/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.smt.solver Internal_SMTInterpol --traceabstraction.compute.trace.for.counterexample.result false --traceabstraction.use.minimal.unsat.core.enumeration true --traceabstraction.additional.smt.options enumeration-timeout=5 --traceabstraction.additional.smt.options interpolation-heuristic=DEEPEST -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-5644d1e-m [2020-08-18 21:13:09,690 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-18 21:13:09,693 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-18 21:13:09,738 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-18 21:13:09,738 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-18 21:13:09,749 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-18 21:13:09,751 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-18 21:13:09,753 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-18 21:13:09,755 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-18 21:13:09,757 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-18 21:13:09,758 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-18 21:13:09,759 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-18 21:13:09,760 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-18 21:13:09,763 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-18 21:13:09,763 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-18 21:13:09,765 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-18 21:13:09,766 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-18 21:13:09,770 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-18 21:13:09,771 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-18 21:13:09,773 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-18 21:13:09,776 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-18 21:13:09,776 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-18 21:13:09,777 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-18 21:13:09,778 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-18 21:13:09,780 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-18 21:13:09,787 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-18 21:13:09,787 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-18 21:13:09,788 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-18 21:13:09,789 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-18 21:13:09,809 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-18 21:13:09,810 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-18 21:13:09,811 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-18 21:13:09,811 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-18 21:13:09,811 INFO L138 SettingsManager]: * Use SBE=true [2020-08-18 21:13:09,812 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-18 21:13:09,812 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-18 21:13:09,812 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-18 21:13:09,812 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-18 21:13:09,813 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-18 21:13:09,813 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-18 21:13:09,813 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-18 21:13:09,813 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-18 21:13:09,813 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-18 21:13:09,813 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-18 21:13:09,814 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-18 21:13:09,814 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-18 21:13:09,814 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-18 21:13:09,814 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-18 21:13:09,815 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-18 21:13:09,815 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-18 21:13:09,815 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:13:09,815 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-18 21:13:09,815 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-18 21:13:09,816 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-18 21:13:09,816 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-18 21:13:09,816 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-18 21:13:09,816 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-18 21:13:09,816 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-18 21:13:09,817 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: SMT solver -> Internal_SMTInterpol Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute trace for counterexample result -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use minimal unsat core enumeration -> true Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=DEEPEST; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=DEEPEST; [2020-08-18 21:13:10,130 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-18 21:13:10,148 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-18 21:13:10,151 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-18 21:13:10,152 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-18 21:13:10,153 INFO L275 PluginConnector]: CDTParser initialized [2020-08-18 21:13:10,153 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 21:13:10,213 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5c1d33df9/14750f40a09e42d6b7036c511f392145/FLAGc6d780cec [2020-08-18 21:13:10,631 INFO L306 CDTParser]: Found 1 translation units. [2020-08-18 21:13:10,632 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-18 21:13:10,636 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5c1d33df9/14750f40a09e42d6b7036c511f392145/FLAGc6d780cec [2020-08-18 21:13:11,048 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/5c1d33df9/14750f40a09e42d6b7036c511f392145 [2020-08-18 21:13:11,060 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-18 21:13:11,062 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-18 21:13:11,064 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-18 21:13:11,064 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-18 21:13:11,068 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-18 21:13:11,069 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:13:11" (1/1) ... [2020-08-18 21:13:11,072 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7468b030 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:11, skipping insertion in model container [2020-08-18 21:13:11,072 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 18.08 09:13:11" (1/1) ... [2020-08-18 21:13:11,081 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-18 21:13:11,100 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-18 21:13:11,275 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:13:11,281 INFO L203 MainTranslator]: Completed pre-run [2020-08-18 21:13:11,300 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-18 21:13:11,316 INFO L208 MainTranslator]: Completed translation [2020-08-18 21:13:11,317 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:11 WrapperNode [2020-08-18 21:13:11,317 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-18 21:13:11,317 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-18 21:13:11,318 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-18 21:13:11,318 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-18 21:13:11,415 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:11" (1/1) ... [2020-08-18 21:13:11,415 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:11" (1/1) ... [2020-08-18 21:13:11,423 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:11" (1/1) ... [2020-08-18 21:13:11,423 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:11" (1/1) ... [2020-08-18 21:13:11,430 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:11" (1/1) ... [2020-08-18 21:13:11,435 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:11" (1/1) ... [2020-08-18 21:13:11,437 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:11" (1/1) ... [2020-08-18 21:13:11,439 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-18 21:13:11,439 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-18 21:13:11,440 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-18 21:13:11,440 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-18 21:13:11,441 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:11" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-18 21:13:11,495 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-18 21:13:11,495 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-18 21:13:11,496 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-18 21:13:11,496 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-18 21:13:11,496 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-18 21:13:11,496 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-18 21:13:11,496 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-18 21:13:11,497 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-18 21:13:11,497 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-18 21:13:11,497 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-18 21:13:11,497 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-18 21:13:11,497 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-18 21:13:11,497 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-18 21:13:11,498 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-18 21:13:11,498 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-18 21:13:11,498 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-18 21:13:11,498 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-18 21:13:11,498 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-18 21:13:11,750 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-18 21:13:11,750 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-18 21:13:11,755 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:13:11 BoogieIcfgContainer [2020-08-18 21:13:11,756 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-18 21:13:11,757 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-18 21:13:11,758 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-18 21:13:11,761 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-18 21:13:11,761 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 18.08 09:13:11" (1/3) ... [2020-08-18 21:13:11,762 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21e0939c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:13:11, skipping insertion in model container [2020-08-18 21:13:11,762 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 18.08 09:13:11" (2/3) ... [2020-08-18 21:13:11,762 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@21e0939c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 18.08 09:13:11, skipping insertion in model container [2020-08-18 21:13:11,762 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 18.08 09:13:11" (3/3) ... [2020-08-18 21:13:11,764 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-18 21:13:11,776 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-18 21:13:11,784 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-18 21:13:11,803 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-18 21:13:11,833 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-18 21:13:11,834 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-18 21:13:11,834 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-18 21:13:11,834 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-18 21:13:11,834 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-18 21:13:11,834 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-18 21:13:11,834 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-18 21:13:11,835 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-18 21:13:11,857 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-18 21:13:11,864 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 21:13:11,864 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:11,865 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 21:13:11,865 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:11,871 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:11,871 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-18 21:13:11,880 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:11,881 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [609416044] [2020-08-18 21:13:11,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:11,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,062 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:12,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,092 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:12,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,105 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:13:12,106 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [609416044] [2020-08-18 21:13:12,108 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:13:12,108 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-18 21:13:12,109 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [861533790] [2020-08-18 21:13:12,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-18 21:13:12,114 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:12,128 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-18 21:13:12,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-18 21:13:12,131 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-18 21:13:12,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:12,315 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-18 21:13:12,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-18 21:13:12,317 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-18 21:13:12,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:12,340 INFO L225 Difference]: With dead ends: 59 [2020-08-18 21:13:12,340 INFO L226 Difference]: Without dead ends: 31 [2020-08-18 21:13:12,346 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 21:13:12,367 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-18 21:13:12,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-18 21:13:12,399 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-18 21:13:12,404 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-18 21:13:12,406 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-18 21:13:12,406 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:12,407 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-18 21:13:12,407 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-18 21:13:12,407 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-18 21:13:12,408 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-18 21:13:12,409 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:12,409 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 21:13:12,410 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-18 21:13:12,410 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:12,411 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:12,411 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-18 21:13:12,411 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:12,412 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [531543472] [2020-08-18 21:13:12,412 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:12,452 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,487 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:12,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:12,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,591 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:13:12,592 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [531543472] [2020-08-18 21:13:12,592 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:13:12,592 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-18 21:13:12,593 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1724574263] [2020-08-18 21:13:12,594 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:13:12,595 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:12,595 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:13:12,595 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:13:12,596 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-18 21:13:12,778 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:12,779 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-18 21:13:12,779 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-18 21:13:12,789 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-18 21:13:12,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:12,790 INFO L225 Difference]: With dead ends: 48 [2020-08-18 21:13:12,790 INFO L226 Difference]: Without dead ends: 30 [2020-08-18 21:13:12,793 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 21:13:12,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-18 21:13:12,799 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-18 21:13:12,799 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-18 21:13:12,800 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-18 21:13:12,801 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-18 21:13:12,801 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:12,801 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-18 21:13:12,801 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:13:12,801 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-18 21:13:12,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-18 21:13:12,802 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:12,803 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 21:13:12,803 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-18 21:13:12,803 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:12,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:12,803 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-18 21:13:12,804 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:12,804 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1949293026] [2020-08-18 21:13:12,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:12,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,852 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:12,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,872 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:12,879 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:12,964 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:13:12,964 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1949293026] [2020-08-18 21:13:12,965 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:12,965 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-18 21:13:12,965 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2056784710] [2020-08-18 21:13:12,966 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-18 21:13:12,966 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:12,966 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-18 21:13:12,966 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-18 21:13:12,967 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-18 21:13:13,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:13,163 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-18 21:13:13,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-18 21:13:13,164 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-18 21:13:13,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:13,165 INFO L225 Difference]: With dead ends: 50 [2020-08-18 21:13:13,165 INFO L226 Difference]: Without dead ends: 32 [2020-08-18 21:13:13,167 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 21:13:13,168 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-18 21:13:13,176 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-18 21:13:13,176 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-18 21:13:13,178 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-18 21:13:13,178 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-18 21:13:13,179 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:13,179 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-18 21:13:13,179 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-18 21:13:13,179 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-18 21:13:13,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-18 21:13:13,181 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:13,181 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 21:13:13,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-18 21:13:13,181 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:13,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:13,182 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-18 21:13:13,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:13,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [334631514] [2020-08-18 21:13:13,183 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:13,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:13,273 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:13,275 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:13,290 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:13,300 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:13,416 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:13:13,417 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [334631514] [2020-08-18 21:13:13,417 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:13,417 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-18 21:13:13,417 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [765125469] [2020-08-18 21:13:13,418 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-18 21:13:13,418 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:13,418 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-18 21:13:13,419 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-18 21:13:13,419 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-18 21:13:13,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:13,562 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-18 21:13:13,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-18 21:13:13,562 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-18 21:13:13,563 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:13,563 INFO L225 Difference]: With dead ends: 52 [2020-08-18 21:13:13,564 INFO L226 Difference]: Without dead ends: 34 [2020-08-18 21:13:13,564 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:13:13,565 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-18 21:13:13,570 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-18 21:13:13,570 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-18 21:13:13,571 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-18 21:13:13,571 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-18 21:13:13,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:13,572 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-18 21:13:13,572 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-18 21:13:13,572 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-18 21:13:13,573 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-18 21:13:13,573 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:13,573 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 21:13:13,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-18 21:13:13,574 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:13,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:13,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-18 21:13:13,575 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:13,575 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [397980787] [2020-08-18 21:13:13,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:13,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:13,616 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:13,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:13,631 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:13,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:13,845 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:13:13,846 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [397980787] [2020-08-18 21:13:13,846 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:13,846 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-18 21:13:13,847 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440657996] [2020-08-18 21:13:13,847 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-18 21:13:13,848 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:13,848 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-18 21:13:13,849 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-18 21:13:13,849 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-18 21:13:14,032 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:14,033 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-18 21:13:14,033 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-18 21:13:14,033 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-18 21:13:14,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:14,034 INFO L225 Difference]: With dead ends: 54 [2020-08-18 21:13:14,034 INFO L226 Difference]: Without dead ends: 36 [2020-08-18 21:13:14,035 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 21:13:14,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-18 21:13:14,042 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-18 21:13:14,042 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-18 21:13:14,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-18 21:13:14,045 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-18 21:13:14,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:14,046 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-18 21:13:14,046 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-18 21:13:14,046 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-18 21:13:14,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-18 21:13:14,047 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:14,047 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 21:13:14,047 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-18 21:13:14,047 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:14,049 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:14,049 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-18 21:13:14,049 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:14,052 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2110300308] [2020-08-18 21:13:14,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:14,076 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:14,120 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:14,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:14,137 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:14,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:14,368 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:13:14,369 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2110300308] [2020-08-18 21:13:14,369 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:14,369 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-18 21:13:14,370 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [585262903] [2020-08-18 21:13:14,370 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-18 21:13:14,370 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:14,371 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-18 21:13:14,371 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-18 21:13:14,371 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-18 21:13:14,532 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:14,532 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-18 21:13:14,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-18 21:13:14,533 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-18 21:13:14,533 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:14,533 INFO L225 Difference]: With dead ends: 56 [2020-08-18 21:13:14,534 INFO L226 Difference]: Without dead ends: 38 [2020-08-18 21:13:14,534 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 21:13:14,535 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-18 21:13:14,539 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-18 21:13:14,539 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-18 21:13:14,540 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-18 21:13:14,540 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-18 21:13:14,541 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:14,541 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-18 21:13:14,541 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-18 21:13:14,541 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-18 21:13:14,542 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-18 21:13:14,542 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:14,542 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 21:13:14,542 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-18 21:13:14,542 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:14,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:14,543 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-18 21:13:14,543 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:14,543 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1546511774] [2020-08-18 21:13:14,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:14,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:14,575 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:14,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:14,587 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:14,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:14,811 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:13:14,811 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1546511774] [2020-08-18 21:13:14,812 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:14,812 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-18 21:13:14,812 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805084864] [2020-08-18 21:13:14,813 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-18 21:13:14,813 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:14,813 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-18 21:13:14,814 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-18 21:13:14,814 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-18 21:13:14,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:14,982 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-18 21:13:14,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-18 21:13:14,983 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-18 21:13:14,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:14,984 INFO L225 Difference]: With dead ends: 58 [2020-08-18 21:13:14,984 INFO L226 Difference]: Without dead ends: 40 [2020-08-18 21:13:14,986 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 21:13:14,986 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-18 21:13:14,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-18 21:13:14,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-18 21:13:14,997 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-18 21:13:14,997 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-18 21:13:14,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:14,999 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-18 21:13:14,999 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-18 21:13:15,000 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-18 21:13:15,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-18 21:13:15,003 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:15,003 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 21:13:15,004 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-18 21:13:15,004 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:15,004 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:15,004 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-18 21:13:15,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:15,005 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1317521093] [2020-08-18 21:13:15,005 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:15,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,081 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:15,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,100 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:15,112 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,376 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:13:15,377 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1317521093] [2020-08-18 21:13:15,377 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:15,377 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-18 21:13:15,377 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1087827166] [2020-08-18 21:13:15,378 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-18 21:13:15,378 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:15,378 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-18 21:13:15,378 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-18 21:13:15,379 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-18 21:13:15,578 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:15,579 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-18 21:13:15,579 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-18 21:13:15,579 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-18 21:13:15,579 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:15,580 INFO L225 Difference]: With dead ends: 60 [2020-08-18 21:13:15,580 INFO L226 Difference]: Without dead ends: 42 [2020-08-18 21:13:15,581 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 21:13:15,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-18 21:13:15,586 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-18 21:13:15,586 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-18 21:13:15,587 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-18 21:13:15,587 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-18 21:13:15,587 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:15,587 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-18 21:13:15,587 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-18 21:13:15,588 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-18 21:13:15,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-18 21:13:15,588 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:15,589 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 21:13:15,589 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-18 21:13:15,589 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:15,589 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:15,590 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-18 21:13:15,590 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:15,590 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1814430881] [2020-08-18 21:13:15,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:15,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,623 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:15,624 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,642 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:15,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:15,913 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:13:15,914 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1814430881] [2020-08-18 21:13:15,914 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:15,914 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-18 21:13:15,914 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2137864667] [2020-08-18 21:13:15,915 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-18 21:13:15,915 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:15,915 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-18 21:13:15,916 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-18 21:13:15,916 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-18 21:13:16,101 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:16,101 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-18 21:13:16,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-18 21:13:16,102 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-18 21:13:16,102 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:16,103 INFO L225 Difference]: With dead ends: 62 [2020-08-18 21:13:16,103 INFO L226 Difference]: Without dead ends: 44 [2020-08-18 21:13:16,104 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 21:13:16,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-18 21:13:16,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-18 21:13:16,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-18 21:13:16,109 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-18 21:13:16,109 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-18 21:13:16,110 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:16,110 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-18 21:13:16,110 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-18 21:13:16,110 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-18 21:13:16,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-18 21:13:16,111 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:16,111 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 21:13:16,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-18 21:13:16,111 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:16,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:16,112 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-18 21:13:16,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:16,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1423351429] [2020-08-18 21:13:16,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:16,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,143 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:16,144 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:16,163 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,501 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-18 21:13:16,502 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1423351429] [2020-08-18 21:13:16,502 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:16,502 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-18 21:13:16,502 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [953674893] [2020-08-18 21:13:16,504 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-18 21:13:16,504 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:16,504 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-18 21:13:16,505 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-18 21:13:16,506 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-18 21:13:16,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:16,727 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-18 21:13:16,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-18 21:13:16,727 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-18 21:13:16,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:16,728 INFO L225 Difference]: With dead ends: 64 [2020-08-18 21:13:16,728 INFO L226 Difference]: Without dead ends: 46 [2020-08-18 21:13:16,729 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 21:13:16,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-18 21:13:16,736 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-18 21:13:16,737 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-18 21:13:16,738 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-18 21:13:16,739 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-18 21:13:16,739 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:16,739 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-18 21:13:16,739 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-18 21:13:16,739 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-18 21:13:16,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-18 21:13:16,741 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:16,741 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 21:13:16,741 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-18 21:13:16,741 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:16,742 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:16,742 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-18 21:13:16,742 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:16,743 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [182209839] [2020-08-18 21:13:16,743 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:16,759 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,786 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:16,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,801 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:16,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,817 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 21:13:16,817 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [182209839] [2020-08-18 21:13:16,817 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:13:16,818 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 21:13:16,818 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1804254988] [2020-08-18 21:13:16,818 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:13:16,819 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:16,819 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:13:16,819 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:13:16,819 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-18 21:13:16,904 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:16,905 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-18 21:13:16,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 21:13:16,905 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-18 21:13:16,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:16,908 INFO L225 Difference]: With dead ends: 65 [2020-08-18 21:13:16,908 INFO L226 Difference]: Without dead ends: 53 [2020-08-18 21:13:16,909 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 21:13:16,909 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-18 21:13:16,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-18 21:13:16,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-18 21:13:16,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-18 21:13:16,918 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-18 21:13:16,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:16,918 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-18 21:13:16,918 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:13:16,918 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-18 21:13:16,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-18 21:13:16,919 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:16,919 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 21:13:16,919 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-18 21:13:16,920 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:16,920 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:16,920 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-18 21:13:16,920 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:16,920 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [353696945] [2020-08-18 21:13:16,921 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:16,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,961 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:16,962 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:16,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:16,984 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 21:13:16,984 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [353696945] [2020-08-18 21:13:16,985 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:16,985 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-18 21:13:16,985 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1999922358] [2020-08-18 21:13:16,985 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-18 21:13:16,986 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:16,986 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-18 21:13:16,986 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-18 21:13:16,986 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-18 21:13:17,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:17,075 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-18 21:13:17,076 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-18 21:13:17,076 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-18 21:13:17,076 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:17,077 INFO L225 Difference]: With dead ends: 73 [2020-08-18 21:13:17,077 INFO L226 Difference]: Without dead ends: 61 [2020-08-18 21:13:17,078 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 21:13:17,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-18 21:13:17,084 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-18 21:13:17,084 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 21:13:17,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-18 21:13:17,086 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-18 21:13:17,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:17,086 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-18 21:13:17,086 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-18 21:13:17,087 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-18 21:13:17,090 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 21:13:17,090 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:17,090 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 21:13:17,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-18 21:13:17,091 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:17,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:17,091 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-18 21:13:17,091 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:17,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1772482835] [2020-08-18 21:13:17,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:17,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:17,155 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:17,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:17,171 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:17,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:17,185 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 21:13:17,185 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1772482835] [2020-08-18 21:13:17,185 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-18 21:13:17,185 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-18 21:13:17,186 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113006180] [2020-08-18 21:13:17,186 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-18 21:13:17,186 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:17,187 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-18 21:13:17,188 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-18 21:13:17,188 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-18 21:13:17,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:17,276 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-18 21:13:17,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-18 21:13:17,276 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-18 21:13:17,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:17,280 INFO L225 Difference]: With dead ends: 69 [2020-08-18 21:13:17,280 INFO L226 Difference]: Without dead ends: 49 [2020-08-18 21:13:17,281 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 21:13:17,281 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-18 21:13:17,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-18 21:13:17,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-18 21:13:17,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-18 21:13:17,295 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-18 21:13:17,295 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:17,295 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-18 21:13:17,298 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-18 21:13:17,298 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-18 21:13:17,299 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-18 21:13:17,299 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:17,299 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 21:13:17,299 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-18 21:13:17,300 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:17,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:17,300 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-18 21:13:17,300 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:17,305 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2136774462] [2020-08-18 21:13:17,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:17,341 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:17,409 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:17,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:17,426 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:17,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:17,871 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 21:13:17,872 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2136774462] [2020-08-18 21:13:17,872 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:17,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-18 21:13:17,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1883756240] [2020-08-18 21:13:17,874 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-18 21:13:17,874 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:17,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-18 21:13:17,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-18 21:13:17,875 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-18 21:13:18,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:18,085 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-18 21:13:18,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-18 21:13:18,085 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-18 21:13:18,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:18,086 INFO L225 Difference]: With dead ends: 74 [2020-08-18 21:13:18,086 INFO L226 Difference]: Without dead ends: 52 [2020-08-18 21:13:18,087 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 21:13:18,087 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-18 21:13:18,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-18 21:13:18,092 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-18 21:13:18,092 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-18 21:13:18,092 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-18 21:13:18,092 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:18,093 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-18 21:13:18,093 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-18 21:13:18,093 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-18 21:13:18,093 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-18 21:13:18,093 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:18,094 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 21:13:18,094 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-18 21:13:18,094 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:18,094 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:18,094 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-18 21:13:18,095 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:18,095 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [393908398] [2020-08-18 21:13:18,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:18,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:18,125 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:18,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:18,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:18,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:18,582 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 21:13:18,583 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [393908398] [2020-08-18 21:13:18,583 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:18,583 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-18 21:13:18,583 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1965483579] [2020-08-18 21:13:18,584 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-18 21:13:18,584 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:18,584 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-18 21:13:18,585 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-18 21:13:18,585 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-18 21:13:18,788 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:18,788 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-18 21:13:18,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-18 21:13:18,789 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-18 21:13:18,789 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:18,790 INFO L225 Difference]: With dead ends: 76 [2020-08-18 21:13:18,790 INFO L226 Difference]: Without dead ends: 54 [2020-08-18 21:13:18,791 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 21:13:18,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-18 21:13:18,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-18 21:13:18,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-18 21:13:18,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-18 21:13:18,795 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-18 21:13:18,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:18,796 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-18 21:13:18,796 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-18 21:13:18,796 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-18 21:13:18,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-18 21:13:18,797 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:18,797 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 21:13:18,797 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-18 21:13:18,797 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:18,798 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:18,798 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-18 21:13:18,798 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:18,798 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [610130978] [2020-08-18 21:13:18,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:18,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:18,831 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:18,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:18,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:18,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:19,287 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 21:13:19,288 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [610130978] [2020-08-18 21:13:19,291 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:19,291 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-18 21:13:19,291 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [655726393] [2020-08-18 21:13:19,292 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-18 21:13:19,292 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:19,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-18 21:13:19,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-18 21:13:19,293 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-18 21:13:19,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:19,554 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-18 21:13:19,555 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-18 21:13:19,555 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-18 21:13:19,556 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:19,557 INFO L225 Difference]: With dead ends: 78 [2020-08-18 21:13:19,557 INFO L226 Difference]: Without dead ends: 56 [2020-08-18 21:13:19,558 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 21:13:19,560 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-18 21:13:19,571 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-18 21:13:19,571 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-18 21:13:19,572 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-18 21:13:19,572 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-18 21:13:19,572 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:19,573 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-18 21:13:19,573 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-18 21:13:19,573 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-18 21:13:19,574 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-18 21:13:19,574 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:19,574 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 21:13:19,574 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-18 21:13:19,575 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:19,575 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:19,575 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-18 21:13:19,576 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:19,576 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [532763822] [2020-08-18 21:13:19,576 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:19,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:19,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:19,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:19,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:19,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:20,170 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 21:13:20,170 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [532763822] [2020-08-18 21:13:20,170 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:20,171 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-18 21:13:20,171 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1423609661] [2020-08-18 21:13:20,171 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-18 21:13:20,171 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:20,172 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-18 21:13:20,172 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-18 21:13:20,172 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-18 21:13:20,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:20,407 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-18 21:13:20,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-18 21:13:20,408 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-18 21:13:20,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:20,409 INFO L225 Difference]: With dead ends: 80 [2020-08-18 21:13:20,409 INFO L226 Difference]: Without dead ends: 58 [2020-08-18 21:13:20,410 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 21:13:20,410 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-18 21:13:20,415 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-18 21:13:20,415 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-18 21:13:20,415 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-18 21:13:20,415 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-18 21:13:20,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:20,416 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-18 21:13:20,416 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-18 21:13:20,416 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-18 21:13:20,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-18 21:13:20,416 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:20,416 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 21:13:20,417 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-18 21:13:20,417 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:20,417 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:20,417 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-18 21:13:20,417 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:20,417 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [895063342] [2020-08-18 21:13:20,417 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:20,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:20,455 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:20,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:20,465 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:20,474 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:21,016 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 21:13:21,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [895063342] [2020-08-18 21:13:21,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:21,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-18 21:13:21,017 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [344196120] [2020-08-18 21:13:21,017 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-18 21:13:21,017 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:21,017 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-18 21:13:21,018 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-18 21:13:21,018 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-18 21:13:21,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:21,270 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-18 21:13:21,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-18 21:13:21,271 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-18 21:13:21,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:21,272 INFO L225 Difference]: With dead ends: 82 [2020-08-18 21:13:21,272 INFO L226 Difference]: Without dead ends: 60 [2020-08-18 21:13:21,273 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-18 21:13:21,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-18 21:13:21,278 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-18 21:13:21,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-18 21:13:21,278 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-18 21:13:21,278 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-18 21:13:21,279 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:21,279 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-18 21:13:21,279 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-18 21:13:21,279 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-18 21:13:21,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-18 21:13:21,279 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:21,280 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 21:13:21,280 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-18 21:13:21,280 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:21,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:21,280 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-18 21:13:21,281 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:21,281 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [957999842] [2020-08-18 21:13:21,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:21,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:21,321 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:21,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:21,331 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:21,343 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:21,918 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 21:13:21,918 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [957999842] [2020-08-18 21:13:21,918 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:21,919 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-18 21:13:21,919 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [726830591] [2020-08-18 21:13:21,919 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-18 21:13:21,919 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:21,920 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-18 21:13:21,920 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-18 21:13:21,920 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-18 21:13:22,167 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:22,167 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-18 21:13:22,173 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-18 21:13:22,173 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-18 21:13:22,173 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:22,174 INFO L225 Difference]: With dead ends: 84 [2020-08-18 21:13:22,174 INFO L226 Difference]: Without dead ends: 62 [2020-08-18 21:13:22,174 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 21:13:22,175 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-18 21:13:22,179 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-18 21:13:22,179 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-18 21:13:22,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-18 21:13:22,179 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-18 21:13:22,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:22,180 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-18 21:13:22,180 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-18 21:13:22,180 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-18 21:13:22,180 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-18 21:13:22,181 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:22,181 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 21:13:22,181 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-18 21:13:22,181 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:22,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:22,181 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-18 21:13:22,182 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:22,182 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [263313559] [2020-08-18 21:13:22,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:22,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:22,233 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:22,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:22,243 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:22,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:22,894 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 21:13:22,894 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [263313559] [2020-08-18 21:13:22,894 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:22,894 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-18 21:13:22,895 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1299582911] [2020-08-18 21:13:22,895 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-18 21:13:22,895 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:22,895 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-18 21:13:22,896 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-18 21:13:22,896 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-18 21:13:23,136 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:23,136 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-18 21:13:23,136 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-18 21:13:23,137 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-18 21:13:23,137 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:23,137 INFO L225 Difference]: With dead ends: 86 [2020-08-18 21:13:23,138 INFO L226 Difference]: Without dead ends: 64 [2020-08-18 21:13:23,138 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 21:13:23,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-18 21:13:23,145 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-18 21:13:23,145 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-18 21:13:23,146 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-18 21:13:23,146 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-18 21:13:23,146 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:23,146 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-18 21:13:23,146 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-18 21:13:23,146 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-18 21:13:23,150 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-18 21:13:23,150 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:23,150 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 21:13:23,150 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-18 21:13:23,151 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:23,153 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:23,154 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-18 21:13:23,154 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:23,154 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [275449461] [2020-08-18 21:13:23,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:23,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:23,210 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:23,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:23,220 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:23,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:24,006 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 21:13:24,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [275449461] [2020-08-18 21:13:24,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:24,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-18 21:13:24,008 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [289982246] [2020-08-18 21:13:24,009 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-18 21:13:24,010 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:24,010 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-18 21:13:24,010 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-18 21:13:24,010 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-18 21:13:24,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:24,255 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-18 21:13:24,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-18 21:13:24,256 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-18 21:13:24,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:24,257 INFO L225 Difference]: With dead ends: 88 [2020-08-18 21:13:24,257 INFO L226 Difference]: Without dead ends: 66 [2020-08-18 21:13:24,258 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=223, Invalid=377, Unknown=0, NotChecked=0, Total=600 [2020-08-18 21:13:24,258 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-18 21:13:24,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-18 21:13:24,261 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-18 21:13:24,262 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-18 21:13:24,262 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-18 21:13:24,262 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:24,262 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-18 21:13:24,263 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-18 21:13:24,263 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-18 21:13:24,263 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-18 21:13:24,263 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:24,263 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 21:13:24,264 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-18 21:13:24,264 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:24,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:24,264 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-18 21:13:24,264 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:24,264 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [413232304] [2020-08-18 21:13:24,265 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:24,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:24,309 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:24,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:24,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:24,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:25,090 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 21:13:25,090 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [413232304] [2020-08-18 21:13:25,090 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:25,090 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-18 21:13:25,091 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760946206] [2020-08-18 21:13:25,091 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-18 21:13:25,091 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:25,091 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-18 21:13:25,092 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-18 21:13:25,092 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-18 21:13:25,397 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:25,398 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-18 21:13:25,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-18 21:13:25,399 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-18 21:13:25,399 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:25,400 INFO L225 Difference]: With dead ends: 90 [2020-08-18 21:13:25,400 INFO L226 Difference]: Without dead ends: 68 [2020-08-18 21:13:25,401 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=244, Invalid=406, Unknown=0, NotChecked=0, Total=650 [2020-08-18 21:13:25,401 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-18 21:13:25,404 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-18 21:13:25,404 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-18 21:13:25,405 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-18 21:13:25,405 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-18 21:13:25,405 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:25,405 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-18 21:13:25,405 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-18 21:13:25,405 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-18 21:13:25,406 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-18 21:13:25,406 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:25,406 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 21:13:25,406 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-18 21:13:25,406 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:25,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:25,407 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-18 21:13:25,407 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:25,407 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1377878074] [2020-08-18 21:13:25,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:25,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:25,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:25,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:25,461 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:25,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:26,520 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 21:13:26,525 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1377878074] [2020-08-18 21:13:26,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:26,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-18 21:13:26,527 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1218979387] [2020-08-18 21:13:26,528 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-18 21:13:26,530 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:26,531 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-18 21:13:26,531 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-18 21:13:26,532 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-18 21:13:26,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:26,777 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-18 21:13:26,778 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-18 21:13:26,778 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-18 21:13:26,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:26,778 INFO L225 Difference]: With dead ends: 92 [2020-08-18 21:13:26,778 INFO L226 Difference]: Without dead ends: 70 [2020-08-18 21:13:26,779 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-18 21:13:26,780 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-18 21:13:26,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-18 21:13:26,784 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-18 21:13:26,785 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-18 21:13:26,785 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-18 21:13:26,785 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:26,785 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-18 21:13:26,785 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-18 21:13:26,785 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-18 21:13:26,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-18 21:13:26,786 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:26,786 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 21:13:26,786 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-18 21:13:26,786 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:26,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:26,787 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-18 21:13:26,787 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:26,787 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [784327999] [2020-08-18 21:13:26,787 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:26,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:26,833 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:26,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:26,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:26,854 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:27,694 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 21:13:27,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [784327999] [2020-08-18 21:13:27,695 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:27,695 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-18 21:13:27,695 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112544146] [2020-08-18 21:13:27,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-18 21:13:27,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:27,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-18 21:13:27,696 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-18 21:13:27,696 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-18 21:13:27,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:27,982 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-18 21:13:27,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-18 21:13:27,982 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-18 21:13:27,982 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:27,983 INFO L225 Difference]: With dead ends: 94 [2020-08-18 21:13:27,983 INFO L226 Difference]: Without dead ends: 72 [2020-08-18 21:13:27,984 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-18 21:13:27,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-18 21:13:27,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-18 21:13:27,988 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-18 21:13:27,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-18 21:13:27,989 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-18 21:13:27,989 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:27,989 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-18 21:13:27,989 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-18 21:13:27,989 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-18 21:13:27,990 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-18 21:13:27,990 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:27,990 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 21:13:27,991 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-18 21:13:27,993 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:27,993 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:27,993 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-18 21:13:27,994 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:27,994 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1735448156] [2020-08-18 21:13:27,994 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:28,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:28,035 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:28,035 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:28,046 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:28,057 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:29,006 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 21:13:29,006 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1735448156] [2020-08-18 21:13:29,006 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:29,006 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-18 21:13:29,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569145844] [2020-08-18 21:13:29,007 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-18 21:13:29,007 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:29,007 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-18 21:13:29,008 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-18 21:13:29,008 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-18 21:13:29,331 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:29,331 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-18 21:13:29,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-18 21:13:29,332 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-18 21:13:29,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:29,333 INFO L225 Difference]: With dead ends: 96 [2020-08-18 21:13:29,333 INFO L226 Difference]: Without dead ends: 74 [2020-08-18 21:13:29,333 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=313, Invalid=499, Unknown=0, NotChecked=0, Total=812 [2020-08-18 21:13:29,334 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-18 21:13:29,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-18 21:13:29,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-18 21:13:29,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-18 21:13:29,337 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-18 21:13:29,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:29,338 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-18 21:13:29,338 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-18 21:13:29,338 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-18 21:13:29,338 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-18 21:13:29,339 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:29,339 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 21:13:29,339 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-18 21:13:29,339 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:29,339 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:29,339 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-18 21:13:29,340 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:29,340 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1923848730] [2020-08-18 21:13:29,340 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:29,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:29,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:29,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:29,397 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:29,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:30,381 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 21:13:30,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1923848730] [2020-08-18 21:13:30,382 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:30,382 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-18 21:13:30,382 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420187175] [2020-08-18 21:13:30,382 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-18 21:13:30,382 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:30,383 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-18 21:13:30,383 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-18 21:13:30,383 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-18 21:13:30,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:30,600 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-18 21:13:30,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-18 21:13:30,600 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-18 21:13:30,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:30,601 INFO L225 Difference]: With dead ends: 98 [2020-08-18 21:13:30,601 INFO L226 Difference]: Without dead ends: 76 [2020-08-18 21:13:30,602 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-18 21:13:30,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-18 21:13:30,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-18 21:13:30,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-18 21:13:30,606 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-18 21:13:30,606 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-18 21:13:30,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:30,607 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-18 21:13:30,607 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-18 21:13:30,607 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-18 21:13:30,607 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-18 21:13:30,607 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:30,607 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 21:13:30,608 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-18 21:13:30,608 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:30,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:30,608 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-18 21:13:30,608 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:30,608 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2015711839] [2020-08-18 21:13:30,609 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:30,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:30,655 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:30,656 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:30,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:30,680 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:31,693 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 21:13:31,694 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2015711839] [2020-08-18 21:13:31,694 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:31,694 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-18 21:13:31,694 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940376567] [2020-08-18 21:13:31,695 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-18 21:13:31,695 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:31,695 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-18 21:13:31,695 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-18 21:13:31,696 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-18 21:13:32,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:32,011 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-18 21:13:32,011 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-18 21:13:32,011 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-18 21:13:32,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:32,012 INFO L225 Difference]: With dead ends: 100 [2020-08-18 21:13:32,012 INFO L226 Difference]: Without dead ends: 78 [2020-08-18 21:13:32,013 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-18 21:13:32,014 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-18 21:13:32,016 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-18 21:13:32,016 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-18 21:13:32,017 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-18 21:13:32,017 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-18 21:13:32,017 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:32,018 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-18 21:13:32,018 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-18 21:13:32,018 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-18 21:13:32,018 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-18 21:13:32,019 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:32,019 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 21:13:32,019 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-18 21:13:32,019 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:32,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:32,020 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-18 21:13:32,020 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:32,020 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [775789229] [2020-08-18 21:13:32,020 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:32,049 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:32,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:32,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:32,085 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:32,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:33,178 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 21:13:33,178 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [775789229] [2020-08-18 21:13:33,178 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:33,179 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-18 21:13:33,179 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [194685564] [2020-08-18 21:13:33,179 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-18 21:13:33,179 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:33,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-18 21:13:33,180 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-18 21:13:33,180 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-18 21:13:33,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:33,544 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-18 21:13:33,545 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-18 21:13:33,545 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-18 21:13:33,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:33,546 INFO L225 Difference]: With dead ends: 102 [2020-08-18 21:13:33,546 INFO L226 Difference]: Without dead ends: 80 [2020-08-18 21:13:33,547 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=391, Invalid=601, Unknown=0, NotChecked=0, Total=992 [2020-08-18 21:13:33,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-18 21:13:33,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-18 21:13:33,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-18 21:13:33,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-18 21:13:33,551 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-18 21:13:33,551 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:33,551 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-18 21:13:33,552 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-18 21:13:33,552 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-18 21:13:33,552 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-18 21:13:33,552 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:33,552 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 21:13:33,553 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-18 21:13:33,553 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:33,553 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:33,553 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-18 21:13:33,553 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:33,553 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [489496070] [2020-08-18 21:13:33,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:33,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:33,604 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:33,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:33,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:33,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:34,851 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 21:13:34,851 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [489496070] [2020-08-18 21:13:34,851 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:34,852 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-18 21:13:34,852 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [339902933] [2020-08-18 21:13:34,852 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-18 21:13:34,852 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:34,852 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-18 21:13:34,853 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-18 21:13:34,853 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-18 21:13:35,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:35,137 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-18 21:13:35,138 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-18 21:13:35,138 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-18 21:13:35,139 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:35,139 INFO L225 Difference]: With dead ends: 104 [2020-08-18 21:13:35,139 INFO L226 Difference]: Without dead ends: 82 [2020-08-18 21:13:35,140 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 21:13:35,141 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-18 21:13:35,144 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-18 21:13:35,144 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-18 21:13:35,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-18 21:13:35,144 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-18 21:13:35,145 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:35,145 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-18 21:13:35,145 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-18 21:13:35,145 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-18 21:13:35,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-18 21:13:35,146 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:35,146 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 21:13:35,146 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-18 21:13:35,146 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:35,146 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:35,146 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-18 21:13:35,146 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:35,146 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [754893824] [2020-08-18 21:13:35,147 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:35,165 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:35,194 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:35,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:35,203 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:35,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:36,488 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 21:13:36,488 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [754893824] [2020-08-18 21:13:36,488 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:36,489 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-18 21:13:36,489 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760804002] [2020-08-18 21:13:36,489 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-18 21:13:36,489 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:36,489 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-18 21:13:36,490 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-18 21:13:36,490 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-18 21:13:36,884 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:36,885 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-18 21:13:36,885 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-18 21:13:36,885 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-18 21:13:36,886 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:36,886 INFO L225 Difference]: With dead ends: 106 [2020-08-18 21:13:36,887 INFO L226 Difference]: Without dead ends: 84 [2020-08-18 21:13:36,888 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 21:13:36,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-18 21:13:36,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-18 21:13:36,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-18 21:13:36,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-18 21:13:36,892 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-18 21:13:36,892 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:36,892 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-18 21:13:36,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-18 21:13:36,892 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-18 21:13:36,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-18 21:13:36,893 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:36,893 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 21:13:36,893 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-18 21:13:36,893 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:36,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:36,894 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-18 21:13:36,894 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:36,894 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1145387348] [2020-08-18 21:13:36,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:36,917 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:36,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:36,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:36,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:36,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:38,215 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 21:13:38,216 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1145387348] [2020-08-18 21:13:38,216 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:38,216 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-18 21:13:38,216 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [866850573] [2020-08-18 21:13:38,217 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-18 21:13:38,217 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:38,217 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-18 21:13:38,217 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-18 21:13:38,217 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-18 21:13:38,611 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:38,611 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-18 21:13:38,611 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-18 21:13:38,611 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-18 21:13:38,612 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:38,613 INFO L225 Difference]: With dead ends: 108 [2020-08-18 21:13:38,613 INFO L226 Difference]: Without dead ends: 86 [2020-08-18 21:13:38,614 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 21:13:38,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-18 21:13:38,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-18 21:13:38,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-18 21:13:38,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-18 21:13:38,618 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-18 21:13:38,618 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:38,618 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-18 21:13:38,618 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-18 21:13:38,619 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-18 21:13:38,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-18 21:13:38,619 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:38,619 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 21:13:38,620 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-18 21:13:38,620 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:38,620 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:38,620 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-18 21:13:38,620 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:38,620 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1484854624] [2020-08-18 21:13:38,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:38,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:38,670 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:38,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:38,680 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:38,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:40,085 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 21:13:40,086 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1484854624] [2020-08-18 21:13:40,086 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:40,086 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-18 21:13:40,086 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1205126724] [2020-08-18 21:13:40,087 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-18 21:13:40,087 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:40,087 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-18 21:13:40,088 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-18 21:13:40,088 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-18 21:13:40,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:40,500 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-18 21:13:40,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-18 21:13:40,500 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-18 21:13:40,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:40,502 INFO L225 Difference]: With dead ends: 110 [2020-08-18 21:13:40,502 INFO L226 Difference]: Without dead ends: 88 [2020-08-18 21:13:40,503 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 38 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=509, Invalid=751, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 21:13:40,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-18 21:13:40,506 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-18 21:13:40,507 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-18 21:13:40,507 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-18 21:13:40,507 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-18 21:13:40,508 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:40,508 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-18 21:13:40,508 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-18 21:13:40,508 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-18 21:13:40,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-18 21:13:40,509 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:40,509 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 21:13:40,509 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-18 21:13:40,509 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:40,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:40,509 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-18 21:13:40,510 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:40,510 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [354144474] [2020-08-18 21:13:40,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:40,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:40,558 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:40,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:40,571 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:40,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:42,052 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 21:13:42,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [354144474] [2020-08-18 21:13:42,053 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:42,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-18 21:13:42,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694982828] [2020-08-18 21:13:42,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-18 21:13:42,053 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:42,053 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-18 21:13:42,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-18 21:13:42,054 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-18 21:13:42,495 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:42,495 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-18 21:13:42,496 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-18 21:13:42,496 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-18 21:13:42,496 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:42,497 INFO L225 Difference]: With dead ends: 112 [2020-08-18 21:13:42,497 INFO L226 Difference]: Without dead ends: 90 [2020-08-18 21:13:42,498 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 21:13:42,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-18 21:13:42,502 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-18 21:13:42,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-18 21:13:42,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-18 21:13:42,503 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-18 21:13:42,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:42,503 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-18 21:13:42,503 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-18 21:13:42,503 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-18 21:13:42,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-18 21:13:42,504 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:42,504 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 21:13:42,504 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-18 21:13:42,504 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:42,505 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:42,505 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-18 21:13:42,505 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:42,505 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [769002435] [2020-08-18 21:13:42,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:42,525 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:42,559 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:42,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:42,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:42,592 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:44,128 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 21:13:44,128 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [769002435] [2020-08-18 21:13:44,129 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:44,129 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-18 21:13:44,129 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [516168713] [2020-08-18 21:13:44,129 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-18 21:13:44,129 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:44,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-18 21:13:44,130 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-18 21:13:44,130 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-18 21:13:44,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:44,554 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-18 21:13:44,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-18 21:13:44,558 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-18 21:13:44,559 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:44,559 INFO L225 Difference]: With dead ends: 114 [2020-08-18 21:13:44,559 INFO L226 Difference]: Without dead ends: 92 [2020-08-18 21:13:44,560 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 21:13:44,561 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-18 21:13:44,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-18 21:13:44,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-18 21:13:44,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-18 21:13:44,579 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-18 21:13:44,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:44,580 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-18 21:13:44,584 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-18 21:13:44,584 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-18 21:13:44,585 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-18 21:13:44,585 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:44,585 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 21:13:44,585 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-18 21:13:44,585 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:44,585 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:44,585 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-18 21:13:44,585 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:44,586 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1409421089] [2020-08-18 21:13:44,586 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:44,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:44,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:44,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:44,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:44,691 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:46,329 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 21:13:46,329 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1409421089] [2020-08-18 21:13:46,329 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:46,329 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-18 21:13:46,330 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603615923] [2020-08-18 21:13:46,330 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-18 21:13:46,330 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:46,330 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-18 21:13:46,331 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-18 21:13:46,331 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-18 21:13:46,662 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:46,662 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-18 21:13:46,662 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-18 21:13:46,662 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-18 21:13:46,663 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:46,664 INFO L225 Difference]: With dead ends: 116 [2020-08-18 21:13:46,664 INFO L226 Difference]: Without dead ends: 94 [2020-08-18 21:13:46,665 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 21:13:46,666 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-18 21:13:46,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-18 21:13:46,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-18 21:13:46,670 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-18 21:13:46,670 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-18 21:13:46,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:46,670 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-18 21:13:46,670 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-18 21:13:46,671 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-18 21:13:46,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-18 21:13:46,671 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:46,672 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 21:13:46,672 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-18 21:13:46,672 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:46,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:46,672 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-18 21:13:46,673 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:46,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [527357617] [2020-08-18 21:13:46,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:46,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:46,742 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:46,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:46,752 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:46,769 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,448 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 21:13:48,448 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [527357617] [2020-08-18 21:13:48,448 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:48,448 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-18 21:13:48,448 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [367944578] [2020-08-18 21:13:48,449 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-18 21:13:48,449 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:48,449 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-18 21:13:48,450 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-18 21:13:48,450 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-18 21:13:48,913 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:48,913 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-18 21:13:48,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-18 21:13:48,913 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-18 21:13:48,914 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:48,914 INFO L225 Difference]: With dead ends: 118 [2020-08-18 21:13:48,914 INFO L226 Difference]: Without dead ends: 96 [2020-08-18 21:13:48,915 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 21:13:48,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-18 21:13:48,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-18 21:13:48,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-18 21:13:48,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-18 21:13:48,919 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-18 21:13:48,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:48,920 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-18 21:13:48,920 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-18 21:13:48,920 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-18 21:13:48,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-18 21:13:48,921 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:48,921 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 21:13:48,921 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-18 21:13:48,921 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:48,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:48,921 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-18 21:13:48,922 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:48,922 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1931728580] [2020-08-18 21:13:48,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:48,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,975 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:48,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:48,985 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:49,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:50,792 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 21:13:50,792 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1931728580] [2020-08-18 21:13:50,792 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:50,792 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-18 21:13:50,793 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1414592086] [2020-08-18 21:13:50,793 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-18 21:13:50,793 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:50,794 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-18 21:13:50,794 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-18 21:13:50,794 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-18 21:13:51,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:51,184 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-18 21:13:51,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-18 21:13:51,185 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-18 21:13:51,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:51,186 INFO L225 Difference]: With dead ends: 120 [2020-08-18 21:13:51,186 INFO L226 Difference]: Without dead ends: 98 [2020-08-18 21:13:51,188 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 21:13:51,188 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-18 21:13:51,194 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-18 21:13:51,194 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-18 21:13:51,195 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-18 21:13:51,195 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-18 21:13:51,195 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:51,195 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-18 21:13:51,195 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-18 21:13:51,195 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-18 21:13:51,196 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-18 21:13:51,196 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:51,196 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 21:13:51,196 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-18 21:13:51,199 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:51,200 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:51,200 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-18 21:13:51,200 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:51,200 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [29969596] [2020-08-18 21:13:51,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:51,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:51,254 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:51,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:51,271 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:51,288 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:53,155 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 21:13:53,155 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [29969596] [2020-08-18 21:13:53,156 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:53,156 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-18 21:13:53,156 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [682295487] [2020-08-18 21:13:53,156 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-18 21:13:53,156 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:53,157 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-18 21:13:53,157 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-18 21:13:53,157 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-18 21:13:53,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:53,475 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-18 21:13:53,475 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-18 21:13:53,476 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-18 21:13:53,476 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:53,477 INFO L225 Difference]: With dead ends: 122 [2020-08-18 21:13:53,477 INFO L226 Difference]: Without dead ends: 100 [2020-08-18 21:13:53,478 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 21:13:53,478 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-18 21:13:53,481 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-18 21:13:53,481 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-18 21:13:53,482 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-18 21:13:53,482 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-18 21:13:53,482 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:53,482 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-18 21:13:53,482 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-18 21:13:53,482 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-18 21:13:53,483 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-18 21:13:53,483 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:53,483 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 21:13:53,484 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-18 21:13:53,484 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:53,484 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:53,484 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-18 21:13:53,484 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:53,484 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [825557408] [2020-08-18 21:13:53,485 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:53,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:53,543 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:53,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:53,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:53,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:55,628 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 21:13:55,628 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [825557408] [2020-08-18 21:13:55,628 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:55,628 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-18 21:13:55,629 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013221709] [2020-08-18 21:13:55,629 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-18 21:13:55,629 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:55,629 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-18 21:13:55,630 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-18 21:13:55,630 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-18 21:13:55,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:55,919 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-18 21:13:55,919 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-18 21:13:55,919 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-18 21:13:55,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:55,920 INFO L225 Difference]: With dead ends: 124 [2020-08-18 21:13:55,920 INFO L226 Difference]: Without dead ends: 102 [2020-08-18 21:13:55,921 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 21:13:55,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-18 21:13:55,925 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-18 21:13:55,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-18 21:13:55,926 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-18 21:13:55,926 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-18 21:13:55,927 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:55,927 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-18 21:13:55,927 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-18 21:13:55,927 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-18 21:13:55,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-18 21:13:55,928 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:55,928 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 21:13:55,928 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-18 21:13:55,928 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:55,929 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:55,929 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-18 21:13:55,929 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:55,929 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [794732053] [2020-08-18 21:13:55,929 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:55,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:56,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:56,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:56,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:56,039 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:58,112 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 21:13:58,113 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [794732053] [2020-08-18 21:13:58,113 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:13:58,113 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-18 21:13:58,113 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [246244914] [2020-08-18 21:13:58,113 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-18 21:13:58,113 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:13:58,114 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-18 21:13:58,114 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-18 21:13:58,114 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-18 21:13:58,430 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:13:58,430 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-18 21:13:58,431 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-18 21:13:58,431 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-18 21:13:58,431 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:13:58,432 INFO L225 Difference]: With dead ends: 126 [2020-08-18 21:13:58,432 INFO L226 Difference]: Without dead ends: 104 [2020-08-18 21:13:58,433 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 21:13:58,433 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-18 21:13:58,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-18 21:13:58,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-18 21:13:58,437 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-18 21:13:58,437 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-18 21:13:58,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:13:58,438 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-18 21:13:58,438 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-18 21:13:58,438 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-18 21:13:58,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-18 21:13:58,438 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:13:58,439 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 21:13:58,439 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-18 21:13:58,439 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:13:58,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:13:58,439 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-18 21:13:58,439 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:13:58,439 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [139444286] [2020-08-18 21:13:58,439 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:13:58,459 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:58,495 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:13:58,495 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:13:58,504 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:13:58,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:00,687 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 21:14:00,687 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [139444286] [2020-08-18 21:14:00,687 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:00,687 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-18 21:14:00,687 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440466648] [2020-08-18 21:14:00,688 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-18 21:14:00,688 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:00,688 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-18 21:14:00,689 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-18 21:14:00,689 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-18 21:14:01,102 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:01,103 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-18 21:14:01,103 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-18 21:14:01,103 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-18 21:14:01,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:01,104 INFO L225 Difference]: With dead ends: 128 [2020-08-18 21:14:01,105 INFO L226 Difference]: Without dead ends: 106 [2020-08-18 21:14:01,106 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-18 21:14:01,106 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-18 21:14:01,109 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-18 21:14:01,110 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-18 21:14:01,110 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-18 21:14:01,110 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-18 21:14:01,111 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:01,111 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-18 21:14:01,111 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-18 21:14:01,111 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-18 21:14:01,111 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-18 21:14:01,111 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:01,112 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 21:14:01,112 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-18 21:14:01,112 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:01,112 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:01,112 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-18 21:14:01,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:01,113 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1857993860] [2020-08-18 21:14:01,113 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:01,135 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:01,172 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:01,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:01,182 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:14:01,199 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:03,475 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 21:14:03,475 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1857993860] [2020-08-18 21:14:03,475 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:03,475 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-18 21:14:03,475 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1435198325] [2020-08-18 21:14:03,476 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-18 21:14:03,476 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:03,476 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-18 21:14:03,477 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-18 21:14:03,477 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-18 21:14:04,013 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:04,014 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-18 21:14:04,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-18 21:14:04,014 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-18 21:14:04,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:04,016 INFO L225 Difference]: With dead ends: 130 [2020-08-18 21:14:04,016 INFO L226 Difference]: Without dead ends: 108 [2020-08-18 21:14:04,017 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-18 21:14:04,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-18 21:14:04,025 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-18 21:14:04,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-18 21:14:04,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-18 21:14:04,026 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-18 21:14:04,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:04,027 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-18 21:14:04,027 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-18 21:14:04,027 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-18 21:14:04,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-18 21:14:04,029 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:04,029 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 21:14:04,029 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-18 21:14:04,029 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:04,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:04,029 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-18 21:14:04,030 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:04,030 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [622615133] [2020-08-18 21:14:04,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:04,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:04,121 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:04,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:04,135 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:14:04,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,526 INFO L134 CoverageAnalysis]: Checked inductivity of 1449 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-18 21:14:06,526 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [622615133] [2020-08-18 21:14:06,526 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-18 21:14:06,526 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-18 21:14:06,526 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1615203171] [2020-08-18 21:14:06,527 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-18 21:14:06,527 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-18 21:14:06,527 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-18 21:14:06,528 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=1066, Unknown=0, NotChecked=0, Total=1892 [2020-08-18 21:14:06,528 INFO L87 Difference]: Start difference. First operand 107 states and 110 transitions. Second operand 44 states. [2020-08-18 21:14:06,880 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-18 21:14:06,880 INFO L93 Difference]: Finished difference Result 132 states and 138 transitions. [2020-08-18 21:14:06,881 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-18 21:14:06,881 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 102 [2020-08-18 21:14:06,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-18 21:14:06,882 INFO L225 Difference]: With dead ends: 132 [2020-08-18 21:14:06,882 INFO L226 Difference]: Without dead ends: 110 [2020-08-18 21:14:06,883 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=916, Invalid=1246, Unknown=0, NotChecked=0, Total=2162 [2020-08-18 21:14:06,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-18 21:14:06,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-18 21:14:06,887 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-18 21:14:06,887 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 112 transitions. [2020-08-18 21:14:06,887 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 112 transitions. Word has length 102 [2020-08-18 21:14:06,887 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-18 21:14:06,888 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 112 transitions. [2020-08-18 21:14:06,888 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-18 21:14:06,888 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 112 transitions. [2020-08-18 21:14:06,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-18 21:14:06,888 INFO L414 BasicCegarLoop]: Found error trace [2020-08-18 21:14:06,889 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 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 21:14:06,889 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-18 21:14:06,889 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-18 21:14:06,889 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-18 21:14:06,889 INFO L82 PathProgramCache]: Analyzing trace with hash 1792330740, now seen corresponding path program 31 times [2020-08-18 21:14:06,889 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-18 21:14:06,889 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1403650627] [2020-08-18 21:14:06,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-18 21:14:06,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,953 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-18 21:14:06,953 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-18 21:14:06,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-18 21:14:06,986 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat