/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=BIGGEST --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 17:26:59,910 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 17:26:59,913 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 17:26:59,957 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 17:26:59,958 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:26:59,970 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:26:59,971 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:26:59,975 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:26:59,978 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:26:59,981 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:26:59,982 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:26:59,985 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:26:59,985 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:26:59,988 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:26:59,991 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:26:59,992 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:26:59,994 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:26:59,995 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:26:59,997 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:27:00,006 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:27:00,009 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:27:00,010 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:27:00,011 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:27:00,012 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:27:00,015 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 17:27:00,026 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:27:00,027 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:27:00,028 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:27:00,029 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 17:27:00,071 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:27:00,071 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:27:00,074 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:27:00,074 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:27:00,074 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:27:00,074 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:27:00,074 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:27:00,075 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:27:00,075 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:27:00,075 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:27:00,076 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:27:00,076 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:27:00,077 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:27:00,077 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:27:00,077 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:27:00,077 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:27:00,078 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:27:00,078 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:27:00,078 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:27:00,078 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:27:00,078 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:27:00,078 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:27:00,079 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:27:00,079 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:27:00,079 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:27:00,079 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:27:00,079 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:27:00,080 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:27:00,080 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:27:00,080 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=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:27:00,403 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:27:00,420 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:27:00,425 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:27:00,427 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:27:00,427 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:27:00,428 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-21 17:27:00,495 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e93dbff82/ba61aff34278425e8dcaeff8a347f8c0/FLAGf4eefc85e [2020-08-21 17:27:00,885 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:27:00,885 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-industry-pattern/array_of_struct_ptr_flag_init.i [2020-08-21 17:27:00,893 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e93dbff82/ba61aff34278425e8dcaeff8a347f8c0/FLAGf4eefc85e [2020-08-21 17:27:01,245 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e93dbff82/ba61aff34278425e8dcaeff8a347f8c0 [2020-08-21 17:27:01,256 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:27:01,258 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:27:01,261 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:27:01,261 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:27:01,265 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:27:01,266 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:27:01" (1/1) ... [2020-08-21 17:27:01,269 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@284e4e1b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:01, skipping insertion in model container [2020-08-21 17:27:01,269 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:27:01" (1/1) ... [2020-08-21 17:27:01,278 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:27:01,298 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:27:01,546 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:27:01,553 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:27:01,573 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:27:01,587 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:27:01,588 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:01 WrapperNode [2020-08-21 17:27:01,588 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:27:01,589 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:27:01,589 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:27:01,589 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:27:01,672 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:01" (1/1) ... [2020-08-21 17:27:01,673 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:01" (1/1) ... [2020-08-21 17:27:01,683 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:01" (1/1) ... [2020-08-21 17:27:01,683 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:01" (1/1) ... [2020-08-21 17:27:01,707 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:01" (1/1) ... [2020-08-21 17:27:01,715 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:01" (1/1) ... [2020-08-21 17:27:01,716 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:01" (1/1) ... [2020-08-21 17:27:01,726 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:27:01,727 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:27:01,727 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:27:01,727 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:27:01,728 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:01" (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 17:27:01,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:27:01,786 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:27:01,787 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 17:27:01,787 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-21 17:27:01,787 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:27:01,787 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 17:27:01,787 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:27:01,788 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 17:27:01,788 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 17:27:01,788 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 17:27:01,788 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 17:27:01,788 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:27:01,788 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 17:27:01,789 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 17:27:01,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 17:27:01,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:27:01,789 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:27:02,090 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:27:02,091 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 17:27:02,094 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:27:02 BoogieIcfgContainer [2020-08-21 17:27:02,094 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:27:02,095 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:27:02,096 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:27:02,098 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:27:02,099 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:27:01" (1/3) ... [2020-08-21 17:27:02,100 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c78309f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:27:02, skipping insertion in model container [2020-08-21 17:27:02,100 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:01" (2/3) ... [2020-08-21 17:27:02,100 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c78309f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:27:02, skipping insertion in model container [2020-08-21 17:27:02,100 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:27:02" (3/3) ... [2020-08-21 17:27:02,102 INFO L109 eAbstractionObserver]: Analyzing ICFG array_of_struct_ptr_flag_init.i [2020-08-21 17:27:02,112 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:27:02,118 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 17:27:02,135 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 17:27:02,155 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:27:02,156 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:27:02,156 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:27:02,156 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:27:02,156 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:27:02,156 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:27:02,156 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:27:02,157 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:27:02,172 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 17:27:02,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 17:27:02,177 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:02,178 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 17:27:02,179 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:02,183 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:02,183 INFO L82 PathProgramCache]: Analyzing trace with hash -850547107, now seen corresponding path program 1 times [2020-08-21 17:27:02,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:02,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1686294805] [2020-08-21 17:27:02,192 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:02,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:02,368 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:02,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:02,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:02,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:02,419 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 17:27:02,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1686294805] [2020-08-21 17:27:02,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:02,422 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 17:27:02,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441215362] [2020-08-21 17:27:02,428 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 17:27:02,428 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:02,438 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 17:27:02,439 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:27:02,441 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-21 17:27:02,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:02,581 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-21 17:27:02,581 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 17:27:02,583 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 17:27:02,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:02,594 INFO L225 Difference]: With dead ends: 59 [2020-08-21 17:27:02,594 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 17:27:02,598 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 17:27:02,617 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 17:27:02,638 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 17:27:02,639 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 17:27:02,640 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 17:27:02,642 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-21 17:27:02,643 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:02,643 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 17:27:02,643 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 17:27:02,643 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 17:27:02,644 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 17:27:02,644 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:02,644 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 17:27:02,645 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:27:02,645 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:02,646 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:02,646 INFO L82 PathProgramCache]: Analyzing trace with hash 1453375688, now seen corresponding path program 1 times [2020-08-21 17:27:02,646 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:02,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1367499730] [2020-08-21 17:27:02,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:02,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:02,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:02,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:02,751 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:02,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:02,843 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 17:27:02,843 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1367499730] [2020-08-21 17:27:02,844 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:02,844 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 17:27:02,844 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1592544426] [2020-08-21 17:27:02,846 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 17:27:02,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:02,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 17:27:02,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:27:02,847 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 17:27:03,051 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:03,051 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-21 17:27:03,051 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 17:27:03,052 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-21 17:27:03,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:03,053 INFO L225 Difference]: With dead ends: 48 [2020-08-21 17:27:03,053 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 17:27:03,055 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 17:27:03,055 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 17:27:03,062 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 17:27:03,062 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 17:27:03,063 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-21 17:27:03,064 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-21 17:27:03,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:03,064 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-21 17:27:03,064 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 17:27:03,065 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-21 17:27:03,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 17:27:03,066 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:03,066 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 17:27:03,066 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:27:03,067 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:03,067 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:03,067 INFO L82 PathProgramCache]: Analyzing trace with hash -169907062, now seen corresponding path program 1 times [2020-08-21 17:27:03,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:03,068 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [609344229] [2020-08-21 17:27:03,068 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:03,088 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,138 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:03,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,160 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:03,168 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,266 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 17:27:03,266 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [609344229] [2020-08-21 17:27:03,267 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:03,267 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:27:03,267 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1621957813] [2020-08-21 17:27:03,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:27:03,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:03,268 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:27:03,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:27:03,269 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-21 17:27:03,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:03,454 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-21 17:27:03,454 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:27:03,455 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 17:27:03,455 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:03,456 INFO L225 Difference]: With dead ends: 50 [2020-08-21 17:27:03,456 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 17:27:03,457 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:27:03,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 17:27:03,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 17:27:03,463 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 17:27:03,464 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-21 17:27:03,464 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-21 17:27:03,464 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:03,465 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-21 17:27:03,465 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:27:03,465 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-21 17:27:03,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 17:27:03,466 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:03,466 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 17:27:03,466 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 17:27:03,467 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:03,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:03,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1071501364, now seen corresponding path program 2 times [2020-08-21 17:27:03,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:03,468 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1146101104] [2020-08-21 17:27:03,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:03,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:03,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,534 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:03,543 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,698 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 17:27:03,698 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1146101104] [2020-08-21 17:27:03,698 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:03,699 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 17:27:03,699 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470950052] [2020-08-21 17:27:03,700 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 17:27:03,700 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:03,700 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 17:27:03,700 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:27:03,701 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-21 17:27:03,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:03,867 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-21 17:27:03,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 17:27:03,867 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-21 17:27:03,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:03,868 INFO L225 Difference]: With dead ends: 52 [2020-08-21 17:27:03,869 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 17:27:03,869 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 17:27:03,870 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 17:27:03,875 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 17:27:03,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 17:27:03,876 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-21 17:27:03,876 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-21 17:27:03,877 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:03,877 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-21 17:27:03,877 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 17:27:03,877 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-21 17:27:03,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 17:27:03,878 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:03,878 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 17:27:03,879 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 17:27:03,879 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:03,879 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:03,879 INFO L82 PathProgramCache]: Analyzing trace with hash 79768206, now seen corresponding path program 3 times [2020-08-21 17:27:03,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:03,880 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [175873403] [2020-08-21 17:27:03,880 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:03,896 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,919 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:03,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,935 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:03,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:04,163 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 17:27:04,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [175873403] [2020-08-21 17:27:04,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:04,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 17:27:04,165 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2128459007] [2020-08-21 17:27:04,165 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 17:27:04,166 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:04,166 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 17:27:04,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:27:04,167 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-21 17:27:04,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:04,430 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-21 17:27:04,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 17:27:04,431 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-21 17:27:04,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:04,434 INFO L225 Difference]: With dead ends: 54 [2020-08-21 17:27:04,434 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 17:27:04,435 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 17:27:04,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 17:27:04,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 17:27:04,442 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 17:27:04,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-21 17:27:04,445 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-21 17:27:04,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:04,445 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-21 17:27:04,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 17:27:04,445 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-21 17:27:04,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 17:27:04,446 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:04,447 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 17:27:04,447 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 17:27:04,447 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:04,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:04,448 INFO L82 PathProgramCache]: Analyzing trace with hash -1651737392, now seen corresponding path program 4 times [2020-08-21 17:27:04,448 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:04,451 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1846300541] [2020-08-21 17:27:04,451 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:04,485 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:04,533 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:04,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:04,550 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:04,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:04,787 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 17:27:04,787 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1846300541] [2020-08-21 17:27:04,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:04,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 17:27:04,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718012710] [2020-08-21 17:27:04,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 17:27:04,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:04,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 17:27:04,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:27:04,790 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-21 17:27:04,970 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:04,970 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-21 17:27:04,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 17:27:04,971 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-21 17:27:04,971 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:04,972 INFO L225 Difference]: With dead ends: 56 [2020-08-21 17:27:04,972 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 17:27:04,973 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 17:27:04,973 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 17:27:04,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 17:27:04,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 17:27:04,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-21 17:27:04,979 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-21 17:27:04,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:04,980 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-21 17:27:04,980 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 17:27:04,980 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-21 17:27:04,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 17:27:04,981 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:04,981 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 17:27:04,982 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 17:27:04,982 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:04,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:04,982 INFO L82 PathProgramCache]: Analyzing trace with hash 818693778, now seen corresponding path program 5 times [2020-08-21 17:27:04,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:04,983 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1704209563] [2020-08-21 17:27:04,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:04,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:05,018 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:05,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:05,030 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:05,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:05,246 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 17:27:05,247 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1704209563] [2020-08-21 17:27:05,247 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:05,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 17:27:05,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1207164387] [2020-08-21 17:27:05,248 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 17:27:05,248 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:05,248 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 17:27:05,248 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:27:05,249 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-21 17:27:05,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:05,470 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-21 17:27:05,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 17:27:05,471 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 17:27:05,471 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:05,472 INFO L225 Difference]: With dead ends: 58 [2020-08-21 17:27:05,472 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 17:27:05,473 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 17:27:05,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 17:27:05,479 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 17:27:05,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 17:27:05,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 17:27:05,481 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-21 17:27:05,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:05,483 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 17:27:05,483 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 17:27:05,483 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 17:27:05,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 17:27:05,485 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:05,485 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 17:27:05,486 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 17:27:05,486 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:05,486 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:05,487 INFO L82 PathProgramCache]: Analyzing trace with hash -213866540, now seen corresponding path program 6 times [2020-08-21 17:27:05,487 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:05,487 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649267186] [2020-08-21 17:27:05,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:05,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:05,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:05,552 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:05,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:05,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:05,831 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 17:27:05,831 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1649267186] [2020-08-21 17:27:05,831 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:05,831 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 17:27:05,832 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1254293698] [2020-08-21 17:27:05,832 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 17:27:05,832 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:05,833 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 17:27:05,833 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:27:05,833 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-21 17:27:06,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:06,032 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-21 17:27:06,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 17:27:06,032 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-21 17:27:06,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:06,033 INFO L225 Difference]: With dead ends: 60 [2020-08-21 17:27:06,033 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 17:27:06,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:27:06,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 17:27:06,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 17:27:06,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 17:27:06,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 17:27:06,048 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-21 17:27:06,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:06,048 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 17:27:06,048 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 17:27:06,048 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 17:27:06,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 17:27:06,049 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:06,049 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 17:27:06,050 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 17:27:06,050 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:06,050 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:06,050 INFO L82 PathProgramCache]: Analyzing trace with hash -366886762, now seen corresponding path program 7 times [2020-08-21 17:27:06,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:06,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [555106983] [2020-08-21 17:27:06,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:06,074 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:06,106 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:06,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:06,124 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:06,138 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:06,468 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 17:27:06,469 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [555106983] [2020-08-21 17:27:06,469 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:06,469 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 17:27:06,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [729642156] [2020-08-21 17:27:06,470 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 17:27:06,470 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:06,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 17:27:06,471 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:27:06,471 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-21 17:27:06,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:06,664 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 17:27:06,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 17:27:06,665 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-21 17:27:06,665 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:06,667 INFO L225 Difference]: With dead ends: 62 [2020-08-21 17:27:06,667 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 17:27:06,668 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 17:27:06,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 17:27:06,677 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 17:27:06,677 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 17:27:06,678 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-21 17:27:06,678 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-21 17:27:06,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:06,678 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-21 17:27:06,678 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 17:27:06,679 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-21 17:27:06,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 17:27:06,679 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:06,681 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 17:27:06,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 17:27:06,681 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:06,682 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:06,682 INFO L82 PathProgramCache]: Analyzing trace with hash -1390432040, now seen corresponding path program 8 times [2020-08-21 17:27:06,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:06,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [603509800] [2020-08-21 17:27:06,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:06,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:06,747 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:06,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:06,758 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:06,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,103 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 17:27:07,103 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [603509800] [2020-08-21 17:27:07,104 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:07,104 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 17:27:07,104 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104813170] [2020-08-21 17:27:07,105 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 17:27:07,105 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:07,105 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 17:27:07,105 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:27:07,106 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-21 17:27:07,352 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:07,352 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-21 17:27:07,353 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 17:27:07,353 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 17:27:07,353 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:07,354 INFO L225 Difference]: With dead ends: 64 [2020-08-21 17:27:07,354 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 17:27:07,355 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 17:27:07,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 17:27:07,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 17:27:07,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 17:27:07,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-21 17:27:07,362 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-21 17:27:07,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:07,362 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-21 17:27:07,362 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 17:27:07,363 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-21 17:27:07,363 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 17:27:07,363 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:07,364 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 17:27:07,364 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 17:27:07,364 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:07,364 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:07,365 INFO L82 PathProgramCache]: Analyzing trace with hash -1469933414, now seen corresponding path program 9 times [2020-08-21 17:27:07,365 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:07,365 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1201406926] [2020-08-21 17:27:07,365 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:07,380 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,406 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:07,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:07,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,443 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 17:27:07,444 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1201406926] [2020-08-21 17:27:07,444 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:07,444 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 17:27:07,445 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1454594975] [2020-08-21 17:27:07,445 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:27:07,445 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:07,446 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:27:07,446 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:07,446 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-21 17:27:07,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:07,532 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-21 17:27:07,533 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 17:27:07,533 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-21 17:27:07,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:07,535 INFO L225 Difference]: With dead ends: 65 [2020-08-21 17:27:07,535 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 17:27:07,537 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 17:27:07,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 17:27:07,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-21 17:27:07,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 17:27:07,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-21 17:27:07,559 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-21 17:27:07,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:07,559 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-21 17:27:07,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:27:07,559 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-21 17:27:07,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 17:27:07,560 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:07,560 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 17:27:07,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 17:27:07,561 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:07,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:07,563 INFO L82 PathProgramCache]: Analyzing trace with hash -1568016950, now seen corresponding path program 1 times [2020-08-21 17:27:07,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:07,564 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [875553464] [2020-08-21 17:27:07,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:07,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:07,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:07,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,662 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 17:27:07,663 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [875553464] [2020-08-21 17:27:07,663 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:07,663 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 17:27:07,664 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877588347] [2020-08-21 17:27:07,664 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 17:27:07,664 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:07,664 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 17:27:07,665 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:27:07,665 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-21 17:27:07,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:07,766 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-21 17:27:07,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:27:07,767 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-21 17:27:07,767 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:07,768 INFO L225 Difference]: With dead ends: 73 [2020-08-21 17:27:07,768 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 17:27:07,769 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 17:27:07,769 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 17:27:07,775 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-21 17:27:07,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 17:27:07,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 17:27:07,777 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-21 17:27:07,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:07,778 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 17:27:07,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 17:27:07,778 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 17:27:07,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 17:27:07,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:07,783 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 17:27:07,783 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 17:27:07,784 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:07,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:07,784 INFO L82 PathProgramCache]: Analyzing trace with hash 1298090650, now seen corresponding path program 2 times [2020-08-21 17:27:07,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:07,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [725478557] [2020-08-21 17:27:07,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:07,808 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:07,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:07,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,871 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 17:27:07,871 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [725478557] [2020-08-21 17:27:07,871 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:07,871 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 17:27:07,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [577674755] [2020-08-21 17:27:07,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:27:07,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:07,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:27:07,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:07,874 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 17:27:07,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:07,948 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-21 17:27:07,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 17:27:07,949 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-21 17:27:07,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:07,950 INFO L225 Difference]: With dead ends: 69 [2020-08-21 17:27:07,950 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 17:27:07,950 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 17:27:07,951 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 17:27:07,958 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 17:27:07,958 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 17:27:07,959 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-21 17:27:07,959 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-21 17:27:07,959 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:07,960 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-21 17:27:07,961 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:27:07,961 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-21 17:27:07,961 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 17:27:07,961 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:07,962 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 17:27:07,962 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 17:27:07,962 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:07,962 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:07,962 INFO L82 PathProgramCache]: Analyzing trace with hash 318257626, now seen corresponding path program 1 times [2020-08-21 17:27:07,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:07,966 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [45071411] [2020-08-21 17:27:07,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:07,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:08,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,020 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:08,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,390 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 17:27:08,390 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [45071411] [2020-08-21 17:27:08,391 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:08,391 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 17:27:08,391 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421514627] [2020-08-21 17:27:08,392 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 17:27:08,392 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:08,392 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 17:27:08,392 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:27:08,393 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-21 17:27:08,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:08,640 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-21 17:27:08,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 17:27:08,640 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-21 17:27:08,641 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:08,642 INFO L225 Difference]: With dead ends: 74 [2020-08-21 17:27:08,642 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 17:27:08,643 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 17:27:08,643 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 17:27:08,647 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 17:27:08,648 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 17:27:08,648 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-21 17:27:08,648 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-21 17:27:08,649 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:08,649 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-21 17:27:08,649 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 17:27:08,649 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-21 17:27:08,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 17:27:08,650 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:08,650 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 17:27:08,650 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 17:27:08,650 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:08,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:08,651 INFO L82 PathProgramCache]: Analyzing trace with hash -935313508, now seen corresponding path program 2 times [2020-08-21 17:27:08,651 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:08,651 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [17548558] [2020-08-21 17:27:08,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:08,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:08,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:08,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:09,145 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 17:27:09,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [17548558] [2020-08-21 17:27:09,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:09,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 17:27:09,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [238584875] [2020-08-21 17:27:09,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 17:27:09,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:09,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 17:27:09,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:27:09,149 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-21 17:27:09,395 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:09,395 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-21 17:27:09,395 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 17:27:09,396 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-21 17:27:09,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:09,396 INFO L225 Difference]: With dead ends: 76 [2020-08-21 17:27:09,396 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 17:27:09,397 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:27:09,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 17:27:09,402 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 17:27:09,402 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 17:27:09,402 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-21 17:27:09,403 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-21 17:27:09,403 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:09,403 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-21 17:27:09,403 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 17:27:09,403 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-21 17:27:09,404 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 17:27:09,404 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:09,404 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 17:27:09,404 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 17:27:09,404 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:09,405 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:09,405 INFO L82 PathProgramCache]: Analyzing trace with hash 1268636894, now seen corresponding path program 3 times [2020-08-21 17:27:09,405 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:09,405 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1195785062] [2020-08-21 17:27:09,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:09,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:09,438 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:09,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:09,449 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:09,457 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:09,931 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 17:27:09,932 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1195785062] [2020-08-21 17:27:09,932 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:09,932 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 17:27:09,932 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982248094] [2020-08-21 17:27:09,933 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 17:27:09,933 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:09,933 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 17:27:09,934 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:27:09,934 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-21 17:27:10,194 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:10,194 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-21 17:27:10,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 17:27:10,198 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 17:27:10,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:10,200 INFO L225 Difference]: With dead ends: 78 [2020-08-21 17:27:10,200 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 17:27:10,201 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:27:10,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 17:27:10,205 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 17:27:10,205 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 17:27:10,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-21 17:27:10,206 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-21 17:27:10,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:10,206 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-21 17:27:10,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 17:27:10,207 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-21 17:27:10,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 17:27:10,207 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:10,208 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 17:27:10,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 17:27:10,208 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:10,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:10,208 INFO L82 PathProgramCache]: Analyzing trace with hash 1846096288, now seen corresponding path program 4 times [2020-08-21 17:27:10,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:10,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2091069472] [2020-08-21 17:27:10,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:10,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:10,247 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:10,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:10,262 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:10,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:10,803 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 17:27:10,803 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2091069472] [2020-08-21 17:27:10,804 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:10,804 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 17:27:10,804 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515163209] [2020-08-21 17:27:10,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 17:27:10,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:10,805 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 17:27:10,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:27:10,806 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-21 17:27:11,059 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:11,059 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-21 17:27:11,059 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 17:27:11,060 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-21 17:27:11,060 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:11,061 INFO L225 Difference]: With dead ends: 80 [2020-08-21 17:27:11,061 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 17:27:11,061 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 17:27:11,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 17:27:11,065 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 17:27:11,065 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 17:27:11,066 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-21 17:27:11,066 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-21 17:27:11,066 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:11,067 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-21 17:27:11,067 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 17:27:11,067 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-21 17:27:11,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 17:27:11,067 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:11,068 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 17:27:11,068 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 17:27:11,068 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:11,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:11,068 INFO L82 PathProgramCache]: Analyzing trace with hash -1561174558, now seen corresponding path program 5 times [2020-08-21 17:27:11,068 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:11,069 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [72543135] [2020-08-21 17:27:11,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:11,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:11,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:11,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:11,115 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:11,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:11,653 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 17:27:11,654 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [72543135] [2020-08-21 17:27:11,654 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:11,654 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 17:27:11,654 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1023540115] [2020-08-21 17:27:11,654 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 17:27:11,655 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:11,655 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 17:27:11,655 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:27:11,655 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-21 17:27:11,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:11,914 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-21 17:27:11,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 17:27:11,914 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-21 17:27:11,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:11,915 INFO L225 Difference]: With dead ends: 82 [2020-08-21 17:27:11,915 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 17:27:11,916 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:27:11,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 17:27:11,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 17:27:11,920 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 17:27:11,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-21 17:27:11,921 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-21 17:27:11,921 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:11,921 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-21 17:27:11,921 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 17:27:11,921 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-21 17:27:11,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 17:27:11,922 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:11,922 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 17:27:11,922 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 17:27:11,923 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:11,923 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:11,923 INFO L82 PathProgramCache]: Analyzing trace with hash 1111589284, now seen corresponding path program 6 times [2020-08-21 17:27:11,923 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:11,924 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1924813323] [2020-08-21 17:27:11,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:11,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:11,959 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:11,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:11,982 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:11,992 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:12,791 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 17:27:12,791 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1924813323] [2020-08-21 17:27:12,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:12,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 17:27:12,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249559248] [2020-08-21 17:27:12,796 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 17:27:12,796 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:12,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 17:27:12,797 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:27:12,797 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-21 17:27:13,114 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:13,114 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-21 17:27:13,115 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 17:27:13,115 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-21 17:27:13,115 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:13,116 INFO L225 Difference]: With dead ends: 84 [2020-08-21 17:27:13,116 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 17:27:13,117 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:27:13,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 17:27:13,121 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 17:27:13,121 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 17:27:13,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-21 17:27:13,122 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-21 17:27:13,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:13,122 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-21 17:27:13,122 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 17:27:13,122 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-21 17:27:13,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 17:27:13,125 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:13,125 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 17:27:13,125 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 17:27:13,125 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:13,126 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:13,126 INFO L82 PathProgramCache]: Analyzing trace with hash 1247198438, now seen corresponding path program 7 times [2020-08-21 17:27:13,126 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:13,126 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [646548521] [2020-08-21 17:27:13,126 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:13,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:13,177 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:13,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:13,187 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:13,197 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:13,856 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 17:27:13,856 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [646548521] [2020-08-21 17:27:13,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:13,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 17:27:13,857 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [387404112] [2020-08-21 17:27:13,857 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 17:27:13,857 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:13,857 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 17:27:13,858 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:27:13,858 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-21 17:27:14,106 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:14,106 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-21 17:27:14,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 17:27:14,107 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-21 17:27:14,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:14,107 INFO L225 Difference]: With dead ends: 86 [2020-08-21 17:27:14,107 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 17:27:14,108 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 17:27:14,109 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 17:27:14,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 17:27:14,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 17:27:14,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-21 17:27:14,116 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-21 17:27:14,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:14,116 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-21 17:27:14,116 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 17:27:14,117 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-21 17:27:14,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 17:27:14,118 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:14,118 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 17:27:14,119 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 17:27:14,120 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:14,120 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:14,120 INFO L82 PathProgramCache]: Analyzing trace with hash -1576390744, now seen corresponding path program 8 times [2020-08-21 17:27:14,120 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:14,121 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2123732429] [2020-08-21 17:27:14,121 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:14,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:14,159 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:14,160 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:14,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:14,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:14,896 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 17:27:14,896 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2123732429] [2020-08-21 17:27:14,896 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:14,896 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 17:27:14,897 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954960864] [2020-08-21 17:27:14,897 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 17:27:14,897 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:14,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 17:27:14,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:27:14,898 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-21 17:27:15,204 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:15,204 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-21 17:27:15,205 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 17:27:15,205 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-21 17:27:15,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:15,206 INFO L225 Difference]: With dead ends: 88 [2020-08-21 17:27:15,206 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 17:27:15,207 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 17:27:15,208 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 17:27:15,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 17:27:15,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 17:27:15,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-21 17:27:15,213 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-21 17:27:15,213 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:15,213 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-21 17:27:15,213 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 17:27:15,214 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-21 17:27:15,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 17:27:15,214 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:15,214 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 17:27:15,215 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 17:27:15,215 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:15,215 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:15,215 INFO L82 PathProgramCache]: Analyzing trace with hash -626263574, now seen corresponding path program 9 times [2020-08-21 17:27:15,215 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:15,216 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1948742510] [2020-08-21 17:27:15,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:15,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:15,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:15,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:15,268 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:15,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:16,082 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 17:27:16,083 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1948742510] [2020-08-21 17:27:16,083 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:16,083 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 17:27:16,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12989613] [2020-08-21 17:27:16,084 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 17:27:16,084 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:16,084 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 17:27:16,085 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:27:16,085 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-21 17:27:16,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:16,408 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-21 17:27:16,411 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 17:27:16,411 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-21 17:27:16,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:16,412 INFO L225 Difference]: With dead ends: 90 [2020-08-21 17:27:16,413 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 17:27:16,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-21 17:27:16,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 17:27:16,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 17:27:16,419 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 17:27:16,420 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-21 17:27:16,420 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-21 17:27:16,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:16,420 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-21 17:27:16,420 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 17:27:16,420 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-21 17:27:16,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 17:27:16,421 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:16,421 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 17:27:16,421 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 17:27:16,422 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:16,422 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:16,422 INFO L82 PathProgramCache]: Analyzing trace with hash 1912880044, now seen corresponding path program 10 times [2020-08-21 17:27:16,422 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:16,422 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [283914440] [2020-08-21 17:27:16,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:16,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:16,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:16,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:16,475 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:16,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:17,319 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 17:27:17,319 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [283914440] [2020-08-21 17:27:17,319 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:17,320 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 17:27:17,320 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1161841543] [2020-08-21 17:27:17,320 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 17:27:17,320 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:17,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 17:27:17,321 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-21 17:27:17,321 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-21 17:27:17,597 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:17,597 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-21 17:27:17,597 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 17:27:17,598 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-21 17:27:17,598 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:17,598 INFO L225 Difference]: With dead ends: 92 [2020-08-21 17:27:17,598 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 17:27:17,599 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 17:27:17,600 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 17:27:17,603 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 17:27:17,604 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 17:27:17,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-21 17:27:17,604 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-21 17:27:17,605 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:17,605 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-21 17:27:17,605 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 17:27:17,605 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-21 17:27:17,606 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 17:27:17,606 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:17,606 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 17:27:17,606 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 17:27:17,606 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:17,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:17,607 INFO L82 PathProgramCache]: Analyzing trace with hash -1806494482, now seen corresponding path program 11 times [2020-08-21 17:27:17,607 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:17,607 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1278981064] [2020-08-21 17:27:17,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:17,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:17,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:17,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:17,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:17,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:18,517 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 17:27:18,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1278981064] [2020-08-21 17:27:18,518 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:18,518 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 17:27:18,518 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1175285308] [2020-08-21 17:27:18,518 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 17:27:18,519 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:18,519 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 17:27:18,519 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-21 17:27:18,519 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-21 17:27:18,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:18,865 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-21 17:27:18,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 17:27:18,865 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-21 17:27:18,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:18,866 INFO L225 Difference]: With dead ends: 94 [2020-08-21 17:27:18,867 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 17:27:18,867 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-21 17:27:18,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 17:27:18,873 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 17:27:18,873 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 17:27:18,874 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-21 17:27:18,874 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-21 17:27:18,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:18,874 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-21 17:27:18,874 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 17:27:18,874 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-21 17:27:18,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 17:27:18,875 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:18,875 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 17:27:18,878 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 17:27:18,880 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:18,880 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:18,880 INFO L82 PathProgramCache]: Analyzing trace with hash 1582343600, now seen corresponding path program 12 times [2020-08-21 17:27:18,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:18,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1868051758] [2020-08-21 17:27:18,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:18,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:18,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:18,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:18,928 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:18,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:19,861 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 17:27:19,862 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1868051758] [2020-08-21 17:27:19,862 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:19,862 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 17:27:19,862 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1753176723] [2020-08-21 17:27:19,863 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 17:27:19,863 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:19,863 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 17:27:19,864 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-21 17:27:19,864 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-21 17:27:20,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:20,220 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-21 17:27:20,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 17:27:20,220 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-21 17:27:20,220 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:20,221 INFO L225 Difference]: With dead ends: 96 [2020-08-21 17:27:20,221 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 17:27:20,221 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 17:27:20,222 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 17:27:20,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 17:27:20,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 17:27:20,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-21 17:27:20,225 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-21 17:27:20,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:20,226 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-21 17:27:20,226 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 17:27:20,226 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-21 17:27:20,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 17:27:20,227 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:20,227 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 17:27:20,227 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 17:27:20,227 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:20,227 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:20,228 INFO L82 PathProgramCache]: Analyzing trace with hash -1624437262, now seen corresponding path program 13 times [2020-08-21 17:27:20,228 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:20,228 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [693434137] [2020-08-21 17:27:20,228 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:20,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:20,282 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:20,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:20,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:20,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:21,324 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 17:27:21,324 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [693434137] [2020-08-21 17:27:21,325 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:21,325 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 17:27:21,325 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1326524079] [2020-08-21 17:27:21,325 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 17:27:21,325 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:21,326 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 17:27:21,326 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:27:21,326 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-21 17:27:21,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:21,565 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-21 17:27:21,565 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 17:27:21,566 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-21 17:27:21,566 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:21,567 INFO L225 Difference]: With dead ends: 98 [2020-08-21 17:27:21,567 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 17:27:21,568 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 17:27:21,569 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 17:27:21,572 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 17:27:21,572 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 17:27:21,573 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-21 17:27:21,573 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-21 17:27:21,573 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:21,573 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-21 17:27:21,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 17:27:21,574 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-21 17:27:21,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 17:27:21,575 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:21,575 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 17:27:21,575 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 17:27:21,575 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:21,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:21,576 INFO L82 PathProgramCache]: Analyzing trace with hash 445672884, now seen corresponding path program 14 times [2020-08-21 17:27:21,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:21,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [210004518] [2020-08-21 17:27:21,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:21,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:21,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:21,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:21,640 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:21,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:22,903 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 17:27:22,903 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [210004518] [2020-08-21 17:27:22,903 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:22,903 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 17:27:22,904 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1142506431] [2020-08-21 17:27:22,904 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 17:27:22,904 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:22,904 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 17:27:22,904 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-21 17:27:22,905 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-21 17:27:23,247 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:23,247 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-21 17:27:23,248 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 17:27:23,248 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-21 17:27:23,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:23,249 INFO L225 Difference]: With dead ends: 100 [2020-08-21 17:27:23,249 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 17:27:23,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-21 17:27:23,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 17:27:23,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 17:27:23,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 17:27:23,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-21 17:27:23,256 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-21 17:27:23,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:23,256 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-21 17:27:23,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 17:27:23,256 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-21 17:27:23,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 17:27:23,257 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:23,257 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 17:27:23,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 17:27:23,257 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:23,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:23,258 INFO L82 PathProgramCache]: Analyzing trace with hash 1251665142, now seen corresponding path program 15 times [2020-08-21 17:27:23,258 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:23,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1974621869] [2020-08-21 17:27:23,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:23,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:23,310 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:23,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:23,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:23,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:24,478 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 17:27:24,479 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1974621869] [2020-08-21 17:27:24,479 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:24,479 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 17:27:24,479 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977835464] [2020-08-21 17:27:24,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 17:27:24,480 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:24,480 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 17:27:24,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-21 17:27:24,480 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-21 17:27:24,855 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:24,855 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-21 17:27:24,856 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 17:27:24,856 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-21 17:27:24,856 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:24,857 INFO L225 Difference]: With dead ends: 102 [2020-08-21 17:27:24,857 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 17:27:24,858 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-21 17:27:24,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 17:27:24,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 17:27:24,863 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 17:27:24,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-21 17:27:24,864 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-21 17:27:24,864 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:24,864 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-21 17:27:24,864 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 17:27:24,864 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-21 17:27:24,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 17:27:24,865 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:24,865 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 17:27:24,865 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 17:27:24,865 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:24,865 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:24,866 INFO L82 PathProgramCache]: Analyzing trace with hash -1578855496, now seen corresponding path program 16 times [2020-08-21 17:27:24,866 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:24,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [86083834] [2020-08-21 17:27:24,866 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:24,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:24,923 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:24,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:24,934 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:24,950 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:26,204 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 17:27:26,204 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [86083834] [2020-08-21 17:27:26,204 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:26,205 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 17:27:26,205 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249697174] [2020-08-21 17:27:26,205 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 17:27:26,205 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:26,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 17:27:26,206 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-21 17:27:26,206 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-21 17:27:26,518 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:26,518 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-21 17:27:26,519 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 17:27:26,519 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-21 17:27:26,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:26,520 INFO L225 Difference]: With dead ends: 104 [2020-08-21 17:27:26,520 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 17:27:26,521 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 17:27:26,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 17:27:26,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 17:27:26,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 17:27:26,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-21 17:27:26,527 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-21 17:27:26,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:26,527 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-21 17:27:26,527 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 17:27:26,528 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-21 17:27:26,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 17:27:26,528 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:26,528 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 17:27:26,529 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 17:27:26,529 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:26,529 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:26,529 INFO L82 PathProgramCache]: Analyzing trace with hash 1300077050, now seen corresponding path program 17 times [2020-08-21 17:27:26,529 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:26,530 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2026277071] [2020-08-21 17:27:26,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:26,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:26,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:26,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:26,599 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:26,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:27,869 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 17:27:27,869 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2026277071] [2020-08-21 17:27:27,870 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:27,870 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 17:27:27,870 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1073413568] [2020-08-21 17:27:27,870 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 17:27:27,870 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:27,871 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 17:27:27,871 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-21 17:27:27,871 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-21 17:27:28,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:28,303 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-21 17:27:28,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 17:27:28,303 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-21 17:27:28,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:28,304 INFO L225 Difference]: With dead ends: 106 [2020-08-21 17:27:28,304 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 17:27:28,305 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:27:28,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 17:27:28,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 17:27:28,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 17:27:28,310 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-21 17:27:28,310 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-21 17:27:28,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:28,310 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-21 17:27:28,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 17:27:28,310 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-21 17:27:28,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 17:27:28,311 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:28,311 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 17:27:28,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 17:27:28,311 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:28,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:28,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1995315132, now seen corresponding path program 18 times [2020-08-21 17:27:28,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:28,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [809310934] [2020-08-21 17:27:28,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:28,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:28,360 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:28,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:28,371 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:28,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:29,788 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 17:27:29,788 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [809310934] [2020-08-21 17:27:29,788 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:29,788 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 17:27:29,788 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [133257417] [2020-08-21 17:27:29,789 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 17:27:29,789 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:29,789 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 17:27:29,789 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-21 17:27:29,789 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-21 17:27:30,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:30,198 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-21 17:27:30,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 17:27:30,198 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-21 17:27:30,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:30,200 INFO L225 Difference]: With dead ends: 108 [2020-08-21 17:27:30,200 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 17:27:30,201 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 17:27:30,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 17:27:30,204 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 17:27:30,204 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 17:27:30,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-21 17:27:30,207 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-21 17:27:30,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:30,207 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-21 17:27:30,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 17:27:30,207 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-21 17:27:30,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 17:27:30,208 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:30,208 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 17:27:30,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 17:27:30,208 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:30,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:30,209 INFO L82 PathProgramCache]: Analyzing trace with hash 104213758, now seen corresponding path program 19 times [2020-08-21 17:27:30,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:30,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2064900581] [2020-08-21 17:27:30,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:30,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:30,281 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:30,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:30,307 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:30,327 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:31,779 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 17:27:31,779 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2064900581] [2020-08-21 17:27:31,780 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:31,780 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 17:27:31,780 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1994325143] [2020-08-21 17:27:31,780 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 17:27:31,780 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:31,781 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 17:27:31,781 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 17:27:31,781 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-21 17:27:32,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:32,242 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-21 17:27:32,247 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 17:27:32,247 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-21 17:27:32,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:32,249 INFO L225 Difference]: With dead ends: 110 [2020-08-21 17:27:32,249 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 17:27:32,250 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 17:27:32,250 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 17:27:32,253 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 17:27:32,253 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 17:27:32,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-21 17:27:32,254 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-21 17:27:32,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:32,254 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-21 17:27:32,254 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 17:27:32,254 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-21 17:27:32,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 17:27:32,255 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:32,255 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 17:27:32,255 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 17:27:32,255 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:32,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:32,255 INFO L82 PathProgramCache]: Analyzing trace with hash -473040448, now seen corresponding path program 20 times [2020-08-21 17:27:32,256 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:32,256 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1545148260] [2020-08-21 17:27:32,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:32,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:32,314 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:32,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:32,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:32,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:33,871 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 17:27:33,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1545148260] [2020-08-21 17:27:33,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:33,872 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 17:27:33,872 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [276323931] [2020-08-21 17:27:33,872 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 17:27:33,872 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:33,873 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 17:27:33,873 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:27:33,874 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-21 17:27:34,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:34,335 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-21 17:27:34,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 17:27:34,336 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-21 17:27:34,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:34,337 INFO L225 Difference]: With dead ends: 112 [2020-08-21 17:27:34,337 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 17:27:34,339 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 17:27:34,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 17:27:34,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 17:27:34,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 17:27:34,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-21 17:27:34,344 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-21 17:27:34,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:34,344 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-21 17:27:34,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 17:27:34,345 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-21 17:27:34,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 17:27:34,346 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:34,347 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 17:27:34,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 17:27:34,351 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:34,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:34,353 INFO L82 PathProgramCache]: Analyzing trace with hash -1163551230, now seen corresponding path program 21 times [2020-08-21 17:27:34,353 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:34,354 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1351047027] [2020-08-21 17:27:34,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:34,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:34,419 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:34,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:34,431 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:34,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:36,066 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 17:27:36,066 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1351047027] [2020-08-21 17:27:36,066 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:36,066 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 17:27:36,066 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729278572] [2020-08-21 17:27:36,067 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 17:27:36,067 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:36,067 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 17:27:36,067 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 17:27:36,068 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-21 17:27:36,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:36,621 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-21 17:27:36,621 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 17:27:36,621 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-21 17:27:36,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:36,622 INFO L225 Difference]: With dead ends: 114 [2020-08-21 17:27:36,622 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 17:27:36,625 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 17:27:36,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 17:27:36,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 17:27:36,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 17:27:36,636 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-21 17:27:36,636 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-21 17:27:36,636 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:36,636 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-21 17:27:36,637 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 17:27:36,637 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-21 17:27:36,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 17:27:36,637 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:36,637 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 17:27:36,638 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 17:27:36,638 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:36,638 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:36,638 INFO L82 PathProgramCache]: Analyzing trace with hash 975518148, now seen corresponding path program 22 times [2020-08-21 17:27:36,638 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:36,647 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [40893326] [2020-08-21 17:27:36,647 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:36,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:36,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:36,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:36,714 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:36,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,420 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 17:27:38,420 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [40893326] [2020-08-21 17:27:38,420 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:38,420 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 17:27:38,420 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512408460] [2020-08-21 17:27:38,421 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 17:27:38,421 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:38,421 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 17:27:38,422 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 17:27:38,422 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-21 17:27:38,793 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:38,793 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-21 17:27:38,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 17:27:38,794 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-21 17:27:38,794 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:38,795 INFO L225 Difference]: With dead ends: 116 [2020-08-21 17:27:38,796 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 17:27:38,797 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 17:27:38,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 17:27:38,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 17:27:38,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 17:27:38,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-21 17:27:38,802 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-21 17:27:38,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:38,802 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-21 17:27:38,803 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 17:27:38,803 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-21 17:27:38,803 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 17:27:38,803 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:38,803 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 17:27:38,804 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 17:27:38,804 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:38,804 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:38,804 INFO L82 PathProgramCache]: Analyzing trace with hash -668144378, now seen corresponding path program 23 times [2020-08-21 17:27:38,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:38,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1953865921] [2020-08-21 17:27:38,805 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:38,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,871 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:38,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:38,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:40,694 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 17:27:40,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1953865921] [2020-08-21 17:27:40,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:40,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 17:27:40,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2837467] [2020-08-21 17:27:40,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 17:27:40,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:40,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 17:27:40,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 17:27:40,696 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-21 17:27:41,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:41,192 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-21 17:27:41,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 17:27:41,193 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-21 17:27:41,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:41,195 INFO L225 Difference]: With dead ends: 118 [2020-08-21 17:27:41,195 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 17:27:41,196 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 17:27:41,197 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 17:27:41,199 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 17:27:41,200 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 17:27:41,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-21 17:27:41,200 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-21 17:27:41,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:41,201 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-21 17:27:41,201 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 17:27:41,201 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-21 17:27:41,202 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 17:27:41,202 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:41,202 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 17:27:41,202 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 17:27:41,202 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:41,203 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:41,203 INFO L82 PathProgramCache]: Analyzing trace with hash 320133064, now seen corresponding path program 24 times [2020-08-21 17:27:41,203 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:41,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1440177664] [2020-08-21 17:27:41,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:41,225 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:41,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:41,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:43,242 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 17:27:43,243 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1440177664] [2020-08-21 17:27:43,243 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:43,243 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 17:27:43,243 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247596069] [2020-08-21 17:27:43,243 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 17:27:43,244 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:43,244 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 17:27:43,244 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 17:27:43,245 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-21 17:27:43,667 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:43,667 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-21 17:27:43,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 17:27:43,668 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-21 17:27:43,668 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:43,669 INFO L225 Difference]: With dead ends: 120 [2020-08-21 17:27:43,669 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 17:27:43,670 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 17:27:43,670 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 17:27:43,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 17:27:43,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 17:27:43,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-21 17:27:43,674 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-21 17:27:43,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:43,674 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-21 17:27:43,674 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 17:27:43,675 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-21 17:27:43,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 17:27:43,675 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:43,675 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 17:27:43,675 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 17:27:43,676 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:43,676 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:43,676 INFO L82 PathProgramCache]: Analyzing trace with hash 866982410, now seen corresponding path program 25 times [2020-08-21 17:27:43,676 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:43,676 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1508646713] [2020-08-21 17:27:43,676 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:43,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:43,734 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:43,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:43,745 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:43,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:45,745 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 17:27:45,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1508646713] [2020-08-21 17:27:45,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:45,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 17:27:45,746 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489454906] [2020-08-21 17:27:45,746 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 17:27:45,746 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:45,747 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 17:27:45,747 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 17:27:45,747 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-21 17:27:46,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:46,090 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-21 17:27:46,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 17:27:46,090 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-21 17:27:46,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:46,091 INFO L225 Difference]: With dead ends: 122 [2020-08-21 17:27:46,092 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 17:27:46,093 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 17:27:46,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 17:27:46,097 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 17:27:46,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 17:27:46,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-21 17:27:46,098 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-21 17:27:46,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:46,098 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-21 17:27:46,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 17:27:46,098 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-21 17:27:46,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 17:27:46,099 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:46,099 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 17:27:46,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 17:27:46,099 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:46,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:46,100 INFO L82 PathProgramCache]: Analyzing trace with hash -1891773492, now seen corresponding path program 26 times [2020-08-21 17:27:46,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:46,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1916859600] [2020-08-21 17:27:46,100 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:46,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:46,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:46,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:46,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:46,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:48,254 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 17:27:48,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1916859600] [2020-08-21 17:27:48,254 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:48,254 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 17:27:48,254 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [290020320] [2020-08-21 17:27:48,255 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 17:27:48,255 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:48,255 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 17:27:48,256 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 17:27:48,256 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-21 17:27:48,579 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:48,580 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-21 17:27:48,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 17:27:48,580 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-21 17:27:48,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:48,581 INFO L225 Difference]: With dead ends: 124 [2020-08-21 17:27:48,582 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 17:27:48,583 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 17:27:48,584 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 17:27:48,587 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 17:27:48,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 17:27:48,588 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-21 17:27:48,589 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-21 17:27:48,589 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:48,589 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-21 17:27:48,589 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 17:27:48,589 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-21 17:27:48,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 17:27:48,590 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:48,590 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 17:27:48,590 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 17:27:48,590 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:48,591 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:48,591 INFO L82 PathProgramCache]: Analyzing trace with hash 1233593614, now seen corresponding path program 27 times [2020-08-21 17:27:48,591 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:48,591 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1562414534] [2020-08-21 17:27:48,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:48,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:48,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:48,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:48,665 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:48,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:50,844 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 17:27:50,845 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1562414534] [2020-08-21 17:27:50,845 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:50,845 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 17:27:50,845 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205005795] [2020-08-21 17:27:50,845 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 17:27:50,846 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:50,846 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 17:27:50,847 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 17:27:50,847 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-21 17:27:51,179 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:51,179 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-21 17:27:51,180 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 17:27:51,180 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-21 17:27:51,180 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:51,181 INFO L225 Difference]: With dead ends: 126 [2020-08-21 17:27:51,181 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 17:27:51,182 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 17:27:51,183 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 17:27:51,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 17:27:51,185 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 17:27:51,186 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-21 17:27:51,186 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-21 17:27:51,186 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:51,186 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-21 17:27:51,186 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 17:27:51,186 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-21 17:27:51,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 17:27:51,187 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:51,187 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 17:27:51,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 17:27:51,187 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:51,188 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:51,188 INFO L82 PathProgramCache]: Analyzing trace with hash -1765724720, now seen corresponding path program 28 times [2020-08-21 17:27:51,188 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:51,188 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [758539647] [2020-08-21 17:27:51,188 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:51,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:51,249 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:51,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:51,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:51,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:53,555 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 17:27:53,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [758539647] [2020-08-21 17:27:53,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:53,556 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 17:27:53,556 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382655037] [2020-08-21 17:27:53,556 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 17:27:53,556 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:53,557 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 17:27:53,557 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 17:27:53,557 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-21 17:27:54,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:54,014 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-21 17:27:54,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 17:27:54,014 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-21 17:27:54,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:54,015 INFO L225 Difference]: With dead ends: 128 [2020-08-21 17:27:54,016 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 17:27:54,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 17:27:54,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 17:27:54,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 17:27:54,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 17:27:54,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-21 17:27:54,025 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-21 17:27:54,026 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:54,026 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-21 17:27:54,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 17:27:54,026 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-21 17:27:54,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 17:27:54,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:54,027 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 17:27:54,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 17:27:54,027 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:54,028 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:54,028 INFO L82 PathProgramCache]: Analyzing trace with hash 2107379218, now seen corresponding path program 29 times [2020-08-21 17:27:54,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:54,028 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [605259514] [2020-08-21 17:27:54,028 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:54,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:54,129 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:54,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:54,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:54,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:56,582 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 17:27:56,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [605259514] [2020-08-21 17:27:56,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:56,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 17:27:56,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [806116365] [2020-08-21 17:27:56,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 17:27:56,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:56,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 17:27:56,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 17:27:56,585 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-21 17:27:57,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:57,206 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-21 17:27:57,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 17:27:57,206 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-21 17:27:57,207 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:57,207 INFO L225 Difference]: With dead ends: 130 [2020-08-21 17:27:57,207 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 17:27:57,208 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 17:27:57,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 17:27:57,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 17:27:57,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 17:27:57,215 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-21 17:27:57,215 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-21 17:27:57,216 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:57,216 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-21 17:27:57,216 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 17:27:57,216 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-21 17:27:57,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 17:27:57,218 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:57,218 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 17:27:57,218 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 17:27:57,218 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:57,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:57,219 INFO L82 PathProgramCache]: Analyzing trace with hash 423618004, now seen corresponding path program 30 times [2020-08-21 17:27:57,219 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:57,219 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [978879908] [2020-08-21 17:27:57,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:57,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,287 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:57,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:57,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat