/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=WIDESTAMONGSMALL --traceabstraction.additional.smt.options tolerance=0.6 -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 [2020-08-19 01:15:42,651 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-19 01:15:42,655 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-19 01:15:42,699 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-19 01:15:42,699 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-19 01:15:42,711 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-19 01:15:42,713 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-19 01:15:42,716 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-19 01:15:42,718 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-19 01:15:42,721 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-19 01:15:42,722 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-19 01:15:42,725 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-19 01:15:42,725 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-19 01:15:42,729 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-19 01:15:42,731 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-19 01:15:42,732 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-19 01:15:42,733 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-19 01:15:42,737 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-19 01:15:42,740 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-19 01:15:42,744 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-19 01:15:42,748 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-19 01:15:42,749 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-19 01:15:42,751 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-19 01:15:42,751 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-19 01:15:42,757 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-19 01:15:42,768 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-19 01:15:42,769 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-19 01:15:42,770 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-19 01:15:42,771 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-19 01:15:42,793 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-19 01:15:42,793 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-19 01:15:42,795 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-19 01:15:42,795 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-19 01:15:42,795 INFO L138 SettingsManager]: * Use SBE=true [2020-08-19 01:15:42,796 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-19 01:15:42,796 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-19 01:15:42,796 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-19 01:15:42,796 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-19 01:15:42,796 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-19 01:15:42,797 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-19 01:15:42,797 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-19 01:15:42,797 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-19 01:15:42,797 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-19 01:15:42,797 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-19 01:15:42,798 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-19 01:15:42,798 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-19 01:15:42,798 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-19 01:15:42,798 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-19 01:15:42,799 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-19 01:15:42,799 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-19 01:15:42,799 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 01:15:42,799 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-19 01:15:42,800 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-19 01:15:42,800 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-19 01:15:42,800 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-19 01:15:42,800 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-19 01:15:42,800 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-19 01:15:42,801 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-19 01:15:42,801 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=WIDESTAMONGSMALL;tolerance=0.6; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5;interpolation-heuristic=WIDESTAMONGSMALL;tolerance=0.6; [2020-08-19 01:15:43,128 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-19 01:15:43,141 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-19 01:15:43,145 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-19 01:15:43,146 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-19 01:15:43,147 INFO L275 PluginConnector]: CDTParser initialized [2020-08-19 01:15:43,148 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-19 01:15:43,243 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8704b31a5/8f6d032505034af1aaa9aa2f792da61e/FLAG2597afcac [2020-08-19 01:15:43,745 INFO L306 CDTParser]: Found 1 translation units. [2020-08-19 01:15:43,746 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-19 01:15:43,755 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8704b31a5/8f6d032505034af1aaa9aa2f792da61e/FLAG2597afcac [2020-08-19 01:15:44,165 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/8704b31a5/8f6d032505034af1aaa9aa2f792da61e [2020-08-19 01:15:44,174 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-19 01:15:44,176 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-19 01:15:44,177 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-19 01:15:44,177 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-19 01:15:44,181 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-19 01:15:44,182 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:15:44" (1/1) ... [2020-08-19 01:15:44,184 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4839a71c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:15:44, skipping insertion in model container [2020-08-19 01:15:44,184 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.08 01:15:44" (1/1) ... [2020-08-19 01:15:44,191 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-19 01:15:44,207 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-19 01:15:44,402 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 01:15:44,408 INFO L203 MainTranslator]: Completed pre-run [2020-08-19 01:15:44,423 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-19 01:15:44,437 INFO L208 MainTranslator]: Completed translation [2020-08-19 01:15:44,437 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:15:44 WrapperNode [2020-08-19 01:15:44,437 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-19 01:15:44,438 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-19 01:15:44,438 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-19 01:15:44,438 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-19 01:15:44,522 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:15:44" (1/1) ... [2020-08-19 01:15:44,522 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:15:44" (1/1) ... [2020-08-19 01:15:44,532 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:15:44" (1/1) ... [2020-08-19 01:15:44,533 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:15:44" (1/1) ... [2020-08-19 01:15:44,546 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:15:44" (1/1) ... [2020-08-19 01:15:44,551 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:15:44" (1/1) ... [2020-08-19 01:15:44,552 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:15:44" (1/1) ... [2020-08-19 01:15:44,555 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-19 01:15:44,555 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-19 01:15:44,555 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-19 01:15:44,555 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-19 01:15:44,556 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:15:44" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-19 01:15:44,614 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-19 01:15:44,615 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-19 01:15:44,615 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-19 01:15:44,615 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-19 01:15:44,616 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-19 01:15:44,616 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-19 01:15:44,616 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-19 01:15:44,616 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-19 01:15:44,616 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-19 01:15:44,617 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-19 01:15:44,617 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-19 01:15:44,617 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-19 01:15:44,617 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-19 01:15:44,618 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-19 01:15:44,618 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-19 01:15:44,618 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-19 01:15:44,618 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-19 01:15:44,619 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-19 01:15:44,943 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-19 01:15:44,943 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-19 01:15:44,947 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:15:44 BoogieIcfgContainer [2020-08-19 01:15:44,947 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-19 01:15:44,948 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-19 01:15:44,948 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-19 01:15:44,952 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-19 01:15:44,952 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.08 01:15:44" (1/3) ... [2020-08-19 01:15:44,953 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18d60ee3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:15:44, skipping insertion in model container [2020-08-19 01:15:44,953 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.08 01:15:44" (2/3) ... [2020-08-19 01:15:44,953 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@18d60ee3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.08 01:15:44, skipping insertion in model container [2020-08-19 01:15:44,954 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.08 01:15:44" (3/3) ... [2020-08-19 01:15:44,955 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-19 01:15:44,964 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-19 01:15:44,970 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-19 01:15:44,982 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-19 01:15:45,004 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-19 01:15:45,004 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-19 01:15:45,004 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-19 01:15:45,004 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-19 01:15:45,004 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-19 01:15:45,005 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-19 01:15:45,005 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-19 01:15:45,005 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-19 01:15:45,022 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-19 01:15:45,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 01:15:45,029 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:45,030 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] [2020-08-19 01:15:45,031 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:45,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:45,037 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-19 01:15:45,044 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:45,045 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [291999797] [2020-08-19 01:15:45,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:45,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:45,223 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:45,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:45,252 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:45,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:45,267 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:15:45,268 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [291999797] [2020-08-19 01:15:45,270 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:15:45,270 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-19 01:15:45,271 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281291471] [2020-08-19 01:15:45,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-19 01:15:45,278 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:45,292 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-19 01:15:45,293 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-19 01:15:45,295 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-19 01:15:45,454 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:45,455 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-19 01:15:45,456 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-19 01:15:45,457 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-19 01:15:45,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:45,469 INFO L225 Difference]: With dead ends: 59 [2020-08-19 01:15:45,469 INFO L226 Difference]: Without dead ends: 31 [2020-08-19 01:15:45,473 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 [2020-08-19 01:15:45,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-19 01:15:45,517 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-19 01:15:45,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-19 01:15:45,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-19 01:15:45,522 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-19 01:15:45,523 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:45,523 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-19 01:15:45,523 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-19 01:15:45,524 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-19 01:15:45,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-19 01:15:45,525 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:45,525 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] [2020-08-19 01:15:45,526 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-19 01:15:45,526 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:45,526 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:45,527 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-19 01:15:45,527 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:45,528 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [391412473] [2020-08-19 01:15:45,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:45,557 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:45,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:45,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:45,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:45,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:45,721 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:15:45,722 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [391412473] [2020-08-19 01:15:45,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:15:45,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-19 01:15:45,723 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [581459851] [2020-08-19 01:15:45,724 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 01:15:45,725 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:45,725 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 01:15:45,726 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-19 01:15:45,726 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-19 01:15:45,924 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:45,924 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-19 01:15:45,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-19 01:15:45,925 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-19 01:15:45,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:45,926 INFO L225 Difference]: With dead ends: 48 [2020-08-19 01:15:45,927 INFO L226 Difference]: Without dead ends: 30 [2020-08-19 01:15:45,928 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 [2020-08-19 01:15:45,929 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-19 01:15:45,936 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-19 01:15:45,949 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-19 01:15:45,950 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-19 01:15:45,951 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-19 01:15:45,951 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:45,951 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-19 01:15:45,951 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 01:15:45,951 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-19 01:15:45,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-19 01:15:45,952 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:45,952 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] [2020-08-19 01:15:45,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-19 01:15:45,953 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:45,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:45,954 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-19 01:15:45,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:45,955 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1970446238] [2020-08-19 01:15:45,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:45,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:46,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:46,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:46,021 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:46,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:46,137 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:15:46,137 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1970446238] [2020-08-19 01:15:46,138 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:46,138 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-19 01:15:46,138 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1977844263] [2020-08-19 01:15:46,139 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-19 01:15:46,139 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:46,139 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-19 01:15:46,140 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-19 01:15:46,140 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-19 01:15:46,327 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:46,328 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-19 01:15:46,328 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-19 01:15:46,328 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-19 01:15:46,329 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:46,330 INFO L225 Difference]: With dead ends: 50 [2020-08-19 01:15:46,330 INFO L226 Difference]: Without dead ends: 32 [2020-08-19 01:15:46,331 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 [2020-08-19 01:15:46,331 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-19 01:15:46,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-19 01:15:46,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-19 01:15:46,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-19 01:15:46,339 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-19 01:15:46,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:46,339 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-19 01:15:46,340 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-19 01:15:46,340 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-19 01:15:46,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-19 01:15:46,341 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:46,341 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] [2020-08-19 01:15:46,341 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-19 01:15:46,342 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:46,342 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:46,342 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-19 01:15:46,342 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:46,343 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [925535903] [2020-08-19 01:15:46,343 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:46,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:46,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:46,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:46,433 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:46,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:46,600 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:15:46,602 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [925535903] [2020-08-19 01:15:46,602 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:46,602 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-19 01:15:46,602 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [211163934] [2020-08-19 01:15:46,604 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-19 01:15:46,604 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:46,605 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-19 01:15:46,605 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-19 01:15:46,605 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-19 01:15:46,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:46,771 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-19 01:15:46,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-19 01:15:46,772 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-19 01:15:46,772 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:46,773 INFO L225 Difference]: With dead ends: 52 [2020-08-19 01:15:46,773 INFO L226 Difference]: Without dead ends: 34 [2020-08-19 01:15:46,774 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-19 01:15:46,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-19 01:15:46,780 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-19 01:15:46,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-19 01:15:46,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-19 01:15:46,781 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-19 01:15:46,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:46,782 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-19 01:15:46,782 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-19 01:15:46,782 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-19 01:15:46,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-19 01:15:46,783 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:46,783 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] [2020-08-19 01:15:46,784 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-19 01:15:46,784 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:46,784 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:46,784 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-19 01:15:46,785 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:46,785 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1566174444] [2020-08-19 01:15:46,785 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:46,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:46,842 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:46,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:46,863 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:46,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:47,078 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:15:47,079 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1566174444] [2020-08-19 01:15:47,079 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:47,079 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-19 01:15:47,080 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2097349818] [2020-08-19 01:15:47,080 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-19 01:15:47,080 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:47,081 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-19 01:15:47,081 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-19 01:15:47,081 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-19 01:15:47,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:47,256 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-19 01:15:47,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-19 01:15:47,257 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-19 01:15:47,257 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:47,258 INFO L225 Difference]: With dead ends: 54 [2020-08-19 01:15:47,258 INFO L226 Difference]: Without dead ends: 36 [2020-08-19 01:15:47,259 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 [2020-08-19 01:15:47,259 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-19 01:15:47,263 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-19 01:15:47,264 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-19 01:15:47,265 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-19 01:15:47,265 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-19 01:15:47,265 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:47,265 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-19 01:15:47,266 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-19 01:15:47,266 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-19 01:15:47,266 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-19 01:15:47,267 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:47,267 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] [2020-08-19 01:15:47,267 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-19 01:15:47,267 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:47,268 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:47,268 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-19 01:15:47,268 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:47,268 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [564531139] [2020-08-19 01:15:47,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:47,281 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:47,301 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:47,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:47,315 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:47,323 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:47,518 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:15:47,519 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [564531139] [2020-08-19 01:15:47,519 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:47,519 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-19 01:15:47,519 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1418156684] [2020-08-19 01:15:47,525 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-19 01:15:47,525 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:47,526 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-19 01:15:47,526 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-19 01:15:47,526 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-19 01:15:47,741 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:47,741 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-19 01:15:47,742 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-19 01:15:47,742 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-19 01:15:47,742 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:47,743 INFO L225 Difference]: With dead ends: 56 [2020-08-19 01:15:47,743 INFO L226 Difference]: Without dead ends: 38 [2020-08-19 01:15:47,744 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 [2020-08-19 01:15:47,744 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-19 01:15:47,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-19 01:15:47,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-19 01:15:47,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-19 01:15:47,750 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-19 01:15:47,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:47,750 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-19 01:15:47,750 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-19 01:15:47,751 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-19 01:15:47,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-19 01:15:47,752 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:47,752 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] [2020-08-19 01:15:47,752 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-19 01:15:47,752 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:47,753 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:47,753 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-19 01:15:47,753 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:47,753 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1326990705] [2020-08-19 01:15:47,753 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:47,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:47,790 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:47,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:47,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:47,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:48,051 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:15:48,052 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1326990705] [2020-08-19 01:15:48,052 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:48,053 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-19 01:15:48,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [484209776] [2020-08-19 01:15:48,053 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-19 01:15:48,054 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:48,054 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-19 01:15:48,054 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-19 01:15:48,054 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-19 01:15:48,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:48,230 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-19 01:15:48,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-19 01:15:48,230 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-19 01:15:48,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:48,231 INFO L225 Difference]: With dead ends: 58 [2020-08-19 01:15:48,231 INFO L226 Difference]: Without dead ends: 40 [2020-08-19 01:15:48,232 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 [2020-08-19 01:15:48,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-19 01:15:48,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-19 01:15:48,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-19 01:15:48,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-19 01:15:48,238 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-19 01:15:48,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:48,239 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-19 01:15:48,239 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-19 01:15:48,239 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-19 01:15:48,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-19 01:15:48,240 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:48,240 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] [2020-08-19 01:15:48,240 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-19 01:15:48,240 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:48,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:48,241 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-19 01:15:48,241 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:48,241 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [366589124] [2020-08-19 01:15:48,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:48,255 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:48,275 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:48,276 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:48,324 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:48,334 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:48,616 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:15:48,616 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [366589124] [2020-08-19 01:15:48,617 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:48,617 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-19 01:15:48,617 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1814473021] [2020-08-19 01:15:48,617 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-19 01:15:48,618 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:48,618 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-19 01:15:48,618 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-19 01:15:48,618 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-19 01:15:48,842 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:48,842 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-19 01:15:48,843 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-19 01:15:48,843 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-19 01:15:48,843 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:48,844 INFO L225 Difference]: With dead ends: 60 [2020-08-19 01:15:48,844 INFO L226 Difference]: Without dead ends: 42 [2020-08-19 01:15:48,846 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-19 01:15:48,847 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-19 01:15:48,855 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-19 01:15:48,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-19 01:15:48,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-19 01:15:48,857 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-19 01:15:48,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:48,858 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-19 01:15:48,858 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-19 01:15:48,858 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-19 01:15:48,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-19 01:15:48,862 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:48,862 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] [2020-08-19 01:15:48,863 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-19 01:15:48,863 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:48,863 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:48,863 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-19 01:15:48,864 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:48,866 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [371249047] [2020-08-19 01:15:48,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:48,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:48,911 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:48,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:48,950 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:48,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:49,254 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:15:49,255 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [371249047] [2020-08-19 01:15:49,255 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:49,255 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-19 01:15:49,255 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1655584605] [2020-08-19 01:15:49,256 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-19 01:15:49,256 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:49,256 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-19 01:15:49,257 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-19 01:15:49,257 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-19 01:15:49,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:49,461 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-19 01:15:49,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-19 01:15:49,462 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-19 01:15:49,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:49,463 INFO L225 Difference]: With dead ends: 62 [2020-08-19 01:15:49,463 INFO L226 Difference]: Without dead ends: 44 [2020-08-19 01:15:49,464 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 [2020-08-19 01:15:49,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-19 01:15:49,469 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-19 01:15:49,469 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-19 01:15:49,470 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-19 01:15:49,470 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-19 01:15:49,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:49,470 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-19 01:15:49,470 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-19 01:15:49,471 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-19 01:15:49,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-19 01:15:49,472 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:49,472 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] [2020-08-19 01:15:49,472 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-19 01:15:49,472 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:49,472 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:49,473 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-19 01:15:49,473 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:49,473 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [878571123] [2020-08-19 01:15:49,473 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:49,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:49,506 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:49,507 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:49,517 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:49,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:49,863 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-19 01:15:49,863 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [878571123] [2020-08-19 01:15:49,864 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:49,864 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-19 01:15:49,864 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510338400] [2020-08-19 01:15:49,865 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-19 01:15:49,865 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:49,865 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-19 01:15:49,866 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-19 01:15:49,866 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-19 01:15:50,124 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:50,124 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-19 01:15:50,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-19 01:15:50,125 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-19 01:15:50,125 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:50,125 INFO L225 Difference]: With dead ends: 64 [2020-08-19 01:15:50,126 INFO L226 Difference]: Without dead ends: 46 [2020-08-19 01:15:50,126 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 [2020-08-19 01:15:50,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-19 01:15:50,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-19 01:15:50,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-19 01:15:50,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-19 01:15:50,132 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-19 01:15:50,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:50,133 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-19 01:15:50,133 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-19 01:15:50,133 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-19 01:15:50,133 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-19 01:15:50,134 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:50,134 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] [2020-08-19 01:15:50,134 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-19 01:15:50,134 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:50,134 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:50,134 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-19 01:15:50,135 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:50,135 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [357013380] [2020-08-19 01:15:50,135 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:50,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:50,168 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:50,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:50,181 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:50,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:50,194 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-19 01:15:50,194 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [357013380] [2020-08-19 01:15:50,194 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:15:50,194 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 01:15:50,195 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1184088575] [2020-08-19 01:15:50,195 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 01:15:50,196 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:50,197 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 01:15:50,197 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 01:15:50,197 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-19 01:15:50,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:50,291 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-19 01:15:50,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 01:15:50,291 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-19 01:15:50,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:50,296 INFO L225 Difference]: With dead ends: 65 [2020-08-19 01:15:50,296 INFO L226 Difference]: Without dead ends: 53 [2020-08-19 01:15:50,297 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 [2020-08-19 01:15:50,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-19 01:15:50,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-19 01:15:50,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-19 01:15:50,313 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-19 01:15:50,314 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-19 01:15:50,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:50,314 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-19 01:15:50,314 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 01:15:50,314 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-19 01:15:50,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-19 01:15:50,315 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:50,315 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] [2020-08-19 01:15:50,316 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-19 01:15:50,316 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:50,316 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:50,316 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-19 01:15:50,316 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:50,317 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [737293976] [2020-08-19 01:15:50,317 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:50,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:50,356 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:50,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:50,369 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:50,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:50,382 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-19 01:15:50,382 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [737293976] [2020-08-19 01:15:50,383 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:50,383 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-19 01:15:50,383 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [134207264] [2020-08-19 01:15:50,383 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-19 01:15:50,384 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:50,384 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-19 01:15:50,384 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-19 01:15:50,384 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-19 01:15:50,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:50,485 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-19 01:15:50,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-19 01:15:50,486 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-19 01:15:50,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:50,487 INFO L225 Difference]: With dead ends: 73 [2020-08-19 01:15:50,487 INFO L226 Difference]: Without dead ends: 61 [2020-08-19 01:15:50,488 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 [2020-08-19 01:15:50,488 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-19 01:15:50,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-19 01:15:50,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 01:15:50,492 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-19 01:15:50,493 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-19 01:15:50,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:50,493 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-19 01:15:50,493 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-19 01:15:50,493 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-19 01:15:50,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 01:15:50,495 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:50,495 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] [2020-08-19 01:15:50,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-19 01:15:50,496 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:50,496 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:50,496 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-19 01:15:50,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:50,497 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [784083257] [2020-08-19 01:15:50,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:50,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:50,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:50,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:50,551 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:50,553 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:50,564 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-19 01:15:50,565 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [784083257] [2020-08-19 01:15:50,565 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-19 01:15:50,565 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-19 01:15:50,566 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1842241568] [2020-08-19 01:15:50,566 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-19 01:15:50,566 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:50,566 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-19 01:15:50,567 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-19 01:15:50,567 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-19 01:15:50,660 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:50,661 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-19 01:15:50,661 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-19 01:15:50,661 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-19 01:15:50,661 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:50,662 INFO L225 Difference]: With dead ends: 69 [2020-08-19 01:15:50,662 INFO L226 Difference]: Without dead ends: 49 [2020-08-19 01:15:50,663 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 [2020-08-19 01:15:50,663 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-19 01:15:50,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-19 01:15:50,668 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-19 01:15:50,668 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-19 01:15:50,669 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-19 01:15:50,669 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:50,669 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-19 01:15:50,669 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-19 01:15:50,669 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-19 01:15:50,670 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-19 01:15:50,670 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:50,671 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] [2020-08-19 01:15:50,671 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-19 01:15:50,671 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:50,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:50,672 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-19 01:15:50,672 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:50,673 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1808651798] [2020-08-19 01:15:50,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:50,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:50,712 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:50,712 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:50,725 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:50,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:51,145 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:15:51,146 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1808651798] [2020-08-19 01:15:51,146 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:51,147 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-19 01:15:51,147 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1569484965] [2020-08-19 01:15:51,147 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-19 01:15:51,147 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:51,148 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-19 01:15:51,148 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-19 01:15:51,148 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-19 01:15:51,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:51,385 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-19 01:15:51,386 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-19 01:15:51,386 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-19 01:15:51,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:51,387 INFO L225 Difference]: With dead ends: 74 [2020-08-19 01:15:51,387 INFO L226 Difference]: Without dead ends: 52 [2020-08-19 01:15:51,388 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 [2020-08-19 01:15:51,388 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-19 01:15:51,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-19 01:15:51,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-19 01:15:51,395 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-19 01:15:51,396 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-19 01:15:51,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:51,396 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-19 01:15:51,396 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-19 01:15:51,396 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-19 01:15:51,397 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-19 01:15:51,397 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:51,397 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] [2020-08-19 01:15:51,398 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-19 01:15:51,398 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:51,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:51,398 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-19 01:15:51,399 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:51,399 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1777024062] [2020-08-19 01:15:51,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:51,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:51,450 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:51,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:51,462 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:51,471 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:51,881 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:15:51,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1777024062] [2020-08-19 01:15:51,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:51,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-19 01:15:51,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406077911] [2020-08-19 01:15:51,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-19 01:15:51,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:51,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-19 01:15:51,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-19 01:15:51,884 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-19 01:15:52,084 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:52,085 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-19 01:15:52,085 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-19 01:15:52,085 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-19 01:15:52,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:52,086 INFO L225 Difference]: With dead ends: 76 [2020-08-19 01:15:52,086 INFO L226 Difference]: Without dead ends: 54 [2020-08-19 01:15:52,087 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 [2020-08-19 01:15:52,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-19 01:15:52,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-19 01:15:52,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-19 01:15:52,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-19 01:15:52,100 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-19 01:15:52,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:52,100 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-19 01:15:52,100 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-19 01:15:52,100 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-19 01:15:52,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-19 01:15:52,101 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:52,101 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] [2020-08-19 01:15:52,104 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-19 01:15:52,104 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:52,105 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:52,105 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-19 01:15:52,105 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:52,105 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1729771153] [2020-08-19 01:15:52,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:52,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:52,154 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:52,155 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:52,166 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:52,182 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:52,673 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:15:52,673 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1729771153] [2020-08-19 01:15:52,676 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:52,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-19 01:15:52,677 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523842814] [2020-08-19 01:15:52,677 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-19 01:15:52,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:52,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-19 01:15:52,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-19 01:15:52,679 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-19 01:15:52,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:52,911 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-19 01:15:52,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-19 01:15:52,911 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-19 01:15:52,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:52,912 INFO L225 Difference]: With dead ends: 78 [2020-08-19 01:15:52,912 INFO L226 Difference]: Without dead ends: 56 [2020-08-19 01:15:52,914 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 [2020-08-19 01:15:52,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-19 01:15:52,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-19 01:15:52,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-19 01:15:52,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-19 01:15:52,926 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-19 01:15:52,926 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:52,926 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-19 01:15:52,926 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-19 01:15:52,926 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-19 01:15:52,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-19 01:15:52,927 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:52,927 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] [2020-08-19 01:15:52,927 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-19 01:15:52,928 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:52,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:52,931 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-19 01:15:52,932 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:52,932 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1204085775] [2020-08-19 01:15:52,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:52,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:52,995 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:52,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:53,005 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:53,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:53,721 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:15:53,721 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1204085775] [2020-08-19 01:15:53,722 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:53,722 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-19 01:15:53,722 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [924457097] [2020-08-19 01:15:53,723 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-19 01:15:53,723 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:53,724 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-19 01:15:53,724 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-19 01:15:53,725 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-19 01:15:54,010 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:54,010 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-19 01:15:54,010 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-19 01:15:54,011 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-19 01:15:54,011 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:54,011 INFO L225 Difference]: With dead ends: 80 [2020-08-19 01:15:54,011 INFO L226 Difference]: Without dead ends: 58 [2020-08-19 01:15:54,012 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-19 01:15:54,013 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-19 01:15:54,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-19 01:15:54,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-19 01:15:54,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-19 01:15:54,019 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-19 01:15:54,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:54,020 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-19 01:15:54,020 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-19 01:15:54,020 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-19 01:15:54,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-19 01:15:54,021 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:54,021 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] [2020-08-19 01:15:54,021 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-19 01:15:54,021 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:54,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:54,022 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-19 01:15:54,022 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:54,022 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [442049203] [2020-08-19 01:15:54,022 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:54,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:54,077 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:54,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:54,088 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:54,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:54,631 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:15:54,631 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [442049203] [2020-08-19 01:15:54,631 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:54,631 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-19 01:15:54,632 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148497582] [2020-08-19 01:15:54,632 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-19 01:15:54,632 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:54,632 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-19 01:15:54,633 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-19 01:15:54,633 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-19 01:15:54,898 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:54,898 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-19 01:15:54,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-19 01:15:54,899 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-19 01:15:54,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:54,900 INFO L225 Difference]: With dead ends: 82 [2020-08-19 01:15:54,900 INFO L226 Difference]: Without dead ends: 60 [2020-08-19 01:15:54,901 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 [2020-08-19 01:15:54,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-19 01:15:54,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-19 01:15:54,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-19 01:15:54,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-19 01:15:54,906 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-19 01:15:54,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:54,907 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-19 01:15:54,907 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-19 01:15:54,907 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-19 01:15:54,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-19 01:15:54,907 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:54,908 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] [2020-08-19 01:15:54,908 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-19 01:15:54,908 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:54,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:54,908 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-19 01:15:54,909 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:54,909 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [408695942] [2020-08-19 01:15:54,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:54,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:54,951 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:54,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:54,963 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:54,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:55,569 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:15:55,570 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [408695942] [2020-08-19 01:15:55,570 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:55,570 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-19 01:15:55,570 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78692156] [2020-08-19 01:15:55,571 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-19 01:15:55,571 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:55,571 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-19 01:15:55,571 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-19 01:15:55,572 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-19 01:15:55,869 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:55,870 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-19 01:15:55,870 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-19 01:15:55,870 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-19 01:15:55,871 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:55,871 INFO L225 Difference]: With dead ends: 84 [2020-08-19 01:15:55,871 INFO L226 Difference]: Without dead ends: 62 [2020-08-19 01:15:55,872 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 [2020-08-19 01:15:55,873 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-19 01:15:55,876 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-19 01:15:55,876 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-19 01:15:55,879 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-19 01:15:55,879 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-19 01:15:55,879 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:55,880 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-19 01:15:55,880 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-19 01:15:55,880 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-19 01:15:55,880 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-19 01:15:55,881 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:55,881 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] [2020-08-19 01:15:55,881 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-19 01:15:55,881 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:55,881 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:55,882 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-19 01:15:55,882 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:55,882 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [521554254] [2020-08-19 01:15:55,882 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:55,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:55,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:55,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:55,955 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:55,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:56,707 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:15:56,707 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [521554254] [2020-08-19 01:15:56,707 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:56,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-19 01:15:56,708 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1806489045] [2020-08-19 01:15:56,708 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-19 01:15:56,708 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:56,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-19 01:15:56,709 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-19 01:15:56,709 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-19 01:15:56,942 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:56,943 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-19 01:15:56,943 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-19 01:15:56,943 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-19 01:15:56,944 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:56,944 INFO L225 Difference]: With dead ends: 86 [2020-08-19 01:15:56,945 INFO L226 Difference]: Without dead ends: 64 [2020-08-19 01:15:56,946 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 26 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=203, Invalid=349, Unknown=0, NotChecked=0, Total=552 [2020-08-19 01:15:56,947 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-19 01:15:56,951 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-19 01:15:56,951 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-19 01:15:56,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-19 01:15:56,952 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-19 01:15:56,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:56,952 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-19 01:15:56,952 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-19 01:15:56,952 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-19 01:15:56,953 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-19 01:15:56,953 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:56,953 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] [2020-08-19 01:15:56,953 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-19 01:15:56,954 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:56,954 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:56,954 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-19 01:15:56,954 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:56,954 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1940724636] [2020-08-19 01:15:56,955 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:56,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:56,996 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:56,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:57,006 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:57,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:57,707 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:15:57,708 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1940724636] [2020-08-19 01:15:57,708 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:57,708 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-19 01:15:57,709 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [402849586] [2020-08-19 01:15:57,709 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-19 01:15:57,709 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:57,709 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-19 01:15:57,710 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-19 01:15:57,710 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-19 01:15:58,037 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:58,038 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-19 01:15:58,038 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-19 01:15:58,038 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-19 01:15:58,039 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:58,040 INFO L225 Difference]: With dead ends: 88 [2020-08-19 01:15:58,040 INFO L226 Difference]: Without dead ends: 66 [2020-08-19 01:15:58,041 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 [2020-08-19 01:15:58,042 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-19 01:15:58,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-19 01:15:58,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-19 01:15:58,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-19 01:15:58,046 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-19 01:15:58,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:58,047 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-19 01:15:58,047 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-19 01:15:58,047 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-19 01:15:58,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-19 01:15:58,047 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:58,048 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] [2020-08-19 01:15:58,048 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-19 01:15:58,048 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:58,048 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:58,048 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-19 01:15:58,048 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:58,049 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2127893686] [2020-08-19 01:15:58,049 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:58,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:58,091 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:58,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:58,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:58,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:58,896 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:15:58,897 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2127893686] [2020-08-19 01:15:58,897 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:15:58,897 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-19 01:15:58,897 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884609791] [2020-08-19 01:15:58,898 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-19 01:15:58,898 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:15:58,898 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-19 01:15:58,898 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-19 01:15:58,898 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-19 01:15:59,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:15:59,225 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-19 01:15:59,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-19 01:15:59,231 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-19 01:15:59,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:15:59,232 INFO L225 Difference]: With dead ends: 90 [2020-08-19 01:15:59,232 INFO L226 Difference]: Without dead ends: 68 [2020-08-19 01:15:59,233 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 [2020-08-19 01:15:59,233 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-19 01:15:59,237 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-19 01:15:59,237 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-19 01:15:59,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-19 01:15:59,238 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-19 01:15:59,238 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:15:59,238 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-19 01:15:59,238 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-19 01:15:59,238 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-19 01:15:59,239 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-19 01:15:59,239 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:15:59,239 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] [2020-08-19 01:15:59,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-19 01:15:59,240 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:15:59,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:15:59,240 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-19 01:15:59,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:15:59,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [826033733] [2020-08-19 01:15:59,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:15:59,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:59,285 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:15:59,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:15:59,294 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:15:59,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:00,313 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:00,314 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [826033733] [2020-08-19 01:16:00,314 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:00,314 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-19 01:16:00,315 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1349581018] [2020-08-19 01:16:00,315 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-19 01:16:00,315 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:00,315 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-19 01:16:00,316 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-19 01:16:00,316 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-19 01:16:00,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:00,594 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-19 01:16:00,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-19 01:16:00,594 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-19 01:16:00,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:00,595 INFO L225 Difference]: With dead ends: 92 [2020-08-19 01:16:00,595 INFO L226 Difference]: Without dead ends: 70 [2020-08-19 01:16:00,596 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 [2020-08-19 01:16:00,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-19 01:16:00,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-19 01:16:00,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-19 01:16:00,602 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-19 01:16:00,602 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-19 01:16:00,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:00,602 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-19 01:16:00,602 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-19 01:16:00,603 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-19 01:16:00,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-19 01:16:00,603 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:00,603 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] [2020-08-19 01:16:00,604 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-19 01:16:00,604 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:00,604 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:00,604 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-19 01:16:00,604 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:00,604 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [325887879] [2020-08-19 01:16:00,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:00,622 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:00,648 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:00,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:00,659 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:00,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:01,562 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:01,563 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [325887879] [2020-08-19 01:16:01,563 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:01,563 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-19 01:16:01,563 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [875585803] [2020-08-19 01:16:01,564 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-19 01:16:01,564 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:01,564 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-19 01:16:01,564 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-19 01:16:01,564 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-19 01:16:01,895 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:01,895 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-19 01:16:01,895 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-19 01:16:01,896 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-19 01:16:01,896 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:01,897 INFO L225 Difference]: With dead ends: 94 [2020-08-19 01:16:01,897 INFO L226 Difference]: Without dead ends: 72 [2020-08-19 01:16:01,901 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-19 01:16:01,901 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-19 01:16:01,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-19 01:16:01,911 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-19 01:16:01,911 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-19 01:16:01,912 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-19 01:16:01,912 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:01,912 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-19 01:16:01,912 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-19 01:16:01,912 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-19 01:16:01,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-19 01:16:01,913 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:01,913 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] [2020-08-19 01:16:01,914 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-19 01:16:01,915 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:01,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:01,915 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-19 01:16:01,915 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:01,916 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [230405036] [2020-08-19 01:16:01,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:01,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:01,972 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:01,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:01,984 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:01,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:02,979 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:02,979 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [230405036] [2020-08-19 01:16:02,979 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:02,979 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-19 01:16:02,980 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1174109732] [2020-08-19 01:16:02,980 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-19 01:16:02,980 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:02,981 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-19 01:16:02,981 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-19 01:16:02,981 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-19 01:16:03,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:03,377 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-19 01:16:03,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-19 01:16:03,378 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-19 01:16:03,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:03,379 INFO L225 Difference]: With dead ends: 96 [2020-08-19 01:16:03,379 INFO L226 Difference]: Without dead ends: 74 [2020-08-19 01:16:03,380 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 [2020-08-19 01:16:03,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-19 01:16:03,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-19 01:16:03,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-19 01:16:03,385 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-19 01:16:03,385 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-19 01:16:03,385 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:03,385 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-19 01:16:03,385 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-19 01:16:03,386 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-19 01:16:03,386 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-19 01:16:03,386 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:03,386 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] [2020-08-19 01:16:03,386 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-19 01:16:03,387 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:03,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:03,387 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-19 01:16:03,387 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:03,387 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [19712045] [2020-08-19 01:16:03,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:03,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:03,432 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:03,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:03,444 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:03,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:04,577 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:04,577 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [19712045] [2020-08-19 01:16:04,577 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:04,577 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-19 01:16:04,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [295809237] [2020-08-19 01:16:04,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-19 01:16:04,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:04,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-19 01:16:04,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-19 01:16:04,580 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-19 01:16:04,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:04,823 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-19 01:16:04,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-19 01:16:04,824 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-19 01:16:04,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:04,824 INFO L225 Difference]: With dead ends: 98 [2020-08-19 01:16:04,825 INFO L226 Difference]: Without dead ends: 76 [2020-08-19 01:16:04,825 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-19 01:16:04,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-19 01:16:04,829 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-19 01:16:04,829 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-19 01:16:04,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-19 01:16:04,830 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-19 01:16:04,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:04,831 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-19 01:16:04,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-19 01:16:04,831 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-19 01:16:04,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-19 01:16:04,831 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:04,832 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] [2020-08-19 01:16:04,832 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-19 01:16:04,832 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:04,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:04,832 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-19 01:16:04,832 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:04,833 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [890192458] [2020-08-19 01:16:04,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:04,851 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:04,884 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:04,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:04,895 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:04,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:06,015 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:06,016 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [890192458] [2020-08-19 01:16:06,016 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:06,016 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-19 01:16:06,016 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [399589389] [2020-08-19 01:16:06,016 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-19 01:16:06,016 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:06,016 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-19 01:16:06,017 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-19 01:16:06,017 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-19 01:16:06,355 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:06,355 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-19 01:16:06,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-19 01:16:06,355 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-19 01:16:06,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:06,356 INFO L225 Difference]: With dead ends: 100 [2020-08-19 01:16:06,356 INFO L226 Difference]: Without dead ends: 78 [2020-08-19 01:16:06,357 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-19 01:16:06,358 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-19 01:16:06,364 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-19 01:16:06,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-19 01:16:06,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-19 01:16:06,365 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-19 01:16:06,366 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:06,367 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-19 01:16:06,367 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-19 01:16:06,367 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-19 01:16:06,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-19 01:16:06,367 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:06,368 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] [2020-08-19 01:16:06,368 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-19 01:16:06,368 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:06,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:06,368 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-19 01:16:06,369 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:06,369 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2007370284] [2020-08-19 01:16:06,369 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:06,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:06,420 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:06,421 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:06,430 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:06,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:07,585 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:07,585 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2007370284] [2020-08-19 01:16:07,585 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:07,585 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-19 01:16:07,586 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [28353043] [2020-08-19 01:16:07,586 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-19 01:16:07,586 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:07,586 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-19 01:16:07,587 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-19 01:16:07,587 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-19 01:16:07,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:07,986 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-19 01:16:07,986 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-19 01:16:07,986 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-19 01:16:07,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:07,987 INFO L225 Difference]: With dead ends: 102 [2020-08-19 01:16:07,988 INFO L226 Difference]: Without dead ends: 80 [2020-08-19 01:16:07,988 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 [2020-08-19 01:16:07,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-19 01:16:07,995 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-19 01:16:07,995 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-19 01:16:07,996 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-19 01:16:07,996 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-19 01:16:07,996 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:07,996 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-19 01:16:07,997 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-19 01:16:07,997 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-19 01:16:07,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-19 01:16:07,999 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:07,999 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] [2020-08-19 01:16:08,000 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-19 01:16:08,000 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:08,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:08,000 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-19 01:16:08,000 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:08,001 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [127148246] [2020-08-19 01:16:08,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:08,031 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:08,089 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:08,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:08,101 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:08,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:09,360 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:09,360 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [127148246] [2020-08-19 01:16:09,360 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:09,360 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-19 01:16:09,360 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1186914090] [2020-08-19 01:16:09,361 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-19 01:16:09,361 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:09,361 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-19 01:16:09,361 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-19 01:16:09,361 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-19 01:16:09,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:09,686 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-19 01:16:09,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-19 01:16:09,687 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-19 01:16:09,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:09,688 INFO L225 Difference]: With dead ends: 104 [2020-08-19 01:16:09,688 INFO L226 Difference]: Without dead ends: 82 [2020-08-19 01:16:09,689 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 [2020-08-19 01:16:09,690 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-19 01:16:09,693 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-19 01:16:09,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-19 01:16:09,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-19 01:16:09,694 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-19 01:16:09,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:09,694 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-19 01:16:09,694 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-19 01:16:09,694 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-19 01:16:09,695 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-19 01:16:09,695 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:09,695 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] [2020-08-19 01:16:09,695 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-19 01:16:09,696 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:09,696 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:09,696 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-19 01:16:09,696 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:09,696 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [367036785] [2020-08-19 01:16:09,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:09,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:09,766 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:09,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:09,776 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:09,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:11,118 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:11,119 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [367036785] [2020-08-19 01:16:11,119 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:11,119 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-19 01:16:11,119 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959990279] [2020-08-19 01:16:11,120 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-19 01:16:11,120 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:11,120 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-19 01:16:11,120 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-19 01:16:11,121 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-19 01:16:11,539 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:11,540 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-19 01:16:11,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-19 01:16:11,540 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-19 01:16:11,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:11,541 INFO L225 Difference]: With dead ends: 106 [2020-08-19 01:16:11,542 INFO L226 Difference]: Without dead ends: 84 [2020-08-19 01:16:11,543 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 01:16:11,544 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-19 01:16:11,547 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-19 01:16:11,547 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-19 01:16:11,548 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-19 01:16:11,548 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-19 01:16:11,548 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:11,548 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-19 01:16:11,548 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-19 01:16:11,548 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-19 01:16:11,549 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-19 01:16:11,549 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:11,549 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] [2020-08-19 01:16:11,549 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-19 01:16:11,550 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:11,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:11,550 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-19 01:16:11,550 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:11,551 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1330372027] [2020-08-19 01:16:11,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:11,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:11,608 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:11,609 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:11,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:11,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:13,019 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:13,020 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1330372027] [2020-08-19 01:16:13,020 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:13,020 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-19 01:16:13,020 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1925551005] [2020-08-19 01:16:13,020 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-19 01:16:13,020 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:13,021 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-19 01:16:13,021 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-19 01:16:13,021 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-19 01:16:13,472 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:13,472 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-19 01:16:13,472 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-19 01:16:13,473 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-19 01:16:13,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:13,474 INFO L225 Difference]: With dead ends: 108 [2020-08-19 01:16:13,474 INFO L226 Difference]: Without dead ends: 86 [2020-08-19 01:16:13,475 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 01:16:13,476 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-19 01:16:13,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-19 01:16:13,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-19 01:16:13,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-19 01:16:13,480 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-19 01:16:13,480 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:13,480 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-19 01:16:13,480 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-19 01:16:13,480 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-19 01:16:13,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-19 01:16:13,481 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:13,481 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] [2020-08-19 01:16:13,481 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-19 01:16:13,481 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:13,482 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:13,482 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-19 01:16:13,482 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:13,482 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1845530970] [2020-08-19 01:16:13,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:13,505 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:13,544 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:13,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:13,555 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:13,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:15,006 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:15,007 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1845530970] [2020-08-19 01:16:15,007 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:15,007 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-19 01:16:15,007 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [939394794] [2020-08-19 01:16:15,008 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-19 01:16:15,008 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:15,008 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-19 01:16:15,009 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-19 01:16:15,009 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-19 01:16:15,456 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:15,456 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-19 01:16:15,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-19 01:16:15,457 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-19 01:16:15,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:15,458 INFO L225 Difference]: With dead ends: 110 [2020-08-19 01:16:15,458 INFO L226 Difference]: Without dead ends: 88 [2020-08-19 01:16:15,460 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 [2020-08-19 01:16:15,461 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-19 01:16:15,464 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-19 01:16:15,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-19 01:16:15,465 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-19 01:16:15,465 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-19 01:16:15,465 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:15,465 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-19 01:16:15,466 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-19 01:16:15,466 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-19 01:16:15,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-19 01:16:15,466 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:15,466 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] [2020-08-19 01:16:15,467 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-19 01:16:15,467 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:15,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:15,467 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-19 01:16:15,467 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:15,467 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1866116670] [2020-08-19 01:16:15,468 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:15,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:15,518 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:15,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:15,535 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:15,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:17,113 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:17,114 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1866116670] [2020-08-19 01:16:17,114 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:17,114 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-19 01:16:17,114 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [441897150] [2020-08-19 01:16:17,114 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-19 01:16:17,115 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:17,115 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-19 01:16:17,115 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-19 01:16:17,116 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-19 01:16:17,553 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:17,554 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-19 01:16:17,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-19 01:16:17,554 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-19 01:16:17,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:17,555 INFO L225 Difference]: With dead ends: 112 [2020-08-19 01:16:17,555 INFO L226 Difference]: Without dead ends: 90 [2020-08-19 01:16:17,556 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 30 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=541, Invalid=791, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 01:16:17,557 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-19 01:16:17,562 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-19 01:16:17,562 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-19 01:16:17,562 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-19 01:16:17,563 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-19 01:16:17,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:17,564 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-19 01:16:17,564 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-19 01:16:17,564 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-19 01:16:17,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-19 01:16:17,565 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:17,565 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] [2020-08-19 01:16:17,565 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-19 01:16:17,565 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:17,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:17,566 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-19 01:16:17,566 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:17,566 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [564302681] [2020-08-19 01:16:17,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:17,588 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:17,617 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:17,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:17,641 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:17,659 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:19,320 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:19,320 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [564302681] [2020-08-19 01:16:19,321 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:19,321 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-19 01:16:19,321 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [519575996] [2020-08-19 01:16:19,321 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-19 01:16:19,321 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:19,321 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-19 01:16:19,322 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-19 01:16:19,322 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-19 01:16:19,823 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:19,823 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-19 01:16:19,823 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-19 01:16:19,824 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-19 01:16:19,824 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:19,825 INFO L225 Difference]: With dead ends: 114 [2020-08-19 01:16:19,825 INFO L226 Difference]: Without dead ends: 92 [2020-08-19 01:16:19,826 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=574, Invalid=832, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 01:16:19,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-19 01:16:19,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-19 01:16:19,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-19 01:16:19,831 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-19 01:16:19,831 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-19 01:16:19,831 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:19,831 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-19 01:16:19,831 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-19 01:16:19,831 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-19 01:16:19,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-19 01:16:19,832 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:19,832 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] [2020-08-19 01:16:19,833 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-19 01:16:19,833 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:19,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:19,833 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-19 01:16:19,833 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:19,836 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1536762486] [2020-08-19 01:16:19,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:19,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:19,896 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:19,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:19,908 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:19,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:21,659 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:21,660 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1536762486] [2020-08-19 01:16:21,660 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:21,660 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-19 01:16:21,660 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1909264637] [2020-08-19 01:16:21,660 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-19 01:16:21,661 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:21,661 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-19 01:16:21,661 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-19 01:16:21,662 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-19 01:16:22,027 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:22,027 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-19 01:16:22,028 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-19 01:16:22,028 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-19 01:16:22,028 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:22,029 INFO L225 Difference]: With dead ends: 116 [2020-08-19 01:16:22,029 INFO L226 Difference]: Without dead ends: 94 [2020-08-19 01:16:22,030 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 32 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=608, Invalid=874, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 01:16:22,030 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-19 01:16:22,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-19 01:16:22,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-19 01:16:22,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-19 01:16:22,035 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-19 01:16:22,035 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:22,035 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-19 01:16:22,035 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-19 01:16:22,035 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-19 01:16:22,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-19 01:16:22,036 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:22,036 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] [2020-08-19 01:16:22,036 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-19 01:16:22,036 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:22,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:22,037 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-19 01:16:22,037 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:22,037 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [864498942] [2020-08-19 01:16:22,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:22,059 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:22,095 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:22,096 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:22,105 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:22,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:23,923 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:23,924 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [864498942] [2020-08-19 01:16:23,924 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:23,924 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-19 01:16:23,924 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1200762507] [2020-08-19 01:16:23,924 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-19 01:16:23,924 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:23,925 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-19 01:16:23,925 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-19 01:16:23,925 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-19 01:16:24,434 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:24,434 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-19 01:16:24,435 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-19 01:16:24,435 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-19 01:16:24,435 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:24,436 INFO L225 Difference]: With dead ends: 118 [2020-08-19 01:16:24,436 INFO L226 Difference]: Without dead ends: 96 [2020-08-19 01:16:24,438 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=643, Invalid=917, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 01:16:24,438 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-19 01:16:24,441 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-19 01:16:24,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-19 01:16:24,442 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-19 01:16:24,442 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-19 01:16:24,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:24,443 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-19 01:16:24,443 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-19 01:16:24,443 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-19 01:16:24,443 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-19 01:16:24,444 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:24,444 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] [2020-08-19 01:16:24,444 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-19 01:16:24,444 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:24,444 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:24,444 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-19 01:16:24,445 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:24,445 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [892102219] [2020-08-19 01:16:24,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:24,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:24,510 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:24,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:24,521 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:24,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:26,561 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:26,562 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [892102219] [2020-08-19 01:16:26,562 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:26,562 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-19 01:16:26,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [885976260] [2020-08-19 01:16:26,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-19 01:16:26,563 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:26,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-19 01:16:26,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-19 01:16:26,564 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-19 01:16:26,994 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:26,994 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-19 01:16:26,995 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-19 01:16:26,995 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-19 01:16:26,996 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:26,996 INFO L225 Difference]: With dead ends: 120 [2020-08-19 01:16:26,996 INFO L226 Difference]: Without dead ends: 98 [2020-08-19 01:16:26,998 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 01:16:26,998 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-19 01:16:27,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-19 01:16:27,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-19 01:16:27,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-19 01:16:27,003 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-19 01:16:27,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:27,003 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-19 01:16:27,004 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-19 01:16:27,004 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-19 01:16:27,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-19 01:16:27,005 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:27,005 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] [2020-08-19 01:16:27,005 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-19 01:16:27,005 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:27,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:27,005 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-19 01:16:27,006 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:27,006 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [763019817] [2020-08-19 01:16:27,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:27,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:27,075 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:27,077 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:27,087 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:27,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:29,127 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:29,128 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [763019817] [2020-08-19 01:16:29,128 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:29,128 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-19 01:16:29,128 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1576586119] [2020-08-19 01:16:29,128 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-19 01:16:29,128 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:29,129 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-19 01:16:29,129 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-19 01:16:29,130 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-19 01:16:29,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:29,486 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-19 01:16:29,486 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-19 01:16:29,486 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-19 01:16:29,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:29,488 INFO L225 Difference]: With dead ends: 122 [2020-08-19 01:16:29,488 INFO L226 Difference]: Without dead ends: 100 [2020-08-19 01:16:29,489 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 35 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=716, Invalid=1006, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 01:16:29,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-19 01:16:29,492 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-19 01:16:29,493 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-19 01:16:29,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-19 01:16:29,493 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-19 01:16:29,494 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:29,494 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-19 01:16:29,494 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-19 01:16:29,494 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-19 01:16:29,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-19 01:16:29,495 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:29,495 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] [2020-08-19 01:16:29,495 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-19 01:16:29,495 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:29,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:29,496 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-19 01:16:29,496 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:29,496 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1415543999] [2020-08-19 01:16:29,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:29,522 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:29,565 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:29,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:29,574 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:29,593 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:31,794 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:31,795 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1415543999] [2020-08-19 01:16:31,795 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:31,795 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-19 01:16:31,795 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [357067632] [2020-08-19 01:16:31,795 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-19 01:16:31,795 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:31,796 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-19 01:16:31,796 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-19 01:16:31,796 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-19 01:16:32,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:32,144 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-19 01:16:32,145 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-19 01:16:32,145 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-19 01:16:32,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:32,146 INFO L225 Difference]: With dead ends: 124 [2020-08-19 01:16:32,146 INFO L226 Difference]: Without dead ends: 102 [2020-08-19 01:16:32,147 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 01:16:32,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-19 01:16:32,151 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-19 01:16:32,151 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-19 01:16:32,152 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-19 01:16:32,152 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-19 01:16:32,152 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:32,152 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-19 01:16:32,153 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-19 01:16:32,153 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-19 01:16:32,153 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-19 01:16:32,153 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:32,154 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] [2020-08-19 01:16:32,154 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-19 01:16:32,154 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:32,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:32,154 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-19 01:16:32,155 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:32,155 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [162928070] [2020-08-19 01:16:32,155 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:32,179 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:32,218 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:32,219 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:32,231 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:32,250 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:34,493 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:34,493 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [162928070] [2020-08-19 01:16:34,494 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:34,494 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-19 01:16:34,494 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998524631] [2020-08-19 01:16:34,494 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-19 01:16:34,494 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:34,494 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-19 01:16:34,495 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-19 01:16:34,495 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-19 01:16:34,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:34,852 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-19 01:16:34,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-19 01:16:34,853 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-19 01:16:34,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:34,854 INFO L225 Difference]: With dead ends: 126 [2020-08-19 01:16:34,854 INFO L226 Difference]: Without dead ends: 104 [2020-08-19 01:16:34,855 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-19 01:16:34,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-19 01:16:34,858 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-19 01:16:34,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-19 01:16:34,859 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-19 01:16:34,859 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-19 01:16:34,859 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:34,859 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-19 01:16:34,859 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-19 01:16:34,859 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-19 01:16:34,861 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-19 01:16:34,861 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:34,861 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] [2020-08-19 01:16:34,861 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-19 01:16:34,862 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:34,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:34,862 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-19 01:16:34,862 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:34,862 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2105945471] [2020-08-19 01:16:34,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:34,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:34,931 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:34,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:34,943 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:34,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:37,272 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:37,272 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2105945471] [2020-08-19 01:16:37,272 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:37,273 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-19 01:16:37,273 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [844643863] [2020-08-19 01:16:37,273 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-19 01:16:37,273 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:37,273 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-19 01:16:37,274 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-19 01:16:37,274 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-19 01:16:37,721 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:37,722 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-19 01:16:37,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-19 01:16:37,722 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-19 01:16:37,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:37,724 INFO L225 Difference]: With dead ends: 128 [2020-08-19 01:16:37,724 INFO L226 Difference]: Without dead ends: 106 [2020-08-19 01:16:37,726 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=833, Invalid=1147, Unknown=0, NotChecked=0, Total=1980 [2020-08-19 01:16:37,726 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-19 01:16:37,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-19 01:16:37,730 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-19 01:16:37,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-19 01:16:37,731 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-19 01:16:37,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:37,731 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-19 01:16:37,731 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-19 01:16:37,732 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-19 01:16:37,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-19 01:16:37,732 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:37,732 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] [2020-08-19 01:16:37,732 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-19 01:16:37,733 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:37,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:37,733 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-19 01:16:37,733 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:37,733 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [215104700] [2020-08-19 01:16:37,733 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:37,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:37,793 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:37,793 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:37,804 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:37,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:40,311 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-19 01:16:40,312 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [215104700] [2020-08-19 01:16:40,312 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-19 01:16:40,312 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-19 01:16:40,312 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427513966] [2020-08-19 01:16:40,313 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-19 01:16:40,313 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-19 01:16:40,313 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-19 01:16:40,314 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-19 01:16:40,314 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-19 01:16:40,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-19 01:16:40,921 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-19 01:16:40,922 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-19 01:16:40,922 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-19 01:16:40,923 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-19 01:16:40,923 INFO L225 Difference]: With dead ends: 130 [2020-08-19 01:16:40,924 INFO L226 Difference]: Without dead ends: 108 [2020-08-19 01:16:40,925 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-19 01:16:40,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-19 01:16:40,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-19 01:16:40,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-19 01:16:40,930 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-19 01:16:40,931 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-19 01:16:40,931 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-19 01:16:40,931 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-19 01:16:40,931 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-19 01:16:40,931 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-19 01:16:40,932 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-19 01:16:40,932 INFO L414 BasicCegarLoop]: Found error trace [2020-08-19 01:16:40,932 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] [2020-08-19 01:16:40,932 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-19 01:16:40,933 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-19 01:16:40,933 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-19 01:16:40,933 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-19 01:16:40,933 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-19 01:16:40,933 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1649635531] [2020-08-19 01:16:40,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-19 01:16:40,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,004 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-19 01:16:41,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-19 01:16:41,015 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-19 01:16:41,041 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat