/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=SMALLESTAMONGWIDE --traceabstraction.additional.smt.options tolerance=0.4 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-19 06:08:14,714 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 06:08:14,718 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 06:08:14,759 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 06:08:14,759 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 06:08:14,774 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 06:08:14,776 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 06:08:14,779 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 06:08:14,781 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 06:08:14,783 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 06:08:14,785 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 06:08:14,787 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 06:08:14,788 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 06:08:14,791 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 06:08:14,792 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 06:08:14,793 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 06:08:14,795 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 06:08:14,796 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 06:08:14,798 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 06:08:14,804 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 06:08:14,809 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 06:08:14,810 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 06:08:14,811 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 06:08:14,812 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 06:08:14,817 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 06:08:14,828 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 06:08:14,829 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 06:08:14,830 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 06:08:14,831 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 [2020-08-19 06:08:14,876 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 06:08:14,876 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 06:08:14,878 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 06:08:14,879 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 06:08:14,879 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 06:08:14,879 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 06:08:14,879 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 06:08:14,880 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 06:08:14,880 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 06:08:14,880 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 06:08:14,881 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 06:08:14,881 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 06:08:14,881 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 06:08:14,882 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 06:08:14,882 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 06:08:14,882 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 06:08:14,882 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 06:08:14,883 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 06:08:14,883 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 06:08:14,883 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 06:08:14,883 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 06:08:14,883 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 06:08:14,884 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 06:08:14,884 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 06:08:14,884 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 06:08:14,884 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 06:08:14,884 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 06:08:14,885 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 06:08:14,885 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 06:08:14,885 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.4; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.4; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SMALLESTAMONGWIDE;tolerance=0.4; [2020-08-19 06:08:15,187 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 06:08:15,212 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 06:08:15,218 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 06:08:15,220 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 06:08:15,220 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 06:08:15,221 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-19 06:08:15,285 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8dda07df2/73ffb90e13df482aab42c166b7257183/FLAG9f2803de7 [2020-08-19 06:08:15,745 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 06:08:15,746 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/loop-lit/cggmp2005b.i [2020-08-19 06:08:15,752 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8dda07df2/73ffb90e13df482aab42c166b7257183/FLAG9f2803de7 [2020-08-19 06:08:16,172 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8dda07df2/73ffb90e13df482aab42c166b7257183 [2020-08-19 06:08:16,184 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 06:08:16,186 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 06:08:16,187 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 06:08:16,188 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 06:08:16,191 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 06:08:16,192 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:08:16" (1/1) ... [2020-08-19 06:08:16,195 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1190dd1c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:16, skipping insertion in model container [2020-08-19 06:08:16,196 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 06:08:16" (1/1) ... [2020-08-19 06:08:16,204 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 06:08:16,218 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 06:08:16,381 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:08:16,386 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 06:08:16,402 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 06:08:16,417 INFO L208 MainTranslator]: Completed translation [2020-08-19 06:08:16,417 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:16 WrapperNode [2020-08-19 06:08:16,418 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 06:08:16,418 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 06:08:16,419 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 06:08:16,419 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 06:08:16,429 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:16" (1/1) ... [2020-08-19 06:08:16,429 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:16" (1/1) ... [2020-08-19 06:08:16,512 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:16" (1/1) ... [2020-08-19 06:08:16,512 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:16" (1/1) ... [2020-08-19 06:08:16,517 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:16" (1/1) ... [2020-08-19 06:08:16,522 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:16" (1/1) ... [2020-08-19 06:08:16,523 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:16" (1/1) ... [2020-08-19 06:08:16,524 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 06:08:16,525 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 06:08:16,525 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 06:08:16,525 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 06:08:16,526 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:16" (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 [2020-08-19 06:08:16,590 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 06:08:16,591 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 06:08:16,591 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2020-08-19 06:08:16,591 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 06:08:16,591 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 06:08:16,591 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 06:08:16,591 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-08-19 06:08:16,592 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2020-08-19 06:08:16,592 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 06:08:16,592 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_nondet_int [2020-08-19 06:08:16,592 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 06:08:16,592 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 06:08:16,592 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 06:08:16,784 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 06:08:16,785 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 06:08:16,789 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:08:16 BoogieIcfgContainer [2020-08-19 06:08:16,789 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 06:08:16,790 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 06:08:16,791 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 06:08:16,794 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 06:08:16,794 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 06:08:16" (1/3) ... [2020-08-19 06:08:16,795 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51b0c639 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:08:16, skipping insertion in model container [2020-08-19 06:08:16,795 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 06:08:16" (2/3) ... [2020-08-19 06:08:16,795 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51b0c639 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 06:08:16, skipping insertion in model container [2020-08-19 06:08:16,796 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 06:08:16" (3/3) ... [2020-08-19 06:08:16,797 INFO L109 eAbstractionObserver]: Analyzing ICFG cggmp2005b.i [2020-08-19 06:08:16,809 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 06:08:16,819 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 06:08:16,835 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 06:08:16,867 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 06:08:16,867 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 06:08:16,868 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 06:08:16,868 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 06:08:16,868 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 06:08:16,869 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 06:08:16,869 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 06:08:16,869 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 06:08:16,895 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states. [2020-08-19 06:08:16,901 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 06:08:16,902 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:16,903 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:16,904 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:16,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:16,912 INFO L82 PathProgramCache]: Analyzing trace with hash -1039733575, now seen corresponding path program 1 times [2020-08-19 06:08:16,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:16,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [653900902] [2020-08-19 06:08:16,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:17,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,031 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:17,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,037 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:17,038 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [653900902] [2020-08-19 06:08:17,040 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:08:17,041 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2020-08-19 06:08:17,042 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1911470110] [2020-08-19 06:08:17,047 INFO L459 AbstractCegarLoop]: Interpolant automaton has 2 states [2020-08-19 06:08:17,048 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:17,063 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2020-08-19 06:08:17,064 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2020-08-19 06:08:17,066 INFO L87 Difference]: Start difference. First operand 21 states. Second operand 2 states. [2020-08-19 06:08:17,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:17,092 INFO L93 Difference]: Finished difference Result 37 states and 50 transitions. [2020-08-19 06:08:17,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2020-08-19 06:08:17,094 INFO L78 Accepts]: Start accepts. Automaton has 2 states. Word has length 10 [2020-08-19 06:08:17,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:17,103 INFO L225 Difference]: With dead ends: 37 [2020-08-19 06:08:17,103 INFO L226 Difference]: Without dead ends: 14 [2020-08-19 06:08:17,107 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 [2020-08-19 06:08:17,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2020-08-19 06:08:17,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2020-08-19 06:08:17,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 14 states. [2020-08-19 06:08:17,145 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2020-08-19 06:08:17,147 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 10 [2020-08-19 06:08:17,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:17,147 INFO L479 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2020-08-19 06:08:17,147 INFO L480 AbstractCegarLoop]: Interpolant automaton has 2 states. [2020-08-19 06:08:17,148 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2020-08-19 06:08:17,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-08-19 06:08:17,149 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:17,149 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:17,149 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 06:08:17,149 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:17,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:17,150 INFO L82 PathProgramCache]: Analyzing trace with hash -1066515684, now seen corresponding path program 1 times [2020-08-19 06:08:17,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:17,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [53391339] [2020-08-19 06:08:17,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:17,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:17,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,199 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:17,200 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [53391339] [2020-08-19 06:08:17,200 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:08:17,200 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 06:08:17,201 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1681309804] [2020-08-19 06:08:17,202 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 06:08:17,203 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:17,203 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 06:08:17,204 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 06:08:17,204 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand 3 states. [2020-08-19 06:08:17,219 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:17,220 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-08-19 06:08:17,220 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 06:08:17,221 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-08-19 06:08:17,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:17,222 INFO L225 Difference]: With dead ends: 20 [2020-08-19 06:08:17,222 INFO L226 Difference]: Without dead ends: 15 [2020-08-19 06:08:17,223 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 [2020-08-19 06:08:17,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-08-19 06:08:17,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-08-19 06:08:17,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-08-19 06:08:17,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2020-08-19 06:08:17,229 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2020-08-19 06:08:17,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:17,229 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2020-08-19 06:08:17,229 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 06:08:17,229 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2020-08-19 06:08:17,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-08-19 06:08:17,230 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:17,231 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:17,231 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 06:08:17,231 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:17,231 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:17,232 INFO L82 PathProgramCache]: Analyzing trace with hash 1875131310, now seen corresponding path program 1 times [2020-08-19 06:08:17,232 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:17,232 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [712175620] [2020-08-19 06:08:17,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:17,246 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:17,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,268 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:17,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [712175620] [2020-08-19 06:08:17,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:08:17,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-08-19 06:08:17,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521641477] [2020-08-19 06:08:17,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-08-19 06:08:17,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:17,271 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-08-19 06:08:17,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-08-19 06:08:17,271 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand 3 states. [2020-08-19 06:08:17,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:17,292 INFO L93 Difference]: Finished difference Result 25 states and 30 transitions. [2020-08-19 06:08:17,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 06:08:17,293 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 14 [2020-08-19 06:08:17,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:17,294 INFO L225 Difference]: With dead ends: 25 [2020-08-19 06:08:17,294 INFO L226 Difference]: Without dead ends: 16 [2020-08-19 06:08:17,295 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 [2020-08-19 06:08:17,296 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2020-08-19 06:08:17,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2020-08-19 06:08:17,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 16 states. [2020-08-19 06:08:17,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2020-08-19 06:08:17,301 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2020-08-19 06:08:17,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:17,302 INFO L479 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2020-08-19 06:08:17,302 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-08-19 06:08:17,302 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2020-08-19 06:08:17,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2020-08-19 06:08:17,303 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:17,303 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:17,303 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 06:08:17,303 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:17,304 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:17,304 INFO L82 PathProgramCache]: Analyzing trace with hash -224898986, now seen corresponding path program 1 times [2020-08-19 06:08:17,304 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:17,305 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1662063698] [2020-08-19 06:08:17,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:17,314 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,359 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:17,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,364 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:17,364 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1662063698] [2020-08-19 06:08:17,365 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:17,365 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 06:08:17,365 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2105747770] [2020-08-19 06:08:17,366 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:08:17,366 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:17,366 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:08:17,367 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:08:17,367 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand 5 states. [2020-08-19 06:08:17,442 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:17,443 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-08-19 06:08:17,443 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:08:17,444 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 15 [2020-08-19 06:08:17,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:17,445 INFO L225 Difference]: With dead ends: 26 [2020-08-19 06:08:17,445 INFO L226 Difference]: Without dead ends: 17 [2020-08-19 06:08:17,446 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=24, Unknown=0, NotChecked=0, Total=42 [2020-08-19 06:08:17,446 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2020-08-19 06:08:17,450 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2020-08-19 06:08:17,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 17 states. [2020-08-19 06:08:17,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2020-08-19 06:08:17,452 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 15 [2020-08-19 06:08:17,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:17,453 INFO L479 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2020-08-19 06:08:17,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:08:17,453 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2020-08-19 06:08:17,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2020-08-19 06:08:17,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:17,454 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:17,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 06:08:17,455 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:17,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:17,455 INFO L82 PathProgramCache]: Analyzing trace with hash -901328722, now seen corresponding path program 2 times [2020-08-19 06:08:17,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:17,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1812775324] [2020-08-19 06:08:17,456 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:17,466 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:17,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,540 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:17,541 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1812775324] [2020-08-19 06:08:17,541 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:17,541 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 06:08:17,541 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1550819887] [2020-08-19 06:08:17,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 06:08:17,542 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:17,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 06:08:17,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:08:17,543 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand 6 states. [2020-08-19 06:08:17,635 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:17,635 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2020-08-19 06:08:17,636 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 06:08:17,636 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 16 [2020-08-19 06:08:17,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:17,637 INFO L225 Difference]: With dead ends: 27 [2020-08-19 06:08:17,637 INFO L226 Difference]: Without dead ends: 18 [2020-08-19 06:08:17,638 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2020-08-19 06:08:17,638 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2020-08-19 06:08:17,642 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2020-08-19 06:08:17,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 18 states. [2020-08-19 06:08:17,643 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2020-08-19 06:08:17,644 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 16 [2020-08-19 06:08:17,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:17,644 INFO L479 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2020-08-19 06:08:17,644 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 06:08:17,645 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2020-08-19 06:08:17,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2020-08-19 06:08:17,646 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:17,646 INFO L422 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:17,646 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 06:08:17,647 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:17,647 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:17,647 INFO L82 PathProgramCache]: Analyzing trace with hash -395814058, now seen corresponding path program 3 times [2020-08-19 06:08:17,648 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:17,648 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2067429395] [2020-08-19 06:08:17,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:17,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,736 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:17,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,740 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:17,740 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2067429395] [2020-08-19 06:08:17,741 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:17,741 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 06:08:17,741 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89647888] [2020-08-19 06:08:17,742 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 06:08:17,742 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:17,743 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 06:08:17,743 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 06:08:17,743 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand 7 states. [2020-08-19 06:08:17,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:17,851 INFO L93 Difference]: Finished difference Result 28 states and 33 transitions. [2020-08-19 06:08:17,852 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 06:08:17,852 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 17 [2020-08-19 06:08:17,852 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:17,853 INFO L225 Difference]: With dead ends: 28 [2020-08-19 06:08:17,853 INFO L226 Difference]: Without dead ends: 19 [2020-08-19 06:08:17,854 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2020-08-19 06:08:17,854 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2020-08-19 06:08:17,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2020-08-19 06:08:17,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 19 states. [2020-08-19 06:08:17,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2020-08-19 06:08:17,860 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 17 [2020-08-19 06:08:17,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:17,861 INFO L479 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2020-08-19 06:08:17,861 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 06:08:17,861 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2020-08-19 06:08:17,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2020-08-19 06:08:17,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:17,862 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:17,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 06:08:17,862 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:17,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:17,863 INFO L82 PathProgramCache]: Analyzing trace with hash -1904728658, now seen corresponding path program 4 times [2020-08-19 06:08:17,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:17,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [410331381] [2020-08-19 06:08:17,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:17,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,965 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:17,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:17,969 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:17,969 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [410331381] [2020-08-19 06:08:17,969 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:17,970 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 06:08:17,970 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2118076056] [2020-08-19 06:08:17,970 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 06:08:17,971 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:17,971 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 06:08:17,971 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2020-08-19 06:08:17,971 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand 8 states. [2020-08-19 06:08:18,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:18,096 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-08-19 06:08:18,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 06:08:18,096 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 18 [2020-08-19 06:08:18,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:18,097 INFO L225 Difference]: With dead ends: 29 [2020-08-19 06:08:18,097 INFO L226 Difference]: Without dead ends: 20 [2020-08-19 06:08:18,098 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=102, Unknown=0, NotChecked=0, Total=156 [2020-08-19 06:08:18,099 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2020-08-19 06:08:18,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2020-08-19 06:08:18,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 20 states. [2020-08-19 06:08:18,104 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2020-08-19 06:08:18,104 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 18 [2020-08-19 06:08:18,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:18,105 INFO L479 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2020-08-19 06:08:18,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 06:08:18,105 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2020-08-19 06:08:18,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2020-08-19 06:08:18,106 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:18,106 INFO L422 BasicCegarLoop]: trace histogram [5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:18,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 06:08:18,106 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:18,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:18,107 INFO L82 PathProgramCache]: Analyzing trace with hash -1436441002, now seen corresponding path program 5 times [2020-08-19 06:08:18,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:18,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1436692444] [2020-08-19 06:08:18,108 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:18,120 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,211 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:18,212 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,218 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 15 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 06:08:18,218 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1436692444] [2020-08-19 06:08:18,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:18,219 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 06:08:18,219 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820235202] [2020-08-19 06:08:18,219 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 06:08:18,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:18,220 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 06:08:18,220 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-08-19 06:08:18,220 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand 9 states. [2020-08-19 06:08:18,369 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:18,370 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2020-08-19 06:08:18,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 06:08:18,370 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 19 [2020-08-19 06:08:18,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:18,371 INFO L225 Difference]: With dead ends: 30 [2020-08-19 06:08:18,371 INFO L226 Difference]: Without dead ends: 21 [2020-08-19 06:08:18,372 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=70, Invalid=140, Unknown=0, NotChecked=0, Total=210 [2020-08-19 06:08:18,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-08-19 06:08:18,376 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-08-19 06:08:18,376 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-08-19 06:08:18,377 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 23 transitions. [2020-08-19 06:08:18,377 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 23 transitions. Word has length 19 [2020-08-19 06:08:18,377 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:18,377 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 23 transitions. [2020-08-19 06:08:18,377 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 06:08:18,378 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 23 transitions. [2020-08-19 06:08:18,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 06:08:18,378 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:18,378 INFO L422 BasicCegarLoop]: trace histogram [6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:18,379 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 06:08:18,379 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:18,379 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:18,379 INFO L82 PathProgramCache]: Analyzing trace with hash 195574446, now seen corresponding path program 6 times [2020-08-19 06:08:18,379 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:18,380 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [167355828] [2020-08-19 06:08:18,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:18,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,412 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:18,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,414 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:18,414 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [167355828] [2020-08-19 06:08:18,415 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:18,415 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4] total 4 [2020-08-19 06:08:18,415 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051270377] [2020-08-19 06:08:18,416 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 06:08:18,416 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:18,416 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 06:08:18,416 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:08:18,416 INFO L87 Difference]: Start difference. First operand 21 states and 23 transitions. Second operand 4 states. [2020-08-19 06:08:18,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:18,431 INFO L93 Difference]: Finished difference Result 30 states and 34 transitions. [2020-08-19 06:08:18,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 06:08:18,431 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-19 06:08:18,432 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:18,432 INFO L225 Difference]: With dead ends: 30 [2020-08-19 06:08:18,432 INFO L226 Difference]: Without dead ends: 25 [2020-08-19 06:08:18,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2020-08-19 06:08:18,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2020-08-19 06:08:18,437 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2020-08-19 06:08:18,438 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 25 states. [2020-08-19 06:08:18,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 29 transitions. [2020-08-19 06:08:18,439 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 29 transitions. Word has length 20 [2020-08-19 06:08:18,439 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:18,439 INFO L479 AbstractCegarLoop]: Abstraction has 25 states and 29 transitions. [2020-08-19 06:08:18,439 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 06:08:18,439 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 29 transitions. [2020-08-19 06:08:18,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 06:08:18,440 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:18,440 INFO L422 BasicCegarLoop]: trace histogram [6, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:18,440 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 06:08:18,441 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:18,441 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:18,441 INFO L82 PathProgramCache]: Analyzing trace with hash 389290560, now seen corresponding path program 7 times [2020-08-19 06:08:18,441 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:18,441 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1567897988] [2020-08-19 06:08:18,442 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:18,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,480 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:18,481 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,483 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:18,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1567897988] [2020-08-19 06:08:18,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:18,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5] total 5 [2020-08-19 06:08:18,484 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1970923786] [2020-08-19 06:08:18,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:08:18,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:18,485 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:08:18,485 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:08:18,485 INFO L87 Difference]: Start difference. First operand 25 states and 29 transitions. Second operand 5 states. [2020-08-19 06:08:18,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:18,503 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2020-08-19 06:08:18,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:08:18,504 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 24 [2020-08-19 06:08:18,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:18,505 INFO L225 Difference]: With dead ends: 34 [2020-08-19 06:08:18,505 INFO L226 Difference]: Without dead ends: 29 [2020-08-19 06:08:18,505 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=10, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:08:18,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2020-08-19 06:08:18,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2020-08-19 06:08:18,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 06:08:18,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2020-08-19 06:08:18,511 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 24 [2020-08-19 06:08:18,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:18,512 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2020-08-19 06:08:18,512 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:08:18,512 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2020-08-19 06:08:18,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 06:08:18,513 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:18,513 INFO L422 BasicCegarLoop]: trace histogram [6, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:18,513 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 06:08:18,514 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:18,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:18,514 INFO L82 PathProgramCache]: Analyzing trace with hash -1279139630, now seen corresponding path program 8 times [2020-08-19 06:08:18,514 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:18,515 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1520081367] [2020-08-19 06:08:18,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:18,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,557 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:18,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,560 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:18,560 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1520081367] [2020-08-19 06:08:18,560 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:18,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 06:08:18,561 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [731885233] [2020-08-19 06:08:18,561 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 06:08:18,561 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:18,562 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 06:08:18,562 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:08:18,562 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand 6 states. [2020-08-19 06:08:18,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:18,589 INFO L93 Difference]: Finished difference Result 38 states and 46 transitions. [2020-08-19 06:08:18,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 06:08:18,590 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 28 [2020-08-19 06:08:18,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:18,591 INFO L225 Difference]: With dead ends: 38 [2020-08-19 06:08:18,591 INFO L226 Difference]: Without dead ends: 33 [2020-08-19 06:08:18,591 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=15, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:08:18,592 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-08-19 06:08:18,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-08-19 06:08:18,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 06:08:18,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2020-08-19 06:08:18,598 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 28 [2020-08-19 06:08:18,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:18,599 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2020-08-19 06:08:18,599 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 06:08:18,599 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2020-08-19 06:08:18,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 06:08:18,600 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:18,600 INFO L422 BasicCegarLoop]: trace histogram [6, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:18,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 06:08:18,600 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:18,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:18,601 INFO L82 PathProgramCache]: Analyzing trace with hash 805703268, now seen corresponding path program 9 times [2020-08-19 06:08:18,601 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:18,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1919108040] [2020-08-19 06:08:18,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:18,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,689 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:18,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:18,694 INFO L134 CoverageAnalysis]: Checked inductivity of 67 backedges. 25 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:18,695 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1919108040] [2020-08-19 06:08:18,695 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:18,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 06:08:18,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [591599387] [2020-08-19 06:08:18,696 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 06:08:18,696 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:18,697 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 06:08:18,697 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=72, Unknown=0, NotChecked=0, Total=90 [2020-08-19 06:08:18,697 INFO L87 Difference]: Start difference. First operand 33 states and 41 transitions. Second operand 10 states. [2020-08-19 06:08:18,892 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:18,893 INFO L93 Difference]: Finished difference Result 54 states and 70 transitions. [2020-08-19 06:08:18,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 06:08:18,893 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 32 [2020-08-19 06:08:18,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:18,894 INFO L225 Difference]: With dead ends: 54 [2020-08-19 06:08:18,894 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 06:08:18,895 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=88, Invalid=184, Unknown=0, NotChecked=0, Total=272 [2020-08-19 06:08:18,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 06:08:18,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 34. [2020-08-19 06:08:18,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 34 states. [2020-08-19 06:08:18,902 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 42 transitions. [2020-08-19 06:08:18,903 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 42 transitions. Word has length 32 [2020-08-19 06:08:18,903 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:18,903 INFO L479 AbstractCegarLoop]: Abstraction has 34 states and 42 transitions. [2020-08-19 06:08:18,903 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 06:08:18,904 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 42 transitions. [2020-08-19 06:08:18,904 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2020-08-19 06:08:18,913 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:18,913 INFO L422 BasicCegarLoop]: trace histogram [7, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:18,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 06:08:18,914 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:18,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:18,914 INFO L82 PathProgramCache]: Analyzing trace with hash 1833781516, now seen corresponding path program 10 times [2020-08-19 06:08:18,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:18,915 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2017866984] [2020-08-19 06:08:18,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:18,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:19,010 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:19,011 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:19,014 INFO L134 CoverageAnalysis]: Checked inductivity of 77 backedges. 28 proven. 28 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:19,014 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2017866984] [2020-08-19 06:08:19,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:19,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 06:08:19,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1053193179] [2020-08-19 06:08:19,015 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 06:08:19,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:19,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 06:08:19,016 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=20, Invalid=90, Unknown=0, NotChecked=0, Total=110 [2020-08-19 06:08:19,016 INFO L87 Difference]: Start difference. First operand 34 states and 42 transitions. Second operand 11 states. [2020-08-19 06:08:19,218 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:19,218 INFO L93 Difference]: Finished difference Result 55 states and 71 transitions. [2020-08-19 06:08:19,218 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 06:08:19,218 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 33 [2020-08-19 06:08:19,219 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:19,219 INFO L225 Difference]: With dead ends: 55 [2020-08-19 06:08:19,219 INFO L226 Difference]: Without dead ends: 35 [2020-08-19 06:08:19,220 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=108, Invalid=234, Unknown=0, NotChecked=0, Total=342 [2020-08-19 06:08:19,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2020-08-19 06:08:19,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2020-08-19 06:08:19,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 06:08:19,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 43 transitions. [2020-08-19 06:08:19,226 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 43 transitions. Word has length 33 [2020-08-19 06:08:19,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:19,227 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 43 transitions. [2020-08-19 06:08:19,227 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 06:08:19,227 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 43 transitions. [2020-08-19 06:08:19,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 06:08:19,228 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:19,228 INFO L422 BasicCegarLoop]: trace histogram [8, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:19,228 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 06:08:19,228 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:19,228 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:19,228 INFO L82 PathProgramCache]: Analyzing trace with hash -655531164, now seen corresponding path program 11 times [2020-08-19 06:08:19,229 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:19,229 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [727674763] [2020-08-19 06:08:19,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:19,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:19,346 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:19,347 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:19,351 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 31 proven. 36 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:19,352 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [727674763] [2020-08-19 06:08:19,352 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:19,352 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 06:08:19,352 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680683847] [2020-08-19 06:08:19,353 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 06:08:19,353 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:19,353 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 06:08:19,354 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=22, Invalid=110, Unknown=0, NotChecked=0, Total=132 [2020-08-19 06:08:19,354 INFO L87 Difference]: Start difference. First operand 35 states and 43 transitions. Second operand 12 states. [2020-08-19 06:08:19,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:19,586 INFO L93 Difference]: Finished difference Result 56 states and 72 transitions. [2020-08-19 06:08:19,586 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 06:08:19,586 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 34 [2020-08-19 06:08:19,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:19,587 INFO L225 Difference]: With dead ends: 56 [2020-08-19 06:08:19,587 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 06:08:19,588 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 44 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=130, Invalid=290, Unknown=0, NotChecked=0, Total=420 [2020-08-19 06:08:19,588 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 06:08:19,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2020-08-19 06:08:19,594 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 36 states. [2020-08-19 06:08:19,594 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 44 transitions. [2020-08-19 06:08:19,594 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 44 transitions. Word has length 34 [2020-08-19 06:08:19,595 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:19,595 INFO L479 AbstractCegarLoop]: Abstraction has 36 states and 44 transitions. [2020-08-19 06:08:19,595 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 06:08:19,595 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 44 transitions. [2020-08-19 06:08:19,596 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2020-08-19 06:08:19,596 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:19,596 INFO L422 BasicCegarLoop]: trace histogram [9, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:19,596 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 06:08:19,597 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:19,597 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:19,597 INFO L82 PathProgramCache]: Analyzing trace with hash -514812916, now seen corresponding path program 12 times [2020-08-19 06:08:19,597 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:19,598 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1920114776] [2020-08-19 06:08:19,598 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:19,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:19,713 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:19,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:19,727 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 34 proven. 45 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:19,728 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1920114776] [2020-08-19 06:08:19,728 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:19,729 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 06:08:19,729 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1526578951] [2020-08-19 06:08:19,729 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 06:08:19,729 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:19,730 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 06:08:19,730 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=132, Unknown=0, NotChecked=0, Total=156 [2020-08-19 06:08:19,730 INFO L87 Difference]: Start difference. First operand 36 states and 44 transitions. Second operand 13 states. [2020-08-19 06:08:20,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:20,031 INFO L93 Difference]: Finished difference Result 57 states and 73 transitions. [2020-08-19 06:08:20,032 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 06:08:20,032 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 35 [2020-08-19 06:08:20,033 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:20,033 INFO L225 Difference]: With dead ends: 57 [2020-08-19 06:08:20,033 INFO L226 Difference]: Without dead ends: 37 [2020-08-19 06:08:20,034 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=154, Invalid=352, Unknown=0, NotChecked=0, Total=506 [2020-08-19 06:08:20,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2020-08-19 06:08:20,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2020-08-19 06:08:20,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 06:08:20,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 45 transitions. [2020-08-19 06:08:20,046 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 45 transitions. Word has length 35 [2020-08-19 06:08:20,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:20,049 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 45 transitions. [2020-08-19 06:08:20,049 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 06:08:20,050 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 45 transitions. [2020-08-19 06:08:20,050 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 06:08:20,050 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:20,050 INFO L422 BasicCegarLoop]: trace histogram [10, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:20,051 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 06:08:20,051 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:20,051 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:20,051 INFO L82 PathProgramCache]: Analyzing trace with hash -447514524, now seen corresponding path program 13 times [2020-08-19 06:08:20,051 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:20,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1321563994] [2020-08-19 06:08:20,052 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:20,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:20,174 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:20,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:20,177 INFO L134 CoverageAnalysis]: Checked inductivity of 113 backedges. 37 proven. 55 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:20,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1321563994] [2020-08-19 06:08:20,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:20,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 06:08:20,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [235908702] [2020-08-19 06:08:20,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 06:08:20,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:20,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 06:08:20,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=156, Unknown=0, NotChecked=0, Total=182 [2020-08-19 06:08:20,180 INFO L87 Difference]: Start difference. First operand 37 states and 45 transitions. Second operand 14 states. [2020-08-19 06:08:20,562 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:20,562 INFO L93 Difference]: Finished difference Result 58 states and 74 transitions. [2020-08-19 06:08:20,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 06:08:20,563 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-19 06:08:20,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:20,563 INFO L225 Difference]: With dead ends: 58 [2020-08-19 06:08:20,564 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 06:08:20,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=180, Invalid=420, Unknown=0, NotChecked=0, Total=600 [2020-08-19 06:08:20,572 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 06:08:20,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 38. [2020-08-19 06:08:20,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 38 states. [2020-08-19 06:08:20,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 46 transitions. [2020-08-19 06:08:20,579 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 46 transitions. Word has length 36 [2020-08-19 06:08:20,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:20,579 INFO L479 AbstractCegarLoop]: Abstraction has 38 states and 46 transitions. [2020-08-19 06:08:20,579 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 06:08:20,579 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 46 transitions. [2020-08-19 06:08:20,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2020-08-19 06:08:20,580 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:20,580 INFO L422 BasicCegarLoop]: trace histogram [11, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:20,580 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 06:08:20,581 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:20,581 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:20,581 INFO L82 PathProgramCache]: Analyzing trace with hash 1638735628, now seen corresponding path program 14 times [2020-08-19 06:08:20,581 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:20,581 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1704524137] [2020-08-19 06:08:20,582 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:20,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:20,730 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:20,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:20,734 INFO L134 CoverageAnalysis]: Checked inductivity of 127 backedges. 40 proven. 66 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:20,735 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1704524137] [2020-08-19 06:08:20,735 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:20,735 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 06:08:20,735 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649820973] [2020-08-19 06:08:20,736 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 06:08:20,736 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:20,737 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 06:08:20,737 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=182, Unknown=0, NotChecked=0, Total=210 [2020-08-19 06:08:20,737 INFO L87 Difference]: Start difference. First operand 38 states and 46 transitions. Second operand 15 states. [2020-08-19 06:08:21,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:21,131 INFO L93 Difference]: Finished difference Result 59 states and 75 transitions. [2020-08-19 06:08:21,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 06:08:21,134 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 37 [2020-08-19 06:08:21,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:21,135 INFO L225 Difference]: With dead ends: 59 [2020-08-19 06:08:21,135 INFO L226 Difference]: Without dead ends: 39 [2020-08-19 06:08:21,136 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=208, Invalid=494, Unknown=0, NotChecked=0, Total=702 [2020-08-19 06:08:21,136 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-08-19 06:08:21,142 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-08-19 06:08:21,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 06:08:21,143 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 47 transitions. [2020-08-19 06:08:21,143 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 47 transitions. Word has length 37 [2020-08-19 06:08:21,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:21,144 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 47 transitions. [2020-08-19 06:08:21,144 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 06:08:21,144 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 47 transitions. [2020-08-19 06:08:21,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 06:08:21,145 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:21,145 INFO L422 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:21,145 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 06:08:21,145 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:21,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:21,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1887980900, now seen corresponding path program 15 times [2020-08-19 06:08:21,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:21,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [888217514] [2020-08-19 06:08:21,146 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:21,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:21,333 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:21,333 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:21,337 INFO L134 CoverageAnalysis]: Checked inductivity of 142 backedges. 43 proven. 78 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:21,337 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [888217514] [2020-08-19 06:08:21,337 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:21,337 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 06:08:21,338 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1565263004] [2020-08-19 06:08:21,338 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 06:08:21,338 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:21,338 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 06:08:21,339 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=210, Unknown=0, NotChecked=0, Total=240 [2020-08-19 06:08:21,339 INFO L87 Difference]: Start difference. First operand 39 states and 47 transitions. Second operand 16 states. [2020-08-19 06:08:21,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:21,802 INFO L93 Difference]: Finished difference Result 60 states and 76 transitions. [2020-08-19 06:08:21,803 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 06:08:21,803 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 38 [2020-08-19 06:08:21,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:21,804 INFO L225 Difference]: With dead ends: 60 [2020-08-19 06:08:21,804 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 06:08:21,805 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 90 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=238, Invalid=574, Unknown=0, NotChecked=0, Total=812 [2020-08-19 06:08:21,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 06:08:21,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2020-08-19 06:08:21,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 40 states. [2020-08-19 06:08:21,811 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 48 transitions. [2020-08-19 06:08:21,811 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 48 transitions. Word has length 38 [2020-08-19 06:08:21,812 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:21,812 INFO L479 AbstractCegarLoop]: Abstraction has 40 states and 48 transitions. [2020-08-19 06:08:21,812 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 06:08:21,812 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 48 transitions. [2020-08-19 06:08:21,812 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2020-08-19 06:08:21,813 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:21,813 INFO L422 BasicCegarLoop]: trace histogram [13, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:21,813 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 06:08:21,813 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:21,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:21,814 INFO L82 PathProgramCache]: Analyzing trace with hash 1024649740, now seen corresponding path program 16 times [2020-08-19 06:08:21,814 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:21,814 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [240812007] [2020-08-19 06:08:21,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:21,822 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:22,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:22,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:22,024 INFO L134 CoverageAnalysis]: Checked inductivity of 158 backedges. 46 proven. 91 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:22,025 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [240812007] [2020-08-19 06:08:22,025 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:22,025 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 06:08:22,025 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655584605] [2020-08-19 06:08:22,028 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 06:08:22,028 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:22,028 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 06:08:22,029 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=240, Unknown=0, NotChecked=0, Total=272 [2020-08-19 06:08:22,029 INFO L87 Difference]: Start difference. First operand 40 states and 48 transitions. Second operand 17 states. [2020-08-19 06:08:22,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:22,523 INFO L93 Difference]: Finished difference Result 61 states and 77 transitions. [2020-08-19 06:08:22,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 06:08:22,529 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 39 [2020-08-19 06:08:22,529 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:22,530 INFO L225 Difference]: With dead ends: 61 [2020-08-19 06:08:22,530 INFO L226 Difference]: Without dead ends: 41 [2020-08-19 06:08:22,531 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 104 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=270, Invalid=660, Unknown=0, NotChecked=0, Total=930 [2020-08-19 06:08:22,531 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2020-08-19 06:08:22,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2020-08-19 06:08:22,537 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 06:08:22,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 49 transitions. [2020-08-19 06:08:22,538 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 49 transitions. Word has length 39 [2020-08-19 06:08:22,538 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:22,539 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 49 transitions. [2020-08-19 06:08:22,539 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 06:08:22,539 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 49 transitions. [2020-08-19 06:08:22,539 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2020-08-19 06:08:22,539 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:22,540 INFO L422 BasicCegarLoop]: trace histogram [14, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:22,540 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 06:08:22,540 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:22,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:22,540 INFO L82 PathProgramCache]: Analyzing trace with hash 31187556, now seen corresponding path program 17 times [2020-08-19 06:08:22,541 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:22,541 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [639811164] [2020-08-19 06:08:22,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:22,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:22,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:22,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:22,782 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 49 proven. 105 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:22,782 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [639811164] [2020-08-19 06:08:22,783 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:22,783 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 06:08:22,783 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1800125131] [2020-08-19 06:08:22,783 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 06:08:22,783 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:22,784 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 06:08:22,784 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=272, Unknown=0, NotChecked=0, Total=306 [2020-08-19 06:08:22,784 INFO L87 Difference]: Start difference. First operand 41 states and 49 transitions. Second operand 18 states. [2020-08-19 06:08:23,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:23,337 INFO L93 Difference]: Finished difference Result 62 states and 78 transitions. [2020-08-19 06:08:23,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 06:08:23,338 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 40 [2020-08-19 06:08:23,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:23,339 INFO L225 Difference]: With dead ends: 62 [2020-08-19 06:08:23,339 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 06:08:23,340 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=304, Invalid=752, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 06:08:23,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 06:08:23,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2020-08-19 06:08:23,346 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 42 states. [2020-08-19 06:08:23,346 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 50 transitions. [2020-08-19 06:08:23,346 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 50 transitions. Word has length 40 [2020-08-19 06:08:23,347 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:23,347 INFO L479 AbstractCegarLoop]: Abstraction has 42 states and 50 transitions. [2020-08-19 06:08:23,347 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 06:08:23,347 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 50 transitions. [2020-08-19 06:08:23,347 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 06:08:23,348 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:23,348 INFO L422 BasicCegarLoop]: trace histogram [15, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:23,348 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 06:08:23,348 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:23,348 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:23,349 INFO L82 PathProgramCache]: Analyzing trace with hash -701369076, now seen corresponding path program 18 times [2020-08-19 06:08:23,349 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:23,349 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1346711501] [2020-08-19 06:08:23,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:23,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:23,578 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:23,579 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:23,583 INFO L134 CoverageAnalysis]: Checked inductivity of 193 backedges. 52 proven. 120 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:23,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1346711501] [2020-08-19 06:08:23,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:23,584 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 06:08:23,584 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [207640493] [2020-08-19 06:08:23,585 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 06:08:23,585 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:23,585 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 06:08:23,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=306, Unknown=0, NotChecked=0, Total=342 [2020-08-19 06:08:23,586 INFO L87 Difference]: Start difference. First operand 42 states and 50 transitions. Second operand 19 states. [2020-08-19 06:08:24,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:24,249 INFO L93 Difference]: Finished difference Result 63 states and 79 transitions. [2020-08-19 06:08:24,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 06:08:24,249 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 41 [2020-08-19 06:08:24,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:24,250 INFO L225 Difference]: With dead ends: 63 [2020-08-19 06:08:24,250 INFO L226 Difference]: Without dead ends: 43 [2020-08-19 06:08:24,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=340, Invalid=850, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 06:08:24,251 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2020-08-19 06:08:24,256 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2020-08-19 06:08:24,257 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 06:08:24,257 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 51 transitions. [2020-08-19 06:08:24,257 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 51 transitions. Word has length 41 [2020-08-19 06:08:24,258 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:24,258 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 51 transitions. [2020-08-19 06:08:24,258 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 06:08:24,258 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 51 transitions. [2020-08-19 06:08:24,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2020-08-19 06:08:24,258 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:24,259 INFO L422 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:24,259 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 06:08:24,259 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:24,259 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:24,259 INFO L82 PathProgramCache]: Analyzing trace with hash -1935788188, now seen corresponding path program 19 times [2020-08-19 06:08:24,259 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:24,260 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1947044094] [2020-08-19 06:08:24,260 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:24,267 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:24,524 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:24,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:24,531 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 55 proven. 136 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:24,532 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1947044094] [2020-08-19 06:08:24,532 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:24,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 06:08:24,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1284317709] [2020-08-19 06:08:24,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 06:08:24,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:24,533 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 06:08:24,533 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=342, Unknown=0, NotChecked=0, Total=380 [2020-08-19 06:08:24,533 INFO L87 Difference]: Start difference. First operand 43 states and 51 transitions. Second operand 20 states. [2020-08-19 06:08:25,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:25,238 INFO L93 Difference]: Finished difference Result 64 states and 80 transitions. [2020-08-19 06:08:25,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 06:08:25,241 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 42 [2020-08-19 06:08:25,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:25,241 INFO L225 Difference]: With dead ends: 64 [2020-08-19 06:08:25,241 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 06:08:25,242 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=378, Invalid=954, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 06:08:25,243 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 06:08:25,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2020-08-19 06:08:25,248 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 44 states. [2020-08-19 06:08:25,249 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 52 transitions. [2020-08-19 06:08:25,249 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 52 transitions. Word has length 42 [2020-08-19 06:08:25,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:25,249 INFO L479 AbstractCegarLoop]: Abstraction has 44 states and 52 transitions. [2020-08-19 06:08:25,250 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 06:08:25,250 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 52 transitions. [2020-08-19 06:08:25,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2020-08-19 06:08:25,250 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:25,250 INFO L422 BasicCegarLoop]: trace histogram [17, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:25,251 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 06:08:25,251 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:25,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:25,251 INFO L82 PathProgramCache]: Analyzing trace with hash -1548074996, now seen corresponding path program 20 times [2020-08-19 06:08:25,251 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:25,251 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [436104595] [2020-08-19 06:08:25,252 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:25,259 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:25,520 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:25,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:25,524 INFO L134 CoverageAnalysis]: Checked inductivity of 232 backedges. 58 proven. 153 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:25,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [436104595] [2020-08-19 06:08:25,525 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:25,525 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 06:08:25,525 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381454021] [2020-08-19 06:08:25,526 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 06:08:25,526 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:25,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 06:08:25,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=380, Unknown=0, NotChecked=0, Total=420 [2020-08-19 06:08:25,527 INFO L87 Difference]: Start difference. First operand 44 states and 52 transitions. Second operand 21 states. [2020-08-19 06:08:26,353 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:26,353 INFO L93 Difference]: Finished difference Result 65 states and 81 transitions. [2020-08-19 06:08:26,354 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 06:08:26,354 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 43 [2020-08-19 06:08:26,354 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:26,355 INFO L225 Difference]: With dead ends: 65 [2020-08-19 06:08:26,355 INFO L226 Difference]: Without dead ends: 45 [2020-08-19 06:08:26,356 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=418, Invalid=1064, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 06:08:26,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2020-08-19 06:08:26,362 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 45. [2020-08-19 06:08:26,363 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 06:08:26,363 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 53 transitions. [2020-08-19 06:08:26,363 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 53 transitions. Word has length 43 [2020-08-19 06:08:26,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:26,364 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 53 transitions. [2020-08-19 06:08:26,364 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 06:08:26,364 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 53 transitions. [2020-08-19 06:08:26,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 06:08:26,365 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:26,365 INFO L422 BasicCegarLoop]: trace histogram [18, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:26,365 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 06:08:26,365 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:26,365 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:26,365 INFO L82 PathProgramCache]: Analyzing trace with hash 1881099364, now seen corresponding path program 21 times [2020-08-19 06:08:26,366 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:26,366 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1889136485] [2020-08-19 06:08:26,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:26,374 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:26,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:26,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:26,675 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 61 proven. 171 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:26,675 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1889136485] [2020-08-19 06:08:26,675 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:26,676 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 06:08:26,676 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1645627712] [2020-08-19 06:08:26,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 06:08:26,677 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:26,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 06:08:26,678 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=420, Unknown=0, NotChecked=0, Total=462 [2020-08-19 06:08:26,678 INFO L87 Difference]: Start difference. First operand 45 states and 53 transitions. Second operand 22 states. [2020-08-19 06:08:27,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:27,540 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-19 06:08:27,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 06:08:27,540 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 44 [2020-08-19 06:08:27,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:27,541 INFO L225 Difference]: With dead ends: 66 [2020-08-19 06:08:27,542 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 06:08:27,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 189 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=460, Invalid=1180, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 06:08:27,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 06:08:27,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 46. [2020-08-19 06:08:27,549 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 06:08:27,549 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 54 transitions. [2020-08-19 06:08:27,549 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 54 transitions. Word has length 44 [2020-08-19 06:08:27,549 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:27,550 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 54 transitions. [2020-08-19 06:08:27,550 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 06:08:27,550 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 54 transitions. [2020-08-19 06:08:27,550 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2020-08-19 06:08:27,550 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:27,550 INFO L422 BasicCegarLoop]: trace histogram [19, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:27,550 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 06:08:27,551 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:27,551 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:27,551 INFO L82 PathProgramCache]: Analyzing trace with hash 811322124, now seen corresponding path program 22 times [2020-08-19 06:08:27,551 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:27,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1917695906] [2020-08-19 06:08:27,552 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:27,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:27,874 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:27,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:27,878 INFO L134 CoverageAnalysis]: Checked inductivity of 275 backedges. 64 proven. 190 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:27,878 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1917695906] [2020-08-19 06:08:27,879 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:27,879 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 06:08:27,879 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1040912108] [2020-08-19 06:08:27,879 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 06:08:27,879 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:27,880 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 06:08:27,880 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=462, Unknown=0, NotChecked=0, Total=506 [2020-08-19 06:08:27,880 INFO L87 Difference]: Start difference. First operand 46 states and 54 transitions. Second operand 23 states. [2020-08-19 06:08:28,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:28,908 INFO L93 Difference]: Finished difference Result 67 states and 83 transitions. [2020-08-19 06:08:28,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 06:08:28,908 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 45 [2020-08-19 06:08:28,908 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:28,909 INFO L225 Difference]: With dead ends: 67 [2020-08-19 06:08:28,909 INFO L226 Difference]: Without dead ends: 47 [2020-08-19 06:08:28,910 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 209 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=504, Invalid=1302, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 06:08:28,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2020-08-19 06:08:28,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2020-08-19 06:08:28,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 47 states. [2020-08-19 06:08:28,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 55 transitions. [2020-08-19 06:08:28,917 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 55 transitions. Word has length 45 [2020-08-19 06:08:28,917 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:28,918 INFO L479 AbstractCegarLoop]: Abstraction has 47 states and 55 transitions. [2020-08-19 06:08:28,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 06:08:28,918 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 55 transitions. [2020-08-19 06:08:28,918 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 06:08:28,918 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:28,919 INFO L422 BasicCegarLoop]: trace histogram [20, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:28,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 06:08:28,919 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:28,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:28,919 INFO L82 PathProgramCache]: Analyzing trace with hash 2007966052, now seen corresponding path program 23 times [2020-08-19 06:08:28,919 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:28,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [558443731] [2020-08-19 06:08:28,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:28,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:29,264 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:29,265 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:29,269 INFO L134 CoverageAnalysis]: Checked inductivity of 298 backedges. 67 proven. 210 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:29,269 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [558443731] [2020-08-19 06:08:29,269 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:29,269 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 06:08:29,270 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1237956601] [2020-08-19 06:08:29,270 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 06:08:29,270 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:29,270 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 06:08:29,271 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=506, Unknown=0, NotChecked=0, Total=552 [2020-08-19 06:08:29,271 INFO L87 Difference]: Start difference. First operand 47 states and 55 transitions. Second operand 24 states. [2020-08-19 06:08:30,334 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:30,334 INFO L93 Difference]: Finished difference Result 68 states and 84 transitions. [2020-08-19 06:08:30,336 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 06:08:30,337 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 46 [2020-08-19 06:08:30,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:30,337 INFO L225 Difference]: With dead ends: 68 [2020-08-19 06:08:30,338 INFO L226 Difference]: Without dead ends: 48 [2020-08-19 06:08:30,339 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 230 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=550, Invalid=1430, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 06:08:30,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2020-08-19 06:08:30,345 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 48. [2020-08-19 06:08:30,345 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 48 states. [2020-08-19 06:08:30,345 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 56 transitions. [2020-08-19 06:08:30,346 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 56 transitions. Word has length 46 [2020-08-19 06:08:30,346 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:30,346 INFO L479 AbstractCegarLoop]: Abstraction has 48 states and 56 transitions. [2020-08-19 06:08:30,346 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 06:08:30,346 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 56 transitions. [2020-08-19 06:08:30,346 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2020-08-19 06:08:30,347 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:30,347 INFO L422 BasicCegarLoop]: trace histogram [21, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:30,347 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 06:08:30,347 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:30,347 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:30,347 INFO L82 PathProgramCache]: Analyzing trace with hash 449222156, now seen corresponding path program 24 times [2020-08-19 06:08:30,348 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:30,348 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [309822278] [2020-08-19 06:08:30,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:30,361 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:30,716 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:30,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:30,721 INFO L134 CoverageAnalysis]: Checked inductivity of 322 backedges. 70 proven. 231 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2020-08-19 06:08:30,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [309822278] [2020-08-19 06:08:30,721 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 06:08:30,721 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 06:08:30,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709078663] [2020-08-19 06:08:30,722 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 06:08:30,722 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:30,722 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 06:08:30,723 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=552, Unknown=0, NotChecked=0, Total=600 [2020-08-19 06:08:30,723 INFO L87 Difference]: Start difference. First operand 48 states and 56 transitions. Second operand 25 states. [2020-08-19 06:08:31,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:31,904 INFO L93 Difference]: Finished difference Result 69 states and 85 transitions. [2020-08-19 06:08:31,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 06:08:31,905 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 47 [2020-08-19 06:08:31,905 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:31,906 INFO L225 Difference]: With dead ends: 69 [2020-08-19 06:08:31,906 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 06:08:31,908 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 252 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=598, Invalid=1564, Unknown=0, NotChecked=0, Total=2162 [2020-08-19 06:08:31,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 06:08:31,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 06:08:31,915 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 06:08:31,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 57 transitions. [2020-08-19 06:08:31,916 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 57 transitions. Word has length 47 [2020-08-19 06:08:31,916 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:31,916 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 57 transitions. [2020-08-19 06:08:31,916 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 06:08:31,916 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 57 transitions. [2020-08-19 06:08:31,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 06:08:31,917 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 06:08:31,917 INFO L422 BasicCegarLoop]: trace histogram [22, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-19 06:08:31,917 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 06:08:31,917 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 06:08:31,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 06:08:31,918 INFO L82 PathProgramCache]: Analyzing trace with hash -627198364, now seen corresponding path program 25 times [2020-08-19 06:08:31,918 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 06:08:31,918 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [129602680] [2020-08-19 06:08:31,918 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 06:08:31,929 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:31,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 06:08:31,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 06:08:31,966 INFO L134 CoverageAnalysis]: Checked inductivity of 347 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 340 trivial. 0 not checked. [2020-08-19 06:08:31,967 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [129602680] [2020-08-19 06:08:31,967 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 06:08:31,967 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 06:08:31,967 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405041483] [2020-08-19 06:08:31,968 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 06:08:31,968 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 06:08:31,968 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 06:08:31,968 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 06:08:31,968 INFO L87 Difference]: Start difference. First operand 49 states and 57 transitions. Second operand 5 states. [2020-08-19 06:08:31,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 06:08:31,990 INFO L93 Difference]: Finished difference Result 66 states and 82 transitions. [2020-08-19 06:08:31,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 06:08:31,990 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 48 [2020-08-19 06:08:31,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 06:08:31,990 INFO L225 Difference]: With dead ends: 66 [2020-08-19 06:08:31,990 INFO L226 Difference]: Without dead ends: 0 [2020-08-19 06:08:31,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-19 06:08:31,991 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2020-08-19 06:08:31,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2020-08-19 06:08:31,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 0 states. [2020-08-19 06:08:31,991 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2020-08-19 06:08:31,991 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 48 [2020-08-19 06:08:31,991 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 06:08:31,991 INFO L479 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2020-08-19 06:08:31,991 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 06:08:31,992 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2020-08-19 06:08:31,992 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2020-08-19 06:08:31,992 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 06:08:31,994 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2020-08-19 06:08:32,177 INFO L271 CegarLoopResult]: At program point ULTIMATE.initFINAL(line -1) the Hoare annotation is: true [2020-08-19 06:08:32,177 INFO L268 CegarLoopResult]: For program point ULTIMATE.initEXIT(line -1) no Hoare annotation was computed. [2020-08-19 06:08:32,177 INFO L268 CegarLoopResult]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2020-08-19 06:08:32,177 INFO L271 CegarLoopResult]: At program point L-1(line -1) the Hoare annotation is: true [2020-08-19 06:08:32,178 INFO L271 CegarLoopResult]: At program point ULTIMATE.startENTRY(line -1) the Hoare annotation is: true [2020-08-19 06:08:32,178 INFO L268 CegarLoopResult]: For program point ULTIMATE.startFINAL(line -1) no Hoare annotation was computed. [2020-08-19 06:08:32,178 INFO L268 CegarLoopResult]: For program point assume_abort_if_notENTRY(lines 3 5) no Hoare annotation was computed. [2020-08-19 06:08:32,178 INFO L268 CegarLoopResult]: For program point L4(line 4) no Hoare annotation was computed. [2020-08-19 06:08:32,178 INFO L268 CegarLoopResult]: For program point L4-2(lines 3 5) no Hoare annotation was computed. [2020-08-19 06:08:32,178 INFO L268 CegarLoopResult]: For program point assume_abort_if_notEXIT(lines 3 5) no Hoare annotation was computed. [2020-08-19 06:08:32,178 INFO L268 CegarLoopResult]: For program point mainEXIT(lines 13 30) no Hoare annotation was computed. [2020-08-19 06:08:32,178 INFO L268 CegarLoopResult]: For program point mainFINAL(lines 13 30) no Hoare annotation was computed. [2020-08-19 06:08:32,178 INFO L271 CegarLoopResult]: At program point mainENTRY(lines 13 30) the Hoare annotation is: true [2020-08-19 06:08:32,178 INFO L268 CegarLoopResult]: For program point L28(line 28) no Hoare annotation was computed. [2020-08-19 06:08:32,179 INFO L264 CegarLoopResult]: At program point L24-2(lines 24 26) the Hoare annotation is: (= main_~k~0 4) [2020-08-19 06:08:32,179 INFO L264 CegarLoopResult]: At program point L24-3(lines 18 27) the Hoare annotation is: (or (= main_~k~0 4) (and (<= main_~i~0 0) (<= (+ main_~j~0 100) 0))) [2020-08-19 06:08:32,179 INFO L264 CegarLoopResult]: At program point L20-2(lines 20 22) the Hoare annotation is: (or (= main_~k~0 4) (<= main_~i~0 1)) [2020-08-19 06:08:32,179 INFO L268 CegarLoopResult]: For program point L20-3(lines 20 22) no Hoare annotation was computed. [2020-08-19 06:08:32,179 INFO L264 CegarLoopResult]: At program point L18-2(lines 18 27) the Hoare annotation is: (= main_~k~0 4) [2020-08-19 06:08:32,180 INFO L271 CegarLoopResult]: At program point __VERIFIER_assertENTRY(lines 6 11) the Hoare annotation is: true [2020-08-19 06:08:32,180 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertEXIT(lines 6 11) no Hoare annotation was computed. [2020-08-19 06:08:32,180 INFO L268 CegarLoopResult]: For program point L8(line 8) no Hoare annotation was computed. [2020-08-19 06:08:32,180 INFO L268 CegarLoopResult]: For program point L7(lines 7 9) no Hoare annotation was computed. [2020-08-19 06:08:32,180 INFO L268 CegarLoopResult]: For program point L7-2(lines 6 11) no Hoare annotation was computed. [2020-08-19 06:08:32,181 INFO L268 CegarLoopResult]: For program point __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION(line 8) no Hoare annotation was computed. [2020-08-19 06:08:32,201 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 19.08 06:08:32 BoogieIcfgContainer [2020-08-19 06:08:32,201 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-08-19 06:08:32,204 INFO L168 Benchmark]: Toolchain (without parser) took 16017.54 ms. Allocated memory was 140.5 MB in the beginning and 355.5 MB in the end (delta: 215.0 MB). Free memory was 102.2 MB in the beginning and 177.2 MB in the end (delta: -74.9 MB). Peak memory consumption was 140.0 MB. Max. memory is 7.1 GB. [2020-08-19 06:08:32,204 INFO L168 Benchmark]: CDTParser took 0.22 ms. Allocated memory is still 140.5 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. [2020-08-19 06:08:32,205 INFO L168 Benchmark]: CACSL2BoogieTranslator took 230.74 ms. Allocated memory is still 140.5 MB. Free memory was 102.0 MB in the beginning and 92.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. [2020-08-19 06:08:32,206 INFO L168 Benchmark]: Boogie Preprocessor took 105.85 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 92.6 MB in the beginning and 182.1 MB in the end (delta: -89.4 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. [2020-08-19 06:08:32,206 INFO L168 Benchmark]: RCFGBuilder took 264.54 ms. Allocated memory is still 203.9 MB. Free memory was 182.1 MB in the beginning and 169.8 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. [2020-08-19 06:08:32,207 INFO L168 Benchmark]: TraceAbstraction took 15410.66 ms. Allocated memory was 203.9 MB in the beginning and 355.5 MB in the end (delta: 151.5 MB). Free memory was 169.8 MB in the beginning and 177.2 MB in the end (delta: -7.4 MB). Peak memory consumption was 144.1 MB. Max. memory is 7.1 GB. [2020-08-19 06:08:32,210 INFO L336 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.22 ms. Allocated memory is still 140.5 MB. Free memory was 120.8 MB in the beginning and 120.6 MB in the end (delta: 209.8 kB). There was no memory consumed. Max. memory is 7.1 GB. * CACSL2BoogieTranslator took 230.74 ms. Allocated memory is still 140.5 MB. Free memory was 102.0 MB in the beginning and 92.6 MB in the end (delta: 9.4 MB). Peak memory consumption was 9.4 MB. Max. memory is 7.1 GB. * Boogie Preprocessor took 105.85 ms. Allocated memory was 140.5 MB in the beginning and 203.9 MB in the end (delta: 63.4 MB). Free memory was 92.6 MB in the beginning and 182.1 MB in the end (delta: -89.4 MB). Peak memory consumption was 12.9 MB. Max. memory is 7.1 GB. * RCFGBuilder took 264.54 ms. Allocated memory is still 203.9 MB. Free memory was 182.1 MB in the beginning and 169.8 MB in the end (delta: 12.3 MB). Peak memory consumption was 12.3 MB. Max. memory is 7.1 GB. * TraceAbstraction took 15410.66 ms. Allocated memory was 203.9 MB in the beginning and 355.5 MB in the end (delta: 151.5 MB). Free memory was 169.8 MB in the beginning and 177.2 MB in the end (delta: -7.4 MB). Peak memory consumption was 144.1 MB. Max. memory is 7.1 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - PositiveResult [Line: 8]: call of __VERIFIER_error() unreachable For all program executions holds that call of __VERIFIER_error() unreachable at this location - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 24]: Loop Invariant Derived loop invariant: k == 4 - InvariantResult [Line: 20]: Loop Invariant Derived loop invariant: k == 4 || i <= 1 - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: k == 4 || (i <= 0 && j + 100 <= 0) - StatisticsResult: Ultimate Automizer benchmark data CFG has 5 procedures, 25 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: SAFE, OverallTime: 15.1s, OverallIterations: 28, TraceHistogramMax: 22, AutomataDifference: 10.3s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.1s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 404 SDtfs, 15 SDslu, 3185 SDs, 0 SdLazy, 1131 SolverSat, 487 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 1.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 652 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 540 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2002 ImplicationChecksByTransitivity, 11.7s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=49occurred in iteration=27, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.1s AutomataMinimizationTime, 28 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 9 LocationsWithAnnotation, 37 PreInvPairs, 73 NumberOfFragments, 31 HoareAnnotationTreeSize, 37 FomulaSimplifications, 3216 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 9 FomulaSimplificationsInter, 271 FormulaSimplificationTreeSizeReductionInter, 0.1s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 3.8s InterpolantComputationTime, 871 NumberOfCodeBlocks, 871 NumberOfCodeBlocksAsserted, 28 NumberOfCheckSat, 843 ConstructedInterpolants, 0 QuantifiedInterpolants, 100903 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 28 InterpolantComputations, 4 PerfectInterpolantSequences, 1512/3323 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be correct! Received shutdown request...