/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=NARROWEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 21:28:49,276 INFO L177 SettingsManager]: Resetting all preferences to default values... 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[2020-08-21 21:28:49,302 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 21:28:49,303 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 21:28:49,304 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 21:28:49,306 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 21:28:49,307 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 21:28:49,308 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 21:28:49,309 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 21:28:49,310 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 21:28:49,310 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 21:28:49,311 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 21:28:49,312 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 21:28:49,313 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 21:28:49,314 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 21:28:49,315 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 21:28:49,317 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 21:28:49,318 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 21:28:49,320 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 21:28:49,321 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 21:28:49,322 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 21:28:49,323 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 21:28:49,328 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 21:28:49,335 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 21:28:49,336 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 21:28:49,336 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 21:28:49,337 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 21:28:49,364 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 21:28:49,365 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 21:28:49,368 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 21:28:49,368 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 21:28:49,368 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 21:28:49,369 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 21:28:49,369 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 21:28:49,369 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 21:28:49,369 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 21:28:49,370 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 21:28:49,370 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 21:28:49,370 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 21:28:49,370 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 21:28:49,370 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 21:28:49,370 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 21:28:49,372 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 21:28:49,372 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 21:28:49,373 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 21:28:49,373 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 21:28:49,373 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 21:28:49,373 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 21:28:49,373 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 21:28:49,374 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 21:28:49,374 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 21:28:49,374 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 21:28:49,374 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 21:28:49,375 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 21:28:49,375 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 21:28:49,375 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 21:28:49,375 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=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=NARROWEST;log-additional-information=true; [2020-08-21 21:28:49,714 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 21:28:49,733 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 21:28:49,738 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 21:28:49,740 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 21:28:49,741 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 21:28:49,741 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-21 21:28:49,820 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d1e1c6ecd/1d0e310b1339443cbe31b1f959fdc899/FLAG53656b8c3 [2020-08-21 21:28:50,291 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 21:28:50,291 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-21 21:28:50,299 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d1e1c6ecd/1d0e310b1339443cbe31b1f959fdc899/FLAG53656b8c3 [2020-08-21 21:28:50,683 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/d1e1c6ecd/1d0e310b1339443cbe31b1f959fdc899 [2020-08-21 21:28:50,693 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 21:28:50,695 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 21:28:50,697 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 21:28:50,697 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 21:28:50,700 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 21:28:50,701 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:28:50" (1/1) ... [2020-08-21 21:28:50,705 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2dfcebea and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:50, skipping insertion in model container [2020-08-21 21:28:50,705 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 09:28:50" (1/1) ... [2020-08-21 21:28:50,713 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 21:28:50,731 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 21:28:50,902 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:28:50,909 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 21:28:50,930 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 21:28:50,946 INFO L208 MainTranslator]: Completed translation [2020-08-21 21:28:50,946 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:50 WrapperNode [2020-08-21 21:28:50,947 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 21:28:50,947 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 21:28:50,948 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 21:28:50,948 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 21:28:51,054 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:50" (1/1) ... [2020-08-21 21:28:51,055 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:50" (1/1) ... [2020-08-21 21:28:51,063 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:50" (1/1) ... [2020-08-21 21:28:51,063 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:50" (1/1) ... [2020-08-21 21:28:51,072 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:50" (1/1) ... [2020-08-21 21:28:51,078 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:50" (1/1) ... [2020-08-21 21:28:51,079 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:50" (1/1) ... [2020-08-21 21:28:51,082 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 21:28:51,082 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 21:28:51,082 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 21:28:51,082 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 21:28:51,083 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:50" (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 21:28:51,144 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 21:28:51,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 21:28:51,145 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 21:28:51,145 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-21 21:28:51,145 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 21:28:51,146 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 21:28:51,146 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 21:28:51,146 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 21:28:51,146 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 21:28:51,146 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 21:28:51,146 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 21:28:51,147 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 21:28:51,147 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 21:28:51,147 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 21:28:51,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 21:28:51,147 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 21:28:51,148 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 21:28:51,413 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 21:28:51,413 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 21:28:51,418 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:28:51 BoogieIcfgContainer [2020-08-21 21:28:51,418 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 21:28:51,420 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 21:28:51,420 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 21:28:51,423 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 21:28:51,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 09:28:50" (1/3) ... [2020-08-21 21:28:51,424 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19a4f00a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:28:51, skipping insertion in model container [2020-08-21 21:28:51,424 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 09:28:50" (2/3) ... [2020-08-21 21:28:51,425 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@19a4f00a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 09:28:51, skipping insertion in model container [2020-08-21 21:28:51,425 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 09:28:51" (3/3) ... [2020-08-21 21:28:51,427 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-21 21:28:51,439 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 21:28:51,449 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 21:28:51,469 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 21:28:51,505 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 21:28:51,505 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 21:28:51,506 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 21:28:51,506 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 21:28:51,506 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 21:28:51,506 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 21:28:51,507 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 21:28:51,507 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 21:28:51,529 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 21:28:51,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 21:28:51,544 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:51,545 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:51,560 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:51,571 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:51,571 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-21 21:28:51,584 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:51,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [83273306] [2020-08-21 21:28:51,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:51,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:51,798 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:51,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:51,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:51,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:51,842 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 21:28:51,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [83273306] [2020-08-21 21:28:51,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:28:51,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 21:28:51,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [950237946] [2020-08-21 21:28:51,855 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 21:28:51,856 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:51,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 21:28:51,870 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 21:28:51,872 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-21 21:28:52,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:52,031 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-21 21:28:52,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 21:28:52,034 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 21:28:52,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:52,052 INFO L225 Difference]: With dead ends: 59 [2020-08-21 21:28:52,052 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 21:28:52,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 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 21:28:52,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 21:28:52,090 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 21:28:52,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 21:28:52,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 21:28:52,095 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-21 21:28:52,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:52,096 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 21:28:52,096 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 21:28:52,096 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 21:28:52,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 21:28:52,097 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:52,097 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:52,098 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 21:28:52,098 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:52,098 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:52,099 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-21 21:28:52,099 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:52,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1764915437] [2020-08-21 21:28:52,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:52,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:52,176 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:52,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:52,197 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:52,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:52,302 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 21:28:52,308 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1764915437] [2020-08-21 21:28:52,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:28:52,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 21:28:52,309 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474064369] [2020-08-21 21:28:52,310 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:28:52,311 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:52,311 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:28:52,311 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:28:52,311 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 21:28:52,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:52,518 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-21 21:28:52,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 21:28:52,519 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-21 21:28:52,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:52,520 INFO L225 Difference]: With dead ends: 48 [2020-08-21 21:28:52,520 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 21:28:52,522 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:28:52,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 21:28:52,529 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 21:28:52,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 21:28:52,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-21 21:28:52,531 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-21 21:28:52,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:52,531 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-21 21:28:52,531 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:28:52,532 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-21 21:28:52,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 21:28:52,533 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:52,533 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:52,533 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 21:28:52,534 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:52,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:52,547 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-21 21:28:52,547 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:52,547 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1242450333] [2020-08-21 21:28:52,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:52,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:52,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:52,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:52,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:52,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:52,709 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:52,709 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1242450333] [2020-08-21 21:28:52,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:52,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 21:28:52,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2136442627] [2020-08-21 21:28:52,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 21:28:52,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:52,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 21:28:52,712 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:28:52,712 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-21 21:28:52,891 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:52,892 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-21 21:28:52,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 21:28:52,892 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 21:28:52,893 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:52,893 INFO L225 Difference]: With dead ends: 50 [2020-08-21 21:28:52,894 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 21:28:52,894 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:28:52,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 21:28:52,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 21:28:52,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 21:28:52,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-21 21:28:52,902 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-21 21:28:52,902 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:52,902 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-21 21:28:52,902 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 21:28:52,903 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-21 21:28:52,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 21:28:52,904 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:52,904 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:52,904 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 21:28:52,904 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:52,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:52,905 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-21 21:28:52,905 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:52,905 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [930127511] [2020-08-21 21:28:52,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:52,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:52,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:52,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:52,968 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:52,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:53,112 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:53,113 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [930127511] [2020-08-21 21:28:53,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:53,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 21:28:53,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [854138797] [2020-08-21 21:28:53,116 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 21:28:53,116 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:53,117 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 21:28:53,118 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 21:28:53,118 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-21 21:28:53,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:53,287 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-21 21:28:53,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 21:28:53,288 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-21 21:28:53,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:53,289 INFO L225 Difference]: With dead ends: 52 [2020-08-21 21:28:53,289 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 21:28:53,290 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:28:53,291 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 21:28:53,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 21:28:53,297 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 21:28:53,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-21 21:28:53,298 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-21 21:28:53,298 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:53,298 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-21 21:28:53,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 21:28:53,299 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-21 21:28:53,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 21:28:53,300 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:53,300 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:53,300 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 21:28:53,300 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:53,301 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:53,301 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-21 21:28:53,301 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:53,302 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [143368413] [2020-08-21 21:28:53,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:53,319 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:53,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:53,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:53,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:53,375 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:53,571 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:53,572 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [143368413] [2020-08-21 21:28:53,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:53,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 21:28:53,573 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1287286305] [2020-08-21 21:28:53,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 21:28:53,575 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:53,575 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 21:28:53,576 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 21:28:53,576 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-21 21:28:53,768 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:53,769 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-21 21:28:53,769 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 21:28:53,769 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-21 21:28:53,770 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:53,770 INFO L225 Difference]: With dead ends: 54 [2020-08-21 21:28:53,771 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 21:28:53,771 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:28:53,772 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 21:28:53,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 21:28:53,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 21:28:53,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-21 21:28:53,777 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-21 21:28:53,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:53,778 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-21 21:28:53,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 21:28:53,778 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-21 21:28:53,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 21:28:53,779 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:53,779 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:53,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 21:28:53,780 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:53,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:53,780 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-21 21:28:53,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:53,781 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2065384166] [2020-08-21 21:28:53,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:53,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:53,815 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:53,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:53,826 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:53,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,014 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:54,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2065384166] [2020-08-21 21:28:54,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:54,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 21:28:54,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1080926697] [2020-08-21 21:28:54,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 21:28:54,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:54,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 21:28:54,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-21 21:28:54,017 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-21 21:28:54,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:54,176 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-21 21:28:54,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 21:28:54,177 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-21 21:28:54,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:54,178 INFO L225 Difference]: With dead ends: 56 [2020-08-21 21:28:54,178 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 21:28:54,179 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:28:54,179 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 21:28:54,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 21:28:54,183 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 21:28:54,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-21 21:28:54,184 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-21 21:28:54,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:54,185 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-21 21:28:54,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 21:28:54,185 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-21 21:28:54,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 21:28:54,186 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:54,186 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:54,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 21:28:54,187 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:54,187 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:54,187 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-21 21:28:54,187 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:54,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1331360937] [2020-08-21 21:28:54,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:54,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:54,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,238 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:54,249 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,473 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:54,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1331360937] [2020-08-21 21:28:54,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:54,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 21:28:54,474 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [342658819] [2020-08-21 21:28:54,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 21:28:54,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:54,475 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 21:28:54,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 21:28:54,475 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-21 21:28:54,657 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:54,657 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-21 21:28:54,657 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 21:28:54,658 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 21:28:54,658 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:54,660 INFO L225 Difference]: With dead ends: 58 [2020-08-21 21:28:54,660 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 21:28:54,661 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:28:54,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 21:28:54,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 21:28:54,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 21:28:54,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 21:28:54,670 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-21 21:28:54,671 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:54,671 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 21:28:54,671 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 21:28:54,671 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 21:28:54,672 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 21:28:54,672 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:54,672 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:54,672 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 21:28:54,673 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:54,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:54,673 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-21 21:28:54,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:54,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [56035048] [2020-08-21 21:28:54,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:54,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:54,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:54,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:54,990 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:54,990 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [56035048] [2020-08-21 21:28:54,990 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:54,991 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 21:28:54,991 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1097911520] [2020-08-21 21:28:54,991 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 21:28:54,992 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:54,992 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 21:28:54,992 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-21 21:28:54,992 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-21 21:28:55,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:55,209 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-21 21:28:55,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 21:28:55,210 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-21 21:28:55,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:55,211 INFO L225 Difference]: With dead ends: 60 [2020-08-21 21:28:55,211 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 21:28:55,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:28:55,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 21:28:55,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 21:28:55,223 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 21:28:55,224 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 21:28:55,224 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-21 21:28:55,224 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:55,224 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 21:28:55,224 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 21:28:55,225 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 21:28:55,225 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 21:28:55,225 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:55,226 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:55,226 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 21:28:55,226 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:55,226 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:55,226 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-21 21:28:55,230 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:55,230 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1228125878] [2020-08-21 21:28:55,230 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:55,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:55,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:55,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:55,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:55,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:55,600 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:55,601 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1228125878] [2020-08-21 21:28:55,601 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:55,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 21:28:55,604 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [782456177] [2020-08-21 21:28:55,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 21:28:55,605 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:55,608 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 21:28:55,608 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-21 21:28:55,608 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-21 21:28:55,821 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:55,822 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 21:28:55,822 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 21:28:55,822 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-21 21:28:55,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:55,823 INFO L225 Difference]: With dead ends: 62 [2020-08-21 21:28:55,823 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 21:28:55,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:28:55,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 21:28:55,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 21:28:55,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 21:28:55,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-21 21:28:55,833 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-21 21:28:55,835 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:55,836 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-21 21:28:55,836 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 21:28:55,836 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-21 21:28:55,837 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 21:28:55,837 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:55,837 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:55,837 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 21:28:55,837 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:55,838 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:55,841 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-21 21:28:55,841 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:55,841 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [104689359] [2020-08-21 21:28:55,841 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:55,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:55,887 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:55,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:55,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:55,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,242 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 21:28:56,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [104689359] [2020-08-21 21:28:56,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:56,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 21:28:56,243 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415258551] [2020-08-21 21:28:56,244 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 21:28:56,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:56,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 21:28:56,245 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-21 21:28:56,245 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-21 21:28:56,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:56,496 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-21 21:28:56,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 21:28:56,496 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 21:28:56,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:56,497 INFO L225 Difference]: With dead ends: 64 [2020-08-21 21:28:56,497 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 21:28:56,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:28:56,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 21:28:56,503 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 21:28:56,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 21:28:56,504 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-21 21:28:56,504 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-21 21:28:56,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:56,504 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-21 21:28:56,504 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 21:28:56,505 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-21 21:28:56,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 21:28:56,505 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:56,505 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:56,506 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 21:28:56,506 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:56,506 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:56,506 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-21 21:28:56,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:56,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1903110881] [2020-08-21 21:28:56,507 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:56,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,538 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:56,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,567 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:56,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,581 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 21:28:56,581 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1903110881] [2020-08-21 21:28:56,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:28:56,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 21:28:56,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [313625864] [2020-08-21 21:28:56,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:28:56,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:56,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:28:56,583 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:28:56,583 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-21 21:28:56,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:56,665 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-21 21:28:56,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 21:28:56,666 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-21 21:28:56,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:56,668 INFO L225 Difference]: With dead ends: 65 [2020-08-21 21:28:56,668 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 21:28:56,668 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:28:56,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 21:28:56,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-21 21:28:56,679 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 21:28:56,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-21 21:28:56,679 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-21 21:28:56,680 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:56,680 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-21 21:28:56,680 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:28:56,680 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-21 21:28:56,681 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 21:28:56,681 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:56,681 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:56,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 21:28:56,682 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:56,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:56,682 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-21 21:28:56,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:56,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1840867955] [2020-08-21 21:28:56,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:56,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,720 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:56,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,732 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:56,734 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,745 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 21:28:56,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1840867955] [2020-08-21 21:28:56,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:56,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 21:28:56,746 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149174098] [2020-08-21 21:28:56,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 21:28:56,747 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:56,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 21:28:56,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:28:56,747 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-21 21:28:56,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:56,905 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-21 21:28:56,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 21:28:56,905 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-21 21:28:56,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:56,906 INFO L225 Difference]: With dead ends: 73 [2020-08-21 21:28:56,906 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 21:28:56,907 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-21 21:28:56,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 21:28:56,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-21 21:28:56,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 21:28:56,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 21:28:56,914 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-21 21:28:56,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:56,915 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 21:28:56,915 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 21:28:56,915 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 21:28:56,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 21:28:56,916 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:56,916 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:56,916 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 21:28:56,916 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:56,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:56,917 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-21 21:28:56,917 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:56,917 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1741945612] [2020-08-21 21:28:56,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:56,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:56,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,980 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:56,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:56,992 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-21 21:28:56,993 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1741945612] [2020-08-21 21:28:56,993 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 21:28:56,993 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 21:28:56,993 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1985444507] [2020-08-21 21:28:56,994 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 21:28:56,994 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:56,994 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 21:28:56,994 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 21:28:56,994 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 21:28:57,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:57,084 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-21 21:28:57,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 21:28:57,085 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-21 21:28:57,085 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:57,086 INFO L225 Difference]: With dead ends: 69 [2020-08-21 21:28:57,086 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 21:28:57,087 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 21:28:57,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 21:28:57,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 21:28:57,091 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 21:28:57,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-21 21:28:57,092 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-21 21:28:57,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:57,093 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-21 21:28:57,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 21:28:57,093 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-21 21:28:57,094 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 21:28:57,094 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:57,094 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:57,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 21:28:57,095 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:57,095 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:57,095 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-21 21:28:57,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:57,096 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [742381442] [2020-08-21 21:28:57,096 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:57,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:57,131 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:57,132 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:57,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:57,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:57,518 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:28:57,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [742381442] [2020-08-21 21:28:57,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:57,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 21:28:57,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235529507] [2020-08-21 21:28:57,520 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 21:28:57,520 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:57,520 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 21:28:57,521 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-21 21:28:57,521 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-21 21:28:57,755 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:57,755 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-21 21:28:57,756 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 21:28:57,756 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-21 21:28:57,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:57,757 INFO L225 Difference]: With dead ends: 74 [2020-08-21 21:28:57,757 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 21:28:57,758 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:28:57,758 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 21:28:57,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 21:28:57,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 21:28:57,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-21 21:28:57,763 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-21 21:28:57,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:57,763 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-21 21:28:57,763 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 21:28:57,763 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-21 21:28:57,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 21:28:57,764 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:57,764 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:57,764 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 21:28:57,765 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:57,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:57,765 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-21 21:28:57,765 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:57,766 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1783469182] [2020-08-21 21:28:57,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:57,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:57,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:57,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:57,813 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:57,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,284 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:28:58,285 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1783469182] [2020-08-21 21:28:58,285 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:58,285 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 21:28:58,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [467482447] [2020-08-21 21:28:58,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 21:28:58,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:58,286 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 21:28:58,286 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-21 21:28:58,287 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-21 21:28:58,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:58,549 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-21 21:28:58,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 21:28:58,549 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-21 21:28:58,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:58,550 INFO L225 Difference]: With dead ends: 76 [2020-08-21 21:28:58,550 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 21:28:58,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:28:58,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 21:28:58,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 21:28:58,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 21:28:58,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-21 21:28:58,560 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-21 21:28:58,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:58,560 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-21 21:28:58,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 21:28:58,560 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-21 21:28:58,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 21:28:58,561 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:58,561 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:58,561 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 21:28:58,562 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:58,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:58,562 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-21 21:28:58,562 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:58,562 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [558166993] [2020-08-21 21:28:58,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:58,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,596 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:58,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:58,607 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:58,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:59,057 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:28:59,057 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [558166993] [2020-08-21 21:28:59,060 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:59,060 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 21:28:59,061 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682047650] [2020-08-21 21:28:59,061 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 21:28:59,061 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:59,062 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 21:28:59,062 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-21 21:28:59,062 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-21 21:28:59,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:28:59,280 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-21 21:28:59,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 21:28:59,281 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 21:28:59,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:28:59,282 INFO L225 Difference]: With dead ends: 78 [2020-08-21 21:28:59,282 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 21:28:59,283 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:28:59,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 21:28:59,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 21:28:59,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 21:28:59,292 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-21 21:28:59,292 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-21 21:28:59,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:28:59,293 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-21 21:28:59,293 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 21:28:59,293 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-21 21:28:59,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 21:28:59,299 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:28:59,299 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:28:59,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 21:28:59,299 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:28:59,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:28:59,300 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-21 21:28:59,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:28:59,300 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [31321013] [2020-08-21 21:28:59,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:28:59,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:59,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:28:59,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:59,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:28:59,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:28:59,894 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:28:59,895 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [31321013] [2020-08-21 21:28:59,895 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:28:59,895 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 21:28:59,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1240379178] [2020-08-21 21:28:59,896 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 21:28:59,896 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:28:59,896 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 21:28:59,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-21 21:28:59,897 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-21 21:29:00,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:00,150 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-21 21:29:00,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 21:29:00,150 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-21 21:29:00,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:00,151 INFO L225 Difference]: With dead ends: 80 [2020-08-21 21:29:00,151 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 21:29:00,152 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:29:00,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 21:29:00,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 21:29:00,159 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 21:29:00,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-21 21:29:00,160 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-21 21:29:00,160 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:00,160 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-21 21:29:00,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 21:29:00,161 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-21 21:29:00,161 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 21:29:00,161 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:00,161 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:00,162 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 21:29:00,162 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:00,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:00,162 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-21 21:29:00,162 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:00,163 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1777218695] [2020-08-21 21:29:00,163 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:00,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:00,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:00,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:00,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:00,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:00,787 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:00,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1777218695] [2020-08-21 21:29:00,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:00,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 21:29:00,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1757106046] [2020-08-21 21:29:00,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 21:29:00,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:00,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 21:29:00,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-21 21:29:00,790 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-21 21:29:01,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:01,062 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-21 21:29:01,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 21:29:01,063 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-21 21:29:01,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:01,064 INFO L225 Difference]: With dead ends: 82 [2020-08-21 21:29:01,064 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 21:29:01,065 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:29:01,065 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 21:29:01,068 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 21:29:01,068 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 21:29:01,069 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-21 21:29:01,069 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-21 21:29:01,069 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:01,069 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-21 21:29:01,070 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 21:29:01,070 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-21 21:29:01,070 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 21:29:01,070 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:01,070 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:01,071 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 21:29:01,071 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:01,071 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:01,071 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-21 21:29:01,071 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:01,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1368454630] [2020-08-21 21:29:01,072 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:01,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:01,109 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:01,110 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:01,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:01,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:01,802 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:01,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1368454630] [2020-08-21 21:29:01,803 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:01,803 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 21:29:01,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205899093] [2020-08-21 21:29:01,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 21:29:01,806 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:01,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 21:29:01,807 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-21 21:29:01,807 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-21 21:29:02,188 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:02,188 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-21 21:29:02,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 21:29:02,189 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-21 21:29:02,189 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:02,190 INFO L225 Difference]: With dead ends: 84 [2020-08-21 21:29:02,192 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 21:29:02,193 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:29:02,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 21:29:02,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 21:29:02,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 21:29:02,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-21 21:29:02,196 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-21 21:29:02,196 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:02,196 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-21 21:29:02,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 21:29:02,197 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-21 21:29:02,197 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 21:29:02,197 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:02,197 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:02,198 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 21:29:02,198 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:02,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:02,198 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-21 21:29:02,198 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:02,199 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1524047314] [2020-08-21 21:29:02,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:02,235 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:02,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:02,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:02,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:02,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:02,965 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:02,966 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1524047314] [2020-08-21 21:29:02,966 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:02,966 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 21:29:02,966 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [823358963] [2020-08-21 21:29:02,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 21:29:02,967 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:02,967 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 21:29:02,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-21 21:29:02,967 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-21 21:29:03,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:03,191 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-21 21:29:03,192 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 21:29:03,192 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-21 21:29:03,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:03,193 INFO L225 Difference]: With dead ends: 86 [2020-08-21 21:29:03,193 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 21:29:03,197 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:29:03,198 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 21:29:03,201 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 21:29:03,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 21:29:03,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-21 21:29:03,203 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-21 21:29:03,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:03,203 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-21 21:29:03,203 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 21:29:03,203 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-21 21:29:03,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 21:29:03,204 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:03,204 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:03,204 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 21:29:03,204 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:03,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:03,205 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-21 21:29:03,205 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:03,205 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1324564771] [2020-08-21 21:29:03,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:03,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:03,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:03,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:03,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:03,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:04,020 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:04,021 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1324564771] [2020-08-21 21:29:04,021 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:04,021 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 21:29:04,021 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1147910137] [2020-08-21 21:29:04,022 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 21:29:04,022 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:04,022 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 21:29:04,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-21 21:29:04,023 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-21 21:29:04,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:04,310 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-21 21:29:04,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 21:29:04,311 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-21 21:29:04,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:04,312 INFO L225 Difference]: With dead ends: 88 [2020-08-21 21:29:04,312 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 21:29:04,313 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:29:04,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 21:29:04,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 21:29:04,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 21:29:04,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-21 21:29:04,319 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-21 21:29:04,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:04,319 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-21 21:29:04,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 21:29:04,319 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-21 21:29:04,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 21:29:04,320 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:04,320 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:04,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 21:29:04,321 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:04,321 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:04,321 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-21 21:29:04,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:04,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [197712631] [2020-08-21 21:29:04,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:04,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:04,363 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:04,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:04,373 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:04,385 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:05,343 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:05,344 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [197712631] [2020-08-21 21:29:05,344 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:05,344 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 21:29:05,345 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [880487573] [2020-08-21 21:29:05,345 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 21:29:05,345 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:05,346 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 21:29:05,346 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-21 21:29:05,346 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-21 21:29:05,654 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:05,654 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-21 21:29:05,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 21:29:05,656 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-21 21:29:05,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:05,657 INFO L225 Difference]: With dead ends: 90 [2020-08-21 21:29:05,657 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 21:29:05,658 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-21 21:29:05,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 21:29:05,663 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 21:29:05,663 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 21:29:05,663 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-21 21:29:05,664 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-21 21:29:05,664 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:05,664 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-21 21:29:05,664 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 21:29:05,664 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-21 21:29:05,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 21:29:05,665 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:05,665 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:05,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 21:29:05,665 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:05,666 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:05,666 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-21 21:29:05,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:05,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1322098206] [2020-08-21 21:29:05,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:05,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:05,709 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:05,710 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:05,718 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:05,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:06,576 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:06,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1322098206] [2020-08-21 21:29:06,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:06,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 21:29:06,577 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [874880174] [2020-08-21 21:29:06,578 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 21:29:06,578 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:06,578 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 21:29:06,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-21 21:29:06,579 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-21 21:29:06,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:06,888 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-21 21:29:06,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 21:29:06,888 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-21 21:29:06,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:06,889 INFO L225 Difference]: With dead ends: 92 [2020-08-21 21:29:06,889 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 21:29:06,891 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:29:06,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 21:29:06,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 21:29:06,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 21:29:06,896 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-21 21:29:06,896 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-21 21:29:06,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:06,897 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-21 21:29:06,897 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 21:29:06,897 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-21 21:29:06,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 21:29:06,898 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:06,898 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:06,898 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 21:29:06,898 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:06,899 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:06,899 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-21 21:29:06,899 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:06,899 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493612110] [2020-08-21 21:29:06,899 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:06,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:06,946 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:06,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:06,957 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:06,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:08,143 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:08,144 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [493612110] [2020-08-21 21:29:08,144 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:08,144 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 21:29:08,144 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053740457] [2020-08-21 21:29:08,145 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 21:29:08,145 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:08,145 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 21:29:08,146 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-21 21:29:08,146 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-21 21:29:08,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:08,590 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-21 21:29:08,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 21:29:08,590 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-21 21:29:08,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:08,591 INFO L225 Difference]: With dead ends: 94 [2020-08-21 21:29:08,591 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 21:29:08,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:29:08,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 21:29:08,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 21:29:08,600 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 21:29:08,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-21 21:29:08,601 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-21 21:29:08,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:08,601 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-21 21:29:08,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 21:29:08,601 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-21 21:29:08,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 21:29:08,602 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:08,602 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:08,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 21:29:08,605 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:08,605 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:08,606 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-21 21:29:08,606 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:08,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1650517926] [2020-08-21 21:29:08,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:08,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:08,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:08,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:08,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:08,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:09,622 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:09,622 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1650517926] [2020-08-21 21:29:09,622 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:09,623 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 21:29:09,623 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188657342] [2020-08-21 21:29:09,623 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 21:29:09,623 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:09,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 21:29:09,624 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-21 21:29:09,624 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-21 21:29:10,020 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:10,021 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-21 21:29:10,021 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 21:29:10,021 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-21 21:29:10,021 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:10,022 INFO L225 Difference]: With dead ends: 96 [2020-08-21 21:29:10,022 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 21:29:10,023 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:29:10,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 21:29:10,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 21:29:10,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 21:29:10,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-21 21:29:10,028 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-21 21:29:10,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:10,029 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-21 21:29:10,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 21:29:10,029 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-21 21:29:10,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 21:29:10,030 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:10,030 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:10,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 21:29:10,030 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:10,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:10,030 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-21 21:29:10,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:10,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1217060087] [2020-08-21 21:29:10,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:10,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:10,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:10,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:10,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:10,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:11,078 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:11,078 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1217060087] [2020-08-21 21:29:11,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:11,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 21:29:11,079 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280768612] [2020-08-21 21:29:11,079 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 21:29:11,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:11,080 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 21:29:11,080 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-21 21:29:11,080 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-21 21:29:11,319 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:11,320 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-21 21:29:11,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 21:29:11,320 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-21 21:29:11,320 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:11,321 INFO L225 Difference]: With dead ends: 98 [2020-08-21 21:29:11,321 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 21:29:11,322 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:29:11,322 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 21:29:11,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 21:29:11,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 21:29:11,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-21 21:29:11,326 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-21 21:29:11,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:11,327 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-21 21:29:11,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 21:29:11,327 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-21 21:29:11,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 21:29:11,328 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:11,328 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:11,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 21:29:11,328 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:11,328 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:11,329 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-21 21:29:11,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:11,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1414158932] [2020-08-21 21:29:11,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:11,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:11,379 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:11,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:11,390 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:11,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:12,524 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:12,524 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1414158932] [2020-08-21 21:29:12,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:12,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 21:29:12,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203601077] [2020-08-21 21:29:12,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 21:29:12,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:12,525 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 21:29:12,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-21 21:29:12,526 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-21 21:29:12,873 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:12,873 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-21 21:29:12,874 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 21:29:12,874 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-21 21:29:12,874 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:12,875 INFO L225 Difference]: With dead ends: 100 [2020-08-21 21:29:12,875 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 21:29:12,876 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:29:12,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 21:29:12,881 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 21:29:12,881 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 21:29:12,882 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-21 21:29:12,882 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-21 21:29:12,882 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:12,882 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-21 21:29:12,882 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 21:29:12,883 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-21 21:29:12,883 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 21:29:12,883 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:12,883 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:12,884 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 21:29:12,884 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:12,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:12,884 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-21 21:29:12,884 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:12,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [122989667] [2020-08-21 21:29:12,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:12,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:12,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:12,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:12,945 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:12,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:14,155 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:14,156 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [122989667] [2020-08-21 21:29:14,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:14,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 21:29:14,157 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1723257408] [2020-08-21 21:29:14,158 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 21:29:14,158 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:14,159 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 21:29:14,160 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-21 21:29:14,160 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-21 21:29:14,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:14,553 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-21 21:29:14,553 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 21:29:14,553 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-21 21:29:14,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:14,554 INFO L225 Difference]: With dead ends: 102 [2020-08-21 21:29:14,554 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 21:29:14,555 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-21 21:29:14,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 21:29:14,559 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 21:29:14,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 21:29:14,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-21 21:29:14,561 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-21 21:29:14,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:14,561 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-21 21:29:14,561 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 21:29:14,561 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-21 21:29:14,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 21:29:14,562 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:14,562 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:14,563 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 21:29:14,563 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:14,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:14,563 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-21 21:29:14,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:14,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [709253154] [2020-08-21 21:29:14,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:14,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:14,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:14,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:14,649 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:14,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:15,878 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:15,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [709253154] [2020-08-21 21:29:15,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:15,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 21:29:15,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058870716] [2020-08-21 21:29:15,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 21:29:15,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:15,879 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 21:29:15,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-21 21:29:15,880 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-21 21:29:16,177 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:16,177 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-21 21:29:16,177 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 21:29:16,178 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-21 21:29:16,178 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:16,179 INFO L225 Difference]: With dead ends: 104 [2020-08-21 21:29:16,179 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 21:29:16,180 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:29:16,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 21:29:16,184 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 21:29:16,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 21:29:16,185 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-21 21:29:16,185 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-21 21:29:16,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:16,186 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-21 21:29:16,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 21:29:16,186 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-21 21:29:16,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 21:29:16,187 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:16,187 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:16,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 21:29:16,187 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:16,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:16,188 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-21 21:29:16,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:16,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [406445083] [2020-08-21 21:29:16,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:16,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:16,242 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:16,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:16,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:16,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:17,571 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:17,571 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [406445083] [2020-08-21 21:29:17,571 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:17,571 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 21:29:17,572 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [440631147] [2020-08-21 21:29:17,572 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 21:29:17,572 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:17,572 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 21:29:17,573 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-21 21:29:17,573 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-21 21:29:17,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:17,988 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-21 21:29:17,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 21:29:17,988 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-21 21:29:17,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:17,990 INFO L225 Difference]: With dead ends: 106 [2020-08-21 21:29:17,990 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 21:29:17,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:29:17,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 21:29:17,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 21:29:18,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 21:29:18,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-21 21:29:18,000 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-21 21:29:18,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:18,001 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-21 21:29:18,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 21:29:18,001 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-21 21:29:18,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 21:29:18,002 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:18,002 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:18,002 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 21:29:18,002 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:18,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:18,002 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-21 21:29:18,003 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:18,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [340900110] [2020-08-21 21:29:18,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:18,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:18,056 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:18,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:18,067 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:18,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:19,503 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:19,504 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [340900110] [2020-08-21 21:29:19,504 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:19,504 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 21:29:19,504 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970586846] [2020-08-21 21:29:19,505 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 21:29:19,505 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:19,505 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 21:29:19,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-21 21:29:19,505 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-21 21:29:19,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:19,936 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-21 21:29:19,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 21:29:19,936 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-21 21:29:19,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:19,938 INFO L225 Difference]: With dead ends: 108 [2020-08-21 21:29:19,938 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 21:29:19,939 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:29:19,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 21:29:19,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 21:29:19,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 21:29:19,943 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-21 21:29:19,943 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-21 21:29:19,944 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:19,944 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-21 21:29:19,944 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 21:29:19,944 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-21 21:29:19,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 21:29:19,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:19,944 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:19,945 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 21:29:19,945 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:19,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:19,945 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-21 21:29:19,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:19,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [453266378] [2020-08-21 21:29:19,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:19,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:20,001 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:20,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:20,011 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:20,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:21,490 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:21,490 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [453266378] [2020-08-21 21:29:21,490 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:21,491 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 21:29:21,491 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [927796811] [2020-08-21 21:29:21,491 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 21:29:21,491 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:21,492 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 21:29:21,492 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 21:29:21,492 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-21 21:29:21,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:21,934 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-21 21:29:21,934 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 21:29:21,935 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-21 21:29:21,935 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:21,936 INFO L225 Difference]: With dead ends: 110 [2020-08-21 21:29:21,936 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 21:29:21,937 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:29:21,938 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 21:29:21,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 21:29:21,942 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 21:29:21,942 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-21 21:29:21,943 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-21 21:29:21,943 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:21,943 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-21 21:29:21,943 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 21:29:21,943 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-21 21:29:21,944 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 21:29:21,944 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:21,944 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:21,944 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 21:29:21,944 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:21,945 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:21,945 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-21 21:29:21,945 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:21,945 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [353231559] [2020-08-21 21:29:21,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:21,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:22,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:22,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:22,017 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:22,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:23,568 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:23,568 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [353231559] [2020-08-21 21:29:23,568 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:23,568 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 21:29:23,569 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1534276283] [2020-08-21 21:29:23,569 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 21:29:23,569 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:23,569 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 21:29:23,570 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 21:29:23,570 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-21 21:29:24,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:24,060 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-21 21:29:24,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 21:29:24,060 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-21 21:29:24,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:24,062 INFO L225 Difference]: With dead ends: 112 [2020-08-21 21:29:24,062 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 21:29:24,063 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:29:24,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 21:29:24,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 21:29:24,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 21:29:24,068 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-21 21:29:24,068 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-21 21:29:24,068 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:24,068 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-21 21:29:24,069 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 21:29:24,069 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-21 21:29:24,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 21:29:24,069 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:24,069 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:24,070 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 21:29:24,070 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:24,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:24,070 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-21 21:29:24,070 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:24,071 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2115962276] [2020-08-21 21:29:24,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:24,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:24,127 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:24,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:24,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:24,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:25,782 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:25,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2115962276] [2020-08-21 21:29:25,782 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:25,782 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 21:29:25,782 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930913155] [2020-08-21 21:29:25,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 21:29:25,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:25,783 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 21:29:25,783 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 21:29:25,783 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-21 21:29:26,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:26,275 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-21 21:29:26,275 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 21:29:26,276 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-21 21:29:26,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:26,277 INFO L225 Difference]: With dead ends: 114 [2020-08-21 21:29:26,277 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 21:29:26,277 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:29:26,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 21:29:26,283 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 21:29:26,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 21:29:26,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-21 21:29:26,285 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-21 21:29:26,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:26,287 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-21 21:29:26,287 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 21:29:26,287 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-21 21:29:26,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 21:29:26,288 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:26,288 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:26,289 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 21:29:26,289 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:26,289 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:26,289 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-21 21:29:26,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:26,293 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [814859425] [2020-08-21 21:29:26,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:26,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:26,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:26,369 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:26,380 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:26,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:28,162 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:28,162 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [814859425] [2020-08-21 21:29:28,162 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:28,163 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 21:29:28,163 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094629758] [2020-08-21 21:29:28,163 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 21:29:28,163 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:28,164 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 21:29:28,164 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 21:29:28,164 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-21 21:29:28,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:28,539 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-21 21:29:28,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 21:29:28,540 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-21 21:29:28,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:28,541 INFO L225 Difference]: With dead ends: 116 [2020-08-21 21:29:28,541 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 21:29:28,542 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:29:28,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 21:29:28,546 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 21:29:28,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 21:29:28,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-21 21:29:28,549 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-21 21:29:28,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:28,549 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-21 21:29:28,549 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 21:29:28,550 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-21 21:29:28,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 21:29:28,550 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:28,550 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:28,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 21:29:28,550 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:28,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:28,551 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-21 21:29:28,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:28,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [197251775] [2020-08-21 21:29:28,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:28,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:28,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:28,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:28,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:28,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:30,460 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:30,460 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [197251775] [2020-08-21 21:29:30,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:30,461 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 21:29:30,461 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1585529678] [2020-08-21 21:29:30,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 21:29:30,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:30,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 21:29:30,462 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 21:29:30,462 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-21 21:29:30,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:30,965 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-21 21:29:30,966 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 21:29:30,966 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-21 21:29:30,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:30,967 INFO L225 Difference]: With dead ends: 118 [2020-08-21 21:29:30,968 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 21:29:30,969 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:29:30,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 21:29:30,973 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 21:29:30,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 21:29:30,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-21 21:29:30,974 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-21 21:29:30,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:30,975 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-21 21:29:30,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 21:29:30,975 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-21 21:29:30,977 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 21:29:30,977 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:30,977 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:30,977 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 21:29:30,978 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:30,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:30,978 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-21 21:29:30,978 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:30,978 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1949656717] [2020-08-21 21:29:30,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:31,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:31,040 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:31,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:31,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:31,079 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:32,958 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:32,958 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1949656717] [2020-08-21 21:29:32,958 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:32,958 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 21:29:32,958 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446969677] [2020-08-21 21:29:32,959 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 21:29:32,959 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:32,959 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 21:29:32,960 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 21:29:32,960 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-21 21:29:33,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:33,414 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-21 21:29:33,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 21:29:33,414 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-21 21:29:33,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:33,415 INFO L225 Difference]: With dead ends: 120 [2020-08-21 21:29:33,416 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 21:29:33,416 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:29:33,417 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 21:29:33,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 21:29:33,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 21:29:33,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-21 21:29:33,421 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-21 21:29:33,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:33,422 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-21 21:29:33,422 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 21:29:33,422 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-21 21:29:33,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 21:29:33,423 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:33,423 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:33,423 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 21:29:33,423 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:33,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:33,423 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-21 21:29:33,424 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:33,424 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [616450883] [2020-08-21 21:29:33,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:33,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:33,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:33,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:33,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:33,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:35,529 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:35,530 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [616450883] [2020-08-21 21:29:35,530 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:35,530 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 21:29:35,530 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1050520644] [2020-08-21 21:29:35,531 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 21:29:35,531 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:35,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 21:29:35,532 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 21:29:35,532 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-21 21:29:35,883 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:35,883 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-21 21:29:35,884 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 21:29:35,884 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-21 21:29:35,885 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:35,885 INFO L225 Difference]: With dead ends: 122 [2020-08-21 21:29:35,885 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 21:29:35,887 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 21:29:35,887 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 21:29:35,890 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 21:29:35,890 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 21:29:35,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-21 21:29:35,891 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-21 21:29:35,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:35,891 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-21 21:29:35,891 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 21:29:35,891 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-21 21:29:35,892 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 21:29:35,892 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:35,892 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:35,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 21:29:35,893 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:35,893 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:35,893 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-21 21:29:35,893 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:35,893 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [821283554] [2020-08-21 21:29:35,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:35,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:35,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:35,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:35,973 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:35,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:38,119 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:38,120 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [821283554] [2020-08-21 21:29:38,120 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:38,120 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 21:29:38,120 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [222804936] [2020-08-21 21:29:38,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 21:29:38,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:38,121 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 21:29:38,121 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 21:29:38,121 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-21 21:29:38,452 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:38,452 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-21 21:29:38,452 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 21:29:38,453 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-21 21:29:38,453 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:38,454 INFO L225 Difference]: With dead ends: 124 [2020-08-21 21:29:38,454 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 21:29:38,455 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 21:29:38,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 21:29:38,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 21:29:38,459 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 21:29:38,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-21 21:29:38,460 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-21 21:29:38,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:38,460 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-21 21:29:38,460 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 21:29:38,460 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-21 21:29:38,461 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 21:29:38,461 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:38,461 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:38,461 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 21:29:38,461 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:38,462 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:38,462 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-21 21:29:38,462 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:38,462 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [112110112] [2020-08-21 21:29:38,462 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:38,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:38,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:38,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:38,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:38,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:40,860 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:40,861 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [112110112] [2020-08-21 21:29:40,861 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:40,861 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 21:29:40,861 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1152949225] [2020-08-21 21:29:40,861 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 21:29:40,861 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:40,862 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 21:29:40,862 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 21:29:40,862 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-21 21:29:41,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:41,218 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-21 21:29:41,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 21:29:41,218 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-21 21:29:41,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:41,220 INFO L225 Difference]: With dead ends: 126 [2020-08-21 21:29:41,220 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 21:29:41,221 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 21:29:41,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 21:29:41,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 21:29:41,226 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 21:29:41,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-21 21:29:41,226 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-21 21:29:41,227 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:41,227 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-21 21:29:41,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 21:29:41,227 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-21 21:29:41,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 21:29:41,227 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:41,228 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:41,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 21:29:41,228 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:41,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:41,228 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-21 21:29:41,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:41,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1699801491] [2020-08-21 21:29:41,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:41,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:41,289 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:41,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:41,304 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:41,322 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:43,639 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:43,640 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1699801491] [2020-08-21 21:29:43,640 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:43,640 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 21:29:43,640 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420228085] [2020-08-21 21:29:43,640 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 21:29:43,640 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:43,641 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 21:29:43,641 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 21:29:43,641 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-21 21:29:44,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:44,088 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-21 21:29:44,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 21:29:44,089 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-21 21:29:44,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:44,091 INFO L225 Difference]: With dead ends: 128 [2020-08-21 21:29:44,091 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 21:29:44,092 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 21:29:44,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 21:29:44,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 21:29:44,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 21:29:44,098 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-21 21:29:44,099 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-21 21:29:44,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:44,099 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-21 21:29:44,099 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 21:29:44,099 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-21 21:29:44,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 21:29:44,100 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:44,100 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:44,100 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 21:29:44,100 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:44,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:44,101 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-21 21:29:44,101 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:44,101 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [942387275] [2020-08-21 21:29:44,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:44,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:44,170 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:44,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:44,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:44,209 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:46,588 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 21:29:46,589 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [942387275] [2020-08-21 21:29:46,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 21:29:46,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 21:29:46,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [263263315] [2020-08-21 21:29:46,589 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 21:29:46,589 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 21:29:46,590 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 21:29:46,591 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 21:29:46,591 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-21 21:29:47,196 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 21:29:47,196 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-21 21:29:47,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 21:29:47,197 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-21 21:29:47,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 21:29:47,198 INFO L225 Difference]: With dead ends: 130 [2020-08-21 21:29:47,198 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 21:29:47,199 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 21:29:47,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 21:29:47,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 21:29:47,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 21:29:47,204 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-21 21:29:47,204 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-21 21:29:47,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 21:29:47,204 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-21 21:29:47,204 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 21:29:47,205 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-21 21:29:47,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 21:29:47,205 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 21:29:47,205 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 21:29:47,206 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 21:29:47,206 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 21:29:47,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 21:29:47,206 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-21 21:29:47,206 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 21:29:47,207 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1859429682] [2020-08-21 21:29:47,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 21:29:47,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:47,267 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 21:29:47,268 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 21:29:47,288 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 21:29:47,308 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat