/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5000 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST --traceabstraction.additional.smt.options log-additional-information=true -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 0.1.25-177f698 [2020-08-21 20:41:20,782 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 20:41:20,785 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 20:41:20,829 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 20:41:20,829 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 20:41:20,839 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 20:41:20,842 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 20:41:20,846 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 20:41:20,848 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 20:41:20,853 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 20:41:20,854 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 20:41:20,855 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 20:41:20,855 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 20:41:20,859 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 20:41:20,862 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 20:41:20,864 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 20:41:20,867 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 20:41:20,870 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 20:41:20,871 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 20:41:20,880 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 20:41:20,882 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 20:41:20,883 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 20:41:20,884 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 20:41:20,885 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 20:41:20,897 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 20:41:20,917 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 20:41:20,918 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 20:41:20,919 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 20:41:20,920 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 20:41:20,951 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 20:41:20,951 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 20:41:20,953 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 20:41:20,953 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 20:41:20,953 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 20:41:20,954 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 20:41:20,954 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 20:41:20,954 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 20:41:20,954 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 20:41:20,954 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 20:41:20,955 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 20:41:20,956 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 20:41:20,956 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 20:41:20,956 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 20:41:20,957 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 20:41:20,957 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 20:41:20,957 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 20:41:20,957 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 20:41:20,957 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 20:41:20,958 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 20:41:20,958 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 20:41:20,958 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:41:20,958 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 20:41:20,959 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 20:41:20,959 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 20:41:20,959 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 20:41:20,959 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 20:41:20,959 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 20:41:20,960 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 20:41:20,960 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=DEEPEST;log-additional-information=true; [2020-08-21 20:41:21,265 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 20:41:21,277 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 20:41:21,281 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 20:41:21,282 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 20:41:21,283 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 20:41:21,284 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-21 20:41:21,359 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c1887ed94/24088db4dafd476082f841545b0ca04a/FLAG6bae92e5c [2020-08-21 20:41:21,819 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 20:41:21,819 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-acceleration/array_1-2.c [2020-08-21 20:41:21,826 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c1887ed94/24088db4dafd476082f841545b0ca04a/FLAG6bae92e5c [2020-08-21 20:41:22,191 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/c1887ed94/24088db4dafd476082f841545b0ca04a [2020-08-21 20:41:22,200 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 20:41:22,201 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 20:41:22,202 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 20:41:22,203 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 20:41:22,207 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 20:41:22,208 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:41:22" (1/1) ... [2020-08-21 20:41:22,211 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75e37eeb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:22, skipping insertion in model container [2020-08-21 20:41:22,211 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 08:41:22" (1/1) ... [2020-08-21 20:41:22,219 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 20:41:22,239 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 20:41:22,458 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:41:22,462 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 20:41:22,478 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 20:41:22,495 INFO L208 MainTranslator]: Completed translation [2020-08-21 20:41:22,495 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:22 WrapperNode [2020-08-21 20:41:22,495 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 20:41:22,496 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 20:41:22,496 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 20:41:22,496 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 20:41:22,591 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:22" (1/1) ... [2020-08-21 20:41:22,591 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:22" (1/1) ... [2020-08-21 20:41:22,598 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:22" (1/1) ... [2020-08-21 20:41:22,598 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:22" (1/1) ... [2020-08-21 20:41:22,604 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:22" (1/1) ... [2020-08-21 20:41:22,608 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:22" (1/1) ... [2020-08-21 20:41:22,609 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:22" (1/1) ... [2020-08-21 20:41:22,611 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 20:41:22,611 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 20:41:22,612 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 20:41:22,612 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 20:41:22,613 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:22" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 20:41:22,669 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 20:41:22,670 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 20:41:22,670 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 20:41:22,670 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 20:41:22,670 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 20:41:22,670 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 20:41:22,670 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 20:41:22,671 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 20:41:22,671 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-08-21 20:41:22,671 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-08-21 20:41:22,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 20:41:22,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 20:41:22,671 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 20:41:22,929 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 20:41:22,929 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 20:41:22,933 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:41:22 BoogieIcfgContainer [2020-08-21 20:41:22,933 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 20:41:22,935 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 20:41:22,935 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 20:41:22,938 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 20:41:22,938 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 08:41:22" (1/3) ... [2020-08-21 20:41:22,939 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51c38cd1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:41:22, skipping insertion in model container [2020-08-21 20:41:22,939 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 08:41:22" (2/3) ... [2020-08-21 20:41:22,940 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51c38cd1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 08:41:22, skipping insertion in model container [2020-08-21 20:41:22,940 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 08:41:22" (3/3) ... [2020-08-21 20:41:22,942 INFO L109 eAbstractionObserver]: Analyzing ICFG array_1-2.c [2020-08-21 20:41:22,954 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 20:41:22,963 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 20:41:22,978 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 20:41:23,004 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 20:41:23,004 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 20:41:23,004 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 20:41:23,004 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 20:41:23,005 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 20:41:23,005 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 20:41:23,005 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 20:41:23,005 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 20:41:23,042 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-21 20:41:23,054 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 20:41:23,054 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:23,062 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:23,062 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:23,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:23,073 INFO L82 PathProgramCache]: Analyzing trace with hash -267856937, now seen corresponding path program 1 times [2020-08-21 20:41:23,083 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:23,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1411056499] [2020-08-21 20:41:23,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:23,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:23,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:23,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:23,272 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:23,273 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1411056499] [2020-08-21 20:41:23,275 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:41:23,276 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 20:41:23,276 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421059382] [2020-08-21 20:41:23,281 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 20:41:23,282 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:23,293 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 20:41:23,294 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:41:23,296 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 3 states. [2020-08-21 20:41:23,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:23,373 INFO L93 Difference]: Finished difference Result 34 states and 37 transitions. [2020-08-21 20:41:23,374 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 20:41:23,375 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 12 [2020-08-21 20:41:23,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:23,383 INFO L225 Difference]: With dead ends: 34 [2020-08-21 20:41:23,383 INFO L226 Difference]: Without dead ends: 14 [2020-08-21 20:41:23,387 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 20:41:23,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-21 20:41:23,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-21 20:41:23,427 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-21 20:41:23,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 14 transitions. [2020-08-21 20:41:23,429 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 14 transitions. Word has length 12 [2020-08-21 20:41:23,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:23,430 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 14 transitions. [2020-08-21 20:41:23,430 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 20:41:23,431 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 14 transitions. [2020-08-21 20:41:23,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 20:41:23,431 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:23,432 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:23,432 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 20:41:23,432 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:23,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:23,433 INFO L82 PathProgramCache]: Analyzing trace with hash -439631843, now seen corresponding path program 1 times [2020-08-21 20:41:23,433 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:23,434 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [302076024] [2020-08-21 20:41:23,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:23,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:23,508 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:23,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:23,518 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:23,518 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [302076024] [2020-08-21 20:41:23,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 20:41:23,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 20:41:23,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1309447962] [2020-08-21 20:41:23,521 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 20:41:23,521 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:23,522 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 20:41:23,522 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 20:41:23,522 INFO L87 Difference]: Start difference. First operand 14 states and 14 transitions. Second operand 4 states. [2020-08-21 20:41:23,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:23,583 INFO L93 Difference]: Finished difference Result 22 states and 22 transitions. [2020-08-21 20:41:23,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 20:41:23,584 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 12 [2020-08-21 20:41:23,584 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:23,585 INFO L225 Difference]: With dead ends: 22 [2020-08-21 20:41:23,585 INFO L226 Difference]: Without dead ends: 16 [2020-08-21 20:41:23,587 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 [2020-08-21 20:41:23,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-21 20:41:23,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2020-08-21 20:41:23,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 20:41:23,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-08-21 20:41:23,593 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 12 [2020-08-21 20:41:23,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:23,593 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-08-21 20:41:23,594 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 20:41:23,594 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-08-21 20:41:23,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-21 20:41:23,595 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:23,595 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:23,595 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 20:41:23,595 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:23,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:23,596 INFO L82 PathProgramCache]: Analyzing trace with hash 1874839487, now seen corresponding path program 1 times [2020-08-21 20:41:23,596 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:23,597 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1535542197] [2020-08-21 20:41:23,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:23,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:23,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:23,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:23,661 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:23,661 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1535542197] [2020-08-21 20:41:23,662 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:23,662 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-21 20:41:23,662 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [213162584] [2020-08-21 20:41:23,663 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 20:41:23,663 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:23,663 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 20:41:23,664 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-21 20:41:23,664 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 5 states. [2020-08-21 20:41:23,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:23,715 INFO L93 Difference]: Finished difference Result 24 states and 24 transitions. [2020-08-21 20:41:23,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 20:41:23,716 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 14 [2020-08-21 20:41:23,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:23,717 INFO L225 Difference]: With dead ends: 24 [2020-08-21 20:41:23,717 INFO L226 Difference]: Without dead ends: 18 [2020-08-21 20:41:23,718 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 [2020-08-21 20:41:23,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-21 20:41:23,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 17. [2020-08-21 20:41:23,723 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 20:41:23,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 20:41:23,724 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 14 [2020-08-21 20:41:23,724 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:23,724 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 20:41:23,724 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 20:41:23,725 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 20:41:23,725 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 20:41:23,725 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:23,726 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:23,726 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 20:41:23,726 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:23,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:23,727 INFO L82 PathProgramCache]: Analyzing trace with hash 1288728289, now seen corresponding path program 2 times [2020-08-21 20:41:23,727 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:23,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184286891] [2020-08-21 20:41:23,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:23,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:23,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:23,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:23,808 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:23,808 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184286891] [2020-08-21 20:41:23,809 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:23,809 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 20:41:23,809 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2103688692] [2020-08-21 20:41:23,810 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 20:41:23,810 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:23,810 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 20:41:23,811 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2020-08-21 20:41:23,811 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 6 states. [2020-08-21 20:41:23,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:23,864 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 20:41:23,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 20:41:23,865 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-21 20:41:23,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:23,866 INFO L225 Difference]: With dead ends: 26 [2020-08-21 20:41:23,866 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 20:41:23,867 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 [2020-08-21 20:41:23,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 20:41:23,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2020-08-21 20:41:23,871 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-21 20:41:23,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 19 transitions. [2020-08-21 20:41:23,872 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 19 transitions. Word has length 16 [2020-08-21 20:41:23,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:23,873 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 19 transitions. [2020-08-21 20:41:23,873 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 20:41:23,873 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 19 transitions. [2020-08-21 20:41:23,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-21 20:41:23,874 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:23,874 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:23,875 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 20:41:23,875 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:23,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:23,876 INFO L82 PathProgramCache]: Analyzing trace with hash 676582787, now seen corresponding path program 3 times [2020-08-21 20:41:23,876 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:23,876 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1984074262] [2020-08-21 20:41:23,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:23,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:23,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:23,974 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:23,979 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:23,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1984074262] [2020-08-21 20:41:23,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:23,980 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 20:41:23,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235787680] [2020-08-21 20:41:23,981 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 20:41:23,981 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:23,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 20:41:23,982 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2020-08-21 20:41:23,982 INFO L87 Difference]: Start difference. First operand 19 states and 19 transitions. Second operand 7 states. [2020-08-21 20:41:24,045 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:24,046 INFO L93 Difference]: Finished difference Result 28 states and 28 transitions. [2020-08-21 20:41:24,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 20:41:24,047 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 18 [2020-08-21 20:41:24,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:24,048 INFO L225 Difference]: With dead ends: 28 [2020-08-21 20:41:24,048 INFO L226 Difference]: Without dead ends: 22 [2020-08-21 20:41:24,049 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 [2020-08-21 20:41:24,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2020-08-21 20:41:24,053 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2020-08-21 20:41:24,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-21 20:41:24,055 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-08-21 20:41:24,055 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 18 [2020-08-21 20:41:24,055 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:24,055 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-08-21 20:41:24,056 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 20:41:24,056 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-08-21 20:41:24,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 20:41:24,057 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:24,057 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:24,058 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 20:41:24,058 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:24,058 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:24,058 INFO L82 PathProgramCache]: Analyzing trace with hash 815274917, now seen corresponding path program 4 times [2020-08-21 20:41:24,059 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:24,059 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [546896471] [2020-08-21 20:41:24,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:24,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:24,153 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:24,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:24,158 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:24,158 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [546896471] [2020-08-21 20:41:24,159 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:24,159 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 20:41:24,159 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708628623] [2020-08-21 20:41:24,160 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 20:41:24,160 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:24,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 20:41:24,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2020-08-21 20:41:24,161 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 8 states. [2020-08-21 20:41:24,224 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:24,225 INFO L93 Difference]: Finished difference Result 30 states and 30 transitions. [2020-08-21 20:41:24,225 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 20:41:24,226 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 20 [2020-08-21 20:41:24,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:24,227 INFO L225 Difference]: With dead ends: 30 [2020-08-21 20:41:24,227 INFO L226 Difference]: Without dead ends: 24 [2020-08-21 20:41:24,228 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 [2020-08-21 20:41:24,228 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2020-08-21 20:41:24,232 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 23. [2020-08-21 20:41:24,232 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 20:41:24,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 20:41:24,234 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 20 [2020-08-21 20:41:24,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:24,234 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 20:41:24,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 20:41:24,234 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 20:41:24,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 20:41:24,235 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:24,235 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:24,235 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 20:41:24,236 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:24,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:24,236 INFO L82 PathProgramCache]: Analyzing trace with hash 954425671, now seen corresponding path program 5 times [2020-08-21 20:41:24,236 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:24,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2090004590] [2020-08-21 20:41:24,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:24,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:24,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:24,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:24,348 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:24,348 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2090004590] [2020-08-21 20:41:24,348 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:24,351 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 20:41:24,351 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1443483946] [2020-08-21 20:41:24,352 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 20:41:24,352 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:24,352 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 20:41:24,353 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=42, Unknown=0, NotChecked=0, Total=72 [2020-08-21 20:41:24,353 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 9 states. [2020-08-21 20:41:24,429 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:24,429 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 20:41:24,429 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 20:41:24,430 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 22 [2020-08-21 20:41:24,430 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:24,431 INFO L225 Difference]: With dead ends: 32 [2020-08-21 20:41:24,431 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 20:41:24,431 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 [2020-08-21 20:41:24,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 20:41:24,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 25. [2020-08-21 20:41:24,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-21 20:41:24,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 25 transitions. [2020-08-21 20:41:24,441 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 25 transitions. Word has length 22 [2020-08-21 20:41:24,442 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:24,442 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 25 transitions. [2020-08-21 20:41:24,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 20:41:24,443 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 25 transitions. [2020-08-21 20:41:24,445 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 20:41:24,445 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:24,445 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:24,445 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 20:41:24,445 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:24,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:24,446 INFO L82 PathProgramCache]: Analyzing trace with hash 1534314089, now seen corresponding path program 6 times [2020-08-21 20:41:24,446 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:24,447 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [443087527] [2020-08-21 20:41:24,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:24,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:24,592 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:24,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:24,597 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:24,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [443087527] [2020-08-21 20:41:24,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:24,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 20:41:24,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1597119665] [2020-08-21 20:41:24,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 20:41:24,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:24,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 20:41:24,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=52, Unknown=0, NotChecked=0, Total=90 [2020-08-21 20:41:24,600 INFO L87 Difference]: Start difference. First operand 25 states and 25 transitions. Second operand 10 states. [2020-08-21 20:41:24,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:24,666 INFO L93 Difference]: Finished difference Result 34 states and 34 transitions. [2020-08-21 20:41:24,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 20:41:24,667 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 24 [2020-08-21 20:41:24,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:24,668 INFO L225 Difference]: With dead ends: 34 [2020-08-21 20:41:24,668 INFO L226 Difference]: Without dead ends: 28 [2020-08-21 20:41:24,669 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 [2020-08-21 20:41:24,669 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2020-08-21 20:41:24,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 27. [2020-08-21 20:41:24,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 27 states. [2020-08-21 20:41:24,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2020-08-21 20:41:24,674 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 24 [2020-08-21 20:41:24,675 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:24,675 INFO L479 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2020-08-21 20:41:24,675 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 20:41:24,675 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2020-08-21 20:41:24,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 20:41:24,676 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:24,676 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:24,676 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 20:41:24,676 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:24,677 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:24,677 INFO L82 PathProgramCache]: Analyzing trace with hash 461335307, now seen corresponding path program 7 times [2020-08-21 20:41:24,677 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:24,677 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2040368253] [2020-08-21 20:41:24,678 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:24,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:24,768 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:24,770 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:24,773 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:24,774 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2040368253] [2020-08-21 20:41:24,774 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:24,774 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 20:41:24,774 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1390434665] [2020-08-21 20:41:24,775 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 20:41:24,775 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:24,775 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 20:41:24,776 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=63, Unknown=0, NotChecked=0, Total=110 [2020-08-21 20:41:24,776 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand 11 states. [2020-08-21 20:41:24,849 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:24,849 INFO L93 Difference]: Finished difference Result 36 states and 36 transitions. [2020-08-21 20:41:24,849 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 20:41:24,850 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 26 [2020-08-21 20:41:24,850 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:24,850 INFO L225 Difference]: With dead ends: 36 [2020-08-21 20:41:24,851 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 20:41:24,851 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 [2020-08-21 20:41:24,852 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 20:41:24,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 20:41:24,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 20:41:24,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 20:41:24,857 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 26 [2020-08-21 20:41:24,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:24,857 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 20:41:24,857 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 20:41:24,858 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 20:41:24,858 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 20:41:24,858 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:24,859 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:24,859 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 20:41:24,859 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:24,859 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:24,860 INFO L82 PathProgramCache]: Analyzing trace with hash 120876845, now seen corresponding path program 8 times [2020-08-21 20:41:24,860 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:24,860 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [920813749] [2020-08-21 20:41:24,860 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:24,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:24,979 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:24,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:24,985 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:24,985 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [920813749] [2020-08-21 20:41:24,986 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:24,986 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 20:41:24,986 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425691781] [2020-08-21 20:41:24,987 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 20:41:24,987 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:24,987 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 20:41:24,988 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=75, Unknown=0, NotChecked=0, Total=132 [2020-08-21 20:41:24,988 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 12 states. [2020-08-21 20:41:25,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:25,066 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 20:41:25,066 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 20:41:25,066 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 28 [2020-08-21 20:41:25,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:25,067 INFO L225 Difference]: With dead ends: 38 [2020-08-21 20:41:25,068 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 20:41:25,068 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 [2020-08-21 20:41:25,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 20:41:25,073 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 20:41:25,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 20:41:25,074 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 31 transitions. [2020-08-21 20:41:25,074 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 31 transitions. Word has length 28 [2020-08-21 20:41:25,074 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:25,075 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 31 transitions. [2020-08-21 20:41:25,075 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 20:41:25,075 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 31 transitions. [2020-08-21 20:41:25,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 20:41:25,076 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:25,076 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:25,076 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 20:41:25,077 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:25,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:25,077 INFO L82 PathProgramCache]: Analyzing trace with hash -642190641, now seen corresponding path program 9 times [2020-08-21 20:41:25,078 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:25,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [822680992] [2020-08-21 20:41:25,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:25,091 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:25,209 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:25,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:25,214 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:25,214 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [822680992] [2020-08-21 20:41:25,214 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:25,215 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 20:41:25,215 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [138705164] [2020-08-21 20:41:25,215 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 20:41:25,216 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:25,216 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 20:41:25,216 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=88, Unknown=0, NotChecked=0, Total=156 [2020-08-21 20:41:25,216 INFO L87 Difference]: Start difference. First operand 31 states and 31 transitions. Second operand 13 states. [2020-08-21 20:41:25,278 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:25,278 INFO L93 Difference]: Finished difference Result 40 states and 40 transitions. [2020-08-21 20:41:25,279 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 20:41:25,279 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 30 [2020-08-21 20:41:25,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:25,280 INFO L225 Difference]: With dead ends: 40 [2020-08-21 20:41:25,280 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 20:41:25,280 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 [2020-08-21 20:41:25,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 20:41:25,284 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 20:41:25,284 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 20:41:25,285 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-08-21 20:41:25,285 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 30 [2020-08-21 20:41:25,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:25,285 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-08-21 20:41:25,286 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 20:41:25,286 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-08-21 20:41:25,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 20:41:25,287 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:25,287 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:25,287 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 20:41:25,287 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:25,287 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:25,288 INFO L82 PathProgramCache]: Analyzing trace with hash 489362929, now seen corresponding path program 10 times [2020-08-21 20:41:25,288 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:25,288 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1802108556] [2020-08-21 20:41:25,288 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:25,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:25,411 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:25,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:25,416 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:25,416 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1802108556] [2020-08-21 20:41:25,416 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:25,416 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 20:41:25,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123987452] [2020-08-21 20:41:25,417 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 20:41:25,417 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:25,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 20:41:25,418 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:41:25,418 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 14 states. [2020-08-21 20:41:25,487 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:25,487 INFO L93 Difference]: Finished difference Result 42 states and 42 transitions. [2020-08-21 20:41:25,489 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 20:41:25,489 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 32 [2020-08-21 20:41:25,489 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:25,490 INFO L225 Difference]: With dead ends: 42 [2020-08-21 20:41:25,490 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 20:41:25,491 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=80, Invalid=102, Unknown=0, NotChecked=0, Total=182 [2020-08-21 20:41:25,491 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 20:41:25,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 20:41:25,498 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 20:41:25,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 20:41:25,499 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 32 [2020-08-21 20:41:25,499 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:25,499 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 20:41:25,499 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 20:41:25,499 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 20:41:25,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 20:41:25,505 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:25,505 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:25,505 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 20:41:25,505 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:25,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:25,506 INFO L82 PathProgramCache]: Analyzing trace with hash 1285617811, now seen corresponding path program 11 times [2020-08-21 20:41:25,506 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:25,506 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [475839831] [2020-08-21 20:41:25,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:25,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:25,664 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:25,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:25,668 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:25,669 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [475839831] [2020-08-21 20:41:25,669 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:25,669 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 20:41:25,669 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1967968954] [2020-08-21 20:41:25,670 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 20:41:25,670 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:25,670 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 20:41:25,671 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=117, Unknown=0, NotChecked=0, Total=210 [2020-08-21 20:41:25,671 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 15 states. [2020-08-21 20:41:25,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:25,765 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 20:41:25,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 20:41:25,766 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 34 [2020-08-21 20:41:25,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:25,767 INFO L225 Difference]: With dead ends: 44 [2020-08-21 20:41:25,767 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 20:41:25,768 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 [2020-08-21 20:41:25,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 20:41:25,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 20:41:25,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 20:41:25,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 37 transitions. [2020-08-21 20:41:25,772 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 37 transitions. Word has length 34 [2020-08-21 20:41:25,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:25,773 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 37 transitions. [2020-08-21 20:41:25,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 20:41:25,773 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 37 transitions. [2020-08-21 20:41:25,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 20:41:25,774 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:25,774 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:25,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 20:41:25,774 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:25,775 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:25,775 INFO L82 PathProgramCache]: Analyzing trace with hash 1982380725, now seen corresponding path program 12 times [2020-08-21 20:41:25,775 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:25,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [422750747] [2020-08-21 20:41:25,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:25,788 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:25,933 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:25,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:25,937 INFO L134 CoverageAnalysis]: Checked inductivity of 144 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:25,937 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [422750747] [2020-08-21 20:41:25,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:25,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 20:41:25,938 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [775745075] [2020-08-21 20:41:25,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 20:41:25,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:25,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 20:41:25,939 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=107, Invalid=133, Unknown=0, NotChecked=0, Total=240 [2020-08-21 20:41:25,939 INFO L87 Difference]: Start difference. First operand 37 states and 37 transitions. Second operand 16 states. [2020-08-21 20:41:26,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:26,022 INFO L93 Difference]: Finished difference Result 46 states and 46 transitions. [2020-08-21 20:41:26,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 20:41:26,023 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 36 [2020-08-21 20:41:26,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:26,023 INFO L225 Difference]: With dead ends: 46 [2020-08-21 20:41:26,023 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 20:41:26,024 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 [2020-08-21 20:41:26,024 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 20:41:26,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 20:41:26,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 20:41:26,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 39 transitions. [2020-08-21 20:41:26,029 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 39 transitions. Word has length 36 [2020-08-21 20:41:26,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:26,029 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 39 transitions. [2020-08-21 20:41:26,029 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 20:41:26,029 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 39 transitions. [2020-08-21 20:41:26,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 20:41:26,030 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:26,030 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:26,030 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 20:41:26,031 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:26,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:26,031 INFO L82 PathProgramCache]: Analyzing trace with hash 1556642903, now seen corresponding path program 13 times [2020-08-21 20:41:26,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:26,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007792939] [2020-08-21 20:41:26,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:26,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:26,216 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:26,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:26,220 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:26,221 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007792939] [2020-08-21 20:41:26,221 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:26,221 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 20:41:26,221 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489630092] [2020-08-21 20:41:26,222 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 20:41:26,222 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:26,222 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 20:41:26,222 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=122, Invalid=150, Unknown=0, NotChecked=0, Total=272 [2020-08-21 20:41:26,223 INFO L87 Difference]: Start difference. First operand 39 states and 39 transitions. Second operand 17 states. [2020-08-21 20:41:26,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:26,314 INFO L93 Difference]: Finished difference Result 48 states and 48 transitions. [2020-08-21 20:41:26,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 20:41:26,315 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 38 [2020-08-21 20:41:26,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:26,315 INFO L225 Difference]: With dead ends: 48 [2020-08-21 20:41:26,315 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 20:41:26,316 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 [2020-08-21 20:41:26,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 20:41:26,327 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 20:41:26,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 20:41:26,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 20:41:26,328 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 38 [2020-08-21 20:41:26,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:26,330 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 20:41:26,330 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 20:41:26,330 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 20:41:26,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 20:41:26,331 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:26,331 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:26,331 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 20:41:26,332 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:26,332 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:26,332 INFO L82 PathProgramCache]: Analyzing trace with hash 444489081, now seen corresponding path program 14 times [2020-08-21 20:41:26,332 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:26,333 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1262861653] [2020-08-21 20:41:26,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:26,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:26,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:26,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:26,522 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:26,522 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1262861653] [2020-08-21 20:41:26,524 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:26,524 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 20:41:26,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [617564508] [2020-08-21 20:41:26,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 20:41:26,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:26,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 20:41:26,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=168, Unknown=0, NotChecked=0, Total=306 [2020-08-21 20:41:26,526 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 18 states. [2020-08-21 20:41:26,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:26,635 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 20:41:26,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 20:41:26,636 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-21 20:41:26,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:26,637 INFO L225 Difference]: With dead ends: 50 [2020-08-21 20:41:26,637 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 20:41:26,638 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 [2020-08-21 20:41:26,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 20:41:26,644 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 20:41:26,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 20:41:26,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 43 transitions. [2020-08-21 20:41:26,645 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 43 transitions. Word has length 40 [2020-08-21 20:41:26,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:26,645 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 43 transitions. [2020-08-21 20:41:26,645 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 20:41:26,645 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 43 transitions. [2020-08-21 20:41:26,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-21 20:41:26,646 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:26,646 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:26,647 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 20:41:26,647 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:26,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:26,647 INFO L82 PathProgramCache]: Analyzing trace with hash 1111522843, now seen corresponding path program 15 times [2020-08-21 20:41:26,647 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:26,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1539839113] [2020-08-21 20:41:26,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:26,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:26,857 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:26,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:26,863 INFO L134 CoverageAnalysis]: Checked inductivity of 225 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:26,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1539839113] [2020-08-21 20:41:26,863 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:26,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 20:41:26,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440919037] [2020-08-21 20:41:26,864 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 20:41:26,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:26,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 20:41:26,865 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=155, Invalid=187, Unknown=0, NotChecked=0, Total=342 [2020-08-21 20:41:26,865 INFO L87 Difference]: Start difference. First operand 43 states and 43 transitions. Second operand 19 states. [2020-08-21 20:41:26,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:26,980 INFO L93 Difference]: Finished difference Result 52 states and 52 transitions. [2020-08-21 20:41:26,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 20:41:26,980 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 42 [2020-08-21 20:41:26,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:26,981 INFO L225 Difference]: With dead ends: 52 [2020-08-21 20:41:26,981 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 20:41:26,982 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 [2020-08-21 20:41:26,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 20:41:26,986 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 20:41:26,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 20:41:26,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 45 transitions. [2020-08-21 20:41:26,987 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 45 transitions. Word has length 42 [2020-08-21 20:41:26,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:26,987 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 45 transitions. [2020-08-21 20:41:26,987 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 20:41:26,987 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 45 transitions. [2020-08-21 20:41:26,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 20:41:26,988 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:26,988 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:26,988 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 20:41:26,989 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:26,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:26,989 INFO L82 PathProgramCache]: Analyzing trace with hash -2114126275, now seen corresponding path program 16 times [2020-08-21 20:41:26,989 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:26,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1936871946] [2020-08-21 20:41:26,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:27,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:27,222 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:27,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:27,227 INFO L134 CoverageAnalysis]: Checked inductivity of 256 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:27,228 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1936871946] [2020-08-21 20:41:27,228 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:27,228 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 20:41:27,228 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999900637] [2020-08-21 20:41:27,230 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 20:41:27,230 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:27,231 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 20:41:27,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=173, Invalid=207, Unknown=0, NotChecked=0, Total=380 [2020-08-21 20:41:27,235 INFO L87 Difference]: Start difference. First operand 45 states and 45 transitions. Second operand 20 states. [2020-08-21 20:41:27,348 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:27,348 INFO L93 Difference]: Finished difference Result 54 states and 54 transitions. [2020-08-21 20:41:27,349 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 20:41:27,349 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 44 [2020-08-21 20:41:27,349 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:27,350 INFO L225 Difference]: With dead ends: 54 [2020-08-21 20:41:27,350 INFO L226 Difference]: Without dead ends: 48 [2020-08-21 20:41:27,351 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 [2020-08-21 20:41:27,352 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-21 20:41:27,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 47. [2020-08-21 20:41:27,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-21 20:41:27,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 47 transitions. [2020-08-21 20:41:27,356 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 47 transitions. Word has length 44 [2020-08-21 20:41:27,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:27,357 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 47 transitions. [2020-08-21 20:41:27,357 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 20:41:27,357 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 47 transitions. [2020-08-21 20:41:27,358 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 20:41:27,358 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:27,358 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:27,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 20:41:27,359 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:27,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:27,359 INFO L82 PathProgramCache]: Analyzing trace with hash -996540961, now seen corresponding path program 17 times [2020-08-21 20:41:27,359 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:27,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1991492723] [2020-08-21 20:41:27,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:27,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:27,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:27,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:27,607 INFO L134 CoverageAnalysis]: Checked inductivity of 289 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:27,607 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1991492723] [2020-08-21 20:41:27,607 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:27,608 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 20:41:27,608 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [934564886] [2020-08-21 20:41:27,609 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 20:41:27,610 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:27,610 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 20:41:27,611 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=192, Invalid=228, Unknown=0, NotChecked=0, Total=420 [2020-08-21 20:41:27,611 INFO L87 Difference]: Start difference. First operand 47 states and 47 transitions. Second operand 21 states. [2020-08-21 20:41:27,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:27,717 INFO L93 Difference]: Finished difference Result 56 states and 56 transitions. [2020-08-21 20:41:27,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 20:41:27,718 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 46 [2020-08-21 20:41:27,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:27,719 INFO L225 Difference]: With dead ends: 56 [2020-08-21 20:41:27,719 INFO L226 Difference]: Without dead ends: 50 [2020-08-21 20:41:27,720 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 [2020-08-21 20:41:27,721 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2020-08-21 20:41:27,724 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 49. [2020-08-21 20:41:27,725 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 20:41:27,725 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 49 transitions. [2020-08-21 20:41:27,725 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 49 transitions. Word has length 46 [2020-08-21 20:41:27,726 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:27,726 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 49 transitions. [2020-08-21 20:41:27,726 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 20:41:27,726 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 49 transitions. [2020-08-21 20:41:27,727 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 20:41:27,727 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:27,727 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:27,727 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 20:41:27,727 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:27,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:27,728 INFO L82 PathProgramCache]: Analyzing trace with hash -738878207, now seen corresponding path program 18 times [2020-08-21 20:41:27,728 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:27,728 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1010346173] [2020-08-21 20:41:27,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:27,744 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:28,084 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:28,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:28,089 INFO L134 CoverageAnalysis]: Checked inductivity of 324 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:28,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1010346173] [2020-08-21 20:41:28,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:28,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 20:41:28,090 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [478419539] [2020-08-21 20:41:28,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 20:41:28,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:28,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 20:41:28,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:41:28,092 INFO L87 Difference]: Start difference. First operand 49 states and 49 transitions. Second operand 22 states. [2020-08-21 20:41:28,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:28,169 INFO L93 Difference]: Finished difference Result 58 states and 58 transitions. [2020-08-21 20:41:28,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 20:41:28,170 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 48 [2020-08-21 20:41:28,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:28,171 INFO L225 Difference]: With dead ends: 58 [2020-08-21 20:41:28,171 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 20:41:28,172 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=212, Invalid=250, Unknown=0, NotChecked=0, Total=462 [2020-08-21 20:41:28,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 20:41:28,182 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 20:41:28,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 20:41:28,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2020-08-21 20:41:28,185 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 48 [2020-08-21 20:41:28,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:28,185 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2020-08-21 20:41:28,185 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 20:41:28,185 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2020-08-21 20:41:28,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 20:41:28,186 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:28,186 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:28,187 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 20:41:28,190 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:28,190 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:28,190 INFO L82 PathProgramCache]: Analyzing trace with hash 2061892515, now seen corresponding path program 19 times [2020-08-21 20:41:28,191 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:28,191 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498770266] [2020-08-21 20:41:28,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:28,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:28,492 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:28,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:28,498 INFO L134 CoverageAnalysis]: Checked inductivity of 361 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:28,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498770266] [2020-08-21 20:41:28,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:28,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 20:41:28,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1221295879] [2020-08-21 20:41:28,500 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 20:41:28,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:28,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 20:41:28,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=233, Invalid=273, Unknown=0, NotChecked=0, Total=506 [2020-08-21 20:41:28,501 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand 23 states. [2020-08-21 20:41:28,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:28,689 INFO L93 Difference]: Finished difference Result 60 states and 60 transitions. [2020-08-21 20:41:28,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 20:41:28,689 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 50 [2020-08-21 20:41:28,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:28,690 INFO L225 Difference]: With dead ends: 60 [2020-08-21 20:41:28,690 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 20:41:28,698 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 [2020-08-21 20:41:28,699 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 20:41:28,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 20:41:28,702 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 20:41:28,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 53 transitions. [2020-08-21 20:41:28,703 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 53 transitions. Word has length 50 [2020-08-21 20:41:28,703 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:28,703 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 53 transitions. [2020-08-21 20:41:28,703 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 20:41:28,704 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 53 transitions. [2020-08-21 20:41:28,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 20:41:28,704 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:28,704 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:28,705 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 20:41:28,705 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:28,705 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:28,705 INFO L82 PathProgramCache]: Analyzing trace with hash 658061765, now seen corresponding path program 20 times [2020-08-21 20:41:28,705 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:28,706 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [383987544] [2020-08-21 20:41:28,706 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:28,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:29,014 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:29,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:29,024 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:29,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [383987544] [2020-08-21 20:41:29,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:29,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 20:41:29,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1225517873] [2020-08-21 20:41:29,029 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 20:41:29,030 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:29,030 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 20:41:29,032 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=255, Invalid=297, Unknown=0, NotChecked=0, Total=552 [2020-08-21 20:41:29,032 INFO L87 Difference]: Start difference. First operand 53 states and 53 transitions. Second operand 24 states. [2020-08-21 20:41:29,116 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:29,116 INFO L93 Difference]: Finished difference Result 62 states and 62 transitions. [2020-08-21 20:41:29,118 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 20:41:29,119 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 52 [2020-08-21 20:41:29,119 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:29,120 INFO L225 Difference]: With dead ends: 62 [2020-08-21 20:41:29,120 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 20:41:29,121 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 [2020-08-21 20:41:29,121 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 20:41:29,124 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 20:41:29,124 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 20:41:29,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 55 transitions. [2020-08-21 20:41:29,125 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 55 transitions. Word has length 52 [2020-08-21 20:41:29,125 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:29,125 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 55 transitions. [2020-08-21 20:41:29,126 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 20:41:29,126 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 55 transitions. [2020-08-21 20:41:29,127 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 20:41:29,127 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:29,127 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:29,127 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 20:41:29,128 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:29,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:29,128 INFO L82 PathProgramCache]: Analyzing trace with hash 196441959, now seen corresponding path program 21 times [2020-08-21 20:41:29,128 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:29,131 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1478547279] [2020-08-21 20:41:29,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:29,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:29,453 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:29,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:29,459 INFO L134 CoverageAnalysis]: Checked inductivity of 441 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:29,459 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1478547279] [2020-08-21 20:41:29,460 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:29,460 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 20:41:29,460 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1322277809] [2020-08-21 20:41:29,461 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 20:41:29,461 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:29,461 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 20:41:29,461 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=278, Invalid=322, Unknown=0, NotChecked=0, Total=600 [2020-08-21 20:41:29,462 INFO L87 Difference]: Start difference. First operand 55 states and 55 transitions. Second operand 25 states. [2020-08-21 20:41:29,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:29,586 INFO L93 Difference]: Finished difference Result 64 states and 64 transitions. [2020-08-21 20:41:29,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 20:41:29,586 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 54 [2020-08-21 20:41:29,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:29,587 INFO L225 Difference]: With dead ends: 64 [2020-08-21 20:41:29,587 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 20:41:29,589 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 [2020-08-21 20:41:29,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 20:41:29,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 20:41:29,592 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 20:41:29,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-08-21 20:41:29,599 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 54 [2020-08-21 20:41:29,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:29,600 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-08-21 20:41:29,600 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 20:41:29,600 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-08-21 20:41:29,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 20:41:29,601 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:29,601 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:29,601 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 20:41:29,601 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:29,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:29,603 INFO L82 PathProgramCache]: Analyzing trace with hash -1038560119, now seen corresponding path program 22 times [2020-08-21 20:41:29,603 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:29,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1357907647] [2020-08-21 20:41:29,604 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:29,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:29,921 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:29,922 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:29,926 INFO L134 CoverageAnalysis]: Checked inductivity of 484 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:29,926 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1357907647] [2020-08-21 20:41:29,926 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:29,926 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 20:41:29,927 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [401443210] [2020-08-21 20:41:29,927 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 20:41:29,927 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:29,927 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 20:41:29,928 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:41:29,928 INFO L87 Difference]: Start difference. First operand 57 states and 57 transitions. Second operand 26 states. [2020-08-21 20:41:30,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:30,069 INFO L93 Difference]: Finished difference Result 66 states and 66 transitions. [2020-08-21 20:41:30,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 20:41:30,069 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 56 [2020-08-21 20:41:30,070 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:30,070 INFO L225 Difference]: With dead ends: 66 [2020-08-21 20:41:30,071 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 20:41:30,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=302, Invalid=348, Unknown=0, NotChecked=0, Total=650 [2020-08-21 20:41:30,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 20:41:30,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 20:41:30,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 20:41:30,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 59 transitions. [2020-08-21 20:41:30,076 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 59 transitions. Word has length 56 [2020-08-21 20:41:30,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:30,077 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 59 transitions. [2020-08-21 20:41:30,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 20:41:30,077 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 59 transitions. [2020-08-21 20:41:30,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 20:41:30,078 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:30,079 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:30,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 20:41:30,082 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:30,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:30,083 INFO L82 PathProgramCache]: Analyzing trace with hash 1830383915, now seen corresponding path program 23 times [2020-08-21 20:41:30,083 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:30,083 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [943470182] [2020-08-21 20:41:30,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:30,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:30,472 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:30,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:30,478 INFO L134 CoverageAnalysis]: Checked inductivity of 529 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:30,478 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [943470182] [2020-08-21 20:41:30,478 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:30,478 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 20:41:30,478 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [150847291] [2020-08-21 20:41:30,479 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 20:41:30,479 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:30,479 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 20:41:30,480 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=375, Unknown=0, NotChecked=0, Total=702 [2020-08-21 20:41:30,480 INFO L87 Difference]: Start difference. First operand 59 states and 59 transitions. Second operand 27 states. [2020-08-21 20:41:30,645 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:30,645 INFO L93 Difference]: Finished difference Result 68 states and 68 transitions. [2020-08-21 20:41:30,646 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 20:41:30,646 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 58 [2020-08-21 20:41:30,646 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:30,647 INFO L225 Difference]: With dead ends: 68 [2020-08-21 20:41:30,647 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 20:41:30,648 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 [2020-08-21 20:41:30,649 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 20:41:30,652 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 20:41:30,652 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 20:41:30,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 61 transitions. [2020-08-21 20:41:30,653 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 61 transitions. Word has length 58 [2020-08-21 20:41:30,653 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:30,653 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 61 transitions. [2020-08-21 20:41:30,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 20:41:30,654 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 61 transitions. [2020-08-21 20:41:30,654 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 20:41:30,654 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:30,655 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:30,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 20:41:30,655 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:30,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:30,655 INFO L82 PathProgramCache]: Analyzing trace with hash 1516596557, now seen corresponding path program 24 times [2020-08-21 20:41:30,655 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:30,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1520386502] [2020-08-21 20:41:30,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:30,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,068 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:31,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,076 INFO L134 CoverageAnalysis]: Checked inductivity of 576 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:31,076 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1520386502] [2020-08-21 20:41:31,076 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:31,076 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 20:41:31,076 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1041837945] [2020-08-21 20:41:31,078 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 20:41:31,078 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:31,079 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 20:41:31,079 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=403, Unknown=0, NotChecked=0, Total=756 [2020-08-21 20:41:31,079 INFO L87 Difference]: Start difference. First operand 61 states and 61 transitions. Second operand 28 states. [2020-08-21 20:41:31,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:31,251 INFO L93 Difference]: Finished difference Result 70 states and 70 transitions. [2020-08-21 20:41:31,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 20:41:31,252 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 60 [2020-08-21 20:41:31,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:31,253 INFO L225 Difference]: With dead ends: 70 [2020-08-21 20:41:31,253 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 20:41:31,254 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 [2020-08-21 20:41:31,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 20:41:31,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 20:41:31,260 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 20:41:31,261 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 63 transitions. [2020-08-21 20:41:31,261 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 63 transitions. Word has length 60 [2020-08-21 20:41:31,261 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:31,261 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 63 transitions. [2020-08-21 20:41:31,261 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 20:41:31,261 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 63 transitions. [2020-08-21 20:41:31,262 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 20:41:31,262 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:31,262 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:31,262 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 20:41:31,262 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:31,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:31,264 INFO L82 PathProgramCache]: Analyzing trace with hash 614656239, now seen corresponding path program 25 times [2020-08-21 20:41:31,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:31,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1745516814] [2020-08-21 20:41:31,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:31,277 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,727 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:31,729 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:31,733 INFO L134 CoverageAnalysis]: Checked inductivity of 625 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:31,733 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1745516814] [2020-08-21 20:41:31,733 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:31,733 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 20:41:31,734 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [792941897] [2020-08-21 20:41:31,734 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 20:41:31,734 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:31,734 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 20:41:31,735 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-21 20:41:31,735 INFO L87 Difference]: Start difference. First operand 63 states and 63 transitions. Second operand 29 states. [2020-08-21 20:41:31,917 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:31,917 INFO L93 Difference]: Finished difference Result 72 states and 72 transitions. [2020-08-21 20:41:31,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 20:41:31,918 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 62 [2020-08-21 20:41:31,918 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:31,919 INFO L225 Difference]: With dead ends: 72 [2020-08-21 20:41:31,919 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 20:41:31,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=380, Invalid=432, Unknown=0, NotChecked=0, Total=812 [2020-08-21 20:41:31,921 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 20:41:31,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 20:41:31,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 20:41:31,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 65 transitions. [2020-08-21 20:41:31,925 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 65 transitions. Word has length 62 [2020-08-21 20:41:31,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:31,926 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 65 transitions. [2020-08-21 20:41:31,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 20:41:31,926 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 65 transitions. [2020-08-21 20:41:31,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 20:41:31,927 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:31,927 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:31,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 20:41:31,927 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:31,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:31,928 INFO L82 PathProgramCache]: Analyzing trace with hash 1433404433, now seen corresponding path program 26 times [2020-08-21 20:41:31,928 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:31,928 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [533748643] [2020-08-21 20:41:31,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:31,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:32,388 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:32,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:32,394 INFO L134 CoverageAnalysis]: Checked inductivity of 676 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:32,394 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [533748643] [2020-08-21 20:41:32,394 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:32,394 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 20:41:32,394 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [8497206] [2020-08-21 20:41:32,395 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 20:41:32,395 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:32,395 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 20:41:32,396 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=408, Invalid=462, Unknown=0, NotChecked=0, Total=870 [2020-08-21 20:41:32,396 INFO L87 Difference]: Start difference. First operand 65 states and 65 transitions. Second operand 30 states. [2020-08-21 20:41:32,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:32,556 INFO L93 Difference]: Finished difference Result 74 states and 74 transitions. [2020-08-21 20:41:32,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 20:41:32,557 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 64 [2020-08-21 20:41:32,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:32,558 INFO L225 Difference]: With dead ends: 74 [2020-08-21 20:41:32,558 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 20:41:32,559 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 [2020-08-21 20:41:32,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 20:41:32,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 20:41:32,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 20:41:32,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 67 transitions. [2020-08-21 20:41:32,563 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 67 transitions. Word has length 64 [2020-08-21 20:41:32,563 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:32,563 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 67 transitions. [2020-08-21 20:41:32,563 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 20:41:32,563 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 67 transitions. [2020-08-21 20:41:32,564 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 20:41:32,564 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:32,564 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:32,564 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 20:41:32,564 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:32,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:32,565 INFO L82 PathProgramCache]: Analyzing trace with hash -2023563597, now seen corresponding path program 27 times [2020-08-21 20:41:32,565 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:32,565 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1024586501] [2020-08-21 20:41:32,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:32,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:33,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:33,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:33,081 INFO L134 CoverageAnalysis]: Checked inductivity of 729 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:33,081 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1024586501] [2020-08-21 20:41:33,082 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:33,082 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 20:41:33,082 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766500030] [2020-08-21 20:41:33,082 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 20:41:33,082 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:33,082 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 20:41:33,083 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=437, Invalid=493, Unknown=0, NotChecked=0, Total=930 [2020-08-21 20:41:33,083 INFO L87 Difference]: Start difference. First operand 67 states and 67 transitions. Second operand 31 states. [2020-08-21 20:41:33,265 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:33,265 INFO L93 Difference]: Finished difference Result 76 states and 76 transitions. [2020-08-21 20:41:33,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 20:41:33,266 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 66 [2020-08-21 20:41:33,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:33,267 INFO L225 Difference]: With dead ends: 76 [2020-08-21 20:41:33,267 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 20:41:33,268 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 [2020-08-21 20:41:33,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 20:41:33,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 20:41:33,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 20:41:33,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 69 transitions. [2020-08-21 20:41:33,273 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 69 transitions. Word has length 66 [2020-08-21 20:41:33,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:33,273 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 69 transitions. [2020-08-21 20:41:33,273 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 20:41:33,274 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 69 transitions. [2020-08-21 20:41:33,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 20:41:33,274 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:33,274 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:33,275 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 20:41:33,275 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:33,275 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:33,275 INFO L82 PathProgramCache]: Analyzing trace with hash 134846677, now seen corresponding path program 28 times [2020-08-21 20:41:33,275 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:33,276 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [688230277] [2020-08-21 20:41:33,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:33,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:34,007 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:34,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:34,019 INFO L134 CoverageAnalysis]: Checked inductivity of 784 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:34,019 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [688230277] [2020-08-21 20:41:34,019 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:34,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 20:41:34,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [859811728] [2020-08-21 20:41:34,021 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 20:41:34,021 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:34,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 20:41:34,022 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-21 20:41:34,022 INFO L87 Difference]: Start difference. First operand 69 states and 69 transitions. Second operand 32 states. [2020-08-21 20:41:34,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:34,269 INFO L93 Difference]: Finished difference Result 78 states and 78 transitions. [2020-08-21 20:41:34,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 20:41:34,270 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 68 [2020-08-21 20:41:34,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:34,271 INFO L225 Difference]: With dead ends: 78 [2020-08-21 20:41:34,272 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 20:41:34,273 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=467, Invalid=525, Unknown=0, NotChecked=0, Total=992 [2020-08-21 20:41:34,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 20:41:34,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 20:41:34,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 20:41:34,279 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 71 transitions. [2020-08-21 20:41:34,279 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 71 transitions. Word has length 68 [2020-08-21 20:41:34,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:34,280 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 71 transitions. [2020-08-21 20:41:34,280 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 20:41:34,280 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 71 transitions. [2020-08-21 20:41:34,281 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 20:41:34,281 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:34,282 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:34,282 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 20:41:34,282 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:34,282 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:34,283 INFO L82 PathProgramCache]: Analyzing trace with hash -102083977, now seen corresponding path program 29 times [2020-08-21 20:41:34,283 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:34,283 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [645294004] [2020-08-21 20:41:34,284 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:34,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:34,906 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:34,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:34,916 INFO L134 CoverageAnalysis]: Checked inductivity of 841 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:34,916 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [645294004] [2020-08-21 20:41:34,916 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:34,916 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 20:41:34,917 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2049663615] [2020-08-21 20:41:34,917 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 20:41:34,917 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:34,917 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 20:41:34,918 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=498, Invalid=558, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 20:41:34,918 INFO L87 Difference]: Start difference. First operand 71 states and 71 transitions. Second operand 33 states. [2020-08-21 20:41:35,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:35,096 INFO L93 Difference]: Finished difference Result 80 states and 80 transitions. [2020-08-21 20:41:35,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 20:41:35,097 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 70 [2020-08-21 20:41:35,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:35,098 INFO L225 Difference]: With dead ends: 80 [2020-08-21 20:41:35,098 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 20:41:35,099 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 [2020-08-21 20:41:35,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 20:41:35,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 20:41:35,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 20:41:35,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 73 transitions. [2020-08-21 20:41:35,105 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 73 transitions. Word has length 70 [2020-08-21 20:41:35,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:35,105 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 73 transitions. [2020-08-21 20:41:35,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 20:41:35,106 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 73 transitions. [2020-08-21 20:41:35,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 20:41:35,107 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:35,107 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:35,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 20:41:35,108 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:35,108 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:35,109 INFO L82 PathProgramCache]: Analyzing trace with hash -159175783, now seen corresponding path program 30 times [2020-08-21 20:41:35,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:35,109 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [296080837] [2020-08-21 20:41:35,109 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:35,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:35,796 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:35,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:35,809 INFO L134 CoverageAnalysis]: Checked inductivity of 900 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:35,809 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [296080837] [2020-08-21 20:41:35,810 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:35,810 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 20:41:35,810 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1032160660] [2020-08-21 20:41:35,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 20:41:35,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:35,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 20:41:35,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 20:41:35,813 INFO L87 Difference]: Start difference. First operand 73 states and 73 transitions. Second operand 34 states. [2020-08-21 20:41:36,067 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:36,068 INFO L93 Difference]: Finished difference Result 82 states and 82 transitions. [2020-08-21 20:41:36,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 20:41:36,069 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 72 [2020-08-21 20:41:36,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:36,070 INFO L225 Difference]: With dead ends: 82 [2020-08-21 20:41:36,070 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 20:41:36,071 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=530, Invalid=592, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 20:41:36,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 20:41:36,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 20:41:36,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 20:41:36,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 75 transitions. [2020-08-21 20:41:36,076 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 75 transitions. Word has length 72 [2020-08-21 20:41:36,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:36,077 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 75 transitions. [2020-08-21 20:41:36,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 20:41:36,077 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 75 transitions. [2020-08-21 20:41:36,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 20:41:36,078 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:36,078 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:36,078 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 20:41:36,078 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:36,078 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:36,079 INFO L82 PathProgramCache]: Analyzing trace with hash 810173499, now seen corresponding path program 31 times [2020-08-21 20:41:36,079 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:36,079 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [427152429] [2020-08-21 20:41:36,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:36,103 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:36,757 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:36,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:36,764 INFO L134 CoverageAnalysis]: Checked inductivity of 961 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:36,764 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [427152429] [2020-08-21 20:41:36,764 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:36,765 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 20:41:36,765 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [779529887] [2020-08-21 20:41:36,765 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 20:41:36,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:36,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 20:41:36,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=627, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 20:41:36,767 INFO L87 Difference]: Start difference. First operand 75 states and 75 transitions. Second operand 35 states. [2020-08-21 20:41:36,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:36,971 INFO L93 Difference]: Finished difference Result 84 states and 84 transitions. [2020-08-21 20:41:36,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 20:41:36,972 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 74 [2020-08-21 20:41:36,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:36,973 INFO L225 Difference]: With dead ends: 84 [2020-08-21 20:41:36,973 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 20:41:36,974 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 [2020-08-21 20:41:36,974 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 20:41:36,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 20:41:36,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 20:41:36,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 77 transitions. [2020-08-21 20:41:36,979 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 77 transitions. Word has length 74 [2020-08-21 20:41:36,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:36,979 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 77 transitions. [2020-08-21 20:41:36,979 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 20:41:36,979 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 77 transitions. [2020-08-21 20:41:36,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 20:41:36,980 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:36,980 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:36,980 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 20:41:36,981 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:36,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:36,982 INFO L82 PathProgramCache]: Analyzing trace with hash 346930269, now seen corresponding path program 32 times [2020-08-21 20:41:36,982 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:36,982 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [67936854] [2020-08-21 20:41:36,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:37,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:37,609 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:37,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:37,621 INFO L134 CoverageAnalysis]: Checked inductivity of 1024 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:37,621 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [67936854] [2020-08-21 20:41:37,621 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:37,622 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 20:41:37,622 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183948409] [2020-08-21 20:41:37,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 20:41:37,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:37,623 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 20:41:37,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 20:41:37,624 INFO L87 Difference]: Start difference. First operand 77 states and 77 transitions. Second operand 36 states. [2020-08-21 20:41:37,775 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:37,776 INFO L93 Difference]: Finished difference Result 86 states and 86 transitions. [2020-08-21 20:41:37,776 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 20:41:37,776 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 76 [2020-08-21 20:41:37,777 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:37,777 INFO L225 Difference]: With dead ends: 86 [2020-08-21 20:41:37,777 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 20:41:37,778 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=597, Invalid=663, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 20:41:37,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 20:41:37,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 20:41:37,783 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 20:41:37,784 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 79 transitions. [2020-08-21 20:41:37,784 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 79 transitions. Word has length 76 [2020-08-21 20:41:37,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:37,784 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 79 transitions. [2020-08-21 20:41:37,784 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 20:41:37,785 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 79 transitions. [2020-08-21 20:41:37,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 20:41:37,785 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:37,785 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:37,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 20:41:37,786 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:37,786 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:37,786 INFO L82 PathProgramCache]: Analyzing trace with hash 1846785023, now seen corresponding path program 33 times [2020-08-21 20:41:37,788 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:37,790 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1007973460] [2020-08-21 20:41:37,791 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:37,807 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:38,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:38,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:38,469 INFO L134 CoverageAnalysis]: Checked inductivity of 1089 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:38,470 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1007973460] [2020-08-21 20:41:38,470 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:38,470 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 20:41:38,470 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [864663171] [2020-08-21 20:41:38,471 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 20:41:38,471 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:38,471 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 20:41:38,472 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=632, Invalid=700, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 20:41:38,472 INFO L87 Difference]: Start difference. First operand 79 states and 79 transitions. Second operand 37 states. [2020-08-21 20:41:38,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:38,715 INFO L93 Difference]: Finished difference Result 88 states and 88 transitions. [2020-08-21 20:41:38,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 20:41:38,715 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 78 [2020-08-21 20:41:38,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:38,716 INFO L225 Difference]: With dead ends: 88 [2020-08-21 20:41:38,717 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 20:41:38,718 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 [2020-08-21 20:41:38,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 20:41:38,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 20:41:38,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 20:41:38,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 81 transitions. [2020-08-21 20:41:38,722 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 81 transitions. Word has length 78 [2020-08-21 20:41:38,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:38,723 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 81 transitions. [2020-08-21 20:41:38,723 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 20:41:38,723 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 81 transitions. [2020-08-21 20:41:38,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 20:41:38,724 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:38,724 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:38,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 20:41:38,725 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:38,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:38,725 INFO L82 PathProgramCache]: Analyzing trace with hash 98192161, now seen corresponding path program 34 times [2020-08-21 20:41:38,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:38,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [202891776] [2020-08-21 20:41:38,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:38,761 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:39,696 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:39,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:39,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1156 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:39,711 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [202891776] [2020-08-21 20:41:39,711 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:39,712 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 20:41:39,712 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861968408] [2020-08-21 20:41:39,712 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 20:41:39,713 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:39,713 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 20:41:39,714 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 20:41:39,714 INFO L87 Difference]: Start difference. First operand 81 states and 81 transitions. Second operand 38 states. [2020-08-21 20:41:39,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:39,954 INFO L93 Difference]: Finished difference Result 90 states and 90 transitions. [2020-08-21 20:41:39,954 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 20:41:39,955 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 80 [2020-08-21 20:41:39,955 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:39,956 INFO L225 Difference]: With dead ends: 90 [2020-08-21 20:41:39,956 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 20:41:39,957 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=668, Invalid=738, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 20:41:39,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 20:41:39,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 20:41:39,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 20:41:39,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 83 transitions. [2020-08-21 20:41:39,963 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 83 transitions. Word has length 80 [2020-08-21 20:41:39,963 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:39,964 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 83 transitions. [2020-08-21 20:41:39,964 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 20:41:39,964 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 83 transitions. [2020-08-21 20:41:39,965 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 20:41:39,965 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:39,966 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:39,966 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 20:41:39,966 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:39,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:39,967 INFO L82 PathProgramCache]: Analyzing trace with hash -967335485, now seen corresponding path program 35 times [2020-08-21 20:41:39,967 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:39,967 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [698245085] [2020-08-21 20:41:39,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:39,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:40,819 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:40,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:40,827 INFO L134 CoverageAnalysis]: Checked inductivity of 1225 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:40,827 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [698245085] [2020-08-21 20:41:40,827 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:40,827 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 20:41:40,828 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1280679544] [2020-08-21 20:41:40,828 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 20:41:40,828 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:40,828 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 20:41:40,829 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=705, Invalid=777, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 20:41:40,829 INFO L87 Difference]: Start difference. First operand 83 states and 83 transitions. Second operand 39 states. [2020-08-21 20:41:40,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:40,979 INFO L93 Difference]: Finished difference Result 92 states and 92 transitions. [2020-08-21 20:41:40,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 20:41:40,980 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 82 [2020-08-21 20:41:40,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:40,981 INFO L225 Difference]: With dead ends: 92 [2020-08-21 20:41:40,981 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 20:41:40,981 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 [2020-08-21 20:41:40,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 20:41:40,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 20:41:40,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 20:41:40,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 85 transitions. [2020-08-21 20:41:40,988 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 85 transitions. Word has length 82 [2020-08-21 20:41:40,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:40,988 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 85 transitions. [2020-08-21 20:41:40,988 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 20:41:40,988 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 85 transitions. [2020-08-21 20:41:40,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 20:41:40,989 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:40,989 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:40,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 20:41:40,990 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:40,990 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:40,990 INFO L82 PathProgramCache]: Analyzing trace with hash 1557780453, now seen corresponding path program 36 times [2020-08-21 20:41:40,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:40,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1352008258] [2020-08-21 20:41:40,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:41,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:41,820 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:41,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:41,829 INFO L134 CoverageAnalysis]: Checked inductivity of 1296 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:41,829 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1352008258] [2020-08-21 20:41:41,829 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:41,830 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 20:41:41,830 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1217777638] [2020-08-21 20:41:41,830 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 20:41:41,830 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:41,831 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 20:41:41,832 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=743, Invalid=817, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 20:41:41,832 INFO L87 Difference]: Start difference. First operand 85 states and 85 transitions. Second operand 40 states. [2020-08-21 20:41:42,070 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:42,070 INFO L93 Difference]: Finished difference Result 94 states and 94 transitions. [2020-08-21 20:41:42,071 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 20:41:42,071 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 84 [2020-08-21 20:41:42,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:42,072 INFO L225 Difference]: With dead ends: 94 [2020-08-21 20:41:42,072 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 20:41:42,073 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 [2020-08-21 20:41:42,074 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 20:41:42,077 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 20:41:42,078 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 20:41:42,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 87 transitions. [2020-08-21 20:41:42,079 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 87 transitions. Word has length 84 [2020-08-21 20:41:42,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:42,079 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 87 transitions. [2020-08-21 20:41:42,079 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 20:41:42,079 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 87 transitions. [2020-08-21 20:41:42,080 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 20:41:42,080 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:42,080 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:42,081 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 20:41:42,081 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:42,081 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:42,081 INFO L82 PathProgramCache]: Analyzing trace with hash 1537674631, now seen corresponding path program 37 times [2020-08-21 20:41:42,082 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:42,082 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1984845398] [2020-08-21 20:41:42,082 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:42,109 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:43,026 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:43,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:43,044 INFO L134 CoverageAnalysis]: Checked inductivity of 1369 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:43,044 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1984845398] [2020-08-21 20:41:43,044 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:43,045 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 20:41:43,045 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137572808] [2020-08-21 20:41:43,045 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 20:41:43,046 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:43,046 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 20:41:43,047 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 20:41:43,047 INFO L87 Difference]: Start difference. First operand 87 states and 87 transitions. Second operand 41 states. [2020-08-21 20:41:43,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:43,335 INFO L93 Difference]: Finished difference Result 96 states and 96 transitions. [2020-08-21 20:41:43,335 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 20:41:43,336 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 86 [2020-08-21 20:41:43,336 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:43,337 INFO L225 Difference]: With dead ends: 96 [2020-08-21 20:41:43,337 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 20:41:43,338 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=782, Invalid=858, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 20:41:43,338 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 20:41:43,340 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 20:41:43,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 20:41:43,341 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 89 transitions. [2020-08-21 20:41:43,341 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 89 transitions. Word has length 86 [2020-08-21 20:41:43,341 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:43,341 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 89 transitions. [2020-08-21 20:41:43,342 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 20:41:43,342 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 89 transitions. [2020-08-21 20:41:43,342 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 20:41:43,342 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:43,342 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:43,343 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 20:41:43,343 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:43,343 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:43,343 INFO L82 PathProgramCache]: Analyzing trace with hash -604151127, now seen corresponding path program 38 times [2020-08-21 20:41:43,343 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:43,344 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1987377930] [2020-08-21 20:41:43,344 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:43,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:44,253 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:44,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:44,265 INFO L134 CoverageAnalysis]: Checked inductivity of 1444 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:44,265 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1987377930] [2020-08-21 20:41:44,266 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:44,266 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 20:41:44,266 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [627317457] [2020-08-21 20:41:44,266 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 20:41:44,266 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:44,267 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 20:41:44,267 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 20:41:44,268 INFO L87 Difference]: Start difference. First operand 89 states and 89 transitions. Second operand 42 states. [2020-08-21 20:41:44,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:44,544 INFO L93 Difference]: Finished difference Result 98 states and 98 transitions. [2020-08-21 20:41:44,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 20:41:44,545 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 88 [2020-08-21 20:41:44,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:44,546 INFO L225 Difference]: With dead ends: 98 [2020-08-21 20:41:44,546 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 20:41:44,548 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=822, Invalid=900, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 20:41:44,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 20:41:44,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 20:41:44,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 20:41:44,553 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 91 transitions. [2020-08-21 20:41:44,554 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 91 transitions. Word has length 88 [2020-08-21 20:41:44,554 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:44,554 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 91 transitions. [2020-08-21 20:41:44,554 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 20:41:44,554 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 91 transitions. [2020-08-21 20:41:44,555 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 20:41:44,555 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:44,555 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:44,555 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 20:41:44,555 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:44,555 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:44,556 INFO L82 PathProgramCache]: Analyzing trace with hash -1609369781, now seen corresponding path program 39 times [2020-08-21 20:41:44,556 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:44,556 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [918188738] [2020-08-21 20:41:44,556 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:44,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:45,496 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:45,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:45,506 INFO L134 CoverageAnalysis]: Checked inductivity of 1521 backedges. 0 proven. 1521 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:45,507 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [918188738] [2020-08-21 20:41:45,507 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:45,507 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 20:41:45,507 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [654031337] [2020-08-21 20:41:45,507 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 20:41:45,508 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:45,508 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 20:41:45,509 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=863, Invalid=943, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 20:41:45,509 INFO L87 Difference]: Start difference. First operand 91 states and 91 transitions. Second operand 43 states. [2020-08-21 20:41:45,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:45,752 INFO L93 Difference]: Finished difference Result 100 states and 100 transitions. [2020-08-21 20:41:45,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 20:41:45,753 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 90 [2020-08-21 20:41:45,753 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:45,754 INFO L225 Difference]: With dead ends: 100 [2020-08-21 20:41:45,754 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 20:41:45,756 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 [2020-08-21 20:41:45,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 20:41:45,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 20:41:45,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 20:41:45,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 93 transitions. [2020-08-21 20:41:45,760 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 93 transitions. Word has length 90 [2020-08-21 20:41:45,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:45,761 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 93 transitions. [2020-08-21 20:41:45,761 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 20:41:45,761 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 93 transitions. [2020-08-21 20:41:45,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 20:41:45,762 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:45,762 INFO L422 BasicCegarLoop]: trace histogram [40, 40, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:45,762 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 20:41:45,762 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:45,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:45,762 INFO L82 PathProgramCache]: Analyzing trace with hash -1256854675, now seen corresponding path program 40 times [2020-08-21 20:41:45,763 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:45,763 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2058379094] [2020-08-21 20:41:45,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:45,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:46,767 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:46,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:46,777 INFO L134 CoverageAnalysis]: Checked inductivity of 1600 backedges. 0 proven. 1600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:46,777 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2058379094] [2020-08-21 20:41:46,777 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:46,777 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 20:41:46,777 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903620827] [2020-08-21 20:41:46,778 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 20:41:46,778 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:46,778 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 20:41:46,779 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=905, Invalid=987, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 20:41:46,779 INFO L87 Difference]: Start difference. First operand 93 states and 93 transitions. Second operand 44 states. [2020-08-21 20:41:46,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:46,980 INFO L93 Difference]: Finished difference Result 102 states and 102 transitions. [2020-08-21 20:41:46,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 20:41:46,981 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 92 [2020-08-21 20:41:46,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:46,982 INFO L225 Difference]: With dead ends: 102 [2020-08-21 20:41:46,982 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 20:41:46,983 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 [2020-08-21 20:41:46,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 20:41:46,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 20:41:46,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 20:41:46,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 95 transitions. [2020-08-21 20:41:46,996 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 95 transitions. Word has length 92 [2020-08-21 20:41:46,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:46,996 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 95 transitions. [2020-08-21 20:41:46,998 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 20:41:46,999 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 95 transitions. [2020-08-21 20:41:46,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 20:41:46,999 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:47,000 INFO L422 BasicCegarLoop]: trace histogram [41, 41, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:47,001 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 20:41:47,002 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:47,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:47,002 INFO L82 PathProgramCache]: Analyzing trace with hash -1792254193, now seen corresponding path program 41 times [2020-08-21 20:41:47,002 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:47,003 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [585595048] [2020-08-21 20:41:47,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:47,022 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:48,058 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:48,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:48,070 INFO L134 CoverageAnalysis]: Checked inductivity of 1681 backedges. 0 proven. 1681 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:48,070 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [585595048] [2020-08-21 20:41:48,070 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:48,071 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45] total 45 [2020-08-21 20:41:48,071 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1611269874] [2020-08-21 20:41:48,071 INFO L459 AbstractCegarLoop]: Interpolant automaton has 45 states [2020-08-21 20:41:48,071 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:48,072 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2020-08-21 20:41:48,072 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=948, Invalid=1032, Unknown=0, NotChecked=0, Total=1980 [2020-08-21 20:41:48,073 INFO L87 Difference]: Start difference. First operand 95 states and 95 transitions. Second operand 45 states. [2020-08-21 20:41:48,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:48,336 INFO L93 Difference]: Finished difference Result 104 states and 104 transitions. [2020-08-21 20:41:48,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2020-08-21 20:41:48,337 INFO L78 Accepts]: Start accepts. Automaton has 45 states. Word has length 94 [2020-08-21 20:41:48,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:48,338 INFO L225 Difference]: With dead ends: 104 [2020-08-21 20:41:48,338 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 20:41:48,340 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 [2020-08-21 20:41:48,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 20:41:48,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 20:41:48,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 20:41:48,344 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 97 transitions. [2020-08-21 20:41:48,345 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 97 transitions. Word has length 94 [2020-08-21 20:41:48,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:48,345 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 97 transitions. [2020-08-21 20:41:48,345 INFO L480 AbstractCegarLoop]: Interpolant automaton has 45 states. [2020-08-21 20:41:48,345 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 97 transitions. [2020-08-21 20:41:48,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 20:41:48,346 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:48,346 INFO L422 BasicCegarLoop]: trace histogram [42, 42, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:48,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 20:41:48,346 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:48,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:48,347 INFO L82 PathProgramCache]: Analyzing trace with hash -915115471, now seen corresponding path program 42 times [2020-08-21 20:41:48,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:48,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [22287697] [2020-08-21 20:41:48,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:48,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:49,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:49,427 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:49,437 INFO L134 CoverageAnalysis]: Checked inductivity of 1764 backedges. 0 proven. 1764 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:49,437 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [22287697] [2020-08-21 20:41:49,438 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:49,438 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46] total 46 [2020-08-21 20:41:49,438 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1807055581] [2020-08-21 20:41:49,438 INFO L459 AbstractCegarLoop]: Interpolant automaton has 46 states [2020-08-21 20:41:49,438 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:49,439 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2020-08-21 20:41:49,440 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=992, Invalid=1078, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 20:41:49,440 INFO L87 Difference]: Start difference. First operand 97 states and 97 transitions. Second operand 46 states. [2020-08-21 20:41:49,623 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:49,623 INFO L93 Difference]: Finished difference Result 106 states and 106 transitions. [2020-08-21 20:41:49,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2020-08-21 20:41:49,624 INFO L78 Accepts]: Start accepts. Automaton has 46 states. Word has length 96 [2020-08-21 20:41:49,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:49,625 INFO L225 Difference]: With dead ends: 106 [2020-08-21 20:41:49,625 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 20:41:49,626 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 [2020-08-21 20:41:49,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 20:41:49,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 20:41:49,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 20:41:49,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2020-08-21 20:41:49,630 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 96 [2020-08-21 20:41:49,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:49,631 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2020-08-21 20:41:49,631 INFO L480 AbstractCegarLoop]: Interpolant automaton has 46 states. [2020-08-21 20:41:49,631 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2020-08-21 20:41:49,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 20:41:49,632 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:49,632 INFO L422 BasicCegarLoop]: trace histogram [43, 43, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:49,632 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43 [2020-08-21 20:41:49,632 INFO L427 AbstractCegarLoop]: === Iteration 45 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:49,632 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:49,633 INFO L82 PathProgramCache]: Analyzing trace with hash 201606355, now seen corresponding path program 43 times [2020-08-21 20:41:49,633 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:49,633 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1083259435] [2020-08-21 20:41:49,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:49,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:50,778 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:50,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:50,794 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1849 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:50,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1083259435] [2020-08-21 20:41:50,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:50,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47] total 47 [2020-08-21 20:41:50,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016640747] [2020-08-21 20:41:50,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 47 states [2020-08-21 20:41:50,795 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:50,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 47 interpolants. [2020-08-21 20:41:50,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 20:41:50,796 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand 47 states. [2020-08-21 20:41:51,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:51,092 INFO L93 Difference]: Finished difference Result 108 states and 108 transitions. [2020-08-21 20:41:51,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 47 states. [2020-08-21 20:41:51,093 INFO L78 Accepts]: Start accepts. Automaton has 47 states. Word has length 98 [2020-08-21 20:41:51,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:51,095 INFO L225 Difference]: With dead ends: 108 [2020-08-21 20:41:51,095 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 20:41:51,095 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 43 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1037, Invalid=1125, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 20:41:51,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 20:41:51,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 20:41:51,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 20:41:51,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 101 transitions. [2020-08-21 20:41:51,101 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 101 transitions. Word has length 98 [2020-08-21 20:41:51,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:51,101 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 101 transitions. [2020-08-21 20:41:51,102 INFO L480 AbstractCegarLoop]: Interpolant automaton has 47 states. [2020-08-21 20:41:51,102 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 101 transitions. [2020-08-21 20:41:51,102 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 20:41:51,102 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:51,102 INFO L422 BasicCegarLoop]: trace histogram [44, 44, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:51,103 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable44 [2020-08-21 20:41:51,103 INFO L427 AbstractCegarLoop]: === Iteration 46 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:51,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:51,103 INFO L82 PathProgramCache]: Analyzing trace with hash -370542859, now seen corresponding path program 44 times [2020-08-21 20:41:51,103 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:51,104 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [835937725] [2020-08-21 20:41:51,104 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:51,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:52,235 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:52,236 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:52,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1936 backedges. 0 proven. 1936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:52,254 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [835937725] [2020-08-21 20:41:52,256 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:52,256 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48] total 48 [2020-08-21 20:41:52,257 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903237938] [2020-08-21 20:41:52,257 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-08-21 20:41:52,257 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:52,257 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-08-21 20:41:52,258 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1083, Invalid=1173, Unknown=0, NotChecked=0, Total=2256 [2020-08-21 20:41:52,258 INFO L87 Difference]: Start difference. First operand 101 states and 101 transitions. Second operand 48 states. [2020-08-21 20:41:52,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:52,443 INFO L93 Difference]: Finished difference Result 110 states and 110 transitions. [2020-08-21 20:41:52,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2020-08-21 20:41:52,444 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 100 [2020-08-21 20:41:52,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:52,445 INFO L225 Difference]: With dead ends: 110 [2020-08-21 20:41:52,445 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 20:41:52,446 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 [2020-08-21 20:41:52,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 20:41:52,449 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 20:41:52,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 20:41:52,449 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 103 transitions. [2020-08-21 20:41:52,449 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 103 transitions. Word has length 100 [2020-08-21 20:41:52,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:52,450 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 103 transitions. [2020-08-21 20:41:52,450 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-08-21 20:41:52,450 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 103 transitions. [2020-08-21 20:41:52,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 20:41:52,451 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:52,451 INFO L422 BasicCegarLoop]: trace histogram [45, 45, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:52,451 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable45 [2020-08-21 20:41:52,451 INFO L427 AbstractCegarLoop]: === Iteration 47 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:52,451 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:52,451 INFO L82 PathProgramCache]: Analyzing trace with hash -450123625, now seen corresponding path program 45 times [2020-08-21 20:41:52,452 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:52,452 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [611635341] [2020-08-21 20:41:52,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:52,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:53,681 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:53,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:53,694 INFO L134 CoverageAnalysis]: Checked inductivity of 2025 backedges. 0 proven. 2025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:53,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [611635341] [2020-08-21 20:41:53,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:53,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49] total 49 [2020-08-21 20:41:53,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [397388579] [2020-08-21 20:41:53,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 49 states [2020-08-21 20:41:53,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:53,696 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2020-08-21 20:41:53,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1130, Invalid=1222, Unknown=0, NotChecked=0, Total=2352 [2020-08-21 20:41:53,696 INFO L87 Difference]: Start difference. First operand 103 states and 103 transitions. Second operand 49 states. [2020-08-21 20:41:53,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:53,901 INFO L93 Difference]: Finished difference Result 112 states and 112 transitions. [2020-08-21 20:41:53,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-08-21 20:41:53,902 INFO L78 Accepts]: Start accepts. Automaton has 49 states. Word has length 102 [2020-08-21 20:41:53,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:53,903 INFO L225 Difference]: With dead ends: 112 [2020-08-21 20:41:53,903 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 20:41:53,904 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 [2020-08-21 20:41:53,904 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 20:41:53,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 20:41:53,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 20:41:53,908 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 105 transitions. [2020-08-21 20:41:53,908 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 105 transitions. Word has length 102 [2020-08-21 20:41:53,908 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:53,909 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 105 transitions. [2020-08-21 20:41:53,909 INFO L480 AbstractCegarLoop]: Interpolant automaton has 49 states. [2020-08-21 20:41:53,909 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 105 transitions. [2020-08-21 20:41:53,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-21 20:41:53,909 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:53,909 INFO L422 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:53,909 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46 [2020-08-21 20:41:53,910 INFO L427 AbstractCegarLoop]: === Iteration 48 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:53,910 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:53,910 INFO L82 PathProgramCache]: Analyzing trace with hash 382171577, now seen corresponding path program 46 times [2020-08-21 20:41:53,910 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:53,910 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1715022105] [2020-08-21 20:41:53,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:53,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:55,261 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:55,262 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:55,272 INFO L134 CoverageAnalysis]: Checked inductivity of 2116 backedges. 0 proven. 2116 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:55,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1715022105] [2020-08-21 20:41:55,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:55,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50] total 50 [2020-08-21 20:41:55,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1706145943] [2020-08-21 20:41:55,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 50 states [2020-08-21 20:41:55,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:55,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2020-08-21 20:41:55,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 20:41:55,274 INFO L87 Difference]: Start difference. First operand 105 states and 105 transitions. Second operand 50 states. [2020-08-21 20:41:55,463 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:55,463 INFO L93 Difference]: Finished difference Result 114 states and 114 transitions. [2020-08-21 20:41:55,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2020-08-21 20:41:55,464 INFO L78 Accepts]: Start accepts. Automaton has 50 states. Word has length 104 [2020-08-21 20:41:55,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:55,465 INFO L225 Difference]: With dead ends: 114 [2020-08-21 20:41:55,466 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 20:41:55,466 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 46 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1178, Invalid=1272, Unknown=0, NotChecked=0, Total=2450 [2020-08-21 20:41:55,467 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 20:41:55,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 20:41:55,470 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 20:41:55,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 107 transitions. [2020-08-21 20:41:55,471 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 107 transitions. Word has length 104 [2020-08-21 20:41:55,471 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:55,471 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 107 transitions. [2020-08-21 20:41:55,471 INFO L480 AbstractCegarLoop]: Interpolant automaton has 50 states. [2020-08-21 20:41:55,471 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 107 transitions. [2020-08-21 20:41:55,472 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 107 [2020-08-21 20:41:55,472 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:55,472 INFO L422 BasicCegarLoop]: trace histogram [47, 47, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:55,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable47 [2020-08-21 20:41:55,472 INFO L427 AbstractCegarLoop]: === Iteration 49 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:55,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:55,473 INFO L82 PathProgramCache]: Analyzing trace with hash 1353943643, now seen corresponding path program 47 times [2020-08-21 20:41:55,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:55,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1868530033] [2020-08-21 20:41:55,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:55,491 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:56,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:56,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:56,876 INFO L134 CoverageAnalysis]: Checked inductivity of 2209 backedges. 0 proven. 2209 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:56,876 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1868530033] [2020-08-21 20:41:56,876 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:56,876 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51] total 51 [2020-08-21 20:41:56,877 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902618628] [2020-08-21 20:41:56,877 INFO L459 AbstractCegarLoop]: Interpolant automaton has 51 states [2020-08-21 20:41:56,877 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:56,878 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2020-08-21 20:41:56,878 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 20:41:56,878 INFO L87 Difference]: Start difference. First operand 107 states and 107 transitions. Second operand 51 states. [2020-08-21 20:41:57,074 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:57,074 INFO L93 Difference]: Finished difference Result 116 states and 116 transitions. [2020-08-21 20:41:57,074 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 51 states. [2020-08-21 20:41:57,074 INFO L78 Accepts]: Start accepts. Automaton has 51 states. Word has length 106 [2020-08-21 20:41:57,075 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:57,075 INFO L225 Difference]: With dead ends: 116 [2020-08-21 20:41:57,076 INFO L226 Difference]: Without dead ends: 110 [2020-08-21 20:41:57,076 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1227, Invalid=1323, Unknown=0, NotChecked=0, Total=2550 [2020-08-21 20:41:57,077 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-21 20:41:57,080 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-21 20:41:57,080 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-21 20:41:57,081 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 109 transitions. [2020-08-21 20:41:57,081 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 109 transitions. Word has length 106 [2020-08-21 20:41:57,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:57,081 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 109 transitions. [2020-08-21 20:41:57,082 INFO L480 AbstractCegarLoop]: Interpolant automaton has 51 states. [2020-08-21 20:41:57,082 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 109 transitions. [2020-08-21 20:41:57,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2020-08-21 20:41:57,082 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:57,083 INFO L422 BasicCegarLoop]: trace histogram [48, 48, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:57,083 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable48 [2020-08-21 20:41:57,083 INFO L427 AbstractCegarLoop]: === Iteration 50 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:57,083 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:57,083 INFO L82 PathProgramCache]: Analyzing trace with hash -1075971459, now seen corresponding path program 48 times [2020-08-21 20:41:57,083 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:57,084 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1063922485] [2020-08-21 20:41:57,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:57,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:58,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:41:58,488 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:41:58,498 INFO L134 CoverageAnalysis]: Checked inductivity of 2304 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:41:58,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1063922485] [2020-08-21 20:41:58,499 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:41:58,499 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52] total 52 [2020-08-21 20:41:58,499 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883898712] [2020-08-21 20:41:58,499 INFO L459 AbstractCegarLoop]: Interpolant automaton has 52 states [2020-08-21 20:41:58,500 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:41:58,500 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2020-08-21 20:41:58,500 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=1375, Unknown=0, NotChecked=0, Total=2652 [2020-08-21 20:41:58,501 INFO L87 Difference]: Start difference. First operand 109 states and 109 transitions. Second operand 52 states. [2020-08-21 20:41:58,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:41:58,727 INFO L93 Difference]: Finished difference Result 118 states and 118 transitions. [2020-08-21 20:41:58,728 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2020-08-21 20:41:58,728 INFO L78 Accepts]: Start accepts. Automaton has 52 states. Word has length 108 [2020-08-21 20:41:58,729 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:41:58,729 INFO L225 Difference]: With dead ends: 118 [2020-08-21 20:41:58,730 INFO L226 Difference]: Without dead ends: 112 [2020-08-21 20:41:58,730 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 [2020-08-21 20:41:58,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2020-08-21 20:41:58,734 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 111. [2020-08-21 20:41:58,734 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 111 states. [2020-08-21 20:41:58,734 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 111 transitions. [2020-08-21 20:41:58,735 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 111 transitions. Word has length 108 [2020-08-21 20:41:58,735 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:41:58,735 INFO L479 AbstractCegarLoop]: Abstraction has 111 states and 111 transitions. [2020-08-21 20:41:58,735 INFO L480 AbstractCegarLoop]: Interpolant automaton has 52 states. [2020-08-21 20:41:58,735 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 111 transitions. [2020-08-21 20:41:58,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 111 [2020-08-21 20:41:58,736 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:41:58,736 INFO L422 BasicCegarLoop]: trace histogram [49, 49, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:41:58,736 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49 [2020-08-21 20:41:58,736 INFO L427 AbstractCegarLoop]: === Iteration 51 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:41:58,737 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:41:58,737 INFO L82 PathProgramCache]: Analyzing trace with hash 237824543, now seen corresponding path program 49 times [2020-08-21 20:41:58,737 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:41:58,737 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1582122948] [2020-08-21 20:41:58,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:41:58,755 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:00,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:00,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:00,231 INFO L134 CoverageAnalysis]: Checked inductivity of 2401 backedges. 0 proven. 2401 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:00,232 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1582122948] [2020-08-21 20:42:00,232 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:00,232 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53] total 53 [2020-08-21 20:42:00,232 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083179400] [2020-08-21 20:42:00,232 INFO L459 AbstractCegarLoop]: Interpolant automaton has 53 states [2020-08-21 20:42:00,233 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:00,233 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2020-08-21 20:42:00,233 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1328, Invalid=1428, Unknown=0, NotChecked=0, Total=2756 [2020-08-21 20:42:00,234 INFO L87 Difference]: Start difference. First operand 111 states and 111 transitions. Second operand 53 states. [2020-08-21 20:42:00,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:00,491 INFO L93 Difference]: Finished difference Result 120 states and 120 transitions. [2020-08-21 20:42:00,491 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2020-08-21 20:42:00,492 INFO L78 Accepts]: Start accepts. Automaton has 53 states. Word has length 110 [2020-08-21 20:42:00,492 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:00,496 INFO L225 Difference]: With dead ends: 120 [2020-08-21 20:42:00,496 INFO L226 Difference]: Without dead ends: 114 [2020-08-21 20:42:00,497 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 [2020-08-21 20:42:00,497 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2020-08-21 20:42:00,500 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 113. [2020-08-21 20:42:00,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 113 states. [2020-08-21 20:42:00,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 113 transitions. [2020-08-21 20:42:00,501 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 113 transitions. Word has length 110 [2020-08-21 20:42:00,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:00,501 INFO L479 AbstractCegarLoop]: Abstraction has 113 states and 113 transitions. [2020-08-21 20:42:00,501 INFO L480 AbstractCegarLoop]: Interpolant automaton has 53 states. [2020-08-21 20:42:00,501 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 113 transitions. [2020-08-21 20:42:00,502 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2020-08-21 20:42:00,502 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:00,502 INFO L422 BasicCegarLoop]: trace histogram [50, 50, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:00,502 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50 [2020-08-21 20:42:00,503 INFO L427 AbstractCegarLoop]: === Iteration 52 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:00,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:00,503 INFO L82 PathProgramCache]: Analyzing trace with hash 75397441, now seen corresponding path program 50 times [2020-08-21 20:42:00,503 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:00,503 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [36537326] [2020-08-21 20:42:00,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:00,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:01,989 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:01,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:02,001 INFO L134 CoverageAnalysis]: Checked inductivity of 2500 backedges. 0 proven. 2500 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:02,001 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [36537326] [2020-08-21 20:42:02,001 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:02,001 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54] total 54 [2020-08-21 20:42:02,001 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1840171073] [2020-08-21 20:42:02,002 INFO L459 AbstractCegarLoop]: Interpolant automaton has 54 states [2020-08-21 20:42:02,002 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:02,002 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 54 interpolants. [2020-08-21 20:42:02,003 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-21 20:42:02,003 INFO L87 Difference]: Start difference. First operand 113 states and 113 transitions. Second operand 54 states. [2020-08-21 20:42:02,335 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:02,335 INFO L93 Difference]: Finished difference Result 122 states and 122 transitions. [2020-08-21 20:42:02,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2020-08-21 20:42:02,336 INFO L78 Accepts]: Start accepts. Automaton has 54 states. Word has length 112 [2020-08-21 20:42:02,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:02,338 INFO L225 Difference]: With dead ends: 122 [2020-08-21 20:42:02,338 INFO L226 Difference]: Without dead ends: 116 [2020-08-21 20:42:02,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1380, Invalid=1482, Unknown=0, NotChecked=0, Total=2862 [2020-08-21 20:42:02,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2020-08-21 20:42:02,343 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 115. [2020-08-21 20:42:02,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 115 states. [2020-08-21 20:42:02,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 115 transitions. [2020-08-21 20:42:02,344 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 115 transitions. Word has length 112 [2020-08-21 20:42:02,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:02,344 INFO L479 AbstractCegarLoop]: Abstraction has 115 states and 115 transitions. [2020-08-21 20:42:02,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 54 states. [2020-08-21 20:42:02,344 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 115 transitions. [2020-08-21 20:42:02,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2020-08-21 20:42:02,345 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:02,346 INFO L422 BasicCegarLoop]: trace histogram [51, 51, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:02,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51 [2020-08-21 20:42:02,346 INFO L427 AbstractCegarLoop]: === Iteration 53 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:02,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:02,346 INFO L82 PathProgramCache]: Analyzing trace with hash -1398224925, now seen corresponding path program 51 times [2020-08-21 20:42:02,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:02,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1138336252] [2020-08-21 20:42:02,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:02,373 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:03,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:03,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:03,965 INFO L134 CoverageAnalysis]: Checked inductivity of 2601 backedges. 0 proven. 2601 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:03,965 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1138336252] [2020-08-21 20:42:03,965 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:03,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55] total 55 [2020-08-21 20:42:03,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1642975746] [2020-08-21 20:42:03,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 55 states [2020-08-21 20:42:03,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:03,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2020-08-21 20:42:03,967 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-21 20:42:03,967 INFO L87 Difference]: Start difference. First operand 115 states and 115 transitions. Second operand 55 states. [2020-08-21 20:42:04,339 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:04,340 INFO L93 Difference]: Finished difference Result 124 states and 124 transitions. [2020-08-21 20:42:04,340 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2020-08-21 20:42:04,340 INFO L78 Accepts]: Start accepts. Automaton has 55 states. Word has length 114 [2020-08-21 20:42:04,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:04,342 INFO L225 Difference]: With dead ends: 124 [2020-08-21 20:42:04,342 INFO L226 Difference]: Without dead ends: 118 [2020-08-21 20:42:04,344 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 51 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1433, Invalid=1537, Unknown=0, NotChecked=0, Total=2970 [2020-08-21 20:42:04,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2020-08-21 20:42:04,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 117. [2020-08-21 20:42:04,348 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 117 states. [2020-08-21 20:42:04,348 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 117 transitions. [2020-08-21 20:42:04,348 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 117 transitions. Word has length 114 [2020-08-21 20:42:04,349 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:04,349 INFO L479 AbstractCegarLoop]: Abstraction has 117 states and 117 transitions. [2020-08-21 20:42:04,349 INFO L480 AbstractCegarLoop]: Interpolant automaton has 55 states. [2020-08-21 20:42:04,349 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 117 transitions. [2020-08-21 20:42:04,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2020-08-21 20:42:04,350 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:04,350 INFO L422 BasicCegarLoop]: trace histogram [52, 52, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:04,350 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable52 [2020-08-21 20:42:04,350 INFO L427 AbstractCegarLoop]: === Iteration 54 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:04,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:04,351 INFO L82 PathProgramCache]: Analyzing trace with hash -210110971, now seen corresponding path program 52 times [2020-08-21 20:42:04,351 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:04,351 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1534189694] [2020-08-21 20:42:04,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:04,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:06,023 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:06,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:06,034 INFO L134 CoverageAnalysis]: Checked inductivity of 2704 backedges. 0 proven. 2704 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:06,034 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1534189694] [2020-08-21 20:42:06,034 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:06,034 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56] total 56 [2020-08-21 20:42:06,034 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1575743340] [2020-08-21 20:42:06,035 INFO L459 AbstractCegarLoop]: Interpolant automaton has 56 states [2020-08-21 20:42:06,035 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:06,035 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2020-08-21 20:42:06,036 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-21 20:42:06,036 INFO L87 Difference]: Start difference. First operand 117 states and 117 transitions. Second operand 56 states. [2020-08-21 20:42:06,410 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:06,410 INFO L93 Difference]: Finished difference Result 126 states and 126 transitions. [2020-08-21 20:42:06,410 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 56 states. [2020-08-21 20:42:06,411 INFO L78 Accepts]: Start accepts. Automaton has 56 states. Word has length 116 [2020-08-21 20:42:06,411 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:06,412 INFO L225 Difference]: With dead ends: 126 [2020-08-21 20:42:06,412 INFO L226 Difference]: Without dead ends: 120 [2020-08-21 20:42:06,413 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1487, Invalid=1593, Unknown=0, NotChecked=0, Total=3080 [2020-08-21 20:42:06,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2020-08-21 20:42:06,417 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 119. [2020-08-21 20:42:06,417 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 119 states. [2020-08-21 20:42:06,417 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 119 transitions. [2020-08-21 20:42:06,417 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 119 transitions. Word has length 116 [2020-08-21 20:42:06,418 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:06,418 INFO L479 AbstractCegarLoop]: Abstraction has 119 states and 119 transitions. [2020-08-21 20:42:06,418 INFO L480 AbstractCegarLoop]: Interpolant automaton has 56 states. [2020-08-21 20:42:06,418 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 119 transitions. [2020-08-21 20:42:06,419 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2020-08-21 20:42:06,419 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:06,419 INFO L422 BasicCegarLoop]: trace histogram [53, 53, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:06,419 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53 [2020-08-21 20:42:06,419 INFO L427 AbstractCegarLoop]: === Iteration 55 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:06,419 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:06,420 INFO L82 PathProgramCache]: Analyzing trace with hash -893901913, now seen corresponding path program 53 times [2020-08-21 20:42:06,420 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:06,420 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1962748929] [2020-08-21 20:42:06,420 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:06,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:08,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:08,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:08,163 INFO L134 CoverageAnalysis]: Checked inductivity of 2809 backedges. 0 proven. 2809 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:08,163 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1962748929] [2020-08-21 20:42:08,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:08,164 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [57] total 57 [2020-08-21 20:42:08,164 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806404369] [2020-08-21 20:42:08,164 INFO L459 AbstractCegarLoop]: Interpolant automaton has 57 states [2020-08-21 20:42:08,164 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:08,165 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2020-08-21 20:42:08,166 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1542, Invalid=1650, Unknown=0, NotChecked=0, Total=3192 [2020-08-21 20:42:08,166 INFO L87 Difference]: Start difference. First operand 119 states and 119 transitions. Second operand 57 states. [2020-08-21 20:42:08,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:08,475 INFO L93 Difference]: Finished difference Result 128 states and 128 transitions. [2020-08-21 20:42:08,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 57 states. [2020-08-21 20:42:08,476 INFO L78 Accepts]: Start accepts. Automaton has 57 states. Word has length 118 [2020-08-21 20:42:08,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:08,477 INFO L225 Difference]: With dead ends: 128 [2020-08-21 20:42:08,478 INFO L226 Difference]: Without dead ends: 122 [2020-08-21 20:42:08,478 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 [2020-08-21 20:42:08,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2020-08-21 20:42:08,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 121. [2020-08-21 20:42:08,482 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 121 states. [2020-08-21 20:42:08,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 121 transitions. [2020-08-21 20:42:08,483 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 121 transitions. Word has length 118 [2020-08-21 20:42:08,483 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:08,483 INFO L479 AbstractCegarLoop]: Abstraction has 121 states and 121 transitions. [2020-08-21 20:42:08,484 INFO L480 AbstractCegarLoop]: Interpolant automaton has 57 states. [2020-08-21 20:42:08,484 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 121 transitions. [2020-08-21 20:42:08,484 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2020-08-21 20:42:08,484 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:08,485 INFO L422 BasicCegarLoop]: trace histogram [54, 54, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:08,485 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable54 [2020-08-21 20:42:08,485 INFO L427 AbstractCegarLoop]: === Iteration 56 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:08,485 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:08,485 INFO L82 PathProgramCache]: Analyzing trace with hash -887000887, now seen corresponding path program 54 times [2020-08-21 20:42:08,486 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:08,486 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [12028008] [2020-08-21 20:42:08,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:08,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:10,259 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:10,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:10,271 INFO L134 CoverageAnalysis]: Checked inductivity of 2916 backedges. 0 proven. 2916 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:10,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [12028008] [2020-08-21 20:42:10,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:10,272 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58] total 58 [2020-08-21 20:42:10,272 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [411105181] [2020-08-21 20:42:10,272 INFO L459 AbstractCegarLoop]: Interpolant automaton has 58 states [2020-08-21 20:42:10,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:10,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2020-08-21 20:42:10,273 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-21 20:42:10,273 INFO L87 Difference]: Start difference. First operand 121 states and 121 transitions. Second operand 58 states. [2020-08-21 20:42:10,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:10,646 INFO L93 Difference]: Finished difference Result 130 states and 130 transitions. [2020-08-21 20:42:10,647 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2020-08-21 20:42:10,647 INFO L78 Accepts]: Start accepts. Automaton has 58 states. Word has length 120 [2020-08-21 20:42:10,648 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:10,648 INFO L225 Difference]: With dead ends: 130 [2020-08-21 20:42:10,649 INFO L226 Difference]: Without dead ends: 124 [2020-08-21 20:42:10,649 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=1598, Invalid=1708, Unknown=0, NotChecked=0, Total=3306 [2020-08-21 20:42:10,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2020-08-21 20:42:10,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 123. [2020-08-21 20:42:10,653 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 123 states. [2020-08-21 20:42:10,654 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 123 states to 123 states and 123 transitions. [2020-08-21 20:42:10,654 INFO L78 Accepts]: Start accepts. Automaton has 123 states and 123 transitions. Word has length 120 [2020-08-21 20:42:10,654 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:10,654 INFO L479 AbstractCegarLoop]: Abstraction has 123 states and 123 transitions. [2020-08-21 20:42:10,654 INFO L480 AbstractCegarLoop]: Interpolant automaton has 58 states. [2020-08-21 20:42:10,654 INFO L276 IsEmpty]: Start isEmpty. Operand 123 states and 123 transitions. [2020-08-21 20:42:10,655 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 123 [2020-08-21 20:42:10,655 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:10,655 INFO L422 BasicCegarLoop]: trace histogram [55, 55, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:10,655 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable55 [2020-08-21 20:42:10,656 INFO L427 AbstractCegarLoop]: === Iteration 57 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:10,656 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:10,656 INFO L82 PathProgramCache]: Analyzing trace with hash 1449917803, now seen corresponding path program 55 times [2020-08-21 20:42:10,656 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:10,656 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [486139161] [2020-08-21 20:42:10,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:10,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:12,513 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:12,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:12,525 INFO L134 CoverageAnalysis]: Checked inductivity of 3025 backedges. 0 proven. 3025 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:12,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [486139161] [2020-08-21 20:42:12,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:12,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59] total 59 [2020-08-21 20:42:12,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316873035] [2020-08-21 20:42:12,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 59 states [2020-08-21 20:42:12,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:12,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2020-08-21 20:42:12,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-21 20:42:12,528 INFO L87 Difference]: Start difference. First operand 123 states and 123 transitions. Second operand 59 states. [2020-08-21 20:42:12,770 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:12,770 INFO L93 Difference]: Finished difference Result 132 states and 132 transitions. [2020-08-21 20:42:12,770 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 59 states. [2020-08-21 20:42:12,771 INFO L78 Accepts]: Start accepts. Automaton has 59 states. Word has length 122 [2020-08-21 20:42:12,771 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:12,772 INFO L225 Difference]: With dead ends: 132 [2020-08-21 20:42:12,772 INFO L226 Difference]: Without dead ends: 126 [2020-08-21 20:42:12,773 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1655, Invalid=1767, Unknown=0, NotChecked=0, Total=3422 [2020-08-21 20:42:12,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 126 states. [2020-08-21 20:42:12,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 126 to 125. [2020-08-21 20:42:12,777 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 125 states. [2020-08-21 20:42:12,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 125 transitions. [2020-08-21 20:42:12,778 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 125 transitions. Word has length 122 [2020-08-21 20:42:12,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:12,778 INFO L479 AbstractCegarLoop]: Abstraction has 125 states and 125 transitions. [2020-08-21 20:42:12,778 INFO L480 AbstractCegarLoop]: Interpolant automaton has 59 states. [2020-08-21 20:42:12,779 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 125 transitions. [2020-08-21 20:42:12,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2020-08-21 20:42:12,779 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:12,780 INFO L422 BasicCegarLoop]: trace histogram [56, 56, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:12,780 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable56 [2020-08-21 20:42:12,780 INFO L427 AbstractCegarLoop]: === Iteration 58 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:12,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:12,780 INFO L82 PathProgramCache]: Analyzing trace with hash 960883085, now seen corresponding path program 56 times [2020-08-21 20:42:12,780 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:12,780 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [996770396] [2020-08-21 20:42:12,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:12,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:14,795 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:14,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:14,810 INFO L134 CoverageAnalysis]: Checked inductivity of 3136 backedges. 0 proven. 3136 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:14,810 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [996770396] [2020-08-21 20:42:14,811 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:14,811 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60] total 60 [2020-08-21 20:42:14,811 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1119948853] [2020-08-21 20:42:14,811 INFO L459 AbstractCegarLoop]: Interpolant automaton has 60 states [2020-08-21 20:42:14,811 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:14,812 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2020-08-21 20:42:14,812 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-21 20:42:14,812 INFO L87 Difference]: Start difference. First operand 125 states and 125 transitions. Second operand 60 states. [2020-08-21 20:42:15,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:15,200 INFO L93 Difference]: Finished difference Result 134 states and 134 transitions. [2020-08-21 20:42:15,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2020-08-21 20:42:15,200 INFO L78 Accepts]: Start accepts. Automaton has 60 states. Word has length 124 [2020-08-21 20:42:15,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:15,202 INFO L225 Difference]: With dead ends: 134 [2020-08-21 20:42:15,202 INFO L226 Difference]: Without dead ends: 128 [2020-08-21 20:42:15,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 58 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1713, Invalid=1827, Unknown=0, NotChecked=0, Total=3540 [2020-08-21 20:42:15,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2020-08-21 20:42:15,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 127. [2020-08-21 20:42:15,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 127 states. [2020-08-21 20:42:15,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 127 transitions. [2020-08-21 20:42:15,207 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 127 transitions. Word has length 124 [2020-08-21 20:42:15,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:15,207 INFO L479 AbstractCegarLoop]: Abstraction has 127 states and 127 transitions. [2020-08-21 20:42:15,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 60 states. [2020-08-21 20:42:15,207 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 127 transitions. [2020-08-21 20:42:15,208 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2020-08-21 20:42:15,208 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:15,208 INFO L422 BasicCegarLoop]: trace histogram [57, 57, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:15,209 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57 [2020-08-21 20:42:15,209 INFO L427 AbstractCegarLoop]: === Iteration 59 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:15,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:15,209 INFO L82 PathProgramCache]: Analyzing trace with hash -850045649, now seen corresponding path program 57 times [2020-08-21 20:42:15,209 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:15,209 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [395765422] [2020-08-21 20:42:15,210 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:15,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:17,206 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 20:42:17,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 20:42:17,219 INFO L134 CoverageAnalysis]: Checked inductivity of 3249 backedges. 0 proven. 3249 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 20:42:17,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [395765422] [2020-08-21 20:42:17,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 20:42:17,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61] total 61 [2020-08-21 20:42:17,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [818526096] [2020-08-21 20:42:17,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 61 states [2020-08-21 20:42:17,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 20:42:17,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2020-08-21 20:42:17,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-21 20:42:17,221 INFO L87 Difference]: Start difference. First operand 127 states and 127 transitions. Second operand 61 states. [2020-08-21 20:42:17,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 20:42:17,474 INFO L93 Difference]: Finished difference Result 136 states and 136 transitions. [2020-08-21 20:42:17,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 61 states. [2020-08-21 20:42:17,475 INFO L78 Accepts]: Start accepts. Automaton has 61 states. Word has length 126 [2020-08-21 20:42:17,475 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 20:42:17,476 INFO L225 Difference]: With dead ends: 136 [2020-08-21 20:42:17,476 INFO L226 Difference]: Without dead ends: 130 [2020-08-21 20:42:17,477 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 57 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1772, Invalid=1888, Unknown=0, NotChecked=0, Total=3660 [2020-08-21 20:42:17,477 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2020-08-21 20:42:17,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 129. [2020-08-21 20:42:17,480 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 129 states. [2020-08-21 20:42:17,480 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 129 transitions. [2020-08-21 20:42:17,480 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 129 transitions. Word has length 126 [2020-08-21 20:42:17,481 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 20:42:17,481 INFO L479 AbstractCegarLoop]: Abstraction has 129 states and 129 transitions. [2020-08-21 20:42:17,481 INFO L480 AbstractCegarLoop]: Interpolant automaton has 61 states. [2020-08-21 20:42:17,481 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 129 transitions. [2020-08-21 20:42:17,482 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2020-08-21 20:42:17,482 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 20:42:17,482 INFO L422 BasicCegarLoop]: trace histogram [58, 58, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 20:42:17,482 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable58 [2020-08-21 20:42:17,482 INFO L427 AbstractCegarLoop]: === Iteration 60 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 20:42:17,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 20:42:17,483 INFO L82 PathProgramCache]: Analyzing trace with hash -1690804143, now seen corresponding path program 58 times [2020-08-21 20:42:17,483 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 20:42:17,483 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [178929404] [2020-08-21 20:42:17,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 20:42:17,503 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat