/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=5 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 21:14:03,821 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 21:14:03,824 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 21:14:03,848 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 21:14:03,849 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 21:14:03,850 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 21:14:03,851 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 21:14:03,853 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 21:14:03,855 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 21:14:03,855 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 21:14:03,856 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 21:14:03,861 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 21:14:03,861 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 21:14:03,862 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 21:14:03,863 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 21:14:03,865 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 21:14:03,867 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 21:14:03,870 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 21:14:03,872 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 21:14:03,875 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 21:14:03,878 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 21:14:03,881 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 21:14:03,883 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 21:14:03,883 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 21:14:03,890 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 21:14:03,903 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 21:14:03,904 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 21:14:03,906 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 21:14:03,906 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 [2020-08-18 21:14:03,961 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 21:14:03,961 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 21:14:03,962 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 21:14:03,966 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 21:14:03,966 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 21:14:03,966 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 21:14:03,967 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 21:14:03,967 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 21:14:03,967 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 21:14:03,967 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 21:14:03,967 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 21:14:03,967 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 21:14:03,968 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 21:14:03,968 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 21:14:03,968 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 21:14:03,968 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 21:14:03,968 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 21:14:03,969 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 21:14:03,972 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 21:14:03,972 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 21:14:03,972 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 21:14:03,972 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:14:03,973 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 21:14:03,973 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 21:14:03,973 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 21:14:03,973 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 21:14:03,973 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 21:14:03,974 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 21:14:03,974 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 21:14:03,974 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=5;interpolation-heuristic=DEEPEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=DEEPEST; [2020-08-18 21:14:04,288 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 21:14:04,306 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 21:14:04,309 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 21:14:04,311 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 21:14:04,312 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 21:14:04,314 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-18 21:14:04,378 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/09330ecdc/ad4cdfe3fbd6496a958c2e4bce33295f/FLAG5e1cb8061 [2020-08-18 21:14:04,845 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 21:14:04,846 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-18 21:14:04,851 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/09330ecdc/ad4cdfe3fbd6496a958c2e4bce33295f/FLAG5e1cb8061 [2020-08-18 21:14:05,199 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/09330ecdc/ad4cdfe3fbd6496a958c2e4bce33295f [2020-08-18 21:14:05,207 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 21:14:05,209 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 21:14:05,212 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 21:14:05,212 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 21:14:05,216 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 21:14:05,217 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:14:05" (1/1) ... [2020-08-18 21:14:05,220 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@518dc62a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:05, skipping insertion in model container [2020-08-18 21:14:05,221 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:14:05" (1/1) ... [2020-08-18 21:14:05,229 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 21:14:05,249 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 21:14:05,453 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:14:05,457 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 21:14:05,477 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:14:05,497 INFO L208 MainTranslator]: Completed translation [2020-08-18 21:14:05,497 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:05 WrapperNode [2020-08-18 21:14:05,498 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 21:14:05,498 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 21:14:05,499 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 21:14:05,499 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 21:14:05,593 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:05" (1/1) ... [2020-08-18 21:14:05,595 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:05" (1/1) ... [2020-08-18 21:14:05,603 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:05" (1/1) ... [2020-08-18 21:14:05,603 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:05" (1/1) ... [2020-08-18 21:14:05,610 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:05" (1/1) ... [2020-08-18 21:14:05,616 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:05" (1/1) ... [2020-08-18 21:14:05,617 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:05" (1/1) ... [2020-08-18 21:14:05,619 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 21:14:05,619 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 21:14:05,619 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 21:14:05,619 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 21:14:05,620 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:05" (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 [2020-08-18 21:14:05,677 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 21:14:05,677 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 21:14:05,678 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 21:14:05,678 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 21:14:05,678 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 21:14:05,678 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 21:14:05,679 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 21:14:05,679 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 21:14:05,680 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-18 21:14:05,681 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-18 21:14:05,681 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 21:14:05,681 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 21:14:05,681 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 21:14:05,880 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 21:14:05,880 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-18 21:14:05,884 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:14:05 BoogieIcfgContainer [2020-08-18 21:14:05,884 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 21:14:05,885 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 21:14:05,885 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 21:14:05,888 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 21:14:05,888 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 09:14:05" (1/3) ... [2020-08-18 21:14:05,889 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f7fa9a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:14:05, skipping insertion in model container [2020-08-18 21:14:05,889 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:14:05" (2/3) ... [2020-08-18 21:14:05,890 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f7fa9a4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:14:05, skipping insertion in model container [2020-08-18 21:14:05,890 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:14:05" (3/3) ... [2020-08-18 21:14:05,891 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-18 21:14:05,901 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 21:14:05,908 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 21:14:05,921 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 21:14:05,942 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 21:14:05,942 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 21:14:05,942 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 21:14:05,942 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 21:14:05,942 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 21:14:05,943 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 21:14:05,943 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 21:14:05,943 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 21:14:05,958 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-18 21:14:05,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 21:14:05,963 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:05,964 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:05,965 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:05,969 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:05,969 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-18 21:14:05,976 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:05,977 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1173928095] [2020-08-18 21:14:05,977 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:06,058 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,148 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:06,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,159 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:06,160 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1173928095] [2020-08-18 21:14:06,165 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:14:06,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-18 21:14:06,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585166762] [2020-08-18 21:14:06,180 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-18 21:14:06,181 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:06,205 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-18 21:14:06,207 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 21:14:06,212 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-18 21:14:06,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:06,312 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-18 21:14:06,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 21:14:06,314 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-18 21:14:06,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:06,321 INFO L225 Difference]: With dead ends: 34 [2020-08-18 21:14:06,322 INFO L226 Difference]: Without dead ends: 14 [2020-08-18 21:14:06,325 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-18 21:14:06,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-18 21:14:06,360 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-18 21:14:06,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-18 21:14:06,362 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-18 21:14:06,364 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-18 21:14:06,365 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:06,365 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-18 21:14:06,365 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-18 21:14:06,365 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-18 21:14:06,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-18 21:14:06,369 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:06,369 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:06,369 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 21:14:06,370 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:06,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:06,370 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-18 21:14:06,371 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:06,371 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1037308525] [2020-08-18 21:14:06,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:06,396 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:06,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,453 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:06,453 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1037308525] [2020-08-18 21:14:06,454 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:14:06,454 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 21:14:06,454 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1472238816] [2020-08-18 21:14:06,456 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 21:14:06,457 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:06,458 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 21:14:06,458 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:14:06,458 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-18 21:14:06,517 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:06,517 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-18 21:14:06,518 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 21:14:06,518 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-18 21:14:06,519 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:06,519 INFO L225 Difference]: With dead ends: 22 [2020-08-18 21:14:06,520 INFO L226 Difference]: Without dead ends: 16 [2020-08-18 21:14:06,521 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:14:06,521 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-18 21:14:06,526 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-18 21:14:06,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-18 21:14:06,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-18 21:14:06,528 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-18 21:14:06,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:06,528 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-18 21:14:06,529 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 21:14:06,529 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-18 21:14:06,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-18 21:14:06,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:06,530 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:06,530 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 21:14:06,530 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:06,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:06,531 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-18 21:14:06,531 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:06,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2137386947] [2020-08-18 21:14:06,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:06,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:06,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,599 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:06,600 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2137386947] [2020-08-18 21:14:06,600 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:06,601 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-18 21:14:06,601 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314387962] [2020-08-18 21:14:06,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:14:06,602 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:06,602 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:14:06,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:14:06,603 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-18 21:14:06,649 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:06,649 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-18 21:14:06,650 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:14:06,650 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-18 21:14:06,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:06,652 INFO L225 Difference]: With dead ends: 24 [2020-08-18 21:14:06,652 INFO L226 Difference]: Without dead ends: 18 [2020-08-18 21:14:06,653 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:14:06,654 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-18 21:14:06,658 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-18 21:14:06,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-18 21:14:06,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-18 21:14:06,659 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-18 21:14:06,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:06,659 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-18 21:14:06,660 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:14:06,660 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-18 21:14:06,660 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-18 21:14:06,661 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:06,661 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:06,661 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 21:14:06,661 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:06,662 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:06,662 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-18 21:14:06,662 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:06,663 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [500820001] [2020-08-18 21:14:06,663 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:06,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:06,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,746 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:06,746 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [500820001] [2020-08-18 21:14:06,747 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:06,747 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 21:14:06,747 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888055231] [2020-08-18 21:14:06,748 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:14:06,748 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:06,748 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:14:06,749 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:14:06,749 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-18 21:14:06,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:06,803 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-18 21:14:06,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 21:14:06,804 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-18 21:14:06,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:06,805 INFO L225 Difference]: With dead ends: 26 [2020-08-18 21:14:06,805 INFO L226 Difference]: Without dead ends: 20 [2020-08-18 21:14:06,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:14:06,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-18 21:14:06,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-18 21:14:06,810 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-18 21:14:06,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-18 21:14:06,811 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-18 21:14:06,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:06,812 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-18 21:14:06,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:14:06,812 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-18 21:14:06,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-18 21:14:06,813 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:06,813 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:06,814 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 21:14:06,814 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:06,814 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:06,814 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-18 21:14:06,815 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:06,815 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1501284633] [2020-08-18 21:14:06,815 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:06,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,929 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:06,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,936 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:06,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1501284633] [2020-08-18 21:14:06,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:06,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 21:14:06,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943690786] [2020-08-18 21:14:06,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:14:06,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:06,939 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:14:06,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:14:06,939 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-18 21:14:07,019 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,019 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-18 21:14:07,020 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:14:07,020 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-18 21:14:07,020 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,021 INFO L225 Difference]: With dead ends: 28 [2020-08-18 21:14:07,021 INFO L226 Difference]: Without dead ends: 22 [2020-08-18 21:14:07,022 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:14:07,022 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-18 21:14:07,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-18 21:14:07,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-18 21:14:07,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-18 21:14:07,027 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-18 21:14:07,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,028 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-18 21:14:07,028 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:14:07,028 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-18 21:14:07,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 21:14:07,029 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,029 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 21:14:07,030 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,030 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-18 21:14:07,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,031 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [668062000] [2020-08-18 21:14:07,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,048 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,128 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,139 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,140 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [668062000] [2020-08-18 21:14:07,140 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:07,140 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 21:14:07,141 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102677286] [2020-08-18 21:14:07,142 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 21:14:07,142 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,143 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 21:14:07,144 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:14:07,145 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-18 21:14:07,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,221 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-18 21:14:07,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 21:14:07,221 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-18 21:14:07,222 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,222 INFO L225 Difference]: With dead ends: 30 [2020-08-18 21:14:07,222 INFO L226 Difference]: Without dead ends: 24 [2020-08-18 21:14:07,223 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:14:07,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-18 21:14:07,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-18 21:14:07,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-18 21:14:07,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-18 21:14:07,228 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-18 21:14:07,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,229 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-18 21:14:07,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 21:14:07,229 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-18 21:14:07,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 21:14:07,230 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,230 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,230 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 21:14:07,231 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,231 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-18 21:14:07,231 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [632596206] [2020-08-18 21:14:07,232 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,320 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,325 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,325 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [632596206] [2020-08-18 21:14:07,326 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:07,326 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 21:14:07,326 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1827588412] [2020-08-18 21:14:07,327 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 21:14:07,327 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,327 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 21:14:07,328 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:14:07,328 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-18 21:14:07,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,388 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-18 21:14:07,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 21:14:07,389 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-18 21:14:07,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,390 INFO L225 Difference]: With dead ends: 32 [2020-08-18 21:14:07,390 INFO L226 Difference]: Without dead ends: 26 [2020-08-18 21:14:07,391 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:14:07,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-18 21:14:07,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-18 21:14:07,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-18 21:14:07,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-18 21:14:07,397 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-18 21:14:07,397 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,397 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-18 21:14:07,397 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 21:14:07,397 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-18 21:14:07,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 21:14:07,398 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,398 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,399 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 21:14:07,399 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,399 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,400 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-18 21:14:07,400 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,400 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [398140033] [2020-08-18 21:14:07,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,493 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,499 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [398140033] [2020-08-18 21:14:07,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:07,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 21:14:07,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744951394] [2020-08-18 21:14:07,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 21:14:07,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 21:14:07,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:14:07,501 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-18 21:14:07,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,575 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-18 21:14:07,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 21:14:07,576 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-18 21:14:07,576 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,577 INFO L225 Difference]: With dead ends: 34 [2020-08-18 21:14:07,577 INFO L226 Difference]: Without dead ends: 28 [2020-08-18 21:14:07,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:14:07,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-18 21:14:07,582 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-18 21:14:07,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-18 21:14:07,583 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-18 21:14:07,583 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-18 21:14:07,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,584 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-18 21:14:07,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 21:14:07,584 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-18 21:14:07,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 21:14:07,585 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,585 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 21:14:07,586 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,586 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-18 21:14:07,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1563867382] [2020-08-18 21:14:07,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,702 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,707 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1563867382] [2020-08-18 21:14:07,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:07,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 21:14:07,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1957236716] [2020-08-18 21:14:07,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 21:14:07,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,710 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 21:14:07,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:14:07,711 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-18 21:14:07,787 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:07,787 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-18 21:14:07,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 21:14:07,788 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-18 21:14:07,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:07,789 INFO L225 Difference]: With dead ends: 36 [2020-08-18 21:14:07,789 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 21:14:07,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:14:07,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 21:14:07,794 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 21:14:07,794 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 21:14:07,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-18 21:14:07,795 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-18 21:14:07,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:07,796 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-18 21:14:07,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 21:14:07,796 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-18 21:14:07,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 21:14:07,797 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:07,798 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:07,798 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 21:14:07,798 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:07,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:07,799 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-18 21:14:07,799 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:07,799 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1429215817] [2020-08-18 21:14:07,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:07,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,922 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:07,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:07,927 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:07,928 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1429215817] [2020-08-18 21:14:07,928 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:07,928 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 21:14:07,929 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1958014344] [2020-08-18 21:14:07,929 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 21:14:07,929 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:07,930 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 21:14:07,930 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:14:07,930 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-18 21:14:08,017 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:08,017 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-18 21:14:08,018 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 21:14:08,018 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-18 21:14:08,018 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:08,019 INFO L225 Difference]: With dead ends: 38 [2020-08-18 21:14:08,019 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 21:14:08,020 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:14:08,020 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 21:14:08,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 21:14:08,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 21:14:08,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-18 21:14:08,025 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-18 21:14:08,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,026 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-18 21:14:08,026 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 21:14:08,026 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-18 21:14:08,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 21:14:08,027 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,027 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,027 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 21:14:08,027 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,027 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,028 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-18 21:14:08,028 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,029 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1390340771] [2020-08-18 21:14:08,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,144 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:08,146 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,149 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:08,149 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1390340771] [2020-08-18 21:14:08,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:08,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 21:14:08,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [691495025] [2020-08-18 21:14:08,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 21:14:08,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:08,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 21:14:08,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:14:08,152 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-18 21:14:08,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:08,230 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-18 21:14:08,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 21:14:08,230 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-18 21:14:08,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:08,231 INFO L225 Difference]: With dead ends: 40 [2020-08-18 21:14:08,231 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 21:14:08,232 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:14:08,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 21:14:08,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 21:14:08,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 21:14:08,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-18 21:14:08,237 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-18 21:14:08,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,238 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-18 21:14:08,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 21:14:08,238 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-18 21:14:08,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 21:14:08,239 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,239 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 21:14:08,240 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,240 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-18 21:14:08,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [108424810] [2020-08-18 21:14:08,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,410 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:08,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,417 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:08,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [108424810] [2020-08-18 21:14:08,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:08,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 21:14:08,418 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [651810530] [2020-08-18 21:14:08,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 21:14:08,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:08,419 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 21:14:08,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 21:14:08,419 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-18 21:14:08,513 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:08,514 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-18 21:14:08,514 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 21:14:08,514 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-18 21:14:08,514 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:08,515 INFO L225 Difference]: With dead ends: 42 [2020-08-18 21:14:08,515 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 21:14:08,516 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-18 21:14:08,516 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 21:14:08,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 21:14:08,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 21:14:08,523 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-18 21:14:08,524 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-18 21:14:08,524 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,524 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-18 21:14:08,524 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 21:14:08,524 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-18 21:14:08,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 21:14:08,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,534 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,534 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 21:14:08,534 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,535 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-18 21:14:08,535 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,535 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730088519] [2020-08-18 21:14:08,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:08,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:08,737 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:08,738 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730088519] [2020-08-18 21:14:08,738 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:08,738 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 21:14:08,739 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [803009584] [2020-08-18 21:14:08,739 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 21:14:08,740 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:08,740 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 21:14:08,740 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-18 21:14:08,741 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-18 21:14:08,830 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:08,830 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-18 21:14:08,837 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 21:14:08,837 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-18 21:14:08,837 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:08,838 INFO L225 Difference]: With dead ends: 44 [2020-08-18 21:14:08,838 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 21:14:08,838 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-18 21:14:08,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 21:14:08,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 21:14:08,843 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 21:14:08,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-18 21:14:08,844 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-18 21:14:08,844 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:08,844 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-18 21:14:08,844 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 21:14:08,844 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-18 21:14:08,845 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 21:14:08,845 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:08,845 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:08,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 21:14:08,846 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:08,846 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:08,846 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-18 21:14:08,846 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:08,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [262798787] [2020-08-18 21:14:08,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:08,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,049 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:09,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,053 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:09,054 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [262798787] [2020-08-18 21:14:09,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:09,054 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 21:14:09,054 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749191247] [2020-08-18 21:14:09,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 21:14:09,055 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:09,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 21:14:09,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-18 21:14:09,056 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-18 21:14:09,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:09,121 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-18 21:14:09,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 21:14:09,122 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-18 21:14:09,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:09,123 INFO L225 Difference]: With dead ends: 46 [2020-08-18 21:14:09,123 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 21:14:09,123 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-18 21:14:09,124 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 21:14:09,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 21:14:09,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 21:14:09,128 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-18 21:14:09,128 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-18 21:14:09,129 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:09,129 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-18 21:14:09,129 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 21:14:09,129 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-18 21:14:09,129 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 21:14:09,130 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:09,130 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:09,130 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 21:14:09,130 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:09,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:09,131 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-18 21:14:09,131 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:09,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1511105808] [2020-08-18 21:14:09,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:09,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,295 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:09,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,299 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:09,299 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1511105808] [2020-08-18 21:14:09,300 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:09,300 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 21:14:09,300 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [771547449] [2020-08-18 21:14:09,301 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 21:14:09,301 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:09,301 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 21:14:09,302 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-18 21:14:09,302 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-18 21:14:09,394 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:09,394 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-18 21:14:09,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 21:14:09,395 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-18 21:14:09,395 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:09,395 INFO L225 Difference]: With dead ends: 48 [2020-08-18 21:14:09,396 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 21:14:09,396 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-18 21:14:09,397 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 21:14:09,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 21:14:09,401 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 21:14:09,401 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-18 21:14:09,401 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-18 21:14:09,402 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:09,402 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-18 21:14:09,402 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 21:14:09,402 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-18 21:14:09,403 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-18 21:14:09,403 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:09,403 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:09,403 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 21:14:09,403 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:09,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:09,404 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-18 21:14:09,404 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:09,404 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [42385870] [2020-08-18 21:14:09,404 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:09,416 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:09,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,634 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:09,635 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [42385870] [2020-08-18 21:14:09,637 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:09,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 21:14:09,638 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1927286317] [2020-08-18 21:14:09,638 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 21:14:09,638 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:09,639 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 21:14:09,639 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-18 21:14:09,639 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-18 21:14:09,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:09,729 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-18 21:14:09,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 21:14:09,730 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-18 21:14:09,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:09,731 INFO L225 Difference]: With dead ends: 50 [2020-08-18 21:14:09,731 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 21:14:09,731 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-18 21:14:09,732 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 21:14:09,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 21:14:09,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 21:14:09,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-18 21:14:09,736 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-18 21:14:09,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:09,737 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-18 21:14:09,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 21:14:09,737 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-18 21:14:09,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-18 21:14:09,738 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:09,738 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:09,738 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 21:14:09,738 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:09,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:09,739 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-18 21:14:09,739 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:09,739 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1198995638] [2020-08-18 21:14:09,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:09,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:09,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:09,952 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:09,952 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1198995638] [2020-08-18 21:14:09,953 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:09,953 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 21:14:09,953 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626940114] [2020-08-18 21:14:09,954 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 21:14:09,955 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:09,955 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 21:14:09,956 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-18 21:14:09,956 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-18 21:14:10,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:10,048 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-18 21:14:10,049 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 21:14:10,049 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-18 21:14:10,049 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:10,050 INFO L225 Difference]: With dead ends: 52 [2020-08-18 21:14:10,050 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 21:14:10,050 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-18 21:14:10,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 21:14:10,055 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 21:14:10,055 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 21:14:10,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-18 21:14:10,056 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-18 21:14:10,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:10,056 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-18 21:14:10,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 21:14:10,056 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-18 21:14:10,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 21:14:10,057 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:10,057 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:10,057 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 21:14:10,057 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:10,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:10,058 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-18 21:14:10,058 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:10,058 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [196439645] [2020-08-18 21:14:10,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:10,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,297 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:10,298 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,304 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:10,304 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [196439645] [2020-08-18 21:14:10,304 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:10,304 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 21:14:10,305 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1135865256] [2020-08-18 21:14:10,305 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 21:14:10,305 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:10,306 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 21:14:10,306 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-18 21:14:10,306 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-18 21:14:10,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:10,436 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-18 21:14:10,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 21:14:10,437 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-18 21:14:10,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:10,438 INFO L225 Difference]: With dead ends: 54 [2020-08-18 21:14:10,438 INFO L226 Difference]: Without dead ends: 48 [2020-08-18 21:14:10,439 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-18 21:14:10,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-18 21:14:10,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-18 21:14:10,444 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-18 21:14:10,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-18 21:14:10,444 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-18 21:14:10,445 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:10,445 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-18 21:14:10,445 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 21:14:10,445 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-18 21:14:10,446 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 21:14:10,446 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:10,446 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:10,446 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 21:14:10,446 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:10,447 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:10,447 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-18 21:14:10,447 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:10,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [644993757] [2020-08-18 21:14:10,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:10,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,765 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:10,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:10,770 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:10,770 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [644993757] [2020-08-18 21:14:10,771 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:10,771 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 21:14:10,771 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [599896813] [2020-08-18 21:14:10,771 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 21:14:10,772 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:10,772 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 21:14:10,772 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-18 21:14:10,772 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-18 21:14:10,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:10,865 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-18 21:14:10,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 21:14:10,865 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-18 21:14:10,866 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:10,866 INFO L225 Difference]: With dead ends: 56 [2020-08-18 21:14:10,866 INFO L226 Difference]: Without dead ends: 50 [2020-08-18 21:14:10,867 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-18 21:14:10,868 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-18 21:14:10,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-18 21:14:10,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 21:14:10,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-18 21:14:10,873 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-18 21:14:10,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:10,873 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-18 21:14:10,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 21:14:10,873 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-18 21:14:10,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 21:14:10,874 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:10,874 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:10,874 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 21:14:10,875 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:10,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:10,875 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-18 21:14:10,875 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:10,875 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [118234785] [2020-08-18 21:14:10,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:10,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:11,139 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:11,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:11,144 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:11,145 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [118234785] [2020-08-18 21:14:11,145 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:11,145 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 21:14:11,146 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [715516195] [2020-08-18 21:14:11,146 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 21:14:11,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:11,147 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 21:14:11,147 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-18 21:14:11,147 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-18 21:14:11,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:11,212 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-18 21:14:11,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 21:14:11,213 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-18 21:14:11,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:11,214 INFO L225 Difference]: With dead ends: 58 [2020-08-18 21:14:11,214 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 21:14:11,214 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-18 21:14:11,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 21:14:11,218 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 21:14:11,218 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 21:14:11,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-18 21:14:11,219 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-18 21:14:11,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:11,219 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-18 21:14:11,220 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 21:14:11,220 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-18 21:14:11,220 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 21:14:11,220 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:11,221 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:11,221 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 21:14:11,221 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:11,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:11,221 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-18 21:14:11,222 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:11,222 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [222232131] [2020-08-18 21:14:11,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:11,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:11,505 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:11,506 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:11,511 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:11,511 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [222232131] [2020-08-18 21:14:11,511 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:11,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 21:14:11,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [825151598] [2020-08-18 21:14:11,512 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 21:14:11,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:11,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 21:14:11,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-18 21:14:11,513 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-18 21:14:11,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:11,646 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-18 21:14:11,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 21:14:11,647 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-18 21:14:11,647 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:11,647 INFO L225 Difference]: With dead ends: 60 [2020-08-18 21:14:11,648 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 21:14:11,648 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-18 21:14:11,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 21:14:11,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 21:14:11,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 21:14:11,656 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-18 21:14:11,658 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-18 21:14:11,659 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:11,659 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-18 21:14:11,659 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 21:14:11,659 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-18 21:14:11,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 21:14:11,663 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:11,663 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:11,663 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 21:14:11,663 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:11,664 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:11,665 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-18 21:14:11,665 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:11,665 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [283457677] [2020-08-18 21:14:11,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:11,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:11,971 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:11,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:11,976 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:11,976 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [283457677] [2020-08-18 21:14:11,977 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:11,977 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 21:14:11,977 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309999318] [2020-08-18 21:14:11,977 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 21:14:11,978 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:11,978 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 21:14:11,978 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-18 21:14:11,978 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-18 21:14:12,055 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:12,055 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-18 21:14:12,057 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 21:14:12,057 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-18 21:14:12,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:12,058 INFO L225 Difference]: With dead ends: 62 [2020-08-18 21:14:12,058 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 21:14:12,059 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-18 21:14:12,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 21:14:12,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 21:14:12,063 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 21:14:12,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-18 21:14:12,064 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-18 21:14:12,064 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:12,064 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-18 21:14:12,064 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 21:14:12,065 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-18 21:14:12,065 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 21:14:12,065 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:12,066 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:12,066 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 21:14:12,066 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:12,066 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:12,066 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-18 21:14:12,067 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:12,067 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [380891633] [2020-08-18 21:14:12,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:12,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:12,393 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:12,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:12,399 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:12,399 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [380891633] [2020-08-18 21:14:12,399 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:12,400 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 21:14:12,400 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1640495959] [2020-08-18 21:14:12,400 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 21:14:12,400 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:12,401 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 21:14:12,401 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-18 21:14:12,401 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-18 21:14:12,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:12,510 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-18 21:14:12,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 21:14:12,510 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-18 21:14:12,510 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:12,511 INFO L225 Difference]: With dead ends: 64 [2020-08-18 21:14:12,511 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 21:14:12,512 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-18 21:14:12,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 21:14:12,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 21:14:12,515 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 21:14:12,516 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-18 21:14:12,516 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-18 21:14:12,516 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:12,517 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-18 21:14:12,517 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 21:14:12,517 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-18 21:14:12,517 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 21:14:12,517 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:12,518 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:12,518 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 21:14:12,518 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:12,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:12,518 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-18 21:14:12,519 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:12,519 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [115686166] [2020-08-18 21:14:12,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:12,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:12,861 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:12,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:12,867 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:12,868 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [115686166] [2020-08-18 21:14:12,868 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:12,868 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 21:14:12,868 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632080475] [2020-08-18 21:14:12,869 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 21:14:12,869 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:12,869 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 21:14:12,869 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-18 21:14:12,870 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-18 21:14:13,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:13,021 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-18 21:14:13,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 21:14:13,022 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-18 21:14:13,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:13,022 INFO L225 Difference]: With dead ends: 66 [2020-08-18 21:14:13,023 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 21:14:13,024 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-18 21:14:13,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 21:14:13,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 21:14:13,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 21:14:13,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-18 21:14:13,029 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-18 21:14:13,030 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:13,030 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-18 21:14:13,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 21:14:13,030 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-18 21:14:13,037 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 21:14:13,037 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:13,038 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:13,039 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 21:14:13,039 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:13,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:13,040 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-18 21:14:13,040 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:13,040 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [665665428] [2020-08-18 21:14:13,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:13,052 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:13,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:13,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:13,418 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:13,418 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [665665428] [2020-08-18 21:14:13,419 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:13,419 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 21:14:13,419 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239354523] [2020-08-18 21:14:13,419 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 21:14:13,420 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:13,420 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 21:14:13,420 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-18 21:14:13,421 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-18 21:14:13,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:13,576 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-18 21:14:13,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 21:14:13,577 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-18 21:14:13,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:13,577 INFO L225 Difference]: With dead ends: 68 [2020-08-18 21:14:13,578 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 21:14:13,578 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-18 21:14:13,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 21:14:13,581 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 21:14:13,582 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 21:14:13,582 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-18 21:14:13,583 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-18 21:14:13,583 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:13,583 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-18 21:14:13,583 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 21:14:13,583 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-18 21:14:13,584 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 21:14:13,584 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:13,584 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:13,584 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 21:14:13,584 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:13,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:13,585 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-18 21:14:13,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:13,585 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [882157104] [2020-08-18 21:14:13,585 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:13,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:13,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:13,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:13,981 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:13,981 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [882157104] [2020-08-18 21:14:13,981 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:13,982 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 21:14:13,982 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286472781] [2020-08-18 21:14:13,984 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 21:14:13,984 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:13,985 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 21:14:13,985 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-18 21:14:13,985 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-18 21:14:14,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:14,147 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-18 21:14:14,147 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 21:14:14,147 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-18 21:14:14,147 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:14,148 INFO L225 Difference]: With dead ends: 70 [2020-08-18 21:14:14,148 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 21:14:14,149 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-18 21:14:14,149 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 21:14:14,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 21:14:14,152 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 21:14:14,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-18 21:14:14,153 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-18 21:14:14,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:14,153 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-18 21:14:14,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 21:14:14,153 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-18 21:14:14,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 21:14:14,154 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:14,154 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:14,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 21:14:14,154 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:14,155 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:14,155 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-18 21:14:14,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:14,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167670696] [2020-08-18 21:14:14,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:14,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:14,583 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:14,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:14,591 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:14,591 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167670696] [2020-08-18 21:14:14,591 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:14,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 21:14:14,592 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1974807508] [2020-08-18 21:14:14,592 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 21:14:14,592 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:14,593 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 21:14:14,593 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-18 21:14:14,593 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-18 21:14:14,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:14,751 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-18 21:14:14,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 21:14:14,751 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-18 21:14:14,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:14,752 INFO L225 Difference]: With dead ends: 72 [2020-08-18 21:14:14,753 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 21:14:14,754 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-18 21:14:14,754 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 21:14:14,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 21:14:14,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 21:14:14,758 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-18 21:14:14,759 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-18 21:14:14,759 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:14,759 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-18 21:14:14,759 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 21:14:14,759 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-18 21:14:14,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 21:14:14,760 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:14,760 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:14,760 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 21:14:14,760 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:14,760 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:14,761 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-18 21:14:14,761 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:14,761 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1721356602] [2020-08-18 21:14:14,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:14,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:15,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:15,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:15,207 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:15,208 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1721356602] [2020-08-18 21:14:15,208 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:15,208 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 21:14:15,208 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1786809687] [2020-08-18 21:14:15,209 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 21:14:15,209 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:15,209 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 21:14:15,210 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-18 21:14:15,210 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-18 21:14:15,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:15,387 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-18 21:14:15,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 21:14:15,387 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-18 21:14:15,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:15,388 INFO L225 Difference]: With dead ends: 74 [2020-08-18 21:14:15,389 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 21:14:15,390 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-18 21:14:15,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 21:14:15,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 21:14:15,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 21:14:15,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-18 21:14:15,394 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-18 21:14:15,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:15,394 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-18 21:14:15,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 21:14:15,394 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-18 21:14:15,395 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 21:14:15,395 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:15,395 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:15,395 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 21:14:15,396 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:15,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:15,396 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-18 21:14:15,396 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:15,396 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1762168324] [2020-08-18 21:14:15,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:15,409 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:15,864 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:15,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:15,872 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:15,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1762168324] [2020-08-18 21:14:15,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:15,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 21:14:15,874 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [384696133] [2020-08-18 21:14:15,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 21:14:15,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:15,875 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 21:14:15,875 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-18 21:14:15,876 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-18 21:14:16,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:16,046 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-18 21:14:16,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 21:14:16,047 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-18 21:14:16,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:16,048 INFO L225 Difference]: With dead ends: 76 [2020-08-18 21:14:16,048 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 21:14:16,048 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-18 21:14:16,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 21:14:16,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 21:14:16,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 21:14:16,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-18 21:14:16,054 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-18 21:14:16,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:16,055 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-18 21:14:16,055 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 21:14:16,055 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-18 21:14:16,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 21:14:16,056 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:16,056 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:16,056 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 21:14:16,056 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:16,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:16,056 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-18 21:14:16,057 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:16,057 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [594781165] [2020-08-18 21:14:16,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:16,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:16,588 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:16,589 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:16,597 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:16,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [594781165] [2020-08-18 21:14:16,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:16,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 21:14:16,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269563033] [2020-08-18 21:14:16,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 21:14:16,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:16,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 21:14:16,602 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-18 21:14:16,602 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-18 21:14:16,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:16,777 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-18 21:14:16,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 21:14:16,778 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-18 21:14:16,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:16,779 INFO L225 Difference]: With dead ends: 78 [2020-08-18 21:14:16,779 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 21:14:16,780 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-18 21:14:16,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 21:14:16,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 21:14:16,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 21:14:16,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-18 21:14:16,785 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-18 21:14:16,786 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:16,786 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-18 21:14:16,786 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 21:14:16,786 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-18 21:14:16,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 21:14:16,787 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:16,788 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:16,788 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 21:14:16,788 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:16,788 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:16,789 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-18 21:14:16,789 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:16,789 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [900020258] [2020-08-18 21:14:16,789 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:16,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:17,436 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:17,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:17,445 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:17,446 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [900020258] [2020-08-18 21:14:17,446 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:17,446 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 21:14:17,446 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1117023770] [2020-08-18 21:14:17,447 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 21:14:17,447 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:17,447 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 21:14:17,448 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 21:14:17,448 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-18 21:14:17,622 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:17,622 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-18 21:14:17,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 21:14:17,623 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-18 21:14:17,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:17,624 INFO L225 Difference]: With dead ends: 80 [2020-08-18 21:14:17,624 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 21:14:17,625 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 21:14:17,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 21:14:17,628 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 21:14:17,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 21:14:17,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-18 21:14:17,629 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-18 21:14:17,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:17,629 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-18 21:14:17,629 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 21:14:17,629 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-18 21:14:17,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 21:14:17,630 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:17,630 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:17,631 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 21:14:17,631 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:17,631 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:17,631 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-18 21:14:17,631 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:17,632 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [97918798] [2020-08-18 21:14:17,632 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:17,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:18,198 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:18,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:18,206 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:18,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [97918798] [2020-08-18 21:14:18,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:18,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 21:14:18,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036959614] [2020-08-18 21:14:18,208 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 21:14:18,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:18,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 21:14:18,209 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 21:14:18,209 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-18 21:14:18,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:18,412 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-18 21:14:18,413 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 21:14:18,413 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-18 21:14:18,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:18,414 INFO L225 Difference]: With dead ends: 82 [2020-08-18 21:14:18,414 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 21:14:18,415 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 21:14:18,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 21:14:18,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 21:14:18,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 21:14:18,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-18 21:14:18,422 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-18 21:14:18,423 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:18,432 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-18 21:14:18,432 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 21:14:18,432 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-18 21:14:18,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 21:14:18,433 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:18,433 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:18,433 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 21:14:18,433 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:18,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:18,434 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-18 21:14:18,434 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:18,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [907930865] [2020-08-18 21:14:18,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:18,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:19,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:19,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:19,201 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:19,201 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [907930865] [2020-08-18 21:14:19,201 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:19,202 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 21:14:19,202 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1479772055] [2020-08-18 21:14:19,203 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 21:14:19,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:19,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 21:14:19,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 21:14:19,204 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-18 21:14:19,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:19,469 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-18 21:14:19,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 21:14:19,470 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-18 21:14:19,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:19,471 INFO L225 Difference]: With dead ends: 84 [2020-08-18 21:14:19,472 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 21:14:19,473 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 21:14:19,473 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 21:14:19,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 21:14:19,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 21:14:19,481 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-18 21:14:19,483 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-18 21:14:19,484 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:19,484 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-18 21:14:19,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 21:14:19,484 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-18 21:14:19,485 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 21:14:19,485 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:19,485 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:19,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 21:14:19,486 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:19,488 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:19,488 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-18 21:14:19,488 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:19,488 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [254491538] [2020-08-18 21:14:19,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:19,527 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:20,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:20,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:20,183 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:20,183 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [254491538] [2020-08-18 21:14:20,183 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:20,184 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 21:14:20,184 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1399988695] [2020-08-18 21:14:20,184 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 21:14:20,184 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:20,185 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 21:14:20,185 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 21:14:20,185 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-18 21:14:20,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:20,359 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-18 21:14:20,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 21:14:20,360 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-18 21:14:20,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:20,361 INFO L225 Difference]: With dead ends: 86 [2020-08-18 21:14:20,362 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 21:14:20,363 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 21:14:20,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 21:14:20,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 21:14:20,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 21:14:20,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-18 21:14:20,367 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-18 21:14:20,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:20,367 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-18 21:14:20,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 21:14:20,367 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-18 21:14:20,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 21:14:20,368 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:20,368 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:20,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 21:14:20,369 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:20,369 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:20,369 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-18 21:14:20,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:20,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [978441337] [2020-08-18 21:14:20,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:20,383 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:21,097 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:21,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:21,106 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:21,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [978441337] [2020-08-18 21:14:21,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:21,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 21:14:21,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [833718812] [2020-08-18 21:14:21,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 21:14:21,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:21,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 21:14:21,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 21:14:21,109 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-18 21:14:21,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:21,324 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-18 21:14:21,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 21:14:21,324 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-18 21:14:21,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:21,325 INFO L225 Difference]: With dead ends: 88 [2020-08-18 21:14:21,325 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 21:14:21,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 21:14:21,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 21:14:21,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 21:14:21,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 21:14:21,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-18 21:14:21,330 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-18 21:14:21,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:21,331 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-18 21:14:21,331 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 21:14:21,331 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-18 21:14:21,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 21:14:21,332 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:21,332 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:21,332 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 21:14:21,332 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:21,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:21,333 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-18 21:14:21,333 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:21,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1143500264] [2020-08-18 21:14:21,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:21,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:22,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:22,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:22,046 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:22,047 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1143500264] [2020-08-18 21:14:22,047 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:22,047 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 21:14:22,047 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1948715242] [2020-08-18 21:14:22,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 21:14:22,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:22,048 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 21:14:22,048 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 21:14:22,049 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-18 21:14:22,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:22,230 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-18 21:14:22,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 21:14:22,231 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-18 21:14:22,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:22,232 INFO L225 Difference]: With dead ends: 90 [2020-08-18 21:14:22,232 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 21:14:22,233 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 21:14:22,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 21:14:22,236 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 21:14:22,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 21:14:22,237 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-18 21:14:22,237 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-18 21:14:22,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:22,237 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-18 21:14:22,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 21:14:22,237 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-18 21:14:22,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 21:14:22,238 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:22,238 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:22,238 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 21:14:22,239 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:22,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:22,239 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-18 21:14:22,239 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:22,239 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2132587628] [2020-08-18 21:14:22,239 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:22,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:23,000 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:23,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:23,009 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:23,009 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2132587628] [2020-08-18 21:14:23,009 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:23,009 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 21:14:23,011 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1846682768] [2020-08-18 21:14:23,013 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 21:14:23,013 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:23,014 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 21:14:23,014 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 21:14:23,014 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-18 21:14:23,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:23,151 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-18 21:14:23,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 21:14:23,151 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-18 21:14:23,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:23,152 INFO L225 Difference]: With dead ends: 92 [2020-08-18 21:14:23,153 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 21:14:23,153 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 21:14:23,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 21:14:23,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 21:14:23,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 21:14:23,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-18 21:14:23,158 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-18 21:14:23,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:23,159 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-18 21:14:23,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 21:14:23,159 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-18 21:14:23,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 21:14:23,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:23,160 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:23,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 21:14:23,160 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:23,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:23,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-18 21:14:23,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:23,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1847292419] [2020-08-18 21:14:23,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:23,180 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:23,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:23,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:23,994 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:23,995 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1847292419] [2020-08-18 21:14:23,995 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:23,995 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 21:14:23,995 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359862187] [2020-08-18 21:14:23,996 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 21:14:23,996 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:23,996 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 21:14:23,997 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 21:14:23,997 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-18 21:14:24,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:24,223 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-18 21:14:24,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 21:14:24,224 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-18 21:14:24,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:24,225 INFO L225 Difference]: With dead ends: 94 [2020-08-18 21:14:24,225 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 21:14:24,226 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 21:14:24,226 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 21:14:24,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 21:14:24,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 21:14:24,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-18 21:14:24,230 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-18 21:14:24,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:24,231 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-18 21:14:24,231 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 21:14:24,231 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-18 21:14:24,232 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 21:14:24,232 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:24,232 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:24,232 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 21:14:24,232 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:24,233 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:24,233 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-18 21:14:24,233 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:24,233 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [758295685] [2020-08-18 21:14:24,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:24,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:25,060 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:25,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:25,070 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:25,071 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [758295685] [2020-08-18 21:14:25,071 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:25,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 21:14:25,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311428093] [2020-08-18 21:14:25,072 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 21:14:25,072 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:25,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 21:14:25,073 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 21:14:25,073 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-18 21:14:25,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:25,312 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-18 21:14:25,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 21:14:25,312 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-18 21:14:25,313 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:25,313 INFO L225 Difference]: With dead ends: 96 [2020-08-18 21:14:25,314 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 21:14:25,315 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 21:14:25,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 21:14:25,319 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 21:14:25,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 21:14:25,320 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-18 21:14:25,321 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-18 21:14:25,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:25,321 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-18 21:14:25,321 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 21:14:25,321 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-18 21:14:25,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 21:14:25,322 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:25,322 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:25,322 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 21:14:25,322 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:25,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:25,323 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-18 21:14:25,323 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:25,323 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2079003777] [2020-08-18 21:14:25,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:25,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:26,326 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:26,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:26,336 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:26,336 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2079003777] [2020-08-18 21:14:26,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:26,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 21:14:26,337 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [293659669] [2020-08-18 21:14:26,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 21:14:26,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:26,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 21:14:26,338 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 21:14:26,338 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-18 21:14:26,576 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:26,577 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-18 21:14:26,577 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 21:14:26,577 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-18 21:14:26,578 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:26,578 INFO L225 Difference]: With dead ends: 98 [2020-08-18 21:14:26,579 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 21:14:26,580 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 21:14:26,580 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 21:14:26,583 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 21:14:26,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 21:14:26,584 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-18 21:14:26,584 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-18 21:14:26,584 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:26,585 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-18 21:14:26,585 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 21:14:26,585 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-18 21:14:26,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 21:14:26,585 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:26,586 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:26,586 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 21:14:26,586 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:26,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:26,586 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-18 21:14:26,586 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:26,587 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67242453] [2020-08-18 21:14:26,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:26,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:27,485 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:27,487 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:27,497 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:27,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67242453] [2020-08-18 21:14:27,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:27,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 21:14:27,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1600746572] [2020-08-18 21:14:27,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 21:14:27,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:27,498 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 21:14:27,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 21:14:27,499 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-18 21:14:27,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:27,715 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-18 21:14:27,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 21:14:27,716 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-18 21:14:27,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:27,717 INFO L225 Difference]: With dead ends: 100 [2020-08-18 21:14:27,717 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 21:14:27,718 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 21:14:27,719 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 21:14:27,723 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 21:14:27,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 21:14:27,724 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-18 21:14:27,724 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-18 21:14:27,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:27,724 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-18 21:14:27,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 21:14:27,724 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-18 21:14:27,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 21:14:27,725 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:27,725 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:27,725 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 21:14:27,726 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:27,726 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:27,726 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-18 21:14:27,726 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:27,726 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1397283345] [2020-08-18 21:14:27,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:27,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:28,706 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:28,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:28,717 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:28,717 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1397283345] [2020-08-18 21:14:28,717 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:28,718 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 21:14:28,718 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1995854425] [2020-08-18 21:14:28,718 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 21:14:28,718 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:28,719 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 21:14:28,720 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 21:14:28,720 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-18 21:14:28,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:28,894 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-18 21:14:28,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 21:14:28,899 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-18 21:14:28,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:28,900 INFO L225 Difference]: With dead ends: 102 [2020-08-18 21:14:28,900 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 21:14:28,901 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 21:14:28,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 21:14:28,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 21:14:28,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 21:14:28,905 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-18 21:14:28,905 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-18 21:14:28,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:28,905 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-18 21:14:28,905 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 21:14:28,905 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-18 21:14:28,906 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 21:14:28,906 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:28,906 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:28,906 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 21:14:28,907 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:28,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:28,907 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-18 21:14:28,907 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:28,907 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1579622074] [2020-08-18 21:14:28,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:28,921 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:29,880 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:29,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:29,890 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:29,890 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1579622074] [2020-08-18 21:14:29,891 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:29,891 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-18 21:14:29,891 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1180578832] [2020-08-18 21:14:29,891 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-18 21:14:29,892 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:29,892 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-18 21:14:29,892 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 21:14:29,893 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-18 21:14:30,150 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:30,150 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-18 21:14:30,151 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-18 21:14:30,151 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-18 21:14:30,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:30,152 INFO L225 Difference]: With dead ends: 104 [2020-08-18 21:14:30,152 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 21:14:30,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 21:14:30,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 21:14:30,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 21:14:30,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 21:14:30,158 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-18 21:14:30,158 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-18 21:14:30,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:30,159 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-18 21:14:30,159 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-18 21:14:30,159 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-18 21:14:30,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 21:14:30,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:30,160 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:30,160 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 21:14:30,160 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:30,160 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:30,161 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-18 21:14:30,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:30,161 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [217422786] [2020-08-18 21:14:30,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:30,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:31,212 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:31,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:31,228 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:31,228 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [217422786] [2020-08-18 21:14:31,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:31,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-18 21:14:31,229 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1924498377] [2020-08-18 21:14:31,229 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-18 21:14:31,229 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:31,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-18 21:14:31,231 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 21:14:31,231 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-18 21:14:31,387 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:31,387 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-18 21:14:31,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-18 21:14:31,388 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-18 21:14:31,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:31,389 INFO L225 Difference]: With dead ends: 106 [2020-08-18 21:14:31,389 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 21:14:31,389 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 21:14:31,390 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 21:14:31,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 21:14:31,393 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 21:14:31,394 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-18 21:14:31,394 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-18 21:14:31,394 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:31,394 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-18 21:14:31,394 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-18 21:14:31,395 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-18 21:14:31,396 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 21:14:31,396 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:31,396 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:31,396 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-18 21:14:31,396 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:31,396 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:31,397 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-18 21:14:31,397 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:31,397 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [788655989] [2020-08-18 21:14:31,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:31,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:32,532 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:32,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:32,542 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:32,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [788655989] [2020-08-18 21:14:32,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:32,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-18 21:14:32,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998195837] [2020-08-18 21:14:32,543 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-18 21:14:32,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:32,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-18 21:14:32,544 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 21:14:32,544 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-18 21:14:32,801 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:32,801 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-18 21:14:32,801 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-18 21:14:32,802 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-18 21:14:32,802 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:32,803 INFO L225 Difference]: With dead ends: 108 [2020-08-18 21:14:32,803 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 21:14:32,803 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 21:14:32,804 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 21:14:32,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 21:14:32,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 21:14:32,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-18 21:14:32,808 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-18 21:14:32,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:32,808 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-18 21:14:32,808 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-18 21:14:32,808 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-18 21:14:32,809 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 21:14:32,809 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:32,809 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:32,809 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-18 21:14:32,809 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:32,810 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:32,810 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-18 21:14:32,810 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:32,810 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1127804700] [2020-08-18 21:14:32,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:32,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:33,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:33,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:33,963 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:33,963 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1127804700] [2020-08-18 21:14:33,963 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:33,964 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-18 21:14:33,964 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1971808834] [2020-08-18 21:14:33,964 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-18 21:14:33,964 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:33,964 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-18 21:14:33,965 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 21:14:33,965 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-18 21:14:34,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:34,163 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-18 21:14:34,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-18 21:14:34,163 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-18 21:14:34,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:34,164 INFO L225 Difference]: With dead ends: 110 [2020-08-18 21:14:34,164 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 21:14:34,165 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-18 21:14:34,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 21:14:34,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 21:14:34,168 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 21:14:34,169 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-18 21:14:34,169 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-18 21:14:34,169 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:34,169 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-18 21:14:34,169 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-18 21:14:34,169 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-18 21:14:34,170 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 21:14:34,170 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:34,170 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:34,170 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-18 21:14:34,170 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:34,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:34,171 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-18 21:14:34,171 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:34,171 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1359751952] [2020-08-18 21:14:34,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:34,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:35,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:35,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:35,341 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:35,342 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1359751952] [2020-08-18 21:14:35,342 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:35,342 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-18 21:14:35,342 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136407777] [2020-08-18 21:14:35,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-18 21:14:35,343 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:35,343 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-18 21:14:35,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 21:14:35,343 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-18 21:14:35,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:35,528 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-18 21:14:35,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-18 21:14:35,529 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-18 21:14:35,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:35,530 INFO L225 Difference]: With dead ends: 112 [2020-08-18 21:14:35,530 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 21:14:35,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-18 21:14:35,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 21:14:35,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 21:14:35,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 21:14:35,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-18 21:14:35,535 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-18 21:14:35,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:35,535 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-18 21:14:35,535 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-18 21:14:35,535 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-18 21:14:35,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-18 21:14:35,536 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:35,536 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:35,536 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-18 21:14:35,536 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:35,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:35,537 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-18 21:14:35,537 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:35,537 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649945886] [2020-08-18 21:14:35,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:35,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:36,781 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:36,782 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:36,792 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:36,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1649945886] [2020-08-18 21:14:36,793 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:36,793 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-18 21:14:36,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230414571] [2020-08-18 21:14:36,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-18 21:14:36,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:36,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-18 21:14:36,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 21:14:36,794 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-18 21:14:36,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:36,963 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-18 21:14:36,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-18 21:14:36,964 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-18 21:14:36,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:36,965 INFO L225 Difference]: With dead ends: 114 [2020-08-18 21:14:36,965 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 21:14:36,966 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-18 21:14:36,966 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 21:14:36,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 21:14:36,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 21:14:36,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-18 21:14:36,970 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-18 21:14:36,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:36,971 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-18 21:14:36,971 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-18 21:14:36,971 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-18 21:14:36,971 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-18 21:14:36,971 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:36,972 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:36,972 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-18 21:14:36,972 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:36,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:36,972 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-18 21:14:36,972 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:36,973 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1306890388] [2020-08-18 21:14:36,973 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:36,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:38,255 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:38,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:38,267 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:38,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1306890388] [2020-08-18 21:14:38,268 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:38,268 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-18 21:14:38,268 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1410515028] [2020-08-18 21:14:38,268 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-18 21:14:38,268 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:38,269 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-18 21:14:38,269 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-18 21:14:38,269 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-18 21:14:38,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:38,442 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-18 21:14:38,442 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-18 21:14:38,443 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-18 21:14:38,443 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:38,444 INFO L225 Difference]: With dead ends: 116 [2020-08-18 21:14:38,444 INFO L226 Difference]: Without dead ends: 110 [2020-08-18 21:14:38,444 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-18 21:14:38,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-18 21:14:38,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-18 21:14:38,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 21:14:38,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-18 21:14:38,449 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-18 21:14:38,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:38,450 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-18 21:14:38,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-18 21:14:38,450 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-18 21:14:38,450 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-18 21:14:38,450 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:38,451 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:38,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-18 21:14:38,451 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:38,452 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:38,452 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-18 21:14:38,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:38,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1898246183] [2020-08-18 21:14:38,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:38,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:39,836 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:39,837 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:39,848 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:39,848 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1898246183] [2020-08-18 21:14:39,848 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:39,848 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-18 21:14:39,848 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162404407] [2020-08-18 21:14:39,848 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-18 21:14:39,849 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:39,849 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-18 21:14:39,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-18 21:14:39,849 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-18 21:14:40,063 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:40,064 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-18 21:14:40,064 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-18 21:14:40,064 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-18 21:14:40,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:40,066 INFO L225 Difference]: With dead ends: 118 [2020-08-18 21:14:40,066 INFO L226 Difference]: Without dead ends: 112 [2020-08-18 21:14:40,066 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 48 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-18 21:14:40,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-18 21:14:40,070 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-18 21:14:40,070 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-18 21:14:40,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-18 21:14:40,071 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-18 21:14:40,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:40,071 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-18 21:14:40,071 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-18 21:14:40,071 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-18 21:14:40,072 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-18 21:14:40,072 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:40,072 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:40,072 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-18 21:14:40,072 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:40,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:40,073 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-18 21:14:40,073 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:40,073 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [931731848] [2020-08-18 21:14:40,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:40,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:41,530 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:41,532 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:41,543 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:41,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [931731848] [2020-08-18 21:14:41,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:41,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-18 21:14:41,543 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [512705208] [2020-08-18 21:14:41,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-18 21:14:41,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:41,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-18 21:14:41,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-18 21:14:41,545 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-18 21:14:41,805 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:41,805 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-18 21:14:41,806 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-18 21:14:41,806 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-18 21:14:41,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:41,810 INFO L225 Difference]: With dead ends: 120 [2020-08-18 21:14:41,810 INFO L226 Difference]: Without dead ends: 114 [2020-08-18 21:14:41,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 49 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-18 21:14:41,811 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-18 21:14:41,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-18 21:14:41,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-18 21:14:41,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-18 21:14:41,816 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-18 21:14:41,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:41,816 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-18 21:14:41,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-18 21:14:41,817 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-18 21:14:41,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-18 21:14:41,818 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:41,818 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:41,818 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-18 21:14:41,818 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:41,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:41,819 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-18 21:14:41,819 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:41,819 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1242122545] [2020-08-18 21:14:41,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:41,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:43,277 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:43,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:43,290 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:43,290 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1242122545] [2020-08-18 21:14:43,290 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:43,290 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-18 21:14:43,290 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1308649782] [2020-08-18 21:14:43,291 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-18 21:14:43,291 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:43,291 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-18 21:14:43,292 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-18 21:14:43,292 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-18 21:14:43,613 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:43,613 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-18 21:14:43,614 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-18 21:14:43,614 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-18 21:14:43,614 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:43,615 INFO L225 Difference]: With dead ends: 122 [2020-08-18 21:14:43,615 INFO L226 Difference]: Without dead ends: 116 [2020-08-18 21:14:43,616 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-18 21:14:43,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-18 21:14:43,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-18 21:14:43,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-18 21:14:43,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-18 21:14:43,620 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-18 21:14:43,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:43,620 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-18 21:14:43,620 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-18 21:14:43,620 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-18 21:14:43,621 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-18 21:14:43,621 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:43,621 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:43,621 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-18 21:14:43,622 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:43,622 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:43,622 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-18 21:14:43,622 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:43,623 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [74328329] [2020-08-18 21:14:43,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:43,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:45,156 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:45,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:45,169 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:45,169 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [74328329] [2020-08-18 21:14:45,169 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:45,170 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-18 21:14:45,170 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2032132245] [2020-08-18 21:14:45,170 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-18 21:14:45,170 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:45,171 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-18 21:14:45,171 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-18 21:14:45,172 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-18 21:14:45,511 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:45,511 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-18 21:14:45,511 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-18 21:14:45,512 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-18 21:14:45,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:45,513 INFO L225 Difference]: With dead ends: 124 [2020-08-18 21:14:45,513 INFO L226 Difference]: Without dead ends: 118 [2020-08-18 21:14:45,514 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-18 21:14:45,515 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-18 21:14:45,518 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-18 21:14:45,518 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-18 21:14:45,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-18 21:14:45,519 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-18 21:14:45,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:45,519 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-18 21:14:45,519 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-18 21:14:45,519 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-18 21:14:45,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-18 21:14:45,520 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:45,520 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:45,520 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-18 21:14:45,520 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:45,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:45,521 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-18 21:14:45,521 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:45,521 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1943917314] [2020-08-18 21:14:45,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:45,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:47,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:47,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:47,095 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:47,095 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1943917314] [2020-08-18 21:14:47,095 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:47,095 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-18 21:14:47,095 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421054320] [2020-08-18 21:14:47,096 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-18 21:14:47,096 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:47,096 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-18 21:14:47,096 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-18 21:14:47,096 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-18 21:14:47,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:47,449 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-18 21:14:47,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-18 21:14:47,450 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-18 21:14:47,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:47,451 INFO L225 Difference]: With dead ends: 126 [2020-08-18 21:14:47,451 INFO L226 Difference]: Without dead ends: 120 [2020-08-18 21:14:47,451 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-18 21:14:47,452 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-18 21:14:47,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-18 21:14:47,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-18 21:14:47,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-18 21:14:47,456 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-18 21:14:47,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:47,456 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-18 21:14:47,456 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-18 21:14:47,456 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-18 21:14:47,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-18 21:14:47,457 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:47,457 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:47,457 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-18 21:14:47,458 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:47,458 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:47,458 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-18 21:14:47,458 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:47,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1175979733] [2020-08-18 21:14:47,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:47,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:49,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:49,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:49,147 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:49,148 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1175979733] [2020-08-18 21:14:49,148 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:49,148 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-18 21:14:49,148 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893374236] [2020-08-18 21:14:49,148 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-18 21:14:49,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:49,149 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-18 21:14:49,149 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-18 21:14:49,149 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-18 21:14:49,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:49,406 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-18 21:14:49,406 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-18 21:14:49,406 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-18 21:14:49,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:49,408 INFO L225 Difference]: With dead ends: 128 [2020-08-18 21:14:49,408 INFO L226 Difference]: Without dead ends: 122 [2020-08-18 21:14:49,408 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 53 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-18 21:14:49,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-18 21:14:49,412 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-18 21:14:49,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-18 21:14:49,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-18 21:14:49,413 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-18 21:14:49,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:49,413 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-18 21:14:49,413 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-18 21:14:49,413 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-18 21:14:49,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-18 21:14:49,414 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:49,414 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:49,414 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-18 21:14:49,414 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:49,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:49,415 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-18 21:14:49,415 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:49,415 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [114746675] [2020-08-18 21:14:49,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:49,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:51,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:51,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:51,146 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:51,147 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [114746675] [2020-08-18 21:14:51,147 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:51,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-18 21:14:51,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1795170999] [2020-08-18 21:14:51,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-18 21:14:51,148 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:51,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-18 21:14:51,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-18 21:14:51,148 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-18 21:14:51,490 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:51,491 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-18 21:14:51,492 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-18 21:14:51,492 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-18 21:14:51,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:51,494 INFO L225 Difference]: With dead ends: 130 [2020-08-18 21:14:51,494 INFO L226 Difference]: Without dead ends: 124 [2020-08-18 21:14:51,494 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-18 21:14:51,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-18 21:14:51,498 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-18 21:14:51,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-18 21:14:51,499 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-18 21:14:51,499 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-18 21:14:51,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:51,499 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-18 21:14:51,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-18 21:14:51,499 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-18 21:14:51,500 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-18 21:14:51,500 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:51,500 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:51,500 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-18 21:14:51,501 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:51,501 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:51,502 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-18 21:14:51,502 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:51,502 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [105266177] [2020-08-18 21:14:51,502 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:51,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:53,292 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:53,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:53,307 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:53,307 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [105266177] [2020-08-18 21:14:53,308 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:53,308 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-18 21:14:53,308 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [216534719] [2020-08-18 21:14:53,308 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-18 21:14:53,309 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:53,309 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-18 21:14:53,309 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-18 21:14:53,309 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-18 21:14:53,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:53,529 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-18 21:14:53,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-18 21:14:53,529 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-18 21:14:53,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:53,530 INFO L225 Difference]: With dead ends: 132 [2020-08-18 21:14:53,531 INFO L226 Difference]: Without dead ends: 126 [2020-08-18 21:14:53,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-18 21:14:53,532 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-18 21:14:53,535 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-18 21:14:53,535 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-18 21:14:53,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-18 21:14:53,535 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-18 21:14:53,536 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:53,536 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-18 21:14:53,536 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-18 21:14:53,536 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-18 21:14:53,536 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-18 21:14:53,537 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:53,537 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:53,537 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-18 21:14:53,537 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:53,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:53,537 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-18 21:14:53,538 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:53,538 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [178172694] [2020-08-18 21:14:53,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:53,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:55,319 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:55,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:55,333 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:55,334 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [178172694] [2020-08-18 21:14:55,334 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:55,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-18 21:14:55,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1102437297] [2020-08-18 21:14:55,335 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-18 21:14:55,335 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:55,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-18 21:14:55,336 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-18 21:14:55,336 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-18 21:14:55,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:55,698 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-18 21:14:55,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-18 21:14:55,698 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-18 21:14:55,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:55,699 INFO L225 Difference]: With dead ends: 134 [2020-08-18 21:14:55,700 INFO L226 Difference]: Without dead ends: 128 [2020-08-18 21:14:55,700 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-18 21:14:55,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-18 21:14:55,703 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-18 21:14:55,704 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-18 21:14:55,704 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-18 21:14:55,704 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-18 21:14:55,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:55,705 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-18 21:14:55,705 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-18 21:14:55,705 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-18 21:14:55,706 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-18 21:14:55,706 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:55,706 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:55,706 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-18 21:14:55,706 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:55,706 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:55,706 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-18 21:14:55,707 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:55,707 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1234151580] [2020-08-18 21:14:55,707 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:55,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:57,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:57,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:57,592 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:57,593 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1234151580] [2020-08-18 21:14:57,593 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:57,593 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-18 21:14:57,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1084584880] [2020-08-18 21:14:57,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-18 21:14:57,594 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:57,594 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-18 21:14:57,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-18 21:14:57,595 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 61 states. [2020-08-18 21:14:57,835 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:57,835 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2020-08-18 21:14:57,835 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-18 21:14:57,836 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 126 [2020-08-18 21:14:57,836 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:57,837 INFO L225 Difference]: With dead ends: 136 [2020-08-18 21:14:57,837 INFO L226 Difference]: Without dead ends: 130 [2020-08-18 21:14:57,837 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-18 21:14:57,838 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-18 21:14:57,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2020-08-18 21:14:57,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-08-18 21:14:57,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2020-08-18 21:14:57,843 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2020-08-18 21:14:57,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:57,843 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2020-08-18 21:14:57,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-18 21:14:57,843 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2020-08-18 21:14:57,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-18 21:14:57,846 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:57,846 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:14:57,846 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-18 21:14:57,846 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:57,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:57,847 INFO L82 PathProgramCache]: Analyzing trace with hash -1690804143, now seen corresponding path program 58 times [2020-08-18 21:14:57,847 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:57,847 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1557918768] [2020-08-18 21:14:57,847 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:57,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:59,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:59,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:59,804 INFO L134 CoverageAnalysis]: Checked inductivity of 3364 backedges. 0 proven. 3364 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:14:59,805 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1557918768] [2020-08-18 21:14:59,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:59,805 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62] total 62 [2020-08-18 21:14:59,805 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1252087693] [2020-08-18 21:14:59,805 INFO L459 AbstractCegarLoop]: Interpolant automaton has 62 states [2020-08-18 21:14:59,805 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:59,806 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2020-08-18 21:14:59,806 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2020-08-18 21:14:59,806 INFO L87 Difference]: Start difference. First operand 129 states and 129 transitions. Second operand 62 states. [2020-08-18 21:15:00,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:15:00,163 INFO L93 Difference]: Finished difference Result 138 states and 138 transitions. [2020-08-18 21:15:00,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 62 states. [2020-08-18 21:15:00,164 INFO L78 Accepts]: Start accepts. Automaton has 62 states. Word has length 128 [2020-08-18 21:15:00,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:15:00,165 INFO L225 Difference]: With dead ends: 138 [2020-08-18 21:15:00,165 INFO L226 Difference]: Without dead ends: 132 [2020-08-18 21:15:00,166 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1832, Invalid=1950, Unknown=0, NotChecked=0, Total=3782 [2020-08-18 21:15:00,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2020-08-18 21:15:00,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 131. [2020-08-18 21:15:00,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 131 states. [2020-08-18 21:15:00,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 131 transitions. [2020-08-18 21:15:00,171 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 131 transitions. Word has length 128 [2020-08-18 21:15:00,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:15:00,171 INFO L479 AbstractCegarLoop]: Abstraction has 131 states and 131 transitions. [2020-08-18 21:15:00,171 INFO L480 AbstractCegarLoop]: Interpolant automaton has 62 states. [2020-08-18 21:15:00,171 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 131 transitions. [2020-08-18 21:15:00,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2020-08-18 21:15:00,172 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:15:00,172 INFO L422 BasicCegarLoop]: trace histogram [59, 59, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 21:15:00,172 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable59 [2020-08-18 21:15:00,173 INFO L427 AbstractCegarLoop]: === Iteration 61 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:15:00,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:15:00,173 INFO L82 PathProgramCache]: Analyzing trace with hash 2089102067, now seen corresponding path program 59 times [2020-08-18 21:15:00,173 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:15:00,173 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [836747452] [2020-08-18 21:15:00,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:15:00,192 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat