/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=SHALLOWEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 20:24:44,610 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 20:24:44,614 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 20:24:44,652 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 20:24:44,652 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 20:24:44,662 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 20:24:44,664 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 20:24:44,667 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 20:24:44,670 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 20:24:44,673 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 20:24:44,674 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 20:24:44,675 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 20:24:44,675 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 20:24:44,678 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 20:24:44,680 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 20:24:44,682 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 20:24:44,683 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 20:24:44,684 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 20:24:44,686 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 20:24:44,693 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 20:24:44,696 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 20:24:44,697 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 20:24:44,698 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 20:24:44,698 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 20:24:44,717 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 20:24:44,730 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 20:24:44,732 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 20:24:44,732 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 20:24:44,734 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 20:24:44,762 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 20:24:44,762 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 20:24:44,764 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 20:24:44,764 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 20:24:44,764 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 20:24:44,764 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 20:24:44,765 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 20:24:44,765 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 20:24:44,765 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 20:24:44,765 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 20:24:44,765 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 20:24:44,766 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 20:24:44,766 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 20:24:44,766 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 20:24:44,766 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 20:24:44,766 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 20:24:44,767 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 20:24:44,767 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 20:24:44,767 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 20:24:44,767 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 20:24:44,767 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 20:24:44,768 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:24:44,768 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 20:24:44,768 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 20:24:44,768 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 20:24:44,768 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 20:24:44,769 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 20:24:44,769 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 20:24:44,769 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 20:24:44,769 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=SHALLOWEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=SHALLOWEST; [2020-08-18 20:24:45,106 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 20:24:45,125 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 20:24:45,129 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 20:24:45,130 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 20:24:45,131 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 20:24:45,132 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 20:24:45,197 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/df4b23220/5fc270a6f504463da2973cc3cb7f2628/FLAG82cf3729b [2020-08-18 20:24:45,645 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 20:24:45,646 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 20:24:45,653 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/df4b23220/5fc270a6f504463da2973cc3cb7f2628/FLAG82cf3729b [2020-08-18 20:24:46,054 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/df4b23220/5fc270a6f504463da2973cc3cb7f2628 [2020-08-18 20:24:46,067 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 20:24:46,069 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 20:24:46,075 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 20:24:46,075 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 20:24:46,084 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 20:24:46,086 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:24:46" (1/1) ... [2020-08-18 20:24:46,089 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@d5d5e76 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:46, skipping insertion in model container [2020-08-18 20:24:46,089 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 08:24:46" (1/1) ... [2020-08-18 20:24:46,097 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 20:24:46,116 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 20:24:46,302 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:24:46,309 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 20:24:46,330 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 20:24:46,346 INFO L208 MainTranslator]: Completed translation [2020-08-18 20:24:46,347 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:46 WrapperNode [2020-08-18 20:24:46,347 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 20:24:46,348 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 20:24:46,348 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 20:24:46,348 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 20:24:46,446 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:46" (1/1) ... [2020-08-18 20:24:46,447 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:46" (1/1) ... [2020-08-18 20:24:46,457 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:46" (1/1) ... [2020-08-18 20:24:46,458 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:46" (1/1) ... [2020-08-18 20:24:46,466 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:46" (1/1) ... [2020-08-18 20:24:46,472 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:46" (1/1) ... [2020-08-18 20:24:46,473 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:46" (1/1) ... [2020-08-18 20:24:46,476 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 20:24:46,476 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 20:24:46,476 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 20:24:46,477 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 20:24:46,478 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:46" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 20:24:46,547 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 20:24:46,548 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 20:24:46,548 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 20:24:46,548 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-18 20:24:46,548 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 20:24:46,548 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 20:24:46,548 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 20:24:46,549 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 20:24:46,549 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-18 20:24:46,549 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 20:24:46,549 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 20:24:46,549 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 20:24:46,549 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 20:24:46,550 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 20:24:46,550 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 20:24:46,550 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 20:24:46,550 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 20:24:46,550 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 20:24:46,826 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 20:24:46,826 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 20:24:46,830 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:24:46 BoogieIcfgContainer [2020-08-18 20:24:46,831 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 20:24:46,832 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 20:24:46,832 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 20:24:46,835 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 20:24:46,836 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 08:24:46" (1/3) ... [2020-08-18 20:24:46,836 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f9c4466 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:24:46, skipping insertion in model container [2020-08-18 20:24:46,837 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 08:24:46" (2/3) ... [2020-08-18 20:24:46,837 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@f9c4466 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 08:24:46, skipping insertion in model container [2020-08-18 20:24:46,837 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 08:24:46" (3/3) ... [2020-08-18 20:24:46,839 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-18 20:24:46,851 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 20:24:46,859 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 20:24:46,878 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 20:24:46,942 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 20:24:46,942 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 20:24:46,942 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 20:24:46,943 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 20:24:46,945 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 20:24:46,945 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 20:24:46,945 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 20:24:46,945 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 20:24:46,966 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-18 20:24:46,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 20:24:46,980 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:46,981 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:46,982 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:46,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:46,987 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-18 20:24:46,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:46,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2033848654] [2020-08-18 20:24:46,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:47,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,163 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:47,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,189 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:47,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,205 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:47,206 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2033848654] [2020-08-18 20:24:47,213 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:24:47,213 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 20:24:47,217 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2114998153] [2020-08-18 20:24:47,224 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 20:24:47,225 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:47,239 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 20:24:47,240 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 20:24:47,242 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-18 20:24:47,402 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:47,402 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-18 20:24:47,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 20:24:47,405 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 20:24:47,405 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:47,417 INFO L225 Difference]: With dead ends: 59 [2020-08-18 20:24:47,417 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 20:24:47,421 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:24:47,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 20:24:47,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 20:24:47,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 20:24:47,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 20:24:47,461 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-18 20:24:47,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:47,461 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 20:24:47,462 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 20:24:47,462 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 20:24:47,463 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 20:24:47,463 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:47,463 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:47,463 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 20:24:47,464 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:47,464 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:47,464 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-18 20:24:47,465 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:47,465 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [938703654] [2020-08-18 20:24:47,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:47,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,542 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:47,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,564 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:47,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,654 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:47,655 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [938703654] [2020-08-18 20:24:47,655 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:24:47,655 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 20:24:47,656 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317045434] [2020-08-18 20:24:47,658 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:24:47,658 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:47,658 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:24:47,659 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:24:47,659 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 20:24:47,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:47,866 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-18 20:24:47,866 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 20:24:47,867 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-18 20:24:47,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:47,868 INFO L225 Difference]: With dead ends: 48 [2020-08-18 20:24:47,868 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 20:24:47,870 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=45, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:24:47,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 20:24:47,877 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 20:24:47,878 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 20:24:47,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-18 20:24:47,879 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-18 20:24:47,880 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:47,880 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-18 20:24:47,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:24:47,880 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-18 20:24:47,881 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 20:24:47,881 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:47,882 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:47,882 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 20:24:47,882 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:47,883 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:47,883 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-18 20:24:47,883 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:47,884 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [882066147] [2020-08-18 20:24:47,884 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:47,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:47,962 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:47,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:48,003 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:48,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:48,106 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:48,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [882066147] [2020-08-18 20:24:48,107 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:48,107 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 20:24:48,107 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1324577328] [2020-08-18 20:24:48,108 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 20:24:48,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:48,109 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 20:24:48,109 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:24:48,109 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-18 20:24:48,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:48,302 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-18 20:24:48,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 20:24:48,303 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-18 20:24:48,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:48,304 INFO L225 Difference]: With dead ends: 50 [2020-08-18 20:24:48,304 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 20:24:48,305 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=28, Invalid=62, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:24:48,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 20:24:48,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 20:24:48,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 20:24:48,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-18 20:24:48,313 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-18 20:24:48,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:48,314 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-18 20:24:48,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 20:24:48,314 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-18 20:24:48,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 20:24:48,315 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:48,315 INFO L422 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:48,315 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 20:24:48,316 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:48,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:48,316 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-18 20:24:48,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:48,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2052118345] [2020-08-18 20:24:48,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:48,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:48,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:48,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:48,384 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:48,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:48,540 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:48,541 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2052118345] [2020-08-18 20:24:48,541 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:48,541 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 20:24:48,542 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [257726735] [2020-08-18 20:24:48,542 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 20:24:48,543 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:48,543 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 20:24:48,543 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-18 20:24:48,544 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-18 20:24:48,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:48,746 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-18 20:24:48,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 20:24:48,747 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-18 20:24:48,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:48,748 INFO L225 Difference]: With dead ends: 52 [2020-08-18 20:24:48,748 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 20:24:48,750 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:24:48,750 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 20:24:48,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 20:24:48,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 20:24:48,763 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-18 20:24:48,763 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-18 20:24:48,764 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:48,764 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-18 20:24:48,764 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 20:24:48,764 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-18 20:24:48,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 20:24:48,766 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:48,766 INFO L422 BasicCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:48,766 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 20:24:48,767 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:48,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:48,767 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-18 20:24:48,767 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:48,768 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [861689843] [2020-08-18 20:24:48,768 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:48,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:48,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:48,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:48,873 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:48,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:49,035 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:49,035 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [861689843] [2020-08-18 20:24:49,036 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:49,036 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 20:24:49,036 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1719786369] [2020-08-18 20:24:49,037 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 20:24:49,037 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:49,037 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 20:24:49,038 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 20:24:49,038 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-18 20:24:49,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:49,238 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-18 20:24:49,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 20:24:49,239 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-18 20:24:49,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:49,240 INFO L225 Difference]: With dead ends: 54 [2020-08-18 20:24:49,240 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 20:24:49,241 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 14 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=41, Invalid=91, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:24:49,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 20:24:49,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 20:24:49,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 20:24:49,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-18 20:24:49,247 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-18 20:24:49,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:49,247 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-18 20:24:49,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 20:24:49,248 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-18 20:24:49,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 20:24:49,249 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:49,249 INFO L422 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:49,249 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 20:24:49,249 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:49,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:49,250 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-18 20:24:49,250 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:49,250 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1463067178] [2020-08-18 20:24:49,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:49,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:49,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:49,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:49,298 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:49,305 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:49,476 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:49,477 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1463067178] [2020-08-18 20:24:49,477 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:49,477 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 20:24:49,477 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [567089316] [2020-08-18 20:24:49,478 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 20:24:49,478 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:49,478 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 20:24:49,479 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-18 20:24:49,479 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-18 20:24:49,664 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:49,665 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-18 20:24:49,665 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 20:24:49,665 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-18 20:24:49,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:49,666 INFO L225 Difference]: With dead ends: 56 [2020-08-18 20:24:49,666 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 20:24:49,667 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=107, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:24:49,668 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 20:24:49,675 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 20:24:49,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 20:24:49,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-18 20:24:49,676 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-18 20:24:49,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:49,677 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-18 20:24:49,679 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 20:24:49,679 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-18 20:24:49,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 20:24:49,680 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:49,680 INFO L422 BasicCegarLoop]: trace histogram [5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:49,681 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 20:24:49,681 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:49,681 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:49,681 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-18 20:24:49,682 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:49,682 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1437324338] [2020-08-18 20:24:49,682 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:49,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:49,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:49,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:49,756 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:49,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,014 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:50,015 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1437324338] [2020-08-18 20:24:50,015 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:50,015 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 20:24:50,015 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1338107859] [2020-08-18 20:24:50,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 20:24:50,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:50,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 20:24:50,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 20:24:50,017 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-18 20:24:50,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:50,225 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-18 20:24:50,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 20:24:50,226 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 20:24:50,226 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:50,227 INFO L225 Difference]: With dead ends: 58 [2020-08-18 20:24:50,227 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 20:24:50,228 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=124, Unknown=0, NotChecked=0, Total=182 [2020-08-18 20:24:50,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 20:24:50,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 20:24:50,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 20:24:50,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 20:24:50,234 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-18 20:24:50,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:50,234 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 20:24:50,234 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 20:24:50,235 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 20:24:50,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 20:24:50,235 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:50,236 INFO L422 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:50,236 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 20:24:50,236 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:50,236 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:50,236 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-18 20:24:50,237 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:50,237 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [142444502] [2020-08-18 20:24:50,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:50,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,265 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:50,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:50,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,511 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:50,512 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [142444502] [2020-08-18 20:24:50,512 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:50,512 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 20:24:50,512 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [175062879] [2020-08-18 20:24:50,513 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 20:24:50,513 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:50,513 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 20:24:50,514 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-18 20:24:50,514 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-18 20:24:50,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:50,727 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-18 20:24:50,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 20:24:50,728 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-18 20:24:50,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:50,729 INFO L225 Difference]: With dead ends: 60 [2020-08-18 20:24:50,729 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 20:24:50,730 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:24:50,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 20:24:50,735 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 20:24:50,735 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 20:24:50,736 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 20:24:50,736 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-18 20:24:50,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:50,736 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 20:24:50,737 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 20:24:50,737 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 20:24:50,738 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 20:24:50,738 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:50,739 INFO L422 BasicCegarLoop]: trace histogram [7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:50,739 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 20:24:50,740 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:50,740 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:50,742 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-18 20:24:50,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:50,742 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2130762106] [2020-08-18 20:24:50,742 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:50,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,784 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:50,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:50,803 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:50,818 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:51,163 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:51,164 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2130762106] [2020-08-18 20:24:51,164 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:51,165 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 20:24:51,169 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796181747] [2020-08-18 20:24:51,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 20:24:51,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:51,174 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 20:24:51,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-18 20:24:51,174 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-18 20:24:51,416 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:51,416 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-18 20:24:51,417 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 20:24:51,417 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-18 20:24:51,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:51,418 INFO L225 Difference]: With dead ends: 62 [2020-08-18 20:24:51,418 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 20:24:51,419 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 18 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=79, Invalid=161, Unknown=0, NotChecked=0, Total=240 [2020-08-18 20:24:51,419 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 20:24:51,428 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 20:24:51,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 20:24:51,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-18 20:24:51,429 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-18 20:24:51,429 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:51,429 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-18 20:24:51,429 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 20:24:51,430 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-18 20:24:51,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 20:24:51,434 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:51,434 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:51,434 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 20:24:51,434 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:51,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:51,437 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-18 20:24:51,437 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:51,437 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [445724769] [2020-08-18 20:24:51,437 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:51,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:51,482 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:51,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:51,494 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:51,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:51,832 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 20:24:51,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [445724769] [2020-08-18 20:24:51,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:51,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 20:24:51,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [385695224] [2020-08-18 20:24:51,835 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 20:24:51,835 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:51,836 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 20:24:51,836 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-18 20:24:51,836 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-18 20:24:52,066 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:52,066 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-18 20:24:52,067 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 20:24:52,067 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 20:24:52,067 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:52,068 INFO L225 Difference]: With dead ends: 64 [2020-08-18 20:24:52,068 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 20:24:52,069 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=91, Invalid=181, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:24:52,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 20:24:52,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 20:24:52,076 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 20:24:52,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-18 20:24:52,077 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-18 20:24:52,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:52,077 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-18 20:24:52,077 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 20:24:52,078 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-18 20:24:52,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 20:24:52,078 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:52,078 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:52,079 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 20:24:52,079 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:52,079 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:52,079 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-18 20:24:52,080 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:52,080 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [191333050] [2020-08-18 20:24:52,080 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:52,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,136 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:52,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,151 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:52,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,171 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 20:24:52,171 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [191333050] [2020-08-18 20:24:52,171 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:24:52,172 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 20:24:52,172 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523436785] [2020-08-18 20:24:52,173 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:24:52,173 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:52,173 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:24:52,174 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:24:52,174 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-18 20:24:52,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:52,275 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-18 20:24:52,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:24:52,276 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-18 20:24:52,276 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:52,278 INFO L225 Difference]: With dead ends: 65 [2020-08-18 20:24:52,278 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 20:24:52,279 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:24:52,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 20:24:52,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-18 20:24:52,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 20:24:52,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-18 20:24:52,289 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-18 20:24:52,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:52,289 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-18 20:24:52,290 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:24:52,290 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-18 20:24:52,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 20:24:52,291 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:52,291 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:52,291 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 20:24:52,291 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:52,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:52,291 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-18 20:24:52,292 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:52,292 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [505953671] [2020-08-18 20:24:52,292 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:52,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,339 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:52,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,352 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:52,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,367 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-18 20:24:52,368 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [505953671] [2020-08-18 20:24:52,368 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:52,368 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 20:24:52,368 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [24530713] [2020-08-18 20:24:52,369 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 20:24:52,369 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:52,369 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 20:24:52,369 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:24:52,370 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-18 20:24:52,474 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:52,475 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-18 20:24:52,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 20:24:52,475 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-18 20:24:52,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:52,477 INFO L225 Difference]: With dead ends: 73 [2020-08-18 20:24:52,477 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 20:24:52,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2020-08-18 20:24:52,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 20:24:52,485 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-18 20:24:52,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 20:24:52,486 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-18 20:24:52,486 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-18 20:24:52,487 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:52,487 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-18 20:24:52,487 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 20:24:52,487 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-18 20:24:52,488 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 20:24:52,488 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:52,488 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:52,488 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 20:24:52,488 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:52,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:52,489 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-18 20:24:52,489 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:52,489 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1836860973] [2020-08-18 20:24:52,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:52,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,540 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:52,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,554 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:52,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,572 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-18 20:24:52,573 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1836860973] [2020-08-18 20:24:52,573 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 20:24:52,573 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 20:24:52,574 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137416683] [2020-08-18 20:24:52,574 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 20:24:52,574 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:52,574 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 20:24:52,575 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 20:24:52,575 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-18 20:24:52,659 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:52,659 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-18 20:24:52,660 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 20:24:52,660 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-18 20:24:52,660 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:52,661 INFO L225 Difference]: With dead ends: 69 [2020-08-18 20:24:52,661 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 20:24:52,662 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2020-08-18 20:24:52,662 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 20:24:52,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 20:24:52,667 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 20:24:52,667 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-18 20:24:52,668 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-18 20:24:52,668 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:52,668 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-18 20:24:52,668 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 20:24:52,668 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-18 20:24:52,669 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 20:24:52,669 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:52,669 INFO L422 BasicCegarLoop]: trace histogram [9, 9, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:52,670 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 20:24:52,670 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:52,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:52,670 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-18 20:24:52,670 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:52,671 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [387820276] [2020-08-18 20:24:52,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:52,685 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,710 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:52,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:52,722 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:52,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:53,104 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:53,105 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [387820276] [2020-08-18 20:24:53,106 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:53,106 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 20:24:53,106 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476360126] [2020-08-18 20:24:53,107 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 20:24:53,108 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:53,108 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 20:24:53,108 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-18 20:24:53,108 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-18 20:24:53,344 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:53,344 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-18 20:24:53,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 20:24:53,345 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-18 20:24:53,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:53,346 INFO L225 Difference]: With dead ends: 74 [2020-08-18 20:24:53,346 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 20:24:53,348 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=104, Invalid=202, Unknown=0, NotChecked=0, Total=306 [2020-08-18 20:24:53,348 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 20:24:53,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 20:24:53,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 20:24:53,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-18 20:24:53,356 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-18 20:24:53,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:53,356 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-18 20:24:53,356 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 20:24:53,356 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-18 20:24:53,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 20:24:53,357 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:53,357 INFO L422 BasicCegarLoop]: trace histogram [10, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:53,358 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 20:24:53,358 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:53,358 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:53,358 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-18 20:24:53,358 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:53,359 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [10096073] [2020-08-18 20:24:53,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:53,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:53,424 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:53,425 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:53,442 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:53,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:53,893 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:53,893 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [10096073] [2020-08-18 20:24:53,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:53,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 20:24:53,894 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435883540] [2020-08-18 20:24:53,894 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 20:24:53,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:53,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 20:24:53,895 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-18 20:24:53,895 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-18 20:24:54,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:54,137 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-18 20:24:54,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 20:24:54,138 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-18 20:24:54,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:54,138 INFO L225 Difference]: With dead ends: 76 [2020-08-18 20:24:54,138 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 20:24:54,139 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 21 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=118, Invalid=224, Unknown=0, NotChecked=0, Total=342 [2020-08-18 20:24:54,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 20:24:54,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 20:24:54,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 20:24:54,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-18 20:24:54,144 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-18 20:24:54,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:54,145 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-18 20:24:54,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 20:24:54,145 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-18 20:24:54,146 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 20:24:54,146 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:54,146 INFO L422 BasicCegarLoop]: trace histogram [11, 11, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:54,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 20:24:54,146 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:54,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:54,147 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-18 20:24:54,147 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:54,147 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [786563781] [2020-08-18 20:24:54,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:54,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:54,184 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:54,185 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:54,195 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:54,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:54,665 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:54,665 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [786563781] [2020-08-18 20:24:54,665 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:54,666 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 20:24:54,666 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364486315] [2020-08-18 20:24:54,666 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 20:24:54,667 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:54,667 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 20:24:54,667 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-18 20:24:54,667 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-18 20:24:54,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:54,935 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-18 20:24:54,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 20:24:54,936 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 20:24:54,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:54,937 INFO L225 Difference]: With dead ends: 78 [2020-08-18 20:24:54,937 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 20:24:54,938 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-18 20:24:54,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 20:24:54,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 20:24:54,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 20:24:54,955 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-18 20:24:54,955 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-18 20:24:54,956 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:54,956 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-18 20:24:54,956 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 20:24:54,956 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-18 20:24:54,960 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 20:24:54,960 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:54,960 INFO L422 BasicCegarLoop]: trace histogram [12, 12, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:54,961 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 20:24:54,961 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:54,961 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:54,962 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-18 20:24:54,962 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:54,962 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1257453531] [2020-08-18 20:24:54,963 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:55,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:55,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:55,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:55,051 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:55,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:55,598 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:55,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1257453531] [2020-08-18 20:24:55,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:55,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 20:24:55,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926286043] [2020-08-18 20:24:55,601 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 20:24:55,601 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:55,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 20:24:55,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-18 20:24:55,602 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-18 20:24:55,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:55,834 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-18 20:24:55,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 20:24:55,834 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-18 20:24:55,835 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:55,835 INFO L225 Difference]: With dead ends: 80 [2020-08-18 20:24:55,836 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 20:24:55,837 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:24:55,837 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 20:24:55,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 20:24:55,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 20:24:55,843 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-18 20:24:55,843 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-18 20:24:55,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:55,843 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-18 20:24:55,843 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 20:24:55,843 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-18 20:24:55,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 20:24:55,844 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:55,844 INFO L422 BasicCegarLoop]: trace histogram [13, 13, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:55,845 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 20:24:55,845 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:55,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:55,845 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-18 20:24:55,845 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:55,846 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1082935437] [2020-08-18 20:24:55,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:55,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:55,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:55,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:55,898 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:55,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:56,597 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:56,598 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1082935437] [2020-08-18 20:24:56,598 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:56,598 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 20:24:56,598 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130924179] [2020-08-18 20:24:56,599 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 20:24:56,599 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:56,599 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 20:24:56,600 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-18 20:24:56,600 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-18 20:24:56,861 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:56,861 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-18 20:24:56,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 20:24:56,862 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-18 20:24:56,862 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:56,863 INFO L225 Difference]: With dead ends: 82 [2020-08-18 20:24:56,863 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 20:24:56,864 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-18 20:24:56,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 20:24:56,867 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 20:24:56,867 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 20:24:56,868 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-18 20:24:56,868 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-18 20:24:56,868 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:56,869 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-18 20:24:56,869 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 20:24:56,869 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-18 20:24:56,869 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 20:24:56,870 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:56,870 INFO L422 BasicCegarLoop]: trace histogram [14, 14, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:56,870 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 20:24:56,870 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:56,870 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:56,871 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-18 20:24:56,871 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:56,871 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1891897619] [2020-08-18 20:24:56,871 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:56,884 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:56,907 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:56,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:56,918 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:56,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:57,547 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:57,547 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1891897619] [2020-08-18 20:24:57,548 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:57,548 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 20:24:57,548 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852762212] [2020-08-18 20:24:57,548 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 20:24:57,549 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:57,549 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 20:24:57,549 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-18 20:24:57,550 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-18 20:24:57,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:57,847 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-18 20:24:57,847 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 20:24:57,848 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-18 20:24:57,848 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:57,848 INFO L225 Difference]: With dead ends: 84 [2020-08-18 20:24:57,848 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 20:24:57,849 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=184, Invalid=322, Unknown=0, NotChecked=0, Total=506 [2020-08-18 20:24:57,850 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 20:24:57,854 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 20:24:57,854 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 20:24:57,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-18 20:24:57,857 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-18 20:24:57,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:57,860 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-18 20:24:57,860 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 20:24:57,860 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-18 20:24:57,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 20:24:57,861 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:57,861 INFO L422 BasicCegarLoop]: trace histogram [15, 15, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:57,862 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 20:24:57,862 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:57,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:57,862 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-18 20:24:57,863 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:57,863 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1914215086] [2020-08-18 20:24:57,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:57,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:57,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:57,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:57,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:57,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:58,607 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:58,607 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1914215086] [2020-08-18 20:24:58,607 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:58,607 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 20:24:58,608 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010194743] [2020-08-18 20:24:58,608 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 20:24:58,608 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:58,609 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 20:24:58,609 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-18 20:24:58,609 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-18 20:24:58,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:58,824 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-18 20:24:58,824 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 20:24:58,824 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-18 20:24:58,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:58,825 INFO L225 Difference]: With dead ends: 86 [2020-08-18 20:24:58,825 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 20:24:58,828 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-18 20:24:58,828 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 20:24:58,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 20:24:58,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 20:24:58,832 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-18 20:24:58,832 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-18 20:24:58,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:58,833 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-18 20:24:58,833 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 20:24:58,833 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-18 20:24:58,834 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 20:24:58,834 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:58,834 INFO L422 BasicCegarLoop]: trace histogram [16, 16, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:58,834 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 20:24:58,834 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:58,835 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:58,835 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-18 20:24:58,835 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:58,835 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1577398862] [2020-08-18 20:24:58,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:24:58,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:58,882 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:24:58,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:58,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:24:58,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:24:59,677 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:24:59,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1577398862] [2020-08-18 20:24:59,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:24:59,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 20:24:59,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948417772] [2020-08-18 20:24:59,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 20:24:59,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:24:59,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 20:24:59,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-18 20:24:59,679 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-18 20:24:59,987 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:24:59,988 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-18 20:24:59,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 20:24:59,988 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-18 20:24:59,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:24:59,990 INFO L225 Difference]: With dead ends: 88 [2020-08-18 20:24:59,990 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 20:24:59,991 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-18 20:24:59,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 20:24:59,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 20:24:59,996 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 20:24:59,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-18 20:24:59,996 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-18 20:24:59,997 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:24:59,997 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-18 20:24:59,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 20:24:59,997 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-18 20:24:59,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 20:24:59,998 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:24:59,998 INFO L422 BasicCegarLoop]: trace histogram [17, 17, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:24:59,998 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 20:24:59,998 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:24:59,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:24:59,999 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-18 20:24:59,999 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:24:59,999 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [222247175] [2020-08-18 20:24:59,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:00,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:00,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:00,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:00,099 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:00,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:01,218 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:01,219 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [222247175] [2020-08-18 20:25:01,219 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:01,220 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 20:25:01,220 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506852282] [2020-08-18 20:25:01,220 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 20:25:01,220 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:01,221 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 20:25:01,221 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-18 20:25:01,221 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-18 20:25:01,520 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:01,521 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-18 20:25:01,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 20:25:01,523 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-18 20:25:01,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:01,524 INFO L225 Difference]: With dead ends: 90 [2020-08-18 20:25:01,524 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 20:25:01,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-18 20:25:01,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 20:25:01,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 20:25:01,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 20:25:01,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-18 20:25:01,529 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-18 20:25:01,529 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:01,530 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-18 20:25:01,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 20:25:01,530 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-18 20:25:01,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 20:25:01,530 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:01,531 INFO L422 BasicCegarLoop]: trace histogram [18, 18, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:01,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 20:25:01,531 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:01,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:01,532 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-18 20:25:01,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:01,533 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1571870981] [2020-08-18 20:25:01,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:01,567 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:01,602 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:01,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:01,615 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:01,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:02,484 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:02,484 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1571870981] [2020-08-18 20:25:02,484 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:02,484 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 20:25:02,485 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [796353229] [2020-08-18 20:25:02,485 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 20:25:02,485 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:02,486 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 20:25:02,486 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-18 20:25:02,486 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-18 20:25:02,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:02,788 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-18 20:25:02,788 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 20:25:02,788 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-18 20:25:02,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:02,789 INFO L225 Difference]: With dead ends: 92 [2020-08-18 20:25:02,789 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 20:25:02,790 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-18 20:25:02,790 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 20:25:02,793 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 20:25:02,793 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 20:25:02,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-18 20:25:02,794 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-18 20:25:02,794 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:02,795 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-18 20:25:02,795 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 20:25:02,795 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-18 20:25:02,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 20:25:02,795 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:02,796 INFO L422 BasicCegarLoop]: trace histogram [19, 19, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:02,796 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 20:25:02,796 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:02,796 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:02,796 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-18 20:25:02,797 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:02,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2104609291] [2020-08-18 20:25:02,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:02,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:02,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:02,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:02,858 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:02,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:03,795 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:03,796 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2104609291] [2020-08-18 20:25:03,796 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:03,796 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 20:25:03,797 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485023641] [2020-08-18 20:25:03,798 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 20:25:03,798 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:03,798 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 20:25:03,799 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-18 20:25:03,799 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-18 20:25:04,151 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:04,152 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-18 20:25:04,152 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 20:25:04,152 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-18 20:25:04,152 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:04,153 INFO L225 Difference]: With dead ends: 94 [2020-08-18 20:25:04,153 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 20:25:04,154 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-18 20:25:04,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 20:25:04,158 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 20:25:04,158 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 20:25:04,159 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-18 20:25:04,159 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-18 20:25:04,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:04,159 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-18 20:25:04,160 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 20:25:04,160 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-18 20:25:04,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 20:25:04,160 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:04,160 INFO L422 BasicCegarLoop]: trace histogram [20, 20, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:04,161 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 20:25:04,161 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:04,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:04,161 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-18 20:25:04,161 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:04,162 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [473400979] [2020-08-18 20:25:04,162 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:04,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:04,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:04,210 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:04,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:04,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:05,244 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:05,245 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [473400979] [2020-08-18 20:25:05,245 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:05,245 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 20:25:05,245 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045281757] [2020-08-18 20:25:05,245 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 20:25:05,246 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:05,246 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 20:25:05,246 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-18 20:25:05,246 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-18 20:25:05,616 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:05,616 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-18 20:25:05,616 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 20:25:05,617 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-18 20:25:05,617 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:05,618 INFO L225 Difference]: With dead ends: 96 [2020-08-18 20:25:05,618 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 20:25:05,619 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-18 20:25:05,619 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 20:25:05,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 20:25:05,623 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 20:25:05,623 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-18 20:25:05,624 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-18 20:25:05,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:05,624 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-18 20:25:05,624 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 20:25:05,624 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-18 20:25:05,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 20:25:05,625 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:05,625 INFO L422 BasicCegarLoop]: trace histogram [21, 21, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:05,625 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 20:25:05,625 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:05,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:05,626 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-18 20:25:05,626 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:05,626 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1719972850] [2020-08-18 20:25:05,626 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:05,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:05,674 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:05,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:05,685 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:05,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:06,772 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:06,773 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1719972850] [2020-08-18 20:25:06,773 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:06,773 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 20:25:06,773 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2079325474] [2020-08-18 20:25:06,773 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 20:25:06,774 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:06,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 20:25:06,774 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-18 20:25:06,775 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-18 20:25:07,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:07,023 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-18 20:25:07,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 20:25:07,023 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-18 20:25:07,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:07,024 INFO L225 Difference]: With dead ends: 98 [2020-08-18 20:25:07,024 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 20:25:07,025 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-18 20:25:07,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 20:25:07,029 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 20:25:07,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 20:25:07,029 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-18 20:25:07,029 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-18 20:25:07,029 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:07,030 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-18 20:25:07,030 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 20:25:07,030 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-18 20:25:07,030 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 20:25:07,030 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:07,031 INFO L422 BasicCegarLoop]: trace histogram [22, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:07,031 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 20:25:07,031 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:07,031 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:07,031 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-18 20:25:07,031 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:07,032 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1730275684] [2020-08-18 20:25:07,032 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:07,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:07,082 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:07,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:07,093 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:07,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:08,206 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:08,207 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1730275684] [2020-08-18 20:25:08,207 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:08,207 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 20:25:08,207 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1785277362] [2020-08-18 20:25:08,207 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 20:25:08,208 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:08,208 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 20:25:08,208 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-18 20:25:08,208 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-18 20:25:08,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:08,556 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-18 20:25:08,557 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 20:25:08,557 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-18 20:25:08,557 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:08,558 INFO L225 Difference]: With dead ends: 100 [2020-08-18 20:25:08,558 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 20:25:08,559 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-18 20:25:08,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 20:25:08,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 20:25:08,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 20:25:08,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-18 20:25:08,564 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-18 20:25:08,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:08,564 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-18 20:25:08,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 20:25:08,564 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-18 20:25:08,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 20:25:08,565 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:08,565 INFO L422 BasicCegarLoop]: trace histogram [23, 23, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:08,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 20:25:08,565 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:08,565 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:08,566 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-18 20:25:08,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:08,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1489193331] [2020-08-18 20:25:08,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:08,583 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:08,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:08,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:08,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:08,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:09,839 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:09,839 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1489193331] [2020-08-18 20:25:09,839 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:09,839 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 20:25:09,839 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1579255475] [2020-08-18 20:25:09,840 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 20:25:09,840 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:09,840 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 20:25:09,841 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-18 20:25:09,841 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-18 20:25:10,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:10,261 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-18 20:25:10,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 20:25:10,261 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-18 20:25:10,262 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:10,262 INFO L225 Difference]: With dead ends: 102 [2020-08-18 20:25:10,263 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 20:25:10,264 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-18 20:25:10,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 20:25:10,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 20:25:10,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 20:25:10,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-18 20:25:10,269 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-18 20:25:10,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:10,269 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-18 20:25:10,269 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 20:25:10,270 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-18 20:25:10,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 20:25:10,270 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:10,270 INFO L422 BasicCegarLoop]: trace histogram [24, 24, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:10,271 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 20:25:10,271 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:10,271 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:10,271 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-18 20:25:10,271 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:10,271 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [194542044] [2020-08-18 20:25:10,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:10,291 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:10,323 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:10,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:10,334 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:10,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:11,611 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:11,612 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [194542044] [2020-08-18 20:25:11,612 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:11,612 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 20:25:11,612 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1950042252] [2020-08-18 20:25:11,613 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 20:25:11,613 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:11,613 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 20:25:11,614 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-18 20:25:11,614 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-18 20:25:11,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:11,939 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-18 20:25:11,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 20:25:11,940 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-18 20:25:11,941 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:11,942 INFO L225 Difference]: With dead ends: 104 [2020-08-18 20:25:11,942 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 20:25:11,943 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 20:25:11,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 20:25:11,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 20:25:11,947 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 20:25:11,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-18 20:25:11,948 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-18 20:25:11,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:11,948 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-18 20:25:11,948 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 20:25:11,948 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-18 20:25:11,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 20:25:11,949 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:11,949 INFO L422 BasicCegarLoop]: trace histogram [25, 25, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:11,949 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 20:25:11,949 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:11,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:11,949 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-18 20:25:11,949 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:11,950 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1783941180] [2020-08-18 20:25:11,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:11,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:12,022 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:12,023 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:12,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:12,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:13,335 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:13,335 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1783941180] [2020-08-18 20:25:13,336 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:13,336 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 20:25:13,336 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1855018019] [2020-08-18 20:25:13,337 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 20:25:13,337 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:13,337 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 20:25:13,337 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-18 20:25:13,338 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-18 20:25:13,765 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:13,765 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-18 20:25:13,765 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 20:25:13,765 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-18 20:25:13,766 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:13,766 INFO L225 Difference]: With dead ends: 106 [2020-08-18 20:25:13,767 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 20:25:13,768 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 20:25:13,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 20:25:13,771 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 20:25:13,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 20:25:13,772 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-18 20:25:13,772 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-18 20:25:13,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:13,773 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-18 20:25:13,773 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 20:25:13,773 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-18 20:25:13,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 20:25:13,773 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:13,774 INFO L422 BasicCegarLoop]: trace histogram [26, 26, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:13,774 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 20:25:13,774 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:13,774 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:13,774 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-18 20:25:13,774 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:13,775 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1179452154] [2020-08-18 20:25:13,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:13,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:13,830 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:13,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:13,840 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:13,857 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:15,236 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:15,236 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1179452154] [2020-08-18 20:25:15,236 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:15,237 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 20:25:15,237 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [416343829] [2020-08-18 20:25:15,237 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 20:25:15,237 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:15,237 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 20:25:15,238 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-18 20:25:15,238 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-18 20:25:15,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:15,674 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-18 20:25:15,674 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 20:25:15,675 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-18 20:25:15,675 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:15,676 INFO L225 Difference]: With dead ends: 108 [2020-08-18 20:25:15,676 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 20:25:15,677 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 20:25:15,678 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 20:25:15,680 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 20:25:15,681 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 20:25:15,681 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-18 20:25:15,682 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-18 20:25:15,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:15,682 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-18 20:25:15,682 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 20:25:15,682 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-18 20:25:15,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 20:25:15,684 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:15,684 INFO L422 BasicCegarLoop]: trace histogram [27, 27, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:15,685 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 20:25:15,685 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:15,685 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:15,686 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-18 20:25:15,686 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:15,686 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [627478943] [2020-08-18 20:25:15,686 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:15,714 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:15,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:15,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:15,760 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:15,777 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:17,384 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:17,384 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [627478943] [2020-08-18 20:25:17,385 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:17,385 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 20:25:17,385 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [121828914] [2020-08-18 20:25:17,386 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 20:25:17,386 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:17,386 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 20:25:17,387 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 20:25:17,387 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-18 20:25:17,808 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:17,808 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-18 20:25:17,809 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 20:25:17,809 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-18 20:25:17,809 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:17,810 INFO L225 Difference]: With dead ends: 110 [2020-08-18 20:25:17,810 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 20:25:17,811 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 20:25:17,812 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 20:25:17,815 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 20:25:17,815 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 20:25:17,816 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-18 20:25:17,816 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-18 20:25:17,816 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:17,816 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-18 20:25:17,816 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 20:25:17,816 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-18 20:25:17,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 20:25:17,817 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:17,817 INFO L422 BasicCegarLoop]: trace histogram [28, 28, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:17,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 20:25:17,818 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:17,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:17,818 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-18 20:25:17,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:17,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1156901059] [2020-08-18 20:25:17,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:17,840 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:17,868 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:17,869 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:17,892 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:17,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:19,473 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:19,473 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1156901059] [2020-08-18 20:25:19,473 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:19,473 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 20:25:19,473 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99411393] [2020-08-18 20:25:19,474 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 20:25:19,474 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:19,474 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 20:25:19,475 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 20:25:19,475 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-18 20:25:19,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:19,948 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-18 20:25:19,948 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 20:25:19,949 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-18 20:25:19,949 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:19,950 INFO L225 Difference]: With dead ends: 112 [2020-08-18 20:25:19,950 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 20:25:19,951 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 20:25:19,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 20:25:19,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 20:25:19,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 20:25:19,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-18 20:25:19,956 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-18 20:25:19,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:19,957 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-18 20:25:19,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 20:25:19,957 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-18 20:25:19,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 20:25:19,958 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:19,958 INFO L422 BasicCegarLoop]: trace histogram [29, 29, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:19,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 20:25:19,958 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:19,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:19,959 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-18 20:25:19,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:19,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [184648900] [2020-08-18 20:25:19,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:19,980 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:20,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:20,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:20,029 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:20,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:21,709 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:21,710 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [184648900] [2020-08-18 20:25:21,710 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:21,710 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 20:25:21,710 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101941731] [2020-08-18 20:25:21,711 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 20:25:21,711 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:21,711 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 20:25:21,711 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 20:25:21,711 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-18 20:25:22,326 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:22,326 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-18 20:25:22,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 20:25:22,327 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-18 20:25:22,327 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:22,328 INFO L225 Difference]: With dead ends: 114 [2020-08-18 20:25:22,328 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 20:25:22,329 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 20:25:22,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 20:25:22,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 20:25:22,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 20:25:22,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-18 20:25:22,335 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-18 20:25:22,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:22,335 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-18 20:25:22,336 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 20:25:22,336 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-18 20:25:22,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 20:25:22,336 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:22,336 INFO L422 BasicCegarLoop]: trace histogram [30, 30, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:22,337 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 20:25:22,337 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:22,337 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:22,337 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-18 20:25:22,337 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:22,337 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1909264637] [2020-08-18 20:25:22,338 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:22,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:22,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:22,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:22,398 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:22,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:24,160 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:24,161 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1909264637] [2020-08-18 20:25:24,161 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:24,161 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 20:25:24,161 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1146825541] [2020-08-18 20:25:24,161 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 20:25:24,162 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:24,162 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 20:25:24,162 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 20:25:24,162 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-18 20:25:24,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:24,521 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-18 20:25:24,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 20:25:24,522 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-18 20:25:24,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:24,523 INFO L225 Difference]: With dead ends: 116 [2020-08-18 20:25:24,523 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 20:25:24,525 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 20:25:24,525 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 20:25:24,528 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 20:25:24,529 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 20:25:24,529 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-18 20:25:24,529 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-18 20:25:24,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:24,530 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-18 20:25:24,530 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 20:25:24,530 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-18 20:25:24,530 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 20:25:24,531 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:24,531 INFO L422 BasicCegarLoop]: trace histogram [31, 31, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:24,531 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 20:25:24,531 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:24,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:24,532 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-18 20:25:24,532 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:24,532 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [63676241] [2020-08-18 20:25:24,532 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:24,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:24,590 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:24,591 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:24,601 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:24,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:26,422 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:26,422 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [63676241] [2020-08-18 20:25:26,422 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:26,423 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 20:25:26,423 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [165530601] [2020-08-18 20:25:26,423 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 20:25:26,423 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:26,423 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 20:25:26,424 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 20:25:26,424 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-18 20:25:26,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:26,951 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-18 20:25:26,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 20:25:26,951 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-18 20:25:26,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:26,953 INFO L225 Difference]: With dead ends: 118 [2020-08-18 20:25:26,953 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 20:25:26,955 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 20:25:26,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 20:25:26,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 20:25:26,960 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 20:25:26,961 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-18 20:25:26,961 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-18 20:25:26,961 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:26,961 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-18 20:25:26,962 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 20:25:26,962 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-18 20:25:26,962 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 20:25:26,962 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:26,962 INFO L422 BasicCegarLoop]: trace histogram [32, 32, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:26,963 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 20:25:26,963 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:26,963 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:26,963 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-18 20:25:26,963 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:26,964 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [250383226] [2020-08-18 20:25:26,964 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:26,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:27,050 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:27,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:27,066 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:27,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:28,979 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:28,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [250383226] [2020-08-18 20:25:28,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:28,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 20:25:28,979 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1160781876] [2020-08-18 20:25:28,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 20:25:28,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:28,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 20:25:28,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 20:25:28,982 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-18 20:25:29,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:29,428 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-18 20:25:29,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 20:25:29,429 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-18 20:25:29,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:29,430 INFO L225 Difference]: With dead ends: 120 [2020-08-18 20:25:29,430 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 20:25:29,432 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 20:25:29,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 20:25:29,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 20:25:29,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 20:25:29,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-18 20:25:29,437 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-18 20:25:29,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:29,438 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-18 20:25:29,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 20:25:29,438 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-18 20:25:29,439 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 20:25:29,439 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:29,439 INFO L422 BasicCegarLoop]: trace histogram [33, 33, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:29,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 20:25:29,439 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:29,440 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:29,440 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-18 20:25:29,440 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:29,440 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [517803390] [2020-08-18 20:25:29,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:29,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:29,498 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:29,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:29,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:29,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:31,497 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:31,497 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [517803390] [2020-08-18 20:25:31,497 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:31,497 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 20:25:31,498 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1551183825] [2020-08-18 20:25:31,498 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 20:25:31,498 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:31,499 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 20:25:31,499 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 20:25:31,499 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-18 20:25:31,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:31,857 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-18 20:25:31,858 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 20:25:31,858 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-18 20:25:31,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:31,859 INFO L225 Difference]: With dead ends: 122 [2020-08-18 20:25:31,859 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 20:25:31,860 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 20:25:31,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 20:25:31,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 20:25:31,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 20:25:31,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-18 20:25:31,866 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-18 20:25:31,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:31,866 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-18 20:25:31,866 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 20:25:31,866 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-18 20:25:31,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 20:25:31,867 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:31,867 INFO L422 BasicCegarLoop]: trace histogram [34, 34, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:31,867 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 20:25:31,867 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:31,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:31,868 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-18 20:25:31,868 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:31,869 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [200120517] [2020-08-18 20:25:31,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:31,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:31,930 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:31,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:31,941 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:31,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:34,150 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:34,150 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [200120517] [2020-08-18 20:25:34,150 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:34,150 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 20:25:34,150 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955421671] [2020-08-18 20:25:34,151 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 20:25:34,151 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:34,151 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 20:25:34,151 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 20:25:34,151 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-18 20:25:34,443 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:34,443 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-18 20:25:34,444 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 20:25:34,444 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-18 20:25:34,444 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:34,445 INFO L225 Difference]: With dead ends: 124 [2020-08-18 20:25:34,446 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 20:25:34,447 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 20:25:34,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 20:25:34,451 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 20:25:34,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 20:25:34,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-18 20:25:34,452 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-18 20:25:34,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:34,453 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-18 20:25:34,453 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 20:25:34,453 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-18 20:25:34,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 20:25:34,454 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:34,454 INFO L422 BasicCegarLoop]: trace histogram [35, 35, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:34,454 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 20:25:34,454 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:34,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:34,454 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-18 20:25:34,455 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:34,455 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [707893212] [2020-08-18 20:25:34,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:34,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:34,514 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:34,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:34,548 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:34,570 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:36,765 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:36,765 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [707893212] [2020-08-18 20:25:36,765 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:36,766 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 20:25:36,766 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [913996714] [2020-08-18 20:25:36,766 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 20:25:36,766 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:36,766 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 20:25:36,767 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 20:25:36,767 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-18 20:25:37,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:37,129 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-18 20:25:37,130 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 20:25:37,130 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-18 20:25:37,131 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:37,131 INFO L225 Difference]: With dead ends: 126 [2020-08-18 20:25:37,132 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 20:25:37,137 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 20:25:37,137 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 20:25:37,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 20:25:37,141 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 20:25:37,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-18 20:25:37,141 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-18 20:25:37,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:37,141 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-18 20:25:37,142 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 20:25:37,142 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-18 20:25:37,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 20:25:37,142 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:37,142 INFO L422 BasicCegarLoop]: trace histogram [36, 36, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:37,143 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 20:25:37,143 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:37,143 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:37,143 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-18 20:25:37,143 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:37,143 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [523321056] [2020-08-18 20:25:37,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:37,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:37,207 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:37,207 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:37,217 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:37,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:39,556 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:39,556 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [523321056] [2020-08-18 20:25:39,556 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:39,557 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 20:25:39,557 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1811261625] [2020-08-18 20:25:39,557 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 20:25:39,557 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:39,558 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 20:25:39,558 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 20:25:39,558 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-18 20:25:40,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:40,011 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-18 20:25:40,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 20:25:40,011 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-18 20:25:40,012 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:40,012 INFO L225 Difference]: With dead ends: 128 [2020-08-18 20:25:40,012 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 20:25:40,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 20:25:40,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 20:25:40,019 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 20:25:40,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 20:25:40,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-18 20:25:40,020 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-18 20:25:40,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:40,020 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-18 20:25:40,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 20:25:40,020 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-18 20:25:40,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 20:25:40,021 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:40,022 INFO L422 BasicCegarLoop]: trace histogram [37, 37, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:40,022 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 20:25:40,023 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:40,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:40,023 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-18 20:25:40,023 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:40,023 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [498873813] [2020-08-18 20:25:40,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:40,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:40,123 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:40,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:40,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:40,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:42,543 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 20:25:42,543 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [498873813] [2020-08-18 20:25:42,543 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 20:25:42,543 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 20:25:42,544 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786552279] [2020-08-18 20:25:42,544 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 20:25:42,544 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 20:25:42,544 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 20:25:42,545 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 20:25:42,545 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-18 20:25:43,140 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 20:25:43,141 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-18 20:25:43,141 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 20:25:43,141 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-18 20:25:43,142 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 20:25:43,142 INFO L225 Difference]: With dead ends: 130 [2020-08-18 20:25:43,142 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 20:25:43,143 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 20:25:43,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 20:25:43,147 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 20:25:43,147 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 20:25:43,148 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-18 20:25:43,148 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-18 20:25:43,148 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 20:25:43,148 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-18 20:25:43,149 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 20:25:43,149 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-18 20:25:43,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 20:25:43,149 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 20:25:43,150 INFO L422 BasicCegarLoop]: trace histogram [38, 38, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-18 20:25:43,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 20:25:43,150 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 20:25:43,150 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 20:25:43,150 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-18 20:25:43,150 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 20:25:43,151 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [493153816] [2020-08-18 20:25:43,151 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 20:25:43,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,213 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 20:25:43,214 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 20:25:43,225 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 20:25:43,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat