-21 15:51:03,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 15:51:03,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:03,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 15:51:03,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=172, Unknown=0, NotChecked=0, Total=210 [2020-08-21 15:51:03,471 INFO L87 Difference]: Start difference. First operand 38 states and 40 transitions. Second operand 15 states. [2020-08-21 15:51:03,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:03,849 INFO L93 Difference]: Finished difference Result 74 states and 79 transitions. [2020-08-21 15:51:03,850 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 15:51:03,850 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-21 15:51:03,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:03,851 INFO L225 Difference]: With dead ends: 74 [2020-08-21 15:51:03,851 INFO L226 Difference]: Without dead ends: 43 [2020-08-21 15:51:03,852 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=43, Invalid=197, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:51:03,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-21 15:51:03,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 40. [2020-08-21 15:51:03,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-21 15:51:03,858 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 42 transitions. [2020-08-21 15:51:03,859 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 42 transitions. Word has length 37 [2020-08-21 15:51:03,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:03,859 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 42 transitions. [2020-08-21 15:51:03,859 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 15:51:03,859 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 42 transitions. [2020-08-21 15:51:03,860 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-21 15:51:03,860 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:03,860 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:03,860 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 15:51:03,861 INFO L427 AbstractCegarLoop]: === Iteration 16 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:03,861 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:03,861 INFO L82 PathProgramCache]: Analyzing trace with hash 2007165569, now seen corresponding path program 12 times [2020-08-21 15:51:03,861 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:03,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1750948181] [2020-08-21 15:51:03,862 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:03,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:04,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:04,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:04,159 INFO L134 CoverageAnalysis]: Checked inductivity of 146 backedges. 2 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:04,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1750948181] [2020-08-21 15:51:04,160 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:04,160 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 15:51:04,160 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [241093652] [2020-08-21 15:51:04,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 15:51:04,161 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:04,161 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 15:51:04,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=199, Unknown=0, NotChecked=0, Total=240 [2020-08-21 15:51:04,162 INFO L87 Difference]: Start difference. First operand 40 states and 42 transitions. Second operand 16 states. [2020-08-21 15:51:04,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:04,589 INFO L93 Difference]: Finished difference Result 78 states and 83 transitions. [2020-08-21 15:51:04,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 15:51:04,590 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 39 [2020-08-21 15:51:04,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:04,591 INFO L225 Difference]: With dead ends: 78 [2020-08-21 15:51:04,591 INFO L226 Difference]: Without dead ends: 45 [2020-08-21 15:51:04,593 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=226, Unknown=0, NotChecked=0, Total=272 [2020-08-21 15:51:04,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-21 15:51:04,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 42. [2020-08-21 15:51:04,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-21 15:51:04,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 44 transitions. [2020-08-21 15:51:04,599 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 44 transitions. Word has length 39 [2020-08-21 15:51:04,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:04,600 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 44 transitions. [2020-08-21 15:51:04,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 15:51:04,600 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 44 transitions. [2020-08-21 15:51:04,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 15:51:04,600 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:04,601 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:04,601 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 15:51:04,601 INFO L427 AbstractCegarLoop]: === Iteration 17 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:04,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:04,601 INFO L82 PathProgramCache]: Analyzing trace with hash 1147301087, now seen corresponding path program 13 times [2020-08-21 15:51:04,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:04,602 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1697628530] [2020-08-21 15:51:04,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:04,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:04,940 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:04,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:04,946 INFO L134 CoverageAnalysis]: Checked inductivity of 171 backedges. 2 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:04,946 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1697628530] [2020-08-21 15:51:04,946 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:04,946 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 15:51:04,947 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780002086] [2020-08-21 15:51:04,948 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 15:51:04,948 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:04,948 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 15:51:04,949 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=228, Unknown=0, NotChecked=0, Total=272 [2020-08-21 15:51:04,949 INFO L87 Difference]: Start difference. First operand 42 states and 44 transitions. Second operand 17 states. [2020-08-21 15:51:05,360 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:05,360 INFO L93 Difference]: Finished difference Result 82 states and 87 transitions. [2020-08-21 15:51:05,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 15:51:05,361 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 41 [2020-08-21 15:51:05,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:05,362 INFO L225 Difference]: With dead ends: 82 [2020-08-21 15:51:05,362 INFO L226 Difference]: Without dead ends: 47 [2020-08-21 15:51:05,363 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=257, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:51:05,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-21 15:51:05,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 44. [2020-08-21 15:51:05,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 15:51:05,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2020-08-21 15:51:05,369 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 41 [2020-08-21 15:51:05,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:05,369 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2020-08-21 15:51:05,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 15:51:05,370 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2020-08-21 15:51:05,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 15:51:05,370 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:05,370 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:05,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 15:51:05,371 INFO L427 AbstractCegarLoop]: === Iteration 18 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:05,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:05,371 INFO L82 PathProgramCache]: Analyzing trace with hash -548745283, now seen corresponding path program 14 times [2020-08-21 15:51:05,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:05,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1120969403] [2020-08-21 15:51:05,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:05,395 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,673 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:05,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:05,680 INFO L134 CoverageAnalysis]: Checked inductivity of 198 backedges. 2 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:05,680 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1120969403] [2020-08-21 15:51:05,681 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:05,681 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 15:51:05,681 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812940667] [2020-08-21 15:51:05,681 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 15:51:05,681 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:05,682 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 15:51:05,682 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=259, Unknown=0, NotChecked=0, Total=306 [2020-08-21 15:51:05,682 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand 18 states. [2020-08-21 15:51:06,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:06,163 INFO L93 Difference]: Finished difference Result 86 states and 91 transitions. [2020-08-21 15:51:06,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 15:51:06,163 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 43 [2020-08-21 15:51:06,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:06,164 INFO L225 Difference]: With dead ends: 86 [2020-08-21 15:51:06,164 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 15:51:06,164 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=290, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:51:06,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 15:51:06,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2020-08-21 15:51:06,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 15:51:06,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 48 transitions. [2020-08-21 15:51:06,170 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 48 transitions. Word has length 43 [2020-08-21 15:51:06,170 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:06,170 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 48 transitions. [2020-08-21 15:51:06,170 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 15:51:06,170 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 48 transitions. [2020-08-21 15:51:06,171 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-21 15:51:06,171 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:06,171 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:06,171 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 15:51:06,171 INFO L427 AbstractCegarLoop]: === Iteration 19 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:06,172 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:06,172 INFO L82 PathProgramCache]: Analyzing trace with hash 1638265627, now seen corresponding path program 15 times [2020-08-21 15:51:06,172 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:06,172 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [619242665] [2020-08-21 15:51:06,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:06,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:06,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:06,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:06,502 INFO L134 CoverageAnalysis]: Checked inductivity of 227 backedges. 2 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:06,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [619242665] [2020-08-21 15:51:06,503 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:06,503 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 15:51:06,503 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1631214411] [2020-08-21 15:51:06,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 15:51:06,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:06,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 15:51:06,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=292, Unknown=0, NotChecked=0, Total=342 [2020-08-21 15:51:06,505 INFO L87 Difference]: Start difference. First operand 46 states and 48 transitions. Second operand 19 states. [2020-08-21 15:51:07,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:07,037 INFO L93 Difference]: Finished difference Result 90 states and 95 transitions. [2020-08-21 15:51:07,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 15:51:07,037 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 45 [2020-08-21 15:51:07,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:07,038 INFO L225 Difference]: With dead ends: 90 [2020-08-21 15:51:07,038 INFO L226 Difference]: Without dead ends: 51 [2020-08-21 15:51:07,039 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=55, Invalid=325, Unknown=0, NotChecked=0, Total=380 [2020-08-21 15:51:07,039 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2020-08-21 15:51:07,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 48. [2020-08-21 15:51:07,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-21 15:51:07,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 50 transitions. [2020-08-21 15:51:07,045 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 50 transitions. Word has length 45 [2020-08-21 15:51:07,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:07,045 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 50 transitions. [2020-08-21 15:51:07,045 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 15:51:07,045 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 50 transitions. [2020-08-21 15:51:07,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-21 15:51:07,046 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:07,046 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:07,046 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 15:51:07,047 INFO L427 AbstractCegarLoop]: === Iteration 20 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:07,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:07,047 INFO L82 PathProgramCache]: Analyzing trace with hash -1178224903, now seen corresponding path program 16 times [2020-08-21 15:51:07,047 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:07,047 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1753944280] [2020-08-21 15:51:07,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:07,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:07,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:07,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:07,405 INFO L134 CoverageAnalysis]: Checked inductivity of 258 backedges. 2 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:07,405 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1753944280] [2020-08-21 15:51:07,406 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:07,406 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 15:51:07,406 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749594282] [2020-08-21 15:51:07,406 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 15:51:07,406 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:07,407 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 15:51:07,407 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=327, Unknown=0, NotChecked=0, Total=380 [2020-08-21 15:51:07,407 INFO L87 Difference]: Start difference. First operand 48 states and 50 transitions. Second operand 20 states. [2020-08-21 15:51:08,025 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:08,025 INFO L93 Difference]: Finished difference Result 94 states and 99 transitions. [2020-08-21 15:51:08,026 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 15:51:08,026 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 47 [2020-08-21 15:51:08,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:08,026 INFO L225 Difference]: With dead ends: 94 [2020-08-21 15:51:08,027 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 15:51:08,027 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=58, Invalid=362, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:51:08,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 15:51:08,032 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 50. [2020-08-21 15:51:08,032 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 50 states. [2020-08-21 15:51:08,032 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 52 transitions. [2020-08-21 15:51:08,033 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 52 transitions. Word has length 47 [2020-08-21 15:51:08,033 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:08,033 INFO L479 AbstractCegarLoop]: Abstraction has 50 states and 52 transitions. [2020-08-21 15:51:08,033 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 15:51:08,033 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 52 transitions. [2020-08-21 15:51:08,034 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2020-08-21 15:51:08,034 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:08,034 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:08,034 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 15:51:08,034 INFO L427 AbstractCegarLoop]: === Iteration 21 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:08,035 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:08,035 INFO L82 PathProgramCache]: Analyzing trace with hash -1996227753, now seen corresponding path program 17 times [2020-08-21 15:51:08,035 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:08,035 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [268323051] [2020-08-21 15:51:08,035 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:08,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,407 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:08,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:08,414 INFO L134 CoverageAnalysis]: Checked inductivity of 291 backedges. 2 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:08,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [268323051] [2020-08-21 15:51:08,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:08,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 15:51:08,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895380081] [2020-08-21 15:51:08,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 15:51:08,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:08,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 15:51:08,417 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=364, Unknown=0, NotChecked=0, Total=420 [2020-08-21 15:51:08,417 INFO L87 Difference]: Start difference. First operand 50 states and 52 transitions. Second operand 21 states. [2020-08-21 15:51:09,003 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:09,003 INFO L93 Difference]: Finished difference Result 98 states and 103 transitions. [2020-08-21 15:51:09,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 15:51:09,004 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 49 [2020-08-21 15:51:09,004 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:09,005 INFO L225 Difference]: With dead ends: 98 [2020-08-21 15:51:09,005 INFO L226 Difference]: Without dead ends: 55 [2020-08-21 15:51:09,005 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=61, Invalid=401, Unknown=0, NotChecked=0, Total=462 [2020-08-21 15:51:09,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2020-08-21 15:51:09,009 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 52. [2020-08-21 15:51:09,010 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 52 states. [2020-08-21 15:51:09,010 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 52 states to 52 states and 54 transitions. [2020-08-21 15:51:09,010 INFO L78 Accepts]: Start accepts. Automaton has 52 states and 54 transitions. Word has length 49 [2020-08-21 15:51:09,011 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:09,011 INFO L479 AbstractCegarLoop]: Abstraction has 52 states and 54 transitions. [2020-08-21 15:51:09,011 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 15:51:09,011 INFO L276 IsEmpty]: Start isEmpty. Operand 52 states and 54 transitions. [2020-08-21 15:51:09,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2020-08-21 15:51:09,012 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:09,012 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:09,012 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 15:51:09,012 INFO L427 AbstractCegarLoop]: === Iteration 22 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:09,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:09,013 INFO L82 PathProgramCache]: Analyzing trace with hash -2117951435, now seen corresponding path program 18 times [2020-08-21 15:51:09,013 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:09,013 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [152580163] [2020-08-21 15:51:09,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:09,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:09,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:09,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:09,448 INFO L134 CoverageAnalysis]: Checked inductivity of 326 backedges. 2 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:09,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [152580163] [2020-08-21 15:51:09,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:09,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 15:51:09,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [377002432] [2020-08-21 15:51:09,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 15:51:09,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:09,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 15:51:09,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=403, Unknown=0, NotChecked=0, Total=462 [2020-08-21 15:51:09,450 INFO L87 Difference]: Start difference. First operand 52 states and 54 transitions. Second operand 22 states. [2020-08-21 15:51:10,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:10,191 INFO L93 Difference]: Finished difference Result 102 states and 107 transitions. [2020-08-21 15:51:10,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 15:51:10,194 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 51 [2020-08-21 15:51:10,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:10,195 INFO L225 Difference]: With dead ends: 102 [2020-08-21 15:51:10,195 INFO L226 Difference]: Without dead ends: 57 [2020-08-21 15:51:10,196 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=64, Invalid=442, Unknown=0, NotChecked=0, Total=506 [2020-08-21 15:51:10,196 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-08-21 15:51:10,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 54. [2020-08-21 15:51:10,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 54 states. [2020-08-21 15:51:10,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 56 transitions. [2020-08-21 15:51:10,206 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 56 transitions. Word has length 51 [2020-08-21 15:51:10,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:10,209 INFO L479 AbstractCegarLoop]: Abstraction has 54 states and 56 transitions. [2020-08-21 15:51:10,209 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 15:51:10,210 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 56 transitions. [2020-08-21 15:51:10,210 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2020-08-21 15:51:10,210 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:10,210 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:10,210 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 15:51:10,211 INFO L427 AbstractCegarLoop]: === Iteration 23 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:10,211 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:10,211 INFO L82 PathProgramCache]: Analyzing trace with hash 1164674451, now seen corresponding path program 19 times [2020-08-21 15:51:10,211 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:10,211 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1291103398] [2020-08-21 15:51:10,211 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:10,240 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:10,690 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:10,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:10,698 INFO L134 CoverageAnalysis]: Checked inductivity of 363 backedges. 2 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:10,702 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1291103398] [2020-08-21 15:51:10,703 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:10,703 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 15:51:10,703 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917433193] [2020-08-21 15:51:10,704 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 15:51:10,704 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:10,704 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 15:51:10,705 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=444, Unknown=0, NotChecked=0, Total=506 [2020-08-21 15:51:10,705 INFO L87 Difference]: Start difference. First operand 54 states and 56 transitions. Second operand 23 states. [2020-08-21 15:51:11,448 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:11,448 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2020-08-21 15:51:11,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 15:51:11,449 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 53 [2020-08-21 15:51:11,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:11,450 INFO L225 Difference]: With dead ends: 106 [2020-08-21 15:51:11,450 INFO L226 Difference]: Without dead ends: 59 [2020-08-21 15:51:11,451 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=67, Invalid=485, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:51:11,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2020-08-21 15:51:11,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 56. [2020-08-21 15:51:11,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 56 states. [2020-08-21 15:51:11,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 58 transitions. [2020-08-21 15:51:11,456 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 58 transitions. Word has length 53 [2020-08-21 15:51:11,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:11,456 INFO L479 AbstractCegarLoop]: Abstraction has 56 states and 58 transitions. [2020-08-21 15:51:11,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 15:51:11,456 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 58 transitions. [2020-08-21 15:51:11,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2020-08-21 15:51:11,457 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:11,457 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:11,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 15:51:11,458 INFO L427 AbstractCegarLoop]: === Iteration 24 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:11,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:11,458 INFO L82 PathProgramCache]: Analyzing trace with hash -1032811663, now seen corresponding path program 20 times [2020-08-21 15:51:11,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:11,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [336611711] [2020-08-21 15:51:11,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:11,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:11,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:11,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:12,016 INFO L134 CoverageAnalysis]: Checked inductivity of 402 backedges. 2 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:12,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [336611711] [2020-08-21 15:51:12,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:12,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 15:51:12,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [795256237] [2020-08-21 15:51:12,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 15:51:12,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:12,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 15:51:12,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=487, Unknown=0, NotChecked=0, Total=552 [2020-08-21 15:51:12,018 INFO L87 Difference]: Start difference. First operand 56 states and 58 transitions. Second operand 24 states. [2020-08-21 15:51:12,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:12,769 INFO L93 Difference]: Finished difference Result 110 states and 115 transitions. [2020-08-21 15:51:12,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 15:51:12,770 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 55 [2020-08-21 15:51:12,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:12,770 INFO L225 Difference]: With dead ends: 110 [2020-08-21 15:51:12,770 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 15:51:12,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=70, Invalid=530, Unknown=0, NotChecked=0, Total=600 [2020-08-21 15:51:12,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 15:51:12,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 58. [2020-08-21 15:51:12,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 58 states. [2020-08-21 15:51:12,776 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 60 transitions. [2020-08-21 15:51:12,776 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 60 transitions. Word has length 55 [2020-08-21 15:51:12,776 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:12,776 INFO L479 AbstractCegarLoop]: Abstraction has 58 states and 60 transitions. [2020-08-21 15:51:12,777 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 15:51:12,777 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 60 transitions. [2020-08-21 15:51:12,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2020-08-21 15:51:12,777 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:12,777 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:12,778 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 15:51:12,778 INFO L427 AbstractCegarLoop]: === Iteration 25 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:12,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:12,778 INFO L82 PathProgramCache]: Analyzing trace with hash 306942415, now seen corresponding path program 21 times [2020-08-21 15:51:12,778 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:12,779 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2124465671] [2020-08-21 15:51:12,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:12,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:13,343 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:13,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:13,351 INFO L134 CoverageAnalysis]: Checked inductivity of 443 backedges. 2 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:13,351 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2124465671] [2020-08-21 15:51:13,351 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:13,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 15:51:13,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849949114] [2020-08-21 15:51:13,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 15:51:13,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:13,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 15:51:13,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=532, Unknown=0, NotChecked=0, Total=600 [2020-08-21 15:51:13,353 INFO L87 Difference]: Start difference. First operand 58 states and 60 transitions. Second operand 25 states. [2020-08-21 15:51:14,186 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:14,187 INFO L93 Difference]: Finished difference Result 114 states and 119 transitions. [2020-08-21 15:51:14,187 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 15:51:14,187 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 57 [2020-08-21 15:51:14,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:14,188 INFO L225 Difference]: With dead ends: 114 [2020-08-21 15:51:14,188 INFO L226 Difference]: Without dead ends: 63 [2020-08-21 15:51:14,189 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=73, Invalid=577, Unknown=0, NotChecked=0, Total=650 [2020-08-21 15:51:14,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2020-08-21 15:51:14,192 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 60. [2020-08-21 15:51:14,193 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 60 states. [2020-08-21 15:51:14,193 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 62 transitions. [2020-08-21 15:51:14,193 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 62 transitions. Word has length 57 [2020-08-21 15:51:14,193 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:14,193 INFO L479 AbstractCegarLoop]: Abstraction has 60 states and 62 transitions. [2020-08-21 15:51:14,193 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 15:51:14,194 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 62 transitions. [2020-08-21 15:51:14,194 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2020-08-21 15:51:14,194 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:14,194 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:14,194 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 15:51:14,195 INFO L427 AbstractCegarLoop]: === Iteration 26 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:14,195 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:14,195 INFO L82 PathProgramCache]: Analyzing trace with hash -679577427, now seen corresponding path program 22 times [2020-08-21 15:51:14,195 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:14,195 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1704291077] [2020-08-21 15:51:14,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:14,226 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:14,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:14,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:14,808 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 2 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:14,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1704291077] [2020-08-21 15:51:14,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:14,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 15:51:14,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1559909941] [2020-08-21 15:51:14,809 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 15:51:14,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:14,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 15:51:14,810 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=71, Invalid=579, Unknown=0, NotChecked=0, Total=650 [2020-08-21 15:51:14,810 INFO L87 Difference]: Start difference. First operand 60 states and 62 transitions. Second operand 26 states. [2020-08-21 15:51:15,757 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:15,757 INFO L93 Difference]: Finished difference Result 118 states and 123 transitions. [2020-08-21 15:51:15,758 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 15:51:15,758 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 59 [2020-08-21 15:51:15,759 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:15,759 INFO L225 Difference]: With dead ends: 118 [2020-08-21 15:51:15,759 INFO L226 Difference]: Without dead ends: 65 [2020-08-21 15:51:15,760 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=76, Invalid=626, Unknown=0, NotChecked=0, Total=702 [2020-08-21 15:51:15,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2020-08-21 15:51:15,764 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 62. [2020-08-21 15:51:15,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 62 states. [2020-08-21 15:51:15,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 64 transitions. [2020-08-21 15:51:15,765 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 64 transitions. Word has length 59 [2020-08-21 15:51:15,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:15,765 INFO L479 AbstractCegarLoop]: Abstraction has 62 states and 64 transitions. [2020-08-21 15:51:15,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 15:51:15,765 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 64 transitions. [2020-08-21 15:51:15,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2020-08-21 15:51:15,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:15,766 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:15,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 15:51:15,766 INFO L427 AbstractCegarLoop]: === Iteration 27 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:15,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:15,767 INFO L82 PathProgramCache]: Analyzing trace with hash 462626827, now seen corresponding path program 23 times [2020-08-21 15:51:15,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:15,767 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [637479710] [2020-08-21 15:51:15,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:15,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:16,372 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:16,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:16,381 INFO L134 CoverageAnalysis]: Checked inductivity of 531 backedges. 2 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:16,381 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [637479710] [2020-08-21 15:51:16,381 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:16,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 15:51:16,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1636706148] [2020-08-21 15:51:16,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 15:51:16,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:16,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 15:51:16,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=628, Unknown=0, NotChecked=0, Total=702 [2020-08-21 15:51:16,383 INFO L87 Difference]: Start difference. First operand 62 states and 64 transitions. Second operand 27 states. [2020-08-21 15:51:17,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:17,477 INFO L93 Difference]: Finished difference Result 122 states and 127 transitions. [2020-08-21 15:51:17,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 15:51:17,481 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 61 [2020-08-21 15:51:17,481 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:17,482 INFO L225 Difference]: With dead ends: 122 [2020-08-21 15:51:17,482 INFO L226 Difference]: Without dead ends: 67 [2020-08-21 15:51:17,483 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=79, Invalid=677, Unknown=0, NotChecked=0, Total=756 [2020-08-21 15:51:17,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2020-08-21 15:51:17,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 64. [2020-08-21 15:51:17,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 64 states. [2020-08-21 15:51:17,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 66 transitions. [2020-08-21 15:51:17,487 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 66 transitions. Word has length 61 [2020-08-21 15:51:17,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:17,487 INFO L479 AbstractCegarLoop]: Abstraction has 64 states and 66 transitions. [2020-08-21 15:51:17,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 15:51:17,487 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 66 transitions. [2020-08-21 15:51:17,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2020-08-21 15:51:17,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:17,488 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:17,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 15:51:17,488 INFO L427 AbstractCegarLoop]: === Iteration 28 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:17,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:17,488 INFO L82 PathProgramCache]: Analyzing trace with hash -1390712855, now seen corresponding path program 24 times [2020-08-21 15:51:17,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:17,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [595391741] [2020-08-21 15:51:17,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:17,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:18,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:18,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:18,221 INFO L134 CoverageAnalysis]: Checked inductivity of 578 backedges. 2 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:18,221 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [595391741] [2020-08-21 15:51:18,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:18,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 15:51:18,222 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565182272] [2020-08-21 15:51:18,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 15:51:18,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:18,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 15:51:18,223 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=679, Unknown=0, NotChecked=0, Total=756 [2020-08-21 15:51:18,223 INFO L87 Difference]: Start difference. First operand 64 states and 66 transitions. Second operand 28 states. [2020-08-21 15:51:19,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:19,345 INFO L93 Difference]: Finished difference Result 126 states and 131 transitions. [2020-08-21 15:51:19,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 15:51:19,353 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 63 [2020-08-21 15:51:19,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:19,354 INFO L225 Difference]: With dead ends: 126 [2020-08-21 15:51:19,354 INFO L226 Difference]: Without dead ends: 69 [2020-08-21 15:51:19,355 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=82, Invalid=730, Unknown=0, NotChecked=0, Total=812 [2020-08-21 15:51:19,355 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2020-08-21 15:51:19,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 66. [2020-08-21 15:51:19,360 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 66 states. [2020-08-21 15:51:19,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 68 transitions. [2020-08-21 15:51:19,361 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 68 transitions. Word has length 63 [2020-08-21 15:51:19,361 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:19,361 INFO L479 AbstractCegarLoop]: Abstraction has 66 states and 68 transitions. [2020-08-21 15:51:19,361 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 15:51:19,361 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 68 transitions. [2020-08-21 15:51:19,362 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2020-08-21 15:51:19,362 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:19,362 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:19,362 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 15:51:19,362 INFO L427 AbstractCegarLoop]: === Iteration 29 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:19,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:19,363 INFO L82 PathProgramCache]: Analyzing trace with hash -38719417, now seen corresponding path program 25 times [2020-08-21 15:51:19,363 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:19,363 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2053718499] [2020-08-21 15:51:19,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:19,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:20,199 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:20,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:20,217 INFO L134 CoverageAnalysis]: Checked inductivity of 627 backedges. 2 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:20,217 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2053718499] [2020-08-21 15:51:20,217 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:20,217 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 15:51:20,218 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1594690596] [2020-08-21 15:51:20,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 15:51:20,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:20,219 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 15:51:20,219 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=732, Unknown=0, NotChecked=0, Total=812 [2020-08-21 15:51:20,219 INFO L87 Difference]: Start difference. First operand 66 states and 68 transitions. Second operand 29 states. [2020-08-21 15:51:21,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:21,543 INFO L93 Difference]: Finished difference Result 130 states and 135 transitions. [2020-08-21 15:51:21,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 15:51:21,543 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 65 [2020-08-21 15:51:21,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:21,544 INFO L225 Difference]: With dead ends: 130 [2020-08-21 15:51:21,544 INFO L226 Difference]: Without dead ends: 71 [2020-08-21 15:51:21,545 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=85, Invalid=785, Unknown=0, NotChecked=0, Total=870 [2020-08-21 15:51:21,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2020-08-21 15:51:21,552 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 68. [2020-08-21 15:51:21,552 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 68 states. [2020-08-21 15:51:21,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2020-08-21 15:51:21,553 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 65 [2020-08-21 15:51:21,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:21,553 INFO L479 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2020-08-21 15:51:21,553 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 15:51:21,553 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2020-08-21 15:51:21,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2020-08-21 15:51:21,554 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:21,554 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:21,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 15:51:21,554 INFO L427 AbstractCegarLoop]: === Iteration 30 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:21,554 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:21,554 INFO L82 PathProgramCache]: Analyzing trace with hash 2146851109, now seen corresponding path program 26 times [2020-08-21 15:51:21,554 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:21,555 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1854269959] [2020-08-21 15:51:21,555 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:21,598 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:22,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:22,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:22,307 INFO L134 CoverageAnalysis]: Checked inductivity of 678 backedges. 2 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:22,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1854269959] [2020-08-21 15:51:22,307 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:22,307 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 15:51:22,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874889780] [2020-08-21 15:51:22,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 15:51:22,308 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:22,308 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 15:51:22,308 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=787, Unknown=0, NotChecked=0, Total=870 [2020-08-21 15:51:22,309 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand 30 states. [2020-08-21 15:51:23,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:23,663 INFO L93 Difference]: Finished difference Result 134 states and 139 transitions. [2020-08-21 15:51:23,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 15:51:23,668 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 67 [2020-08-21 15:51:23,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:23,669 INFO L225 Difference]: With dead ends: 134 [2020-08-21 15:51:23,669 INFO L226 Difference]: Without dead ends: 73 [2020-08-21 15:51:23,670 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=88, Invalid=842, Unknown=0, NotChecked=0, Total=930 [2020-08-21 15:51:23,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2020-08-21 15:51:23,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 70. [2020-08-21 15:51:23,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 70 states. [2020-08-21 15:51:23,675 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 72 transitions. [2020-08-21 15:51:23,675 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 72 transitions. Word has length 67 [2020-08-21 15:51:23,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:23,676 INFO L479 AbstractCegarLoop]: Abstraction has 70 states and 72 transitions. [2020-08-21 15:51:23,676 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 15:51:23,676 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 72 transitions. [2020-08-21 15:51:23,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2020-08-21 15:51:23,676 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:23,677 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:23,677 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 15:51:23,677 INFO L427 AbstractCegarLoop]: === Iteration 31 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:23,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:23,677 INFO L82 PathProgramCache]: Analyzing trace with hash -2053848445, now seen corresponding path program 27 times [2020-08-21 15:51:23,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:23,678 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1460946261] [2020-08-21 15:51:23,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:23,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:24,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:24,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:24,528 INFO L134 CoverageAnalysis]: Checked inductivity of 731 backedges. 2 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:24,528 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1460946261] [2020-08-21 15:51:24,529 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:24,529 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 15:51:24,529 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726096843] [2020-08-21 15:51:24,529 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 15:51:24,529 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:24,529 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 15:51:24,530 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=844, Unknown=0, NotChecked=0, Total=930 [2020-08-21 15:51:24,530 INFO L87 Difference]: Start difference. First operand 70 states and 72 transitions. Second operand 31 states. [2020-08-21 15:51:25,886 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:25,886 INFO L93 Difference]: Finished difference Result 138 states and 143 transitions. [2020-08-21 15:51:25,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 15:51:25,894 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 69 [2020-08-21 15:51:25,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:25,895 INFO L225 Difference]: With dead ends: 138 [2020-08-21 15:51:25,895 INFO L226 Difference]: Without dead ends: 75 [2020-08-21 15:51:25,896 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=91, Invalid=901, Unknown=0, NotChecked=0, Total=992 [2020-08-21 15:51:25,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2020-08-21 15:51:25,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 72. [2020-08-21 15:51:25,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 72 states. [2020-08-21 15:51:25,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 72 states to 72 states and 74 transitions. [2020-08-21 15:51:25,900 INFO L78 Accepts]: Start accepts. Automaton has 72 states and 74 transitions. Word has length 69 [2020-08-21 15:51:25,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:25,901 INFO L479 AbstractCegarLoop]: Abstraction has 72 states and 74 transitions. [2020-08-21 15:51:25,901 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 15:51:25,901 INFO L276 IsEmpty]: Start isEmpty. Operand 72 states and 74 transitions. [2020-08-21 15:51:25,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2020-08-21 15:51:25,901 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:25,901 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:25,902 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 15:51:25,902 INFO L427 AbstractCegarLoop]: === Iteration 32 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:25,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:25,902 INFO L82 PathProgramCache]: Analyzing trace with hash -1656861599, now seen corresponding path program 28 times [2020-08-21 15:51:25,902 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:25,902 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079215717] [2020-08-21 15:51:25,902 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:25,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:26,809 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:26,810 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:26,826 INFO L134 CoverageAnalysis]: Checked inductivity of 786 backedges. 2 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:26,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079215717] [2020-08-21 15:51:26,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:26,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 15:51:26,827 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1346377989] [2020-08-21 15:51:26,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 15:51:26,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:26,829 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 15:51:26,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=903, Unknown=0, NotChecked=0, Total=992 [2020-08-21 15:51:26,830 INFO L87 Difference]: Start difference. First operand 72 states and 74 transitions. Second operand 32 states. [2020-08-21 15:51:28,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:28,454 INFO L93 Difference]: Finished difference Result 142 states and 147 transitions. [2020-08-21 15:51:28,455 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 15:51:28,456 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 71 [2020-08-21 15:51:28,456 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:28,456 INFO L225 Difference]: With dead ends: 142 [2020-08-21 15:51:28,456 INFO L226 Difference]: Without dead ends: 77 [2020-08-21 15:51:28,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=94, Invalid=962, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 15:51:28,458 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2020-08-21 15:51:28,462 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 74. [2020-08-21 15:51:28,462 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 74 states. [2020-08-21 15:51:28,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2020-08-21 15:51:28,463 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 71 [2020-08-21 15:51:28,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:28,463 INFO L479 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2020-08-21 15:51:28,463 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 15:51:28,463 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2020-08-21 15:51:28,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2020-08-21 15:51:28,464 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:28,464 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:28,464 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 15:51:28,464 INFO L427 AbstractCegarLoop]: === Iteration 33 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:28,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:28,465 INFO L82 PathProgramCache]: Analyzing trace with hash 1890375359, now seen corresponding path program 29 times [2020-08-21 15:51:28,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:28,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1124442067] [2020-08-21 15:51:28,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:28,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:29,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:29,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:29,422 INFO L134 CoverageAnalysis]: Checked inductivity of 843 backedges. 2 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:29,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1124442067] [2020-08-21 15:51:29,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:29,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 15:51:29,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [395415676] [2020-08-21 15:51:29,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 15:51:29,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:29,424 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 15:51:29,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=964, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 15:51:29,424 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand 33 states. [2020-08-21 15:51:31,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:31,070 INFO L93 Difference]: Finished difference Result 146 states and 151 transitions. [2020-08-21 15:51:31,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 15:51:31,071 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 73 [2020-08-21 15:51:31,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:31,072 INFO L225 Difference]: With dead ends: 146 [2020-08-21 15:51:31,072 INFO L226 Difference]: Without dead ends: 79 [2020-08-21 15:51:31,073 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=97, Invalid=1025, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 15:51:31,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2020-08-21 15:51:31,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 76. [2020-08-21 15:51:31,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 76 states. [2020-08-21 15:51:31,077 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 78 transitions. [2020-08-21 15:51:31,077 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 78 transitions. Word has length 73 [2020-08-21 15:51:31,078 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:31,078 INFO L479 AbstractCegarLoop]: Abstraction has 76 states and 78 transitions. [2020-08-21 15:51:31,078 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 15:51:31,078 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 78 transitions. [2020-08-21 15:51:31,079 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2020-08-21 15:51:31,079 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:31,079 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:31,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 15:51:31,079 INFO L427 AbstractCegarLoop]: === Iteration 34 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:31,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:31,080 INFO L82 PathProgramCache]: Analyzing trace with hash 581058973, now seen corresponding path program 30 times [2020-08-21 15:51:31,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:31,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1463705974] [2020-08-21 15:51:31,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:31,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:32,054 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:32,055 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:32,066 INFO L134 CoverageAnalysis]: Checked inductivity of 902 backedges. 2 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:32,067 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1463705974] [2020-08-21 15:51:32,067 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:32,067 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 15:51:32,067 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1997708306] [2020-08-21 15:51:32,068 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 15:51:32,068 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:32,068 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 15:51:32,069 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=1027, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 15:51:32,069 INFO L87 Difference]: Start difference. First operand 76 states and 78 transitions. Second operand 34 states. [2020-08-21 15:51:33,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:33,875 INFO L93 Difference]: Finished difference Result 150 states and 155 transitions. [2020-08-21 15:51:33,875 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 15:51:33,876 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 75 [2020-08-21 15:51:33,876 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:33,877 INFO L225 Difference]: With dead ends: 150 [2020-08-21 15:51:33,877 INFO L226 Difference]: Without dead ends: 81 [2020-08-21 15:51:33,877 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=100, Invalid=1090, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 15:51:33,878 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2020-08-21 15:51:33,882 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 78. [2020-08-21 15:51:33,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 78 states. [2020-08-21 15:51:33,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2020-08-21 15:51:33,883 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 75 [2020-08-21 15:51:33,883 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:33,883 INFO L479 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2020-08-21 15:51:33,883 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 15:51:33,883 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2020-08-21 15:51:33,884 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2020-08-21 15:51:33,884 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:33,884 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:33,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 15:51:33,884 INFO L427 AbstractCegarLoop]: === Iteration 35 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:33,885 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:33,885 INFO L82 PathProgramCache]: Analyzing trace with hash 753429755, now seen corresponding path program 31 times [2020-08-21 15:51:33,885 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:33,885 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1005993574] [2020-08-21 15:51:33,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:33,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:34,916 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:34,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:34,928 INFO L134 CoverageAnalysis]: Checked inductivity of 963 backedges. 2 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:34,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1005993574] [2020-08-21 15:51:34,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:34,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 15:51:34,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573425688] [2020-08-21 15:51:34,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 15:51:34,929 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:34,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 15:51:34,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=1092, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 15:51:34,930 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand 35 states. [2020-08-21 15:51:36,820 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:36,820 INFO L93 Difference]: Finished difference Result 154 states and 159 transitions. [2020-08-21 15:51:36,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 15:51:36,821 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 77 [2020-08-21 15:51:36,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:36,822 INFO L225 Difference]: With dead ends: 154 [2020-08-21 15:51:36,822 INFO L226 Difference]: Without dead ends: 83 [2020-08-21 15:51:36,823 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=103, Invalid=1157, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 15:51:36,823 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2020-08-21 15:51:36,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 80. [2020-08-21 15:51:36,827 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 80 states. [2020-08-21 15:51:36,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 82 transitions. [2020-08-21 15:51:36,828 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 82 transitions. Word has length 77 [2020-08-21 15:51:36,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:36,828 INFO L479 AbstractCegarLoop]: Abstraction has 80 states and 82 transitions. [2020-08-21 15:51:36,828 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 15:51:36,829 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 82 transitions. [2020-08-21 15:51:36,829 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2020-08-21 15:51:36,829 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:36,829 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:36,829 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 15:51:36,829 INFO L427 AbstractCegarLoop]: === Iteration 36 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:36,830 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:36,830 INFO L82 PathProgramCache]: Analyzing trace with hash -1101973287, now seen corresponding path program 32 times [2020-08-21 15:51:36,830 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:36,830 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194777839] [2020-08-21 15:51:36,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:36,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:37,915 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:37,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:37,927 INFO L134 CoverageAnalysis]: Checked inductivity of 1026 backedges. 2 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:37,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194777839] [2020-08-21 15:51:37,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:37,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 15:51:37,928 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [6909469] [2020-08-21 15:51:37,928 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 15:51:37,929 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:37,929 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 15:51:37,929 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=101, Invalid=1159, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 15:51:37,929 INFO L87 Difference]: Start difference. First operand 80 states and 82 transitions. Second operand 36 states. [2020-08-21 15:51:39,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:39,930 INFO L93 Difference]: Finished difference Result 158 states and 163 transitions. [2020-08-21 15:51:39,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 15:51:39,931 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 79 [2020-08-21 15:51:39,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:39,932 INFO L225 Difference]: With dead ends: 158 [2020-08-21 15:51:39,932 INFO L226 Difference]: Without dead ends: 85 [2020-08-21 15:51:39,933 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=106, Invalid=1226, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 15:51:39,933 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2020-08-21 15:51:39,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 82. [2020-08-21 15:51:39,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 82 states. [2020-08-21 15:51:39,937 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 84 transitions. [2020-08-21 15:51:39,937 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 84 transitions. Word has length 79 [2020-08-21 15:51:39,938 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:39,938 INFO L479 AbstractCegarLoop]: Abstraction has 82 states and 84 transitions. [2020-08-21 15:51:39,938 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 15:51:39,938 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 84 transitions. [2020-08-21 15:51:39,938 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2020-08-21 15:51:39,939 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:39,939 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:39,939 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 15:51:39,939 INFO L427 AbstractCegarLoop]: === Iteration 37 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:39,939 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:39,939 INFO L82 PathProgramCache]: Analyzing trace with hash -1732868809, now seen corresponding path program 33 times [2020-08-21 15:51:39,939 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:39,940 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [255552601] [2020-08-21 15:51:39,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:39,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:41,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:41,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:41,138 INFO L134 CoverageAnalysis]: Checked inductivity of 1091 backedges. 2 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:41,138 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [255552601] [2020-08-21 15:51:41,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:41,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 15:51:41,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1483780279] [2020-08-21 15:51:41,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 15:51:41,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:41,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 15:51:41,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=1228, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 15:51:41,140 INFO L87 Difference]: Start difference. First operand 82 states and 84 transitions. Second operand 37 states. [2020-08-21 15:51:43,145 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:43,146 INFO L93 Difference]: Finished difference Result 162 states and 167 transitions. [2020-08-21 15:51:43,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 15:51:43,147 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 81 [2020-08-21 15:51:43,148 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:43,148 INFO L225 Difference]: With dead ends: 162 [2020-08-21 15:51:43,148 INFO L226 Difference]: Without dead ends: 87 [2020-08-21 15:51:43,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=109, Invalid=1297, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 15:51:43,150 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2020-08-21 15:51:43,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 84. [2020-08-21 15:51:43,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 84 states. [2020-08-21 15:51:43,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 86 transitions. [2020-08-21 15:51:43,155 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 86 transitions. Word has length 81 [2020-08-21 15:51:43,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:43,155 INFO L479 AbstractCegarLoop]: Abstraction has 84 states and 86 transitions. [2020-08-21 15:51:43,156 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 15:51:43,156 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 86 transitions. [2020-08-21 15:51:43,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2020-08-21 15:51:43,156 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:43,157 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:43,157 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 15:51:43,157 INFO L427 AbstractCegarLoop]: === Iteration 38 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:43,157 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:43,157 INFO L82 PathProgramCache]: Analyzing trace with hash 1861890581, now seen corresponding path program 34 times [2020-08-21 15:51:43,157 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:43,158 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1350359612] [2020-08-21 15:51:43,158 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:43,198 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:44,417 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:44,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:44,429 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 2 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:44,430 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1350359612] [2020-08-21 15:51:44,430 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:44,430 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 15:51:44,430 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137726381] [2020-08-21 15:51:44,431 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 15:51:44,431 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:44,431 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 15:51:44,432 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=1299, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 15:51:44,432 INFO L87 Difference]: Start difference. First operand 84 states and 86 transitions. Second operand 38 states. [2020-08-21 15:51:46,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:46,632 INFO L93 Difference]: Finished difference Result 166 states and 171 transitions. [2020-08-21 15:51:46,634 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 15:51:46,634 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 83 [2020-08-21 15:51:46,635 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:46,635 INFO L225 Difference]: With dead ends: 166 [2020-08-21 15:51:46,635 INFO L226 Difference]: Without dead ends: 89 [2020-08-21 15:51:46,636 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=112, Invalid=1370, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 15:51:46,636 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2020-08-21 15:51:46,640 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 86. [2020-08-21 15:51:46,640 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 86 states. [2020-08-21 15:51:46,641 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 88 transitions. [2020-08-21 15:51:46,641 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 88 transitions. Word has length 83 [2020-08-21 15:51:46,641 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:46,641 INFO L479 AbstractCegarLoop]: Abstraction has 86 states and 88 transitions. [2020-08-21 15:51:46,641 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 15:51:46,641 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 88 transitions. [2020-08-21 15:51:46,642 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 86 [2020-08-21 15:51:46,642 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:46,642 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:46,643 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 15:51:46,643 INFO L427 AbstractCegarLoop]: === Iteration 39 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:46,643 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:46,643 INFO L82 PathProgramCache]: Analyzing trace with hash -1023008909, now seen corresponding path program 35 times [2020-08-21 15:51:46,643 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:46,643 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [101505976] [2020-08-21 15:51:46,643 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:46,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:47,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:47,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:48,008 INFO L134 CoverageAnalysis]: Checked inductivity of 1227 backedges. 2 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:48,008 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [101505976] [2020-08-21 15:51:48,008 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:48,008 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 15:51:48,009 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733702552] [2020-08-21 15:51:48,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 15:51:48,009 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:48,009 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 15:51:48,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=1372, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 15:51:48,010 INFO L87 Difference]: Start difference. First operand 86 states and 88 transitions. Second operand 39 states. [2020-08-21 15:51:50,328 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:50,328 INFO L93 Difference]: Finished difference Result 170 states and 175 transitions. [2020-08-21 15:51:50,329 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 15:51:50,329 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 85 [2020-08-21 15:51:50,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:50,330 INFO L225 Difference]: With dead ends: 170 [2020-08-21 15:51:50,331 INFO L226 Difference]: Without dead ends: 91 [2020-08-21 15:51:50,332 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=115, Invalid=1445, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 15:51:50,332 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2020-08-21 15:51:50,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 88. [2020-08-21 15:51:50,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 88 states. [2020-08-21 15:51:50,338 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 88 states to 88 states and 90 transitions. [2020-08-21 15:51:50,338 INFO L78 Accepts]: Start accepts. Automaton has 88 states and 90 transitions. Word has length 85 [2020-08-21 15:51:50,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:50,338 INFO L479 AbstractCegarLoop]: Abstraction has 88 states and 90 transitions. [2020-08-21 15:51:50,339 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 15:51:50,339 INFO L276 IsEmpty]: Start isEmpty. Operand 88 states and 90 transitions. [2020-08-21 15:51:50,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2020-08-21 15:51:50,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:50,340 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:50,340 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 15:51:50,340 INFO L427 AbstractCegarLoop]: === Iteration 40 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:50,340 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:50,340 INFO L82 PathProgramCache]: Analyzing trace with hash 1137454417, now seen corresponding path program 36 times [2020-08-21 15:51:50,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:50,341 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [225656505] [2020-08-21 15:51:50,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:50,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:51,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:51,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:51,780 INFO L134 CoverageAnalysis]: Checked inductivity of 1298 backedges. 2 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:51,780 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [225656505] [2020-08-21 15:51:51,781 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:51,781 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 15:51:51,781 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1720793503] [2020-08-21 15:51:51,781 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 15:51:51,781 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:51,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 15:51:51,782 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1447, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 15:51:51,782 INFO L87 Difference]: Start difference. First operand 88 states and 90 transitions. Second operand 40 states. [2020-08-21 15:51:54,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:54,274 INFO L93 Difference]: Finished difference Result 174 states and 179 transitions. [2020-08-21 15:51:54,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 15:51:54,280 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 87 [2020-08-21 15:51:54,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:54,281 INFO L225 Difference]: With dead ends: 174 [2020-08-21 15:51:54,281 INFO L226 Difference]: Without dead ends: 93 [2020-08-21 15:51:54,282 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=118, Invalid=1522, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 15:51:54,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2020-08-21 15:51:54,287 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 90. [2020-08-21 15:51:54,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 90 states. [2020-08-21 15:51:54,288 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 92 transitions. [2020-08-21 15:51:54,289 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 92 transitions. Word has length 87 [2020-08-21 15:51:54,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:54,289 INFO L479 AbstractCegarLoop]: Abstraction has 90 states and 92 transitions. [2020-08-21 15:51:54,289 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 15:51:54,289 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 92 transitions. [2020-08-21 15:51:54,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2020-08-21 15:51:54,290 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:54,290 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:54,290 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 15:51:54,290 INFO L427 AbstractCegarLoop]: === Iteration 41 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:54,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:54,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1421460561, now seen corresponding path program 37 times [2020-08-21 15:51:54,291 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:54,291 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [173686040] [2020-08-21 15:51:54,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:54,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:55,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 15:51:55,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 15:51:55,791 INFO L134 CoverageAnalysis]: Checked inductivity of 1371 backedges. 2 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 15:51:55,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [173686040] [2020-08-21 15:51:55,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 15:51:55,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 15:51:55,792 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [9048493] [2020-08-21 15:51:55,792 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 15:51:55,792 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 15:51:55,793 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 15:51:55,793 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=1524, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 15:51:55,793 INFO L87 Difference]: Start difference. First operand 90 states and 92 transitions. Second operand 41 states. [2020-08-21 15:51:58,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 15:51:58,319 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2020-08-21 15:51:58,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 15:51:58,321 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 89 [2020-08-21 15:51:58,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 15:51:58,322 INFO L225 Difference]: With dead ends: 178 [2020-08-21 15:51:58,322 INFO L226 Difference]: Without dead ends: 95 [2020-08-21 15:51:58,323 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=121, Invalid=1601, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 15:51:58,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2020-08-21 15:51:58,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 92. [2020-08-21 15:51:58,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 92 states. [2020-08-21 15:51:58,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 94 transitions. [2020-08-21 15:51:58,328 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 94 transitions. Word has length 89 [2020-08-21 15:51:58,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 15:51:58,328 INFO L479 AbstractCegarLoop]: Abstraction has 92 states and 94 transitions. [2020-08-21 15:51:58,328 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 15:51:58,328 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 94 transitions. [2020-08-21 15:51:58,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2020-08-21 15:51:58,329 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 15:51:58,329 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 15:51:58,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 15:51:58,329 INFO L427 AbstractCegarLoop]: === Iteration 42 === [mainErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 15:51:58,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 15:51:58,330 INFO L82 PathProgramCache]: Analyzing trace with hash 477506189, now seen corresponding path program 38 times [2020-08-21 15:51:58,330 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 15:51:58,330 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1233438909] [2020-08-21 15:51:58,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 15:51:58,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat