/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 false -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/ddlm2013.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 13:27:01,694 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 13:27:01,697 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 13:27:01,734 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 13:27:01,735 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 13:27:01,745 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 13:27:01,747 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 13:27:01,752 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 13:27:01,754 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 13:27:01,757 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 13:27:01,758 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 13:27:01,760 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 13:27:01,760 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 13:27:01,763 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 13:27:01,765 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 13:27:01,768 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 13:27:01,770 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 13:27:01,771 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 13:27:01,773 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 13:27:01,782 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 13:27:01,784 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 13:27:01,785 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 13:27:01,786 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 13:27:01,787 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 13:27:01,799 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2020-08-21 13:27:01,799 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2020-08-21 13:27:01,803 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2020-08-21 13:27:01,804 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2020-08-21 13:27:01,804 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2020-08-21 13:27:01,805 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... 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[2020-08-21 13:27:01,816 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 13:27:01,817 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 13:27:01,818 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 13:27:01,818 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 13:27:01,859 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 13:27:01,860 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 13:27:01,862 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 13:27:01,862 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 13:27:01,862 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 13:27:01,862 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 13:27:01,863 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 13:27:01,863 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 13:27:01,863 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 13:27:01,863 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 13:27:01,864 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 13:27:01,864 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 13:27:01,865 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 13:27:01,865 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 13:27:01,865 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 13:27:01,865 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 13:27:01,866 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 13:27:01,866 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 13:27:01,866 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 13:27:01,866 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 13:27:01,867 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 13:27:01,867 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 13:27:01,867 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 13:27:01,867 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 13:27:01,867 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 13:27:01,868 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 13:27:01,868 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 13:27:01,868 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 13:27:01,868 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 13:27:01,868 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 -> false [2020-08-21 13:27:02,217 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 13:27:02,231 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 13:27:02,234 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 13:27:02,236 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 13:27:02,237 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 13:27:02,237 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 13:27:02,319 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b5125680a/b1a40c5ee1d54118929cd8c7fe6433ee/FLAG09625a9d9 [2020-08-21 13:27:02,791 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 13:27:02,792 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/ddlm2013.i [2020-08-21 13:27:02,799 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b5125680a/b1a40c5ee1d54118929cd8c7fe6433ee/FLAG09625a9d9 [2020-08-21 13:27:03,153 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/b5125680a/b1a40c5ee1d54118929cd8c7fe6433ee [2020-08-21 13:27:03,164 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 13:27:03,166 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 13:27:03,167 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 13:27:03,167 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 13:27:03,171 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 13:27:03,172 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 01:27:03" (1/1) ... [2020-08-21 13:27:03,175 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@21af3704 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:27:03, skipping insertion in model container [2020-08-21 13:27:03,176 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 01:27:03" (1/1) ... [2020-08-21 13:27:03,184 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 13:27:03,204 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 13:27:03,412 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 13:27:03,417 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 13:27:03,436 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 13:27:03,451 INFO L208 MainTranslator]: Completed translation [2020-08-21 13:27:03,451 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:27:03 WrapperNode [2020-08-21 13:27:03,452 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 13:27:03,452 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 13:27:03,453 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 13:27:03,453 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 13:27:03,464 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:27:03" (1/1) ... [2020-08-21 13:27:03,464 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:27:03" (1/1) ... [2020-08-21 13:27:03,470 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:27:03" (1/1) ... [2020-08-21 13:27:03,470 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:27:03" (1/1) ... [2020-08-21 13:27:03,563 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:27:03" (1/1) ... [2020-08-21 13:27:03,568 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:27:03" (1/1) ... [2020-08-21 13:27:03,569 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:27:03" (1/1) ... [2020-08-21 13:27:03,571 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 13:27:03,571 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 13:27:03,572 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 13:27:03,572 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 13:27:03,573 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:27:03" (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 13:27:03,647 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 13:27:03,647 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 13:27:03,648 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-21 13:27:03,648 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 13:27:03,648 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 13:27:03,648 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 13:27:03,649 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-21 13:27:03,649 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-21 13:27:03,649 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 13:27:03,649 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-21 13:27:03,650 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 13:27:03,651 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 13:27:03,651 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 13:27:03,874 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 13:27:03,875 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-08-21 13:27:03,879 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 01:27:03 BoogieIcfgContainer [2020-08-21 13:27:03,879 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 13:27:03,880 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 13:27:03,880 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 13:27:03,884 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 13:27:03,884 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 01:27:03" (1/3) ... [2020-08-21 13:27:03,885 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6aaf366a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 01:27:03, skipping insertion in model container [2020-08-21 13:27:03,886 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 01:27:03" (2/3) ... [2020-08-21 13:27:03,886 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6aaf366a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 01:27:03, skipping insertion in model container [2020-08-21 13:27:03,886 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 01:27:03" (3/3) ... [2020-08-21 13:27:03,888 INFO L109 eAbstractionObserver]: Analyzing ICFG ddlm2013.i [2020-08-21 13:27:03,900 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 13:27:03,915 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 13:27:03,950 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 13:27:03,995 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 13:27:03,996 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 13:27:03,996 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 13:27:03,996 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 13:27:03,996 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 13:27:03,997 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 13:27:03,997 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 13:27:03,997 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 13:27:04,023 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states. [2020-08-21 13:27:04,031 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2020-08-21 13:27:04,031 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:04,033 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:04,033 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:04,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:04,040 INFO L82 PathProgramCache]: Analyzing trace with hash -917653371, now seen corresponding path program 1 times [2020-08-21 13:27:04,050 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:04,051 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [166571405] [2020-08-21 13:27:04,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:04,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:04,201 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:04,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:04,208 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 13:27:04,209 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [166571405] [2020-08-21 13:27:04,211 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:27:04,211 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-21 13:27:04,213 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57600105] [2020-08-21 13:27:04,218 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-21 13:27:04,218 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:04,229 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-21 13:27:04,230 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 13:27:04,232 INFO L87 Difference]: Start difference. First operand 22 states. Second operand 2 states. [2020-08-21 13:27:04,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:04,252 INFO L93 Difference]: Finished difference Result 35 states and 42 transitions. [2020-08-21 13:27:04,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-21 13:27:04,253 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 12 [2020-08-21 13:27:04,254 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:04,262 INFO L225 Difference]: With dead ends: 35 [2020-08-21 13:27:04,262 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 13:27:04,266 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-21 13:27:04,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 13:27:04,299 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 13:27:04,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 13:27:04,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-21 13:27:04,302 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 12 [2020-08-21 13:27:04,303 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:04,303 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-21 13:27:04,303 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-21 13:27:04,303 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-21 13:27:04,304 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 13:27:04,304 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:04,304 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:04,304 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 13:27:04,305 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:04,305 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:04,305 INFO L82 PathProgramCache]: Analyzing trace with hash -1750778295, now seen corresponding path program 1 times [2020-08-21 13:27:04,305 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:04,306 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [640050537] [2020-08-21 13:27:04,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:04,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:04,347 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:04,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:04,352 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 13:27:04,353 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [640050537] [2020-08-21 13:27:04,353 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:27:04,353 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-21 13:27:04,354 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1736169569] [2020-08-21 13:27:04,355 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-21 13:27:04,356 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:04,356 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-21 13:27:04,356 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-21 13:27:04,357 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-21 13:27:04,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:04,376 INFO L93 Difference]: Finished difference Result 24 states and 27 transitions. [2020-08-21 13:27:04,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 13:27:04,377 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 13 [2020-08-21 13:27:04,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:04,378 INFO L225 Difference]: With dead ends: 24 [2020-08-21 13:27:04,378 INFO L226 Difference]: Without dead ends: 15 [2020-08-21 13:27:04,379 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 4 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 13:27:04,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-21 13:27:04,383 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-21 13:27:04,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-21 13:27:04,384 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2020-08-21 13:27:04,385 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 13 [2020-08-21 13:27:04,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:04,385 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2020-08-21 13:27:04,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-21 13:27:04,385 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2020-08-21 13:27:04,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2020-08-21 13:27:04,386 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:04,386 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:04,387 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 13:27:04,387 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:04,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:04,388 INFO L82 PathProgramCache]: Analyzing trace with hash -941431669, now seen corresponding path program 1 times [2020-08-21 13:27:04,388 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:04,388 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2140974781] [2020-08-21 13:27:04,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:04,424 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:04,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:04,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:04,651 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 13:27:04,652 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2140974781] [2020-08-21 13:27:04,652 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:27:04,652 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 13:27:04,655 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208486786] [2020-08-21 13:27:04,655 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 13:27:04,656 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:04,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 13:27:04,658 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 13:27:04,659 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand 5 states. [2020-08-21 13:27:04,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:04,712 INFO L93 Difference]: Finished difference Result 23 states and 24 transitions. [2020-08-21 13:27:04,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 13:27:04,713 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 13 [2020-08-21 13:27:04,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:04,714 INFO L225 Difference]: With dead ends: 23 [2020-08-21 13:27:04,714 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 13:27:04,715 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-21 13:27:04,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 13:27:04,719 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 13:27:04,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 13:27:04,720 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 18 transitions. [2020-08-21 13:27:04,720 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 18 transitions. Word has length 13 [2020-08-21 13:27:04,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:04,721 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 18 transitions. [2020-08-21 13:27:04,721 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 13:27:04,721 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 18 transitions. [2020-08-21 13:27:04,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 13:27:04,722 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:04,722 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:04,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 13:27:04,723 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:04,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:04,723 INFO L82 PathProgramCache]: Analyzing trace with hash 447870728, now seen corresponding path program 1 times [2020-08-21 13:27:04,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:04,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2002660493] [2020-08-21 13:27:04,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:04,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:04,921 WARN L193 SmtUtils]: Spent 110.00 ms on a formula simplification. DAG size of input: 42 DAG size of output: 15 [2020-08-21 13:27:04,927 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:04,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:04,936 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:27:04,936 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2002660493] [2020-08-21 13:27:04,937 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 13:27:04,937 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 13:27:04,937 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [139734463] [2020-08-21 13:27:04,938 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 13:27:04,938 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:04,938 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 13:27:04,938 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 13:27:04,941 INFO L87 Difference]: Start difference. First operand 17 states and 18 transitions. Second operand 4 states. [2020-08-21 13:27:04,971 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:04,971 INFO L93 Difference]: Finished difference Result 26 states and 28 transitions. [2020-08-21 13:27:04,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 13:27:04,972 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 16 [2020-08-21 13:27:04,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:04,973 INFO L225 Difference]: With dead ends: 26 [2020-08-21 13:27:04,973 INFO L226 Difference]: Without dead ends: 17 [2020-08-21 13:27:04,974 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 13:27:04,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-21 13:27:04,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-21 13:27:04,980 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-21 13:27:04,983 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 17 transitions. [2020-08-21 13:27:04,984 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 17 transitions. Word has length 16 [2020-08-21 13:27:04,984 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:04,984 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 17 transitions. [2020-08-21 13:27:04,984 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 13:27:04,985 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 17 transitions. [2020-08-21 13:27:04,988 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-21 13:27:04,988 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:04,988 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:04,989 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 13:27:04,989 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:04,989 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:04,989 INFO L82 PathProgramCache]: Analyzing trace with hash 1257217354, now seen corresponding path program 1 times [2020-08-21 13:27:04,990 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:04,990 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2144552249] [2020-08-21 13:27:04,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:05,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:05,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:05,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:05,222 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:27:05,223 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2144552249] [2020-08-21 13:27:05,223 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:27:05,223 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 13:27:05,224 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1945351132] [2020-08-21 13:27:05,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 13:27:05,224 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:05,225 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 13:27:05,225 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2020-08-21 13:27:05,225 INFO L87 Difference]: Start difference. First operand 17 states and 17 transitions. Second operand 7 states. [2020-08-21 13:27:05,336 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:05,337 INFO L93 Difference]: Finished difference Result 26 states and 26 transitions. [2020-08-21 13:27:05,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 13:27:05,337 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 16 [2020-08-21 13:27:05,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:05,338 INFO L225 Difference]: With dead ends: 26 [2020-08-21 13:27:05,338 INFO L226 Difference]: Without dead ends: 20 [2020-08-21 13:27:05,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=25, Invalid=65, Unknown=0, NotChecked=0, Total=90 [2020-08-21 13:27:05,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-21 13:27:05,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-21 13:27:05,343 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-21 13:27:05,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 20 transitions. [2020-08-21 13:27:05,344 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 20 transitions. Word has length 16 [2020-08-21 13:27:05,344 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:05,344 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 20 transitions. [2020-08-21 13:27:05,344 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 13:27:05,344 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 20 transitions. [2020-08-21 13:27:05,345 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-21 13:27:05,345 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:05,345 INFO L422 BasicCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:05,346 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 13:27:05,346 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:05,346 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:05,347 INFO L82 PathProgramCache]: Analyzing trace with hash -1335969749, now seen corresponding path program 2 times [2020-08-21 13:27:05,347 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:05,347 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2015984778] [2020-08-21 13:27:05,347 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:05,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:05,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:05,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:05,605 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:27:05,605 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2015984778] [2020-08-21 13:27:05,606 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:27:05,606 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 13:27:05,606 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [976599766] [2020-08-21 13:27:05,607 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 13:27:05,607 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:05,607 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 13:27:05,607 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2020-08-21 13:27:05,608 INFO L87 Difference]: Start difference. First operand 20 states and 20 transitions. Second operand 9 states. [2020-08-21 13:27:05,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:05,727 INFO L93 Difference]: Finished difference Result 29 states and 29 transitions. [2020-08-21 13:27:05,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 13:27:05,731 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-21 13:27:05,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:05,732 INFO L225 Difference]: With dead ends: 29 [2020-08-21 13:27:05,732 INFO L226 Difference]: Without dead ends: 23 [2020-08-21 13:27:05,733 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=29, Invalid=103, Unknown=0, NotChecked=0, Total=132 [2020-08-21 13:27:05,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2020-08-21 13:27:05,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2020-08-21 13:27:05,736 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 23 states. [2020-08-21 13:27:05,737 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 23 transitions. [2020-08-21 13:27:05,737 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 23 transitions. Word has length 19 [2020-08-21 13:27:05,737 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:05,738 INFO L479 AbstractCegarLoop]: Abstraction has 23 states and 23 transitions. [2020-08-21 13:27:05,738 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 13:27:05,738 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 23 transitions. [2020-08-21 13:27:05,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 13:27:05,739 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:05,739 INFO L422 BasicCegarLoop]: trace histogram [4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:05,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 13:27:05,739 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:05,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:05,740 INFO L82 PathProgramCache]: Analyzing trace with hash -1396202070, now seen corresponding path program 3 times [2020-08-21 13:27:05,740 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:05,740 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1182077009] [2020-08-21 13:27:05,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:05,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:05,998 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:05,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:06,003 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:27:06,003 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1182077009] [2020-08-21 13:27:06,004 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:27:06,004 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 13:27:06,004 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511156178] [2020-08-21 13:27:06,005 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 13:27:06,005 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:06,005 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 13:27:06,005 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=91, Unknown=0, NotChecked=0, Total=110 [2020-08-21 13:27:06,006 INFO L87 Difference]: Start difference. First operand 23 states and 23 transitions. Second operand 11 states. [2020-08-21 13:27:12,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:12,440 INFO L93 Difference]: Finished difference Result 32 states and 32 transitions. [2020-08-21 13:27:12,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 13:27:12,441 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 22 [2020-08-21 13:27:12,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:12,442 INFO L225 Difference]: With dead ends: 32 [2020-08-21 13:27:12,442 INFO L226 Difference]: Without dead ends: 26 [2020-08-21 13:27:12,443 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=33, Invalid=148, Unknown=1, NotChecked=0, Total=182 [2020-08-21 13:27:12,444 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2020-08-21 13:27:12,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2020-08-21 13:27:12,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 26 states. [2020-08-21 13:27:12,451 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 26 transitions. [2020-08-21 13:27:12,451 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 26 transitions. Word has length 22 [2020-08-21 13:27:12,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:12,452 INFO L479 AbstractCegarLoop]: Abstraction has 26 states and 26 transitions. [2020-08-21 13:27:12,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 13:27:12,453 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 26 transitions. [2020-08-21 13:27:12,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-08-21 13:27:12,455 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:12,455 INFO L422 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:12,456 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 13:27:12,456 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:12,456 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:12,456 INFO L82 PathProgramCache]: Analyzing trace with hash -480947253, now seen corresponding path program 4 times [2020-08-21 13:27:12,457 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:12,458 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [929104126] [2020-08-21 13:27:12,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:12,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:12,800 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:12,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:12,807 INFO L134 CoverageAnalysis]: Checked inductivity of 26 backedges. 0 proven. 26 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:27:12,807 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [929104126] [2020-08-21 13:27:12,807 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:27:12,808 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 13:27:12,808 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2033387735] [2020-08-21 13:27:12,808 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 13:27:12,808 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:12,809 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 13:27:12,809 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=23, Invalid=133, Unknown=0, NotChecked=0, Total=156 [2020-08-21 13:27:12,809 INFO L87 Difference]: Start difference. First operand 26 states and 26 transitions. Second operand 13 states. [2020-08-21 13:27:13,057 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:13,057 INFO L93 Difference]: Finished difference Result 35 states and 35 transitions. [2020-08-21 13:27:13,058 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 13:27:13,058 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 25 [2020-08-21 13:27:13,059 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:13,059 INFO L225 Difference]: With dead ends: 35 [2020-08-21 13:27:13,060 INFO L226 Difference]: Without dead ends: 29 [2020-08-21 13:27:13,060 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=37, Invalid=203, Unknown=0, NotChecked=0, Total=240 [2020-08-21 13:27:13,062 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-21 13:27:13,067 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-21 13:27:13,067 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 13:27:13,071 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 29 transitions. [2020-08-21 13:27:13,071 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 29 transitions. Word has length 25 [2020-08-21 13:27:13,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:13,072 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 29 transitions. [2020-08-21 13:27:13,072 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 13:27:13,072 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 29 transitions. [2020-08-21 13:27:13,073 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 13:27:13,073 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:13,073 INFO L422 BasicCegarLoop]: trace histogram [6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:13,073 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 13:27:13,074 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:13,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:13,074 INFO L82 PathProgramCache]: Analyzing trace with hash 1422910986, now seen corresponding path program 5 times [2020-08-21 13:27:13,074 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:13,075 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786361731] [2020-08-21 13:27:13,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:13,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:13,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:13,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:13,499 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 0 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:27:13,499 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786361731] [2020-08-21 13:27:13,500 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:27:13,500 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 13:27:13,500 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643993708] [2020-08-21 13:27:13,501 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 13:27:13,501 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:13,501 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 13:27:13,501 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=183, Unknown=0, NotChecked=0, Total=210 [2020-08-21 13:27:13,501 INFO L87 Difference]: Start difference. First operand 29 states and 29 transitions. Second operand 15 states. [2020-08-21 13:27:20,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:20,053 INFO L93 Difference]: Finished difference Result 38 states and 38 transitions. [2020-08-21 13:27:20,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 13:27:20,054 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 28 [2020-08-21 13:27:20,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:20,055 INFO L225 Difference]: With dead ends: 38 [2020-08-21 13:27:20,055 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 13:27:20,056 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=41, Invalid=263, Unknown=2, NotChecked=0, Total=306 [2020-08-21 13:27:20,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 13:27:20,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 32. [2020-08-21 13:27:20,060 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 32 states. [2020-08-21 13:27:20,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 32 transitions. [2020-08-21 13:27:20,061 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 32 transitions. Word has length 28 [2020-08-21 13:27:20,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:20,061 INFO L479 AbstractCegarLoop]: Abstraction has 32 states and 32 transitions. [2020-08-21 13:27:20,061 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 13:27:20,061 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 32 transitions. [2020-08-21 13:27:20,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-08-21 13:27:20,062 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:20,062 INFO L422 BasicCegarLoop]: trace histogram [7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:20,063 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 13:27:20,063 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:20,063 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:20,063 INFO L82 PathProgramCache]: Analyzing trace with hash -74401941, now seen corresponding path program 6 times [2020-08-21 13:27:20,064 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:20,064 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [705131493] [2020-08-21 13:27:20,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:20,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:20,593 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:20,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:20,601 INFO L134 CoverageAnalysis]: Checked inductivity of 57 backedges. 0 proven. 57 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:27:20,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [705131493] [2020-08-21 13:27:20,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:27:20,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 13:27:20,603 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051503990] [2020-08-21 13:27:20,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 13:27:20,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:20,604 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 13:27:20,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=241, Unknown=0, NotChecked=0, Total=272 [2020-08-21 13:27:20,605 INFO L87 Difference]: Start difference. First operand 32 states and 32 transitions. Second operand 17 states. [2020-08-21 13:27:29,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:29,300 INFO L93 Difference]: Finished difference Result 41 states and 41 transitions. [2020-08-21 13:27:29,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 13:27:29,300 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 31 [2020-08-21 13:27:29,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:29,301 INFO L225 Difference]: With dead ends: 41 [2020-08-21 13:27:29,301 INFO L226 Difference]: Without dead ends: 35 [2020-08-21 13:27:29,303 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=45, Invalid=334, Unknown=1, NotChecked=0, Total=380 [2020-08-21 13:27:29,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-21 13:27:29,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-21 13:27:29,309 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 13:27:29,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 35 transitions. [2020-08-21 13:27:29,309 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 35 transitions. Word has length 31 [2020-08-21 13:27:29,310 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:29,310 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 35 transitions. [2020-08-21 13:27:29,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 13:27:29,310 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 35 transitions. [2020-08-21 13:27:29,311 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 13:27:29,311 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:29,311 INFO L422 BasicCegarLoop]: trace histogram [8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:29,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 13:27:29,312 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:29,312 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:29,312 INFO L82 PathProgramCache]: Analyzing trace with hash 1006526058, now seen corresponding path program 7 times [2020-08-21 13:27:29,312 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:29,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931290413] [2020-08-21 13:27:29,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:29,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:29,847 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:29,847 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:29,854 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 0 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:27:29,855 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931290413] [2020-08-21 13:27:29,856 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:27:29,856 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 13:27:29,856 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1613182603] [2020-08-21 13:27:29,858 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 13:27:29,858 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:29,858 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 13:27:29,859 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=307, Unknown=0, NotChecked=0, Total=342 [2020-08-21 13:27:29,859 INFO L87 Difference]: Start difference. First operand 35 states and 35 transitions. Second operand 19 states. [2020-08-21 13:27:38,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:38,675 INFO L93 Difference]: Finished difference Result 44 states and 44 transitions. [2020-08-21 13:27:38,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 13:27:38,675 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 34 [2020-08-21 13:27:38,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:38,676 INFO L225 Difference]: With dead ends: 44 [2020-08-21 13:27:38,676 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 13:27:38,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=49, Invalid=411, Unknown=2, NotChecked=0, Total=462 [2020-08-21 13:27:38,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 13:27:38,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-21 13:27:38,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-21 13:27:38,688 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 38 transitions. [2020-08-21 13:27:38,688 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 38 transitions. Word has length 34 [2020-08-21 13:27:38,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:38,690 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 38 transitions. [2020-08-21 13:27:38,690 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 13:27:38,690 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 38 transitions. [2020-08-21 13:27:38,691 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-21 13:27:38,691 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:38,691 INFO L422 BasicCegarLoop]: trace histogram [9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:38,691 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 13:27:38,692 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:38,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:38,695 INFO L82 PathProgramCache]: Analyzing trace with hash -732241141, now seen corresponding path program 8 times [2020-08-21 13:27:38,695 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:38,695 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [370897835] [2020-08-21 13:27:38,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:38,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:39,355 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:39,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:39,361 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 13:27:39,362 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [370897835] [2020-08-21 13:27:39,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:27:39,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 13:27:39,363 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1750916359] [2020-08-21 13:27:39,363 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 13:27:39,363 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:39,364 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 13:27:39,364 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=381, Unknown=0, NotChecked=0, Total=420 [2020-08-21 13:27:39,364 INFO L87 Difference]: Start difference. First operand 38 states and 38 transitions. Second operand 21 states. [2020-08-21 13:27:39,827 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:39,827 INFO L93 Difference]: Finished difference Result 47 states and 47 transitions. [2020-08-21 13:27:39,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 13:27:39,828 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 37 [2020-08-21 13:27:39,828 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:39,829 INFO L225 Difference]: With dead ends: 47 [2020-08-21 13:27:39,829 INFO L226 Difference]: Without dead ends: 41 [2020-08-21 13:27:39,830 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=499, Unknown=0, NotChecked=0, Total=552 [2020-08-21 13:27:39,830 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-21 13:27:39,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-21 13:27:39,833 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 13:27:39,834 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 41 transitions. [2020-08-21 13:27:39,834 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 41 transitions. Word has length 37 [2020-08-21 13:27:39,834 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:39,834 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 41 transitions. [2020-08-21 13:27:39,835 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 13:27:39,835 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 41 transitions. [2020-08-21 13:27:39,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-21 13:27:39,835 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:39,836 INFO L422 BasicCegarLoop]: trace histogram [10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:39,836 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 13:27:39,836 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:39,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:39,836 INFO L82 PathProgramCache]: Analyzing trace with hash 1254690506, now seen corresponding path program 9 times [2020-08-21 13:27:39,836 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:39,837 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [638592594] [2020-08-21 13:27:39,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:39,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:40,610 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:40,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:40,619 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:27:40,619 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [638592594] [2020-08-21 13:27:40,620 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:27:40,620 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 13:27:40,621 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1242607990] [2020-08-21 13:27:40,622 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 13:27:40,622 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:40,622 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 13:27:40,623 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=463, Unknown=0, NotChecked=0, Total=506 [2020-08-21 13:27:40,623 INFO L87 Difference]: Start difference. First operand 41 states and 41 transitions. Second operand 23 states. [2020-08-21 13:27:55,714 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 13:27:55,715 INFO L93 Difference]: Finished difference Result 50 states and 50 transitions. [2020-08-21 13:27:55,715 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 13:27:55,715 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 40 [2020-08-21 13:27:55,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 13:27:55,716 INFO L225 Difference]: With dead ends: 50 [2020-08-21 13:27:55,716 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 13:27:55,717 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=57, Invalid=591, Unknown=2, NotChecked=0, Total=650 [2020-08-21 13:27:55,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 13:27:55,721 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-21 13:27:55,721 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-21 13:27:55,722 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 44 transitions. [2020-08-21 13:27:55,722 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 44 transitions. Word has length 40 [2020-08-21 13:27:55,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 13:27:55,722 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 44 transitions. [2020-08-21 13:27:55,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 13:27:55,723 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 44 transitions. [2020-08-21 13:27:55,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-21 13:27:55,723 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 13:27:55,724 INFO L422 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 13:27:55,724 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 13:27:55,724 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 13:27:55,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 13:27:55,724 INFO L82 PathProgramCache]: Analyzing trace with hash 696112811, now seen corresponding path program 10 times [2020-08-21 13:27:55,725 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 13:27:55,725 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1687414967] [2020-08-21 13:27:55,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 13:27:55,758 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:56,572 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 13:27:56,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 13:27:56,581 INFO L134 CoverageAnalysis]: Checked inductivity of 155 backedges. 0 proven. 155 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 13:27:56,582 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1687414967] [2020-08-21 13:27:56,582 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 13:27:56,582 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 13:27:56,582 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433543266] [2020-08-21 13:27:56,583 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 13:27:56,583 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 13:27:56,583 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 13:27:56,584 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=553, Unknown=0, NotChecked=0, Total=600 [2020-08-21 13:27:56,584 INFO L87 Difference]: Start difference. First operand 44 states and 44 transitions. Second operand 25 states.