/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=5000 --traceabstraction.additional.smt.options interpolation-heuristic=BIGGEST --traceabstraction.additional.smt.options log-additional-information=true -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i -------------------------------------------------------------------------------- This is Ultimate 0.1.25-177f698 [2020-08-21 17:27:00,417 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-08-21 17:27:00,420 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-08-21 17:27:00,448 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-08-21 17:27:00,449 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-08-21 17:27:00,453 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-08-21 17:27:00,454 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-08-21 17:27:00,456 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-08-21 17:27:00,458 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-08-21 17:27:00,459 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-08-21 17:27:00,460 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-08-21 17:27:00,461 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-08-21 17:27:00,461 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-08-21 17:27:00,462 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-08-21 17:27:00,463 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-08-21 17:27:00,464 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-08-21 17:27:00,465 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-08-21 17:27:00,466 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-08-21 17:27:00,468 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-08-21 17:27:00,469 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-08-21 17:27:00,471 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-08-21 17:27:00,472 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-08-21 17:27:00,473 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-08-21 17:27:00,474 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-08-21 17:27:00,484 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-08-21 17:27:00,494 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-08-21 17:27:00,495 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-08-21 17:27:00,497 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-08-21 17:27:00,498 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-08-21 17:27:00,548 INFO L113 SettingsManager]: Loading preferences was successful [2020-08-21 17:27:00,548 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-08-21 17:27:00,550 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-08-21 17:27:00,550 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-08-21 17:27:00,551 INFO L138 SettingsManager]: * Use SBE=true [2020-08-21 17:27:00,552 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-08-21 17:27:00,552 INFO L138 SettingsManager]: * sizeof long=4 [2020-08-21 17:27:00,553 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-08-21 17:27:00,553 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-08-21 17:27:00,553 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-08-21 17:27:00,553 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-08-21 17:27:00,553 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-08-21 17:27:00,555 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-08-21 17:27:00,555 INFO L138 SettingsManager]: * sizeof long double=12 [2020-08-21 17:27:00,555 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-08-21 17:27:00,555 INFO L138 SettingsManager]: * Use constant arrays=true [2020-08-21 17:27:00,555 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-08-21 17:27:00,556 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-08-21 17:27:00,556 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-08-21 17:27:00,556 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-08-21 17:27:00,556 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-08-21 17:27:00,556 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:27:00,557 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-08-21 17:27:00,558 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-08-21 17:27:00,558 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-08-21 17:27:00,558 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-08-21 17:27:00,558 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-08-21 17:27:00,558 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-08-21 17:27:00,558 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-08-21 17:27:00,559 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=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Additional SMT options -> enumeration-timeout=5000;interpolation-heuristic=BIGGEST;log-additional-information=true; [2020-08-21 17:27:00,884 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-08-21 17:27:00,897 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-08-21 17:27:00,900 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-08-21 17:27:00,902 INFO L271 PluginConnector]: Initializing CDTParser... [2020-08-21 17:27:00,902 INFO L275 PluginConnector]: CDTParser initialized [2020-08-21 17:27:00,903 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-21 17:27:00,979 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e3d35d9af/c903dba98c7c4e56ab69080e37757637/FLAG6d407db9f [2020-08-21 17:27:01,447 INFO L306 CDTParser]: Found 1 translation units. [2020-08-21 17:27:01,447 INFO L160 CDTParser]: Scanning /storage/repos/ultimate-2/trunk/examples/svcomp/array-lopstr16/flag_loopdep.i [2020-08-21 17:27:01,454 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e3d35d9af/c903dba98c7c4e56ab69080e37757637/FLAG6d407db9f [2020-08-21 17:27:01,878 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/data/e3d35d9af/c903dba98c7c4e56ab69080e37757637 [2020-08-21 17:27:01,887 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-08-21 17:27:01,888 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-08-21 17:27:01,889 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-08-21 17:27:01,890 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-08-21 17:27:01,893 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-08-21 17:27:01,894 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:27:01" (1/1) ... [2020-08-21 17:27:01,897 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@b86a7e8 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:01, skipping insertion in model container [2020-08-21 17:27:01,898 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.08 05:27:01" (1/1) ... [2020-08-21 17:27:01,906 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-08-21 17:27:01,929 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-08-21 17:27:02,125 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:27:02,132 INFO L203 MainTranslator]: Completed pre-run [2020-08-21 17:27:02,150 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-08-21 17:27:02,167 INFO L208 MainTranslator]: Completed translation [2020-08-21 17:27:02,167 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:02 WrapperNode [2020-08-21 17:27:02,168 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-08-21 17:27:02,168 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-08-21 17:27:02,169 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-08-21 17:27:02,169 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-08-21 17:27:02,273 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:02" (1/1) ... [2020-08-21 17:27:02,273 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:02" (1/1) ... [2020-08-21 17:27:02,284 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:02" (1/1) ... [2020-08-21 17:27:02,284 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:02" (1/1) ... [2020-08-21 17:27:02,293 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:02" (1/1) ... [2020-08-21 17:27:02,299 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:02" (1/1) ... [2020-08-21 17:27:02,300 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:02" (1/1) ... [2020-08-21 17:27:02,303 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-08-21 17:27:02,303 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-08-21 17:27:02,304 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-08-21 17:27:02,304 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-08-21 17:27:02,305 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:02" (1/1) ... No working directory specified, using /storage/repos/ultimate-2/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-08-21 17:27:02,370 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-08-21 17:27:02,370 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-08-21 17:27:02,371 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-08-21 17:27:02,371 INFO L138 BoogieDeclarations]: Found implementation of procedure init [2020-08-21 17:27:02,371 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-08-21 17:27:02,371 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-08-21 17:27:02,371 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-08-21 17:27:02,371 INFO L130 BoogieDeclarations]: Found specification of procedure malloc [2020-08-21 17:27:02,372 INFO L130 BoogieDeclarations]: Found specification of procedure nondet_pointer [2020-08-21 17:27:02,372 INFO L130 BoogieDeclarations]: Found specification of procedure init [2020-08-21 17:27:02,372 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2020-08-21 17:27:02,372 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2020-08-21 17:27:02,372 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-08-21 17:27:02,372 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-08-21 17:27:02,373 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2020-08-21 17:27:02,373 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-08-21 17:27:02,373 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-08-21 17:27:02,374 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-08-21 17:27:02,679 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-08-21 17:27:02,680 INFO L295 CfgBuilder]: Removed 3 assume(true) statements. [2020-08-21 17:27:02,684 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:27:02 BoogieIcfgContainer [2020-08-21 17:27:02,684 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-08-21 17:27:02,688 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-08-21 17:27:02,688 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-08-21 17:27:02,691 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-08-21 17:27:02,691 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.08 05:27:01" (1/3) ... [2020-08-21 17:27:02,692 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@460d20fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:27:02, skipping insertion in model container [2020-08-21 17:27:02,692 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.08 05:27:02" (2/3) ... [2020-08-21 17:27:02,693 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@460d20fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.08 05:27:02, skipping insertion in model container [2020-08-21 17:27:02,693 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.08 05:27:02" (3/3) ... [2020-08-21 17:27:02,695 INFO L109 eAbstractionObserver]: Analyzing ICFG flag_loopdep.i [2020-08-21 17:27:02,705 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-08-21 17:27:02,712 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-08-21 17:27:02,727 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-08-21 17:27:02,750 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-08-21 17:27:02,750 INFO L376 AbstractCegarLoop]: Hoare is true [2020-08-21 17:27:02,750 INFO L377 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-08-21 17:27:02,751 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-08-21 17:27:02,751 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-08-21 17:27:02,751 INFO L380 AbstractCegarLoop]: Difference is false [2020-08-21 17:27:02,751 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-08-21 17:27:02,751 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-08-21 17:27:02,769 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states. [2020-08-21 17:27:02,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 17:27:02,775 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:02,777 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] [2020-08-21 17:27:02,777 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:02,789 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:02,789 INFO L82 PathProgramCache]: Analyzing trace with hash 1059974619, now seen corresponding path program 1 times [2020-08-21 17:27:02,796 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:02,797 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1965110238] [2020-08-21 17:27:02,797 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:02,907 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:02,986 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:02,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,033 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:03,037 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,048 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:03,049 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1965110238] [2020-08-21 17:27:03,051 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:03,052 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2020-08-21 17:27:03,053 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482612679] [2020-08-21 17:27:03,059 INFO L459 AbstractCegarLoop]: Interpolant automaton has 4 states [2020-08-21 17:27:03,060 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:03,074 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2020-08-21 17:27:03,075 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2020-08-21 17:27:03,077 INFO L87 Difference]: Start difference. First operand 33 states. Second operand 4 states. [2020-08-21 17:27:03,248 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:03,248 INFO L93 Difference]: Finished difference Result 59 states and 76 transitions. [2020-08-21 17:27:03,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-08-21 17:27:03,251 INFO L78 Accepts]: Start accepts. Automaton has 4 states. Word has length 20 [2020-08-21 17:27:03,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:03,265 INFO L225 Difference]: With dead ends: 59 [2020-08-21 17:27:03,265 INFO L226 Difference]: Without dead ends: 31 [2020-08-21 17:27:03,270 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 [2020-08-21 17:27:03,292 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2020-08-21 17:27:03,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 28. [2020-08-21 17:27:03,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 28 states. [2020-08-21 17:27:03,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 32 transitions. [2020-08-21 17:27:03,322 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 32 transitions. Word has length 20 [2020-08-21 17:27:03,322 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:03,323 INFO L479 AbstractCegarLoop]: Abstraction has 28 states and 32 transitions. [2020-08-21 17:27:03,323 INFO L480 AbstractCegarLoop]: Interpolant automaton has 4 states. [2020-08-21 17:27:03,323 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 32 transitions. [2020-08-21 17:27:03,324 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-08-21 17:27:03,324 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:03,325 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] [2020-08-21 17:27:03,325 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-08-21 17:27:03,326 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:03,326 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:03,326 INFO L82 PathProgramCache]: Analyzing trace with hash -931069882, now seen corresponding path program 1 times [2020-08-21 17:27:03,327 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:03,327 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [932651261] [2020-08-21 17:27:03,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:03,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,400 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:03,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,422 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:03,430 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,508 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:03,509 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [932651261] [2020-08-21 17:27:03,509 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:03,509 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2020-08-21 17:27:03,510 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284334437] [2020-08-21 17:27:03,511 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 17:27:03,512 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:03,512 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 17:27:03,513 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:27:03,513 INFO L87 Difference]: Start difference. First operand 28 states and 32 transitions. Second operand 6 states. [2020-08-21 17:27:03,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:03,743 INFO L93 Difference]: Finished difference Result 48 states and 56 transitions. [2020-08-21 17:27:03,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2020-08-21 17:27:03,744 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 20 [2020-08-21 17:27:03,744 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:03,745 INFO L225 Difference]: With dead ends: 48 [2020-08-21 17:27:03,746 INFO L226 Difference]: Without dead ends: 30 [2020-08-21 17:27:03,747 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 [2020-08-21 17:27:03,748 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2020-08-21 17:27:03,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 29. [2020-08-21 17:27:03,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 29 states. [2020-08-21 17:27:03,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2020-08-21 17:27:03,763 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 20 [2020-08-21 17:27:03,763 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:03,765 INFO L479 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2020-08-21 17:27:03,765 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 17:27:03,765 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2020-08-21 17:27:03,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2020-08-21 17:27:03,768 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:03,768 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] [2020-08-21 17:27:03,768 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-08-21 17:27:03,769 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:03,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:03,773 INFO L82 PathProgramCache]: Analyzing trace with hash 1782065480, now seen corresponding path program 1 times [2020-08-21 17:27:03,773 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:03,774 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [418384779] [2020-08-21 17:27:03,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:03,848 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,900 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:03,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:03,925 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:03,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:04,053 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:04,053 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [418384779] [2020-08-21 17:27:04,054 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:04,054 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7] total 7 [2020-08-21 17:27:04,054 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2092062506] [2020-08-21 17:27:04,055 INFO L459 AbstractCegarLoop]: Interpolant automaton has 7 states [2020-08-21 17:27:04,055 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:04,055 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2020-08-21 17:27:04,056 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2020-08-21 17:27:04,056 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand 7 states. [2020-08-21 17:27:04,225 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:04,226 INFO L93 Difference]: Finished difference Result 50 states and 58 transitions. [2020-08-21 17:27:04,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-08-21 17:27:04,226 INFO L78 Accepts]: Start accepts. Automaton has 7 states. Word has length 22 [2020-08-21 17:27:04,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:04,228 INFO L225 Difference]: With dead ends: 50 [2020-08-21 17:27:04,228 INFO L226 Difference]: Without dead ends: 32 [2020-08-21 17:27:04,229 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 [2020-08-21 17:27:04,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2020-08-21 17:27:04,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 31. [2020-08-21 17:27:04,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 31 states. [2020-08-21 17:27:04,236 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2020-08-21 17:27:04,236 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 22 [2020-08-21 17:27:04,237 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:04,237 INFO L479 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2020-08-21 17:27:04,237 INFO L480 AbstractCegarLoop]: Interpolant automaton has 7 states. [2020-08-21 17:27:04,237 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2020-08-21 17:27:04,238 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2020-08-21 17:27:04,238 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:04,238 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] [2020-08-21 17:27:04,239 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2020-08-21 17:27:04,239 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:04,239 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:04,239 INFO L82 PathProgramCache]: Analyzing trace with hash 2059999690, now seen corresponding path program 2 times [2020-08-21 17:27:04,240 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:04,240 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [490770240] [2020-08-21 17:27:04,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:04,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:04,284 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:04,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:04,299 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:04,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:04,451 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:04,452 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [490770240] [2020-08-21 17:27:04,452 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:04,452 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8] total 8 [2020-08-21 17:27:04,452 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1583663685] [2020-08-21 17:27:04,454 INFO L459 AbstractCegarLoop]: Interpolant automaton has 8 states [2020-08-21 17:27:04,454 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:04,454 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2020-08-21 17:27:04,454 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2020-08-21 17:27:04,455 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand 8 states. [2020-08-21 17:27:04,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:04,653 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2020-08-21 17:27:04,654 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2020-08-21 17:27:04,654 INFO L78 Accepts]: Start accepts. Automaton has 8 states. Word has length 24 [2020-08-21 17:27:04,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:04,655 INFO L225 Difference]: With dead ends: 52 [2020-08-21 17:27:04,655 INFO L226 Difference]: Without dead ends: 34 [2020-08-21 17:27:04,656 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 [2020-08-21 17:27:04,656 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2020-08-21 17:27:04,661 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2020-08-21 17:27:04,662 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-08-21 17:27:04,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 37 transitions. [2020-08-21 17:27:04,663 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 37 transitions. Word has length 24 [2020-08-21 17:27:04,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:04,663 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 37 transitions. [2020-08-21 17:27:04,663 INFO L480 AbstractCegarLoop]: Interpolant automaton has 8 states. [2020-08-21 17:27:04,663 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 37 transitions. [2020-08-21 17:27:04,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2020-08-21 17:27:04,664 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:04,665 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] [2020-08-21 17:27:04,665 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2020-08-21 17:27:04,665 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:04,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:04,665 INFO L82 PathProgramCache]: Analyzing trace with hash -1428164148, now seen corresponding path program 3 times [2020-08-21 17:27:04,666 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:04,666 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [839190815] [2020-08-21 17:27:04,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:04,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:04,704 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:04,705 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:04,724 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:04,732 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:04,885 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:04,885 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [839190815] [2020-08-21 17:27:04,885 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:04,886 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9] total 9 [2020-08-21 17:27:04,886 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [12979625] [2020-08-21 17:27:04,887 INFO L459 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-08-21 17:27:04,887 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:04,887 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-08-21 17:27:04,888 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=51, Unknown=0, NotChecked=0, Total=72 [2020-08-21 17:27:04,888 INFO L87 Difference]: Start difference. First operand 33 states and 37 transitions. Second operand 9 states. [2020-08-21 17:27:05,076 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:05,076 INFO L93 Difference]: Finished difference Result 54 states and 62 transitions. [2020-08-21 17:27:05,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2020-08-21 17:27:05,077 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 26 [2020-08-21 17:27:05,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:05,078 INFO L225 Difference]: With dead ends: 54 [2020-08-21 17:27:05,078 INFO L226 Difference]: Without dead ends: 36 [2020-08-21 17:27:05,079 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 [2020-08-21 17:27:05,079 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2020-08-21 17:27:05,083 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 35. [2020-08-21 17:27:05,083 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 35 states. [2020-08-21 17:27:05,084 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 39 transitions. [2020-08-21 17:27:05,085 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 39 transitions. Word has length 26 [2020-08-21 17:27:05,085 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:05,085 INFO L479 AbstractCegarLoop]: Abstraction has 35 states and 39 transitions. [2020-08-21 17:27:05,085 INFO L480 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-08-21 17:27:05,085 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 39 transitions. [2020-08-21 17:27:05,086 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2020-08-21 17:27:05,086 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:05,087 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] [2020-08-21 17:27:05,087 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2020-08-21 17:27:05,087 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:05,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:05,088 INFO L82 PathProgramCache]: Analyzing trace with hash 815845710, now seen corresponding path program 4 times [2020-08-21 17:27:05,088 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:05,088 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [636865809] [2020-08-21 17:27:05,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:05,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:05,119 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:05,121 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:05,132 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:05,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:05,312 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:05,313 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [636865809] [2020-08-21 17:27:05,313 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:05,313 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10] total 10 [2020-08-21 17:27:05,313 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1369161758] [2020-08-21 17:27:05,314 INFO L459 AbstractCegarLoop]: Interpolant automaton has 10 states [2020-08-21 17:27:05,314 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:05,314 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2020-08-21 17:27:05,315 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2020-08-21 17:27:05,315 INFO L87 Difference]: Start difference. First operand 35 states and 39 transitions. Second operand 10 states. [2020-08-21 17:27:05,475 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:05,476 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2020-08-21 17:27:05,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2020-08-21 17:27:05,476 INFO L78 Accepts]: Start accepts. Automaton has 10 states. Word has length 28 [2020-08-21 17:27:05,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:05,477 INFO L225 Difference]: With dead ends: 56 [2020-08-21 17:27:05,478 INFO L226 Difference]: Without dead ends: 38 [2020-08-21 17:27:05,478 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 [2020-08-21 17:27:05,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2020-08-21 17:27:05,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 37. [2020-08-21 17:27:05,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 37 states. [2020-08-21 17:27:05,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 41 transitions. [2020-08-21 17:27:05,484 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 41 transitions. Word has length 28 [2020-08-21 17:27:05,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:05,485 INFO L479 AbstractCegarLoop]: Abstraction has 37 states and 41 transitions. [2020-08-21 17:27:05,485 INFO L480 AbstractCegarLoop]: Interpolant automaton has 10 states. [2020-08-21 17:27:05,485 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 41 transitions. [2020-08-21 17:27:05,486 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2020-08-21 17:27:05,486 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:05,486 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] [2020-08-21 17:27:05,486 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2020-08-21 17:27:05,487 INFO L427 AbstractCegarLoop]: === Iteration 7 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:05,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:05,487 INFO L82 PathProgramCache]: Analyzing trace with hash 1235736656, now seen corresponding path program 5 times [2020-08-21 17:27:05,487 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:05,487 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [694734929] [2020-08-21 17:27:05,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:05,500 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:05,522 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:05,524 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:05,536 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:05,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:05,754 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:05,754 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [694734929] [2020-08-21 17:27:05,754 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:05,755 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11] total 11 [2020-08-21 17:27:05,755 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [820757719] [2020-08-21 17:27:05,755 INFO L459 AbstractCegarLoop]: Interpolant automaton has 11 states [2020-08-21 17:27:05,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:05,756 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2020-08-21 17:27:05,756 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=76, Unknown=0, NotChecked=0, Total=110 [2020-08-21 17:27:05,756 INFO L87 Difference]: Start difference. First operand 37 states and 41 transitions. Second operand 11 states. [2020-08-21 17:27:05,952 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:05,953 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2020-08-21 17:27:05,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-08-21 17:27:05,954 INFO L78 Accepts]: Start accepts. Automaton has 11 states. Word has length 30 [2020-08-21 17:27:05,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:05,955 INFO L225 Difference]: With dead ends: 58 [2020-08-21 17:27:05,955 INFO L226 Difference]: Without dead ends: 40 [2020-08-21 17:27:05,956 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 [2020-08-21 17:27:05,957 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2020-08-21 17:27:05,964 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 39. [2020-08-21 17:27:05,964 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-08-21 17:27:05,966 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 43 transitions. [2020-08-21 17:27:05,966 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 43 transitions. Word has length 30 [2020-08-21 17:27:05,968 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:05,968 INFO L479 AbstractCegarLoop]: Abstraction has 39 states and 43 transitions. [2020-08-21 17:27:05,969 INFO L480 AbstractCegarLoop]: Interpolant automaton has 11 states. [2020-08-21 17:27:05,969 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 43 transitions. [2020-08-21 17:27:05,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-08-21 17:27:05,973 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:05,973 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] [2020-08-21 17:27:05,973 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2020-08-21 17:27:05,974 INFO L427 AbstractCegarLoop]: === Iteration 8 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:05,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:05,974 INFO L82 PathProgramCache]: Analyzing trace with hash 1024009938, now seen corresponding path program 6 times [2020-08-21 17:27:05,974 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:05,975 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [856304620] [2020-08-21 17:27:05,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:06,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:06,037 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:06,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:06,048 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:06,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:06,297 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:06,297 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [856304620] [2020-08-21 17:27:06,297 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:06,298 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12] total 12 [2020-08-21 17:27:06,298 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137758761] [2020-08-21 17:27:06,298 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-08-21 17:27:06,298 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:06,299 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-08-21 17:27:06,299 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=90, Unknown=0, NotChecked=0, Total=132 [2020-08-21 17:27:06,300 INFO L87 Difference]: Start difference. First operand 39 states and 43 transitions. Second operand 12 states. [2020-08-21 17:27:06,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:06,544 INFO L93 Difference]: Finished difference Result 60 states and 68 transitions. [2020-08-21 17:27:06,547 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2020-08-21 17:27:06,547 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 32 [2020-08-21 17:27:06,547 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:06,548 INFO L225 Difference]: With dead ends: 60 [2020-08-21 17:27:06,548 INFO L226 Difference]: Without dead ends: 42 [2020-08-21 17:27:06,551 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=68, Invalid=142, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:27:06,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2020-08-21 17:27:06,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 41. [2020-08-21 17:27:06,559 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 41 states. [2020-08-21 17:27:06,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2020-08-21 17:27:06,560 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 32 [2020-08-21 17:27:06,560 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:06,560 INFO L479 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2020-08-21 17:27:06,560 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-08-21 17:27:06,560 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2020-08-21 17:27:06,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2020-08-21 17:27:06,561 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:06,561 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] [2020-08-21 17:27:06,562 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2020-08-21 17:27:06,562 INFO L427 AbstractCegarLoop]: === Iteration 9 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:06,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:06,562 INFO L82 PathProgramCache]: Analyzing trace with hash -581903148, now seen corresponding path program 7 times [2020-08-21 17:27:06,563 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:06,563 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [906626930] [2020-08-21 17:27:06,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:06,575 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:06,594 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:06,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:06,605 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:06,611 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:06,900 INFO L134 CoverageAnalysis]: Checked inductivity of 49 backedges. 0 proven. 49 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:06,901 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [906626930] [2020-08-21 17:27:06,901 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:06,901 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13] total 13 [2020-08-21 17:27:06,902 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852947211] [2020-08-21 17:27:06,902 INFO L459 AbstractCegarLoop]: Interpolant automaton has 13 states [2020-08-21 17:27:06,902 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:06,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2020-08-21 17:27:06,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=51, Invalid=105, Unknown=0, NotChecked=0, Total=156 [2020-08-21 17:27:06,908 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand 13 states. [2020-08-21 17:27:07,092 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:07,093 INFO L93 Difference]: Finished difference Result 62 states and 70 transitions. [2020-08-21 17:27:07,093 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-08-21 17:27:07,093 INFO L78 Accepts]: Start accepts. Automaton has 13 states. Word has length 34 [2020-08-21 17:27:07,093 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:07,094 INFO L225 Difference]: With dead ends: 62 [2020-08-21 17:27:07,094 INFO L226 Difference]: Without dead ends: 44 [2020-08-21 17:27:07,095 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 [2020-08-21 17:27:07,096 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2020-08-21 17:27:07,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 43. [2020-08-21 17:27:07,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 43 states. [2020-08-21 17:27:07,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2020-08-21 17:27:07,106 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 34 [2020-08-21 17:27:07,106 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:07,106 INFO L479 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2020-08-21 17:27:07,107 INFO L480 AbstractCegarLoop]: Interpolant automaton has 13 states. [2020-08-21 17:27:07,107 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2020-08-21 17:27:07,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2020-08-21 17:27:07,110 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:07,111 INFO L422 BasicCegarLoop]: trace histogram [8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:27:07,111 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2020-08-21 17:27:07,111 INFO L427 AbstractCegarLoop]: === Iteration 10 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:07,111 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:07,112 INFO L82 PathProgramCache]: Analyzing trace with hash -1971119530, now seen corresponding path program 8 times [2020-08-21 17:27:07,112 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:07,112 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [758926376] [2020-08-21 17:27:07,112 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:07,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:07,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,186 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:07,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,538 INFO L134 CoverageAnalysis]: Checked inductivity of 64 backedges. 0 proven. 64 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-08-21 17:27:07,538 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [758926376] [2020-08-21 17:27:07,538 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:07,539 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14] total 14 [2020-08-21 17:27:07,539 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007142591] [2020-08-21 17:27:07,539 INFO L459 AbstractCegarLoop]: Interpolant automaton has 14 states [2020-08-21 17:27:07,540 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:07,540 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2020-08-21 17:27:07,540 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=121, Unknown=0, NotChecked=0, Total=182 [2020-08-21 17:27:07,540 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand 14 states. [2020-08-21 17:27:07,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:07,794 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2020-08-21 17:27:07,794 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2020-08-21 17:27:07,795 INFO L78 Accepts]: Start accepts. Automaton has 14 states. Word has length 36 [2020-08-21 17:27:07,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:07,796 INFO L225 Difference]: With dead ends: 64 [2020-08-21 17:27:07,796 INFO L226 Difference]: Without dead ends: 46 [2020-08-21 17:27:07,797 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 [2020-08-21 17:27:07,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2020-08-21 17:27:07,814 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2020-08-21 17:27:07,814 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 45 states. [2020-08-21 17:27:07,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 49 transitions. [2020-08-21 17:27:07,815 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 49 transitions. Word has length 36 [2020-08-21 17:27:07,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:07,815 INFO L479 AbstractCegarLoop]: Abstraction has 45 states and 49 transitions. [2020-08-21 17:27:07,815 INFO L480 AbstractCegarLoop]: Interpolant automaton has 14 states. [2020-08-21 17:27:07,815 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 49 transitions. [2020-08-21 17:27:07,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 39 [2020-08-21 17:27:07,817 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:07,817 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] [2020-08-21 17:27:07,817 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2020-08-21 17:27:07,817 INFO L427 AbstractCegarLoop]: === Iteration 11 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:07,818 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:07,818 INFO L82 PathProgramCache]: Analyzing trace with hash -1273233576, now seen corresponding path program 9 times [2020-08-21 17:27:07,818 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:07,818 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [186426135] [2020-08-21 17:27:07,818 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:07,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,851 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:07,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,862 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:07,864 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:07,874 INFO L134 CoverageAnalysis]: Checked inductivity of 81 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 17:27:07,875 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [186426135] [2020-08-21 17:27:07,875 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:07,875 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 17:27:07,875 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [746203464] [2020-08-21 17:27:07,876 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:27:07,876 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:07,876 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:27:07,876 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:07,877 INFO L87 Difference]: Start difference. First operand 45 states and 49 transitions. Second operand 5 states. [2020-08-21 17:27:07,960 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:07,961 INFO L93 Difference]: Finished difference Result 65 states and 74 transitions. [2020-08-21 17:27:07,961 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 17:27:07,961 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 38 [2020-08-21 17:27:07,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:07,964 INFO L225 Difference]: With dead ends: 65 [2020-08-21 17:27:07,964 INFO L226 Difference]: Without dead ends: 53 [2020-08-21 17:27:07,965 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 [2020-08-21 17:27:07,965 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2020-08-21 17:27:07,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 46. [2020-08-21 17:27:07,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 46 states. [2020-08-21 17:27:07,975 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 50 transitions. [2020-08-21 17:27:07,975 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 50 transitions. Word has length 38 [2020-08-21 17:27:07,975 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:07,975 INFO L479 AbstractCegarLoop]: Abstraction has 46 states and 50 transitions. [2020-08-21 17:27:07,975 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:27:07,975 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 50 transitions. [2020-08-21 17:27:07,976 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2020-08-21 17:27:07,976 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:07,976 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] [2020-08-21 17:27:07,976 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2020-08-21 17:27:07,977 INFO L427 AbstractCegarLoop]: === Iteration 12 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:07,977 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:07,977 INFO L82 PathProgramCache]: Analyzing trace with hash -1053921041, now seen corresponding path program 1 times [2020-08-21 17:27:07,977 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:07,980 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [169570274] [2020-08-21 17:27:07,980 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:08,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,053 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:08,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,065 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:08,067 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,083 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2020-08-21 17:27:08,084 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [169570274] [2020-08-21 17:27:08,084 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:08,084 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6] total 6 [2020-08-21 17:27:08,084 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [318442540] [2020-08-21 17:27:08,085 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-08-21 17:27:08,086 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:08,086 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-08-21 17:27:08,087 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2020-08-21 17:27:08,087 INFO L87 Difference]: Start difference. First operand 46 states and 50 transitions. Second operand 6 states. [2020-08-21 17:27:08,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:08,184 INFO L93 Difference]: Finished difference Result 73 states and 85 transitions. [2020-08-21 17:27:08,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2020-08-21 17:27:08,185 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 41 [2020-08-21 17:27:08,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:08,186 INFO L225 Difference]: With dead ends: 73 [2020-08-21 17:27:08,186 INFO L226 Difference]: Without dead ends: 61 [2020-08-21 17:27:08,187 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 [2020-08-21 17:27:08,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2020-08-21 17:27:08,195 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 49. [2020-08-21 17:27:08,195 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 17:27:08,196 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 54 transitions. [2020-08-21 17:27:08,197 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 54 transitions. Word has length 41 [2020-08-21 17:27:08,197 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:08,197 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 54 transitions. [2020-08-21 17:27:08,197 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-08-21 17:27:08,197 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 54 transitions. [2020-08-21 17:27:08,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 17:27:08,201 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:08,201 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] [2020-08-21 17:27:08,201 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2020-08-21 17:27:08,202 INFO L427 AbstractCegarLoop]: === Iteration 13 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:08,202 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:08,202 INFO L82 PathProgramCache]: Analyzing trace with hash -159448072, now seen corresponding path program 2 times [2020-08-21 17:27:08,202 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:08,203 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [98212267] [2020-08-21 17:27:08,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:08,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,257 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:08,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,269 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:08,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,284 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 83 trivial. 0 not checked. [2020-08-21 17:27:08,284 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [98212267] [2020-08-21 17:27:08,284 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-08-21 17:27:08,284 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2020-08-21 17:27:08,285 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1356505401] [2020-08-21 17:27:08,286 INFO L459 AbstractCegarLoop]: Interpolant automaton has 5 states [2020-08-21 17:27:08,286 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:08,287 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2020-08-21 17:27:08,287 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2020-08-21 17:27:08,287 INFO L87 Difference]: Start difference. First operand 49 states and 54 transitions. Second operand 5 states. [2020-08-21 17:27:08,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:08,351 INFO L93 Difference]: Finished difference Result 69 states and 78 transitions. [2020-08-21 17:27:08,351 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2020-08-21 17:27:08,352 INFO L78 Accepts]: Start accepts. Automaton has 5 states. Word has length 44 [2020-08-21 17:27:08,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:08,355 INFO L225 Difference]: With dead ends: 69 [2020-08-21 17:27:08,355 INFO L226 Difference]: Without dead ends: 49 [2020-08-21 17:27:08,356 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 [2020-08-21 17:27:08,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2020-08-21 17:27:08,365 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2020-08-21 17:27:08,365 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 49 states. [2020-08-21 17:27:08,365 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 52 transitions. [2020-08-21 17:27:08,369 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 52 transitions. Word has length 44 [2020-08-21 17:27:08,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:08,369 INFO L479 AbstractCegarLoop]: Abstraction has 49 states and 52 transitions. [2020-08-21 17:27:08,370 INFO L480 AbstractCegarLoop]: Interpolant automaton has 5 states. [2020-08-21 17:27:08,370 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 52 transitions. [2020-08-21 17:27:08,370 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2020-08-21 17:27:08,370 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:08,371 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] [2020-08-21 17:27:08,371 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2020-08-21 17:27:08,371 INFO L427 AbstractCegarLoop]: === Iteration 14 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:08,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:08,371 INFO L82 PathProgramCache]: Analyzing trace with hash -1139281096, now seen corresponding path program 1 times [2020-08-21 17:27:08,372 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:08,372 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1858111892] [2020-08-21 17:27:08,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:08,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,440 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:08,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,451 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:08,462 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:08,881 INFO L134 CoverageAnalysis]: Checked inductivity of 86 backedges. 0 proven. 81 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:08,881 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1858111892] [2020-08-21 17:27:08,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:08,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15] total 15 [2020-08-21 17:27:08,882 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1093315942] [2020-08-21 17:27:08,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 15 states [2020-08-21 17:27:08,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:08,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2020-08-21 17:27:08,883 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=138, Unknown=0, NotChecked=0, Total=210 [2020-08-21 17:27:08,883 INFO L87 Difference]: Start difference. First operand 49 states and 52 transitions. Second operand 15 states. [2020-08-21 17:27:09,088 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:09,088 INFO L93 Difference]: Finished difference Result 74 states and 80 transitions. [2020-08-21 17:27:09,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2020-08-21 17:27:09,089 INFO L78 Accepts]: Start accepts. Automaton has 15 states. Word has length 44 [2020-08-21 17:27:09,089 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:09,090 INFO L225 Difference]: With dead ends: 74 [2020-08-21 17:27:09,090 INFO L226 Difference]: Without dead ends: 52 [2020-08-21 17:27:09,092 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 [2020-08-21 17:27:09,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2020-08-21 17:27:09,096 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 51. [2020-08-21 17:27:09,097 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 51 states. [2020-08-21 17:27:09,097 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 54 transitions. [2020-08-21 17:27:09,098 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 54 transitions. Word has length 44 [2020-08-21 17:27:09,098 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:09,098 INFO L479 AbstractCegarLoop]: Abstraction has 51 states and 54 transitions. [2020-08-21 17:27:09,098 INFO L480 AbstractCegarLoop]: Interpolant automaton has 15 states. [2020-08-21 17:27:09,098 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 54 transitions. [2020-08-21 17:27:09,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2020-08-21 17:27:09,099 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:09,099 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] [2020-08-21 17:27:09,099 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2020-08-21 17:27:09,100 INFO L427 AbstractCegarLoop]: === Iteration 15 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:09,100 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:09,100 INFO L82 PathProgramCache]: Analyzing trace with hash 763672122, now seen corresponding path program 2 times [2020-08-21 17:27:09,100 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:09,100 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1181215762] [2020-08-21 17:27:09,101 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:09,114 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:09,147 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:09,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:09,158 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:09,166 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:09,577 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:09,578 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1181215762] [2020-08-21 17:27:09,578 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:09,578 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16] total 16 [2020-08-21 17:27:09,578 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249296564] [2020-08-21 17:27:09,579 INFO L459 AbstractCegarLoop]: Interpolant automaton has 16 states [2020-08-21 17:27:09,579 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:09,579 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2020-08-21 17:27:09,579 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=84, Invalid=156, Unknown=0, NotChecked=0, Total=240 [2020-08-21 17:27:09,579 INFO L87 Difference]: Start difference. First operand 51 states and 54 transitions. Second operand 16 states. [2020-08-21 17:27:09,838 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:09,838 INFO L93 Difference]: Finished difference Result 76 states and 82 transitions. [2020-08-21 17:27:09,839 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2020-08-21 17:27:09,839 INFO L78 Accepts]: Start accepts. Automaton has 16 states. Word has length 46 [2020-08-21 17:27:09,839 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:09,840 INFO L225 Difference]: With dead ends: 76 [2020-08-21 17:27:09,840 INFO L226 Difference]: Without dead ends: 54 [2020-08-21 17:27:09,840 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 [2020-08-21 17:27:09,841 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2020-08-21 17:27:09,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 53. [2020-08-21 17:27:09,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 53 states. [2020-08-21 17:27:09,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 56 transitions. [2020-08-21 17:27:09,846 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 56 transitions. Word has length 46 [2020-08-21 17:27:09,846 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:09,846 INFO L479 AbstractCegarLoop]: Abstraction has 53 states and 56 transitions. [2020-08-21 17:27:09,847 INFO L480 AbstractCegarLoop]: Interpolant automaton has 16 states. [2020-08-21 17:27:09,847 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 56 transitions. [2020-08-21 17:27:09,847 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2020-08-21 17:27:09,847 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:09,848 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] [2020-08-21 17:27:09,848 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2020-08-21 17:27:09,848 INFO L427 AbstractCegarLoop]: === Iteration 16 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:09,848 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:09,848 INFO L82 PathProgramCache]: Analyzing trace with hash -154353476, now seen corresponding path program 3 times [2020-08-21 17:27:09,849 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:09,849 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1610878617] [2020-08-21 17:27:09,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:09,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:09,888 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:09,889 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:09,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:09,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:10,528 INFO L134 CoverageAnalysis]: Checked inductivity of 126 backedges. 0 proven. 121 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:10,529 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1610878617] [2020-08-21 17:27:10,531 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:10,532 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17] total 17 [2020-08-21 17:27:10,532 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1729346888] [2020-08-21 17:27:10,533 INFO L459 AbstractCegarLoop]: Interpolant automaton has 17 states [2020-08-21 17:27:10,533 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:10,534 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2020-08-21 17:27:10,534 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=175, Unknown=0, NotChecked=0, Total=272 [2020-08-21 17:27:10,534 INFO L87 Difference]: Start difference. First operand 53 states and 56 transitions. Second operand 17 states. [2020-08-21 17:27:10,831 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:10,831 INFO L93 Difference]: Finished difference Result 78 states and 84 transitions. [2020-08-21 17:27:10,831 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2020-08-21 17:27:10,832 INFO L78 Accepts]: Start accepts. Automaton has 17 states. Word has length 48 [2020-08-21 17:27:10,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:10,832 INFO L225 Difference]: With dead ends: 78 [2020-08-21 17:27:10,833 INFO L226 Difference]: Without dead ends: 56 [2020-08-21 17:27:10,835 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=133, Invalid=247, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:27:10,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2020-08-21 17:27:10,843 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 55. [2020-08-21 17:27:10,844 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 55 states. [2020-08-21 17:27:10,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 58 transitions. [2020-08-21 17:27:10,845 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 58 transitions. Word has length 48 [2020-08-21 17:27:10,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:10,846 INFO L479 AbstractCegarLoop]: Abstraction has 55 states and 58 transitions. [2020-08-21 17:27:10,846 INFO L480 AbstractCegarLoop]: Interpolant automaton has 17 states. [2020-08-21 17:27:10,846 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 58 transitions. [2020-08-21 17:27:10,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2020-08-21 17:27:10,846 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:10,847 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] [2020-08-21 17:27:10,851 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2020-08-21 17:27:10,851 INFO L427 AbstractCegarLoop]: === Iteration 17 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:10,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:10,851 INFO L82 PathProgramCache]: Analyzing trace with hash -1908657474, now seen corresponding path program 4 times [2020-08-21 17:27:10,852 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:10,852 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [873091069] [2020-08-21 17:27:10,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:10,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:10,903 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:10,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:10,917 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:10,928 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:11,439 INFO L134 CoverageAnalysis]: Checked inductivity of 149 backedges. 0 proven. 144 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:11,440 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [873091069] [2020-08-21 17:27:11,441 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:11,441 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18] total 18 [2020-08-21 17:27:11,441 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1898284278] [2020-08-21 17:27:11,442 INFO L459 AbstractCegarLoop]: Interpolant automaton has 18 states [2020-08-21 17:27:11,442 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:11,442 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2020-08-21 17:27:11,442 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=111, Invalid=195, Unknown=0, NotChecked=0, Total=306 [2020-08-21 17:27:11,442 INFO L87 Difference]: Start difference. First operand 55 states and 58 transitions. Second operand 18 states. [2020-08-21 17:27:11,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:11,686 INFO L93 Difference]: Finished difference Result 80 states and 86 transitions. [2020-08-21 17:27:11,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2020-08-21 17:27:11,686 INFO L78 Accepts]: Start accepts. Automaton has 18 states. Word has length 50 [2020-08-21 17:27:11,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:11,688 INFO L225 Difference]: With dead ends: 80 [2020-08-21 17:27:11,688 INFO L226 Difference]: Without dead ends: 58 [2020-08-21 17:27:11,689 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=149, Invalid=271, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:27:11,689 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2020-08-21 17:27:11,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2020-08-21 17:27:11,694 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-08-21 17:27:11,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 60 transitions. [2020-08-21 17:27:11,695 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 60 transitions. Word has length 50 [2020-08-21 17:27:11,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:11,695 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 60 transitions. [2020-08-21 17:27:11,695 INFO L480 AbstractCegarLoop]: Interpolant automaton has 18 states. [2020-08-21 17:27:11,695 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 60 transitions. [2020-08-21 17:27:11,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2020-08-21 17:27:11,696 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:11,696 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] [2020-08-21 17:27:11,696 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2020-08-21 17:27:11,696 INFO L427 AbstractCegarLoop]: === Iteration 18 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:11,697 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:11,697 INFO L82 PathProgramCache]: Analyzing trace with hash 127347776, now seen corresponding path program 5 times [2020-08-21 17:27:11,697 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:11,697 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [455686365] [2020-08-21 17:27:11,697 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:11,711 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:11,737 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:11,738 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:11,749 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:11,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:12,323 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 0 proven. 169 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:12,323 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [455686365] [2020-08-21 17:27:12,323 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:12,324 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19] total 19 [2020-08-21 17:27:12,324 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1708352270] [2020-08-21 17:27:12,328 INFO L459 AbstractCegarLoop]: Interpolant automaton has 19 states [2020-08-21 17:27:12,328 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:12,329 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2020-08-21 17:27:12,334 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=126, Invalid=216, Unknown=0, NotChecked=0, Total=342 [2020-08-21 17:27:12,335 INFO L87 Difference]: Start difference. First operand 57 states and 60 transitions. Second operand 19 states. [2020-08-21 17:27:12,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:12,590 INFO L93 Difference]: Finished difference Result 82 states and 88 transitions. [2020-08-21 17:27:12,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2020-08-21 17:27:12,590 INFO L78 Accepts]: Start accepts. Automaton has 19 states. Word has length 52 [2020-08-21 17:27:12,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:12,591 INFO L225 Difference]: With dead ends: 82 [2020-08-21 17:27:12,591 INFO L226 Difference]: Without dead ends: 60 [2020-08-21 17:27:12,592 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=166, Invalid=296, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:27:12,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2020-08-21 17:27:12,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 59. [2020-08-21 17:27:12,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 59 states. [2020-08-21 17:27:12,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 62 transitions. [2020-08-21 17:27:12,598 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 62 transitions. Word has length 52 [2020-08-21 17:27:12,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:12,598 INFO L479 AbstractCegarLoop]: Abstraction has 59 states and 62 transitions. [2020-08-21 17:27:12,598 INFO L480 AbstractCegarLoop]: Interpolant automaton has 19 states. [2020-08-21 17:27:12,599 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 62 transitions. [2020-08-21 17:27:12,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2020-08-21 17:27:12,599 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:12,599 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] [2020-08-21 17:27:12,600 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2020-08-21 17:27:12,600 INFO L427 AbstractCegarLoop]: === Iteration 19 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:12,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:12,600 INFO L82 PathProgramCache]: Analyzing trace with hash -1776693950, now seen corresponding path program 6 times [2020-08-21 17:27:12,600 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:12,601 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1252277394] [2020-08-21 17:27:12,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:12,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:12,643 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:12,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:12,654 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:12,664 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:13,276 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:13,276 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1252277394] [2020-08-21 17:27:13,276 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:13,277 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20] total 20 [2020-08-21 17:27:13,277 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1572835606] [2020-08-21 17:27:13,277 INFO L459 AbstractCegarLoop]: Interpolant automaton has 20 states [2020-08-21 17:27:13,277 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:13,278 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2020-08-21 17:27:13,278 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=142, Invalid=238, Unknown=0, NotChecked=0, Total=380 [2020-08-21 17:27:13,278 INFO L87 Difference]: Start difference. First operand 59 states and 62 transitions. Second operand 20 states. [2020-08-21 17:27:13,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:13,548 INFO L93 Difference]: Finished difference Result 84 states and 90 transitions. [2020-08-21 17:27:13,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2020-08-21 17:27:13,552 INFO L78 Accepts]: Start accepts. Automaton has 20 states. Word has length 54 [2020-08-21 17:27:13,553 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:13,553 INFO L225 Difference]: With dead ends: 84 [2020-08-21 17:27:13,554 INFO L226 Difference]: Without dead ends: 62 [2020-08-21 17:27:13,554 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 [2020-08-21 17:27:13,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2020-08-21 17:27:13,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2020-08-21 17:27:13,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 61 states. [2020-08-21 17:27:13,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 64 transitions. [2020-08-21 17:27:13,559 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 64 transitions. Word has length 54 [2020-08-21 17:27:13,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:13,559 INFO L479 AbstractCegarLoop]: Abstraction has 61 states and 64 transitions. [2020-08-21 17:27:13,559 INFO L480 AbstractCegarLoop]: Interpolant automaton has 20 states. [2020-08-21 17:27:13,559 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 64 transitions. [2020-08-21 17:27:13,560 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-08-21 17:27:13,560 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:13,560 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] [2020-08-21 17:27:13,560 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2020-08-21 17:27:13,561 INFO L427 AbstractCegarLoop]: === Iteration 20 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:13,561 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:13,561 INFO L82 PathProgramCache]: Analyzing trace with hash -1904724540, now seen corresponding path program 7 times [2020-08-21 17:27:13,561 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:13,561 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [886893976] [2020-08-21 17:27:13,562 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:13,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:13,620 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:13,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:13,629 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:13,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:14,333 INFO L134 CoverageAnalysis]: Checked inductivity of 230 backedges. 0 proven. 225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:14,333 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [886893976] [2020-08-21 17:27:14,333 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:14,334 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21] total 21 [2020-08-21 17:27:14,334 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1902072631] [2020-08-21 17:27:14,334 INFO L459 AbstractCegarLoop]: Interpolant automaton has 21 states [2020-08-21 17:27:14,334 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:14,335 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2020-08-21 17:27:14,335 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=261, Unknown=0, NotChecked=0, Total=420 [2020-08-21 17:27:14,335 INFO L87 Difference]: Start difference. First operand 61 states and 64 transitions. Second operand 21 states. [2020-08-21 17:27:14,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:14,554 INFO L93 Difference]: Finished difference Result 86 states and 92 transitions. [2020-08-21 17:27:14,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2020-08-21 17:27:14,554 INFO L78 Accepts]: Start accepts. Automaton has 21 states. Word has length 56 [2020-08-21 17:27:14,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:14,555 INFO L225 Difference]: With dead ends: 86 [2020-08-21 17:27:14,556 INFO L226 Difference]: Without dead ends: 64 [2020-08-21 17:27:14,557 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 [2020-08-21 17:27:14,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2020-08-21 17:27:14,563 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 63. [2020-08-21 17:27:14,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 63 states. [2020-08-21 17:27:14,564 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 66 transitions. [2020-08-21 17:27:14,565 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 66 transitions. Word has length 56 [2020-08-21 17:27:14,566 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:14,566 INFO L479 AbstractCegarLoop]: Abstraction has 63 states and 66 transitions. [2020-08-21 17:27:14,566 INFO L480 AbstractCegarLoop]: Interpolant automaton has 21 states. [2020-08-21 17:27:14,566 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 66 transitions. [2020-08-21 17:27:14,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2020-08-21 17:27:14,567 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:14,568 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] [2020-08-21 17:27:14,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2020-08-21 17:27:14,568 INFO L427 AbstractCegarLoop]: === Iteration 21 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:14,568 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:14,568 INFO L82 PathProgramCache]: Analyzing trace with hash -388069946, now seen corresponding path program 8 times [2020-08-21 17:27:14,569 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:14,569 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [99297400] [2020-08-21 17:27:14,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:14,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:14,626 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:14,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:14,636 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:14,646 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:15,375 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 0 proven. 256 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:15,376 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [99297400] [2020-08-21 17:27:15,376 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:15,376 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22] total 22 [2020-08-21 17:27:15,376 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [883194823] [2020-08-21 17:27:15,379 INFO L459 AbstractCegarLoop]: Interpolant automaton has 22 states [2020-08-21 17:27:15,379 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:15,379 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2020-08-21 17:27:15,380 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=285, Unknown=0, NotChecked=0, Total=462 [2020-08-21 17:27:15,380 INFO L87 Difference]: Start difference. First operand 63 states and 66 transitions. Second operand 22 states. [2020-08-21 17:27:15,699 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:15,700 INFO L93 Difference]: Finished difference Result 88 states and 94 transitions. [2020-08-21 17:27:15,701 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2020-08-21 17:27:15,701 INFO L78 Accepts]: Start accepts. Automaton has 22 states. Word has length 58 [2020-08-21 17:27:15,701 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:15,702 INFO L225 Difference]: With dead ends: 88 [2020-08-21 17:27:15,702 INFO L226 Difference]: Without dead ends: 66 [2020-08-21 17:27:15,704 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 [2020-08-21 17:27:15,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2020-08-21 17:27:15,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2020-08-21 17:27:15,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 65 states. [2020-08-21 17:27:15,709 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 68 transitions. [2020-08-21 17:27:15,709 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 68 transitions. Word has length 58 [2020-08-21 17:27:15,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:15,709 INFO L479 AbstractCegarLoop]: Abstraction has 65 states and 68 transitions. [2020-08-21 17:27:15,709 INFO L480 AbstractCegarLoop]: Interpolant automaton has 22 states. [2020-08-21 17:27:15,709 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 68 transitions. [2020-08-21 17:27:15,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2020-08-21 17:27:15,710 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:15,710 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] [2020-08-21 17:27:15,710 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2020-08-21 17:27:15,710 INFO L427 AbstractCegarLoop]: === Iteration 22 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:15,711 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:15,711 INFO L82 PathProgramCache]: Analyzing trace with hash 1123081544, now seen corresponding path program 9 times [2020-08-21 17:27:15,711 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:15,711 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [834375285] [2020-08-21 17:27:15,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:15,727 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:15,753 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:15,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:15,762 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:15,773 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:16,561 INFO L134 CoverageAnalysis]: Checked inductivity of 294 backedges. 0 proven. 289 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:16,561 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [834375285] [2020-08-21 17:27:16,561 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:16,561 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23] total 23 [2020-08-21 17:27:16,562 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253702357] [2020-08-21 17:27:16,562 INFO L459 AbstractCegarLoop]: Interpolant automaton has 23 states [2020-08-21 17:27:16,562 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:16,563 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2020-08-21 17:27:16,563 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=196, Invalid=310, Unknown=0, NotChecked=0, Total=506 [2020-08-21 17:27:16,563 INFO L87 Difference]: Start difference. First operand 65 states and 68 transitions. Second operand 23 states. [2020-08-21 17:27:16,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:16,877 INFO L93 Difference]: Finished difference Result 90 states and 96 transitions. [2020-08-21 17:27:16,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2020-08-21 17:27:16,880 INFO L78 Accepts]: Start accepts. Automaton has 23 states. Word has length 60 [2020-08-21 17:27:16,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:16,881 INFO L225 Difference]: With dead ends: 90 [2020-08-21 17:27:16,881 INFO L226 Difference]: Without dead ends: 68 [2020-08-21 17:27:16,881 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 [2020-08-21 17:27:16,882 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2020-08-21 17:27:16,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 67. [2020-08-21 17:27:16,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 67 states. [2020-08-21 17:27:16,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 70 transitions. [2020-08-21 17:27:16,886 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 70 transitions. Word has length 60 [2020-08-21 17:27:16,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:16,886 INFO L479 AbstractCegarLoop]: Abstraction has 67 states and 70 transitions. [2020-08-21 17:27:16,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 23 states. [2020-08-21 17:27:16,886 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 70 transitions. [2020-08-21 17:27:16,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2020-08-21 17:27:16,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:16,887 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] [2020-08-21 17:27:16,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2020-08-21 17:27:16,887 INFO L427 AbstractCegarLoop]: === Iteration 23 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:16,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:16,888 INFO L82 PathProgramCache]: Analyzing trace with hash 1640717386, now seen corresponding path program 10 times [2020-08-21 17:27:16,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:16,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [612880687] [2020-08-21 17:27:16,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:16,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:16,926 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:16,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:16,948 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:16,964 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:17,785 INFO L134 CoverageAnalysis]: Checked inductivity of 329 backedges. 0 proven. 324 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:17,785 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [612880687] [2020-08-21 17:27:17,786 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:17,786 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24] total 24 [2020-08-21 17:27:17,786 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1525561339] [2020-08-21 17:27:17,786 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-08-21 17:27:17,787 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:17,787 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-08-21 17:27:17,787 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=336, Unknown=0, NotChecked=0, Total=552 [2020-08-21 17:27:17,787 INFO L87 Difference]: Start difference. First operand 67 states and 70 transitions. Second operand 24 states. [2020-08-21 17:27:18,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:18,065 INFO L93 Difference]: Finished difference Result 92 states and 98 transitions. [2020-08-21 17:27:18,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2020-08-21 17:27:18,065 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 62 [2020-08-21 17:27:18,066 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:18,066 INFO L225 Difference]: With dead ends: 92 [2020-08-21 17:27:18,066 INFO L226 Difference]: Without dead ends: 70 [2020-08-21 17:27:18,067 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=266, Invalid=436, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:27:18,067 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2020-08-21 17:27:18,075 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 69. [2020-08-21 17:27:18,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 69 states. [2020-08-21 17:27:18,075 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 72 transitions. [2020-08-21 17:27:18,076 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 72 transitions. Word has length 62 [2020-08-21 17:27:18,076 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:18,076 INFO L479 AbstractCegarLoop]: Abstraction has 69 states and 72 transitions. [2020-08-21 17:27:18,076 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-08-21 17:27:18,076 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 72 transitions. [2020-08-21 17:27:18,076 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 65 [2020-08-21 17:27:18,077 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:18,077 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] [2020-08-21 17:27:18,077 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2020-08-21 17:27:18,077 INFO L427 AbstractCegarLoop]: === Iteration 24 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:18,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:18,077 INFO L82 PathProgramCache]: Analyzing trace with hash 872555212, now seen corresponding path program 11 times [2020-08-21 17:27:18,077 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:18,078 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [321486742] [2020-08-21 17:27:18,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:18,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:18,130 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:18,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:18,145 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:18,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:19,233 INFO L134 CoverageAnalysis]: Checked inductivity of 366 backedges. 0 proven. 361 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:19,233 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [321486742] [2020-08-21 17:27:19,234 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:19,234 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25] total 25 [2020-08-21 17:27:19,234 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1260711473] [2020-08-21 17:27:19,234 INFO L459 AbstractCegarLoop]: Interpolant automaton has 25 states [2020-08-21 17:27:19,234 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:19,235 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2020-08-21 17:27:19,235 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=237, Invalid=363, Unknown=0, NotChecked=0, Total=600 [2020-08-21 17:27:19,235 INFO L87 Difference]: Start difference. First operand 69 states and 72 transitions. Second operand 25 states. [2020-08-21 17:27:19,567 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:19,568 INFO L93 Difference]: Finished difference Result 94 states and 100 transitions. [2020-08-21 17:27:19,568 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-08-21 17:27:19,568 INFO L78 Accepts]: Start accepts. Automaton has 25 states. Word has length 64 [2020-08-21 17:27:19,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:19,569 INFO L225 Difference]: With dead ends: 94 [2020-08-21 17:27:19,570 INFO L226 Difference]: Without dead ends: 72 [2020-08-21 17:27:19,570 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=289, Invalid=467, Unknown=0, NotChecked=0, Total=756 [2020-08-21 17:27:19,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2020-08-21 17:27:19,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 71. [2020-08-21 17:27:19,575 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 71 states. [2020-08-21 17:27:19,575 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 74 transitions. [2020-08-21 17:27:19,576 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 74 transitions. Word has length 64 [2020-08-21 17:27:19,576 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:19,576 INFO L479 AbstractCegarLoop]: Abstraction has 71 states and 74 transitions. [2020-08-21 17:27:19,576 INFO L480 AbstractCegarLoop]: Interpolant automaton has 25 states. [2020-08-21 17:27:19,576 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 74 transitions. [2020-08-21 17:27:19,577 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2020-08-21 17:27:19,577 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:19,577 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] [2020-08-21 17:27:19,577 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2020-08-21 17:27:19,577 INFO L427 AbstractCegarLoop]: === Iteration 25 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:19,577 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:19,578 INFO L82 PathProgramCache]: Analyzing trace with hash 1403080910, now seen corresponding path program 12 times [2020-08-21 17:27:19,578 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:19,578 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1450584862] [2020-08-21 17:27:19,578 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:19,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:19,627 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:19,627 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:19,637 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:19,649 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:20,599 INFO L134 CoverageAnalysis]: Checked inductivity of 405 backedges. 0 proven. 400 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:20,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1450584862] [2020-08-21 17:27:20,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:20,599 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26] total 26 [2020-08-21 17:27:20,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [41843745] [2020-08-21 17:27:20,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 26 states [2020-08-21 17:27:20,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:20,600 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2020-08-21 17:27:20,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=259, Invalid=391, Unknown=0, NotChecked=0, Total=650 [2020-08-21 17:27:20,601 INFO L87 Difference]: Start difference. First operand 71 states and 74 transitions. Second operand 26 states. [2020-08-21 17:27:20,949 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:20,950 INFO L93 Difference]: Finished difference Result 96 states and 102 transitions. [2020-08-21 17:27:20,950 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2020-08-21 17:27:20,950 INFO L78 Accepts]: Start accepts. Automaton has 26 states. Word has length 66 [2020-08-21 17:27:20,950 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:20,951 INFO L225 Difference]: With dead ends: 96 [2020-08-21 17:27:20,951 INFO L226 Difference]: Without dead ends: 74 [2020-08-21 17:27:20,952 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 [2020-08-21 17:27:20,952 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2020-08-21 17:27:20,955 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 73. [2020-08-21 17:27:20,956 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 73 states. [2020-08-21 17:27:20,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 76 transitions. [2020-08-21 17:27:20,956 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 76 transitions. Word has length 66 [2020-08-21 17:27:20,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:20,957 INFO L479 AbstractCegarLoop]: Abstraction has 73 states and 76 transitions. [2020-08-21 17:27:20,957 INFO L480 AbstractCegarLoop]: Interpolant automaton has 26 states. [2020-08-21 17:27:20,957 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 76 transitions. [2020-08-21 17:27:20,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2020-08-21 17:27:20,957 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:20,958 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] [2020-08-21 17:27:20,958 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24 [2020-08-21 17:27:20,958 INFO L427 AbstractCegarLoop]: === Iteration 26 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:20,958 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:20,958 INFO L82 PathProgramCache]: Analyzing trace with hash 137168464, now seen corresponding path program 13 times [2020-08-21 17:27:20,959 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:20,959 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1622749886] [2020-08-21 17:27:20,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:20,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:21,002 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:21,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:21,024 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:21,038 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:22,022 INFO L134 CoverageAnalysis]: Checked inductivity of 446 backedges. 0 proven. 441 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:22,023 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1622749886] [2020-08-21 17:27:22,023 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:22,023 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27] total 27 [2020-08-21 17:27:22,023 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329198908] [2020-08-21 17:27:22,024 INFO L459 AbstractCegarLoop]: Interpolant automaton has 27 states [2020-08-21 17:27:22,024 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:22,026 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2020-08-21 17:27:22,027 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=282, Invalid=420, Unknown=0, NotChecked=0, Total=702 [2020-08-21 17:27:22,027 INFO L87 Difference]: Start difference. First operand 73 states and 76 transitions. Second operand 27 states. [2020-08-21 17:27:22,249 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:22,249 INFO L93 Difference]: Finished difference Result 98 states and 104 transitions. [2020-08-21 17:27:22,249 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2020-08-21 17:27:22,250 INFO L78 Accepts]: Start accepts. Automaton has 27 states. Word has length 68 [2020-08-21 17:27:22,250 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:22,250 INFO L225 Difference]: With dead ends: 98 [2020-08-21 17:27:22,251 INFO L226 Difference]: Without dead ends: 76 [2020-08-21 17:27:22,251 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=338, Invalid=532, Unknown=0, NotChecked=0, Total=870 [2020-08-21 17:27:22,252 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2020-08-21 17:27:22,255 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 75. [2020-08-21 17:27:22,255 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 75 states. [2020-08-21 17:27:22,256 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 78 transitions. [2020-08-21 17:27:22,256 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 78 transitions. Word has length 68 [2020-08-21 17:27:22,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:22,256 INFO L479 AbstractCegarLoop]: Abstraction has 75 states and 78 transitions. [2020-08-21 17:27:22,256 INFO L480 AbstractCegarLoop]: Interpolant automaton has 27 states. [2020-08-21 17:27:22,256 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 78 transitions. [2020-08-21 17:27:22,257 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2020-08-21 17:27:22,257 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:22,257 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] [2020-08-21 17:27:22,257 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25 [2020-08-21 17:27:22,257 INFO L427 AbstractCegarLoop]: === Iteration 27 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:22,257 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:22,257 INFO L82 PathProgramCache]: Analyzing trace with hash -928947374, now seen corresponding path program 14 times [2020-08-21 17:27:22,257 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:22,258 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [927432174] [2020-08-21 17:27:22,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:22,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:22,302 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:22,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:22,312 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:22,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:23,361 INFO L134 CoverageAnalysis]: Checked inductivity of 489 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:23,362 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [927432174] [2020-08-21 17:27:23,362 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:23,362 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28] total 28 [2020-08-21 17:27:23,362 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2050038841] [2020-08-21 17:27:23,362 INFO L459 AbstractCegarLoop]: Interpolant automaton has 28 states [2020-08-21 17:27:23,363 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:23,363 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2020-08-21 17:27:23,363 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=450, Unknown=0, NotChecked=0, Total=756 [2020-08-21 17:27:23,363 INFO L87 Difference]: Start difference. First operand 75 states and 78 transitions. Second operand 28 states. [2020-08-21 17:27:23,695 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:23,696 INFO L93 Difference]: Finished difference Result 100 states and 106 transitions. [2020-08-21 17:27:23,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2020-08-21 17:27:23,708 INFO L78 Accepts]: Start accepts. Automaton has 28 states. Word has length 70 [2020-08-21 17:27:23,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:23,709 INFO L225 Difference]: With dead ends: 100 [2020-08-21 17:27:23,709 INFO L226 Difference]: Without dead ends: 78 [2020-08-21 17:27:23,710 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2020-08-21 17:27:23,710 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2020-08-21 17:27:23,715 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 77. [2020-08-21 17:27:23,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 77 states. [2020-08-21 17:27:23,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 80 transitions. [2020-08-21 17:27:23,715 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 80 transitions. Word has length 70 [2020-08-21 17:27:23,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:23,716 INFO L479 AbstractCegarLoop]: Abstraction has 77 states and 80 transitions. [2020-08-21 17:27:23,716 INFO L480 AbstractCegarLoop]: Interpolant automaton has 28 states. [2020-08-21 17:27:23,716 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 80 transitions. [2020-08-21 17:27:23,716 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2020-08-21 17:27:23,716 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:23,716 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] [2020-08-21 17:27:23,716 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable26 [2020-08-21 17:27:23,716 INFO L427 AbstractCegarLoop]: === Iteration 28 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:23,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:23,717 INFO L82 PathProgramCache]: Analyzing trace with hash 1030916052, now seen corresponding path program 15 times [2020-08-21 17:27:23,717 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:23,717 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1835031971] [2020-08-21 17:27:23,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:23,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:23,759 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:23,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:23,774 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:23,787 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:24,951 INFO L134 CoverageAnalysis]: Checked inductivity of 534 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:24,951 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1835031971] [2020-08-21 17:27:24,951 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:24,951 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29] total 29 [2020-08-21 17:27:24,952 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [517854698] [2020-08-21 17:27:24,952 INFO L459 AbstractCegarLoop]: Interpolant automaton has 29 states [2020-08-21 17:27:24,952 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:24,952 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2020-08-21 17:27:24,953 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=331, Invalid=481, Unknown=0, NotChecked=0, Total=812 [2020-08-21 17:27:24,953 INFO L87 Difference]: Start difference. First operand 77 states and 80 transitions. Second operand 29 states. [2020-08-21 17:27:25,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:25,320 INFO L93 Difference]: Finished difference Result 102 states and 108 transitions. [2020-08-21 17:27:25,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2020-08-21 17:27:25,321 INFO L78 Accepts]: Start accepts. Automaton has 29 states. Word has length 72 [2020-08-21 17:27:25,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:25,322 INFO L225 Difference]: With dead ends: 102 [2020-08-21 17:27:25,322 INFO L226 Difference]: Without dead ends: 80 [2020-08-21 17:27:25,323 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 [2020-08-21 17:27:25,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 80 states. [2020-08-21 17:27:25,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 80 to 79. [2020-08-21 17:27:25,327 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 79 states. [2020-08-21 17:27:25,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2020-08-21 17:27:25,327 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 72 [2020-08-21 17:27:25,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:25,327 INFO L479 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2020-08-21 17:27:25,327 INFO L480 AbstractCegarLoop]: Interpolant automaton has 29 states. [2020-08-21 17:27:25,327 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2020-08-21 17:27:25,328 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2020-08-21 17:27:25,328 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:25,328 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] [2020-08-21 17:27:25,328 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27 [2020-08-21 17:27:25,329 INFO L427 AbstractCegarLoop]: === Iteration 29 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:25,329 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:25,329 INFO L82 PathProgramCache]: Analyzing trace with hash -1030974506, now seen corresponding path program 16 times [2020-08-21 17:27:25,329 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:25,329 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1337852776] [2020-08-21 17:27:25,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:25,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:25,387 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:25,388 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:25,396 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:25,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:26,588 INFO L134 CoverageAnalysis]: Checked inductivity of 581 backedges. 0 proven. 576 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:26,588 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1337852776] [2020-08-21 17:27:26,589 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:26,589 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30] total 30 [2020-08-21 17:27:26,589 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1969746896] [2020-08-21 17:27:26,591 INFO L459 AbstractCegarLoop]: Interpolant automaton has 30 states [2020-08-21 17:27:26,591 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:26,592 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2020-08-21 17:27:26,592 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=513, Unknown=0, NotChecked=0, Total=870 [2020-08-21 17:27:26,592 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand 30 states. [2020-08-21 17:27:26,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:26,877 INFO L93 Difference]: Finished difference Result 104 states and 110 transitions. [2020-08-21 17:27:26,878 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2020-08-21 17:27:26,878 INFO L78 Accepts]: Start accepts. Automaton has 30 states. Word has length 74 [2020-08-21 17:27:26,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:26,879 INFO L225 Difference]: With dead ends: 104 [2020-08-21 17:27:26,879 INFO L226 Difference]: Without dead ends: 82 [2020-08-21 17:27:26,880 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 26 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=419, Invalid=637, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 17:27:26,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2020-08-21 17:27:26,885 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 81. [2020-08-21 17:27:26,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 81 states. [2020-08-21 17:27:26,886 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 84 transitions. [2020-08-21 17:27:26,886 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 84 transitions. Word has length 74 [2020-08-21 17:27:26,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:26,886 INFO L479 AbstractCegarLoop]: Abstraction has 81 states and 84 transitions. [2020-08-21 17:27:26,886 INFO L480 AbstractCegarLoop]: Interpolant automaton has 30 states. [2020-08-21 17:27:26,886 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 84 transitions. [2020-08-21 17:27:26,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2020-08-21 17:27:26,887 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:26,887 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] [2020-08-21 17:27:26,887 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable28 [2020-08-21 17:27:26,887 INFO L427 AbstractCegarLoop]: === Iteration 30 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:26,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:26,887 INFO L82 PathProgramCache]: Analyzing trace with hash 1767090008, now seen corresponding path program 17 times [2020-08-21 17:27:26,888 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:26,888 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1030524090] [2020-08-21 17:27:26,888 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:26,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:26,947 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:26,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:26,958 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:26,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:28,177 INFO L134 CoverageAnalysis]: Checked inductivity of 630 backedges. 0 proven. 625 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:28,177 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1030524090] [2020-08-21 17:27:28,177 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:28,178 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31] total 31 [2020-08-21 17:27:28,178 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [114795932] [2020-08-21 17:27:28,178 INFO L459 AbstractCegarLoop]: Interpolant automaton has 31 states [2020-08-21 17:27:28,178 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:28,179 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2020-08-21 17:27:28,179 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=546, Unknown=0, NotChecked=0, Total=930 [2020-08-21 17:27:28,179 INFO L87 Difference]: Start difference. First operand 81 states and 84 transitions. Second operand 31 states. [2020-08-21 17:27:28,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:28,593 INFO L93 Difference]: Finished difference Result 106 states and 112 transitions. [2020-08-21 17:27:28,593 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2020-08-21 17:27:28,594 INFO L78 Accepts]: Start accepts. Automaton has 31 states. Word has length 76 [2020-08-21 17:27:28,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:28,594 INFO L225 Difference]: With dead ends: 106 [2020-08-21 17:27:28,595 INFO L226 Difference]: Without dead ends: 84 [2020-08-21 17:27:28,596 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 36 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=448, Invalid=674, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:27:28,596 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2020-08-21 17:27:28,599 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 83. [2020-08-21 17:27:28,599 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 83 states. [2020-08-21 17:27:28,600 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 86 transitions. [2020-08-21 17:27:28,600 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 86 transitions. Word has length 76 [2020-08-21 17:27:28,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:28,601 INFO L479 AbstractCegarLoop]: Abstraction has 83 states and 86 transitions. [2020-08-21 17:27:28,601 INFO L480 AbstractCegarLoop]: Interpolant automaton has 31 states. [2020-08-21 17:27:28,601 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 86 transitions. [2020-08-21 17:27:28,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2020-08-21 17:27:28,601 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:28,601 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] [2020-08-21 17:27:28,602 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29 [2020-08-21 17:27:28,602 INFO L427 AbstractCegarLoop]: === Iteration 31 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:28,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:28,602 INFO L82 PathProgramCache]: Analyzing trace with hash 2057560666, now seen corresponding path program 18 times [2020-08-21 17:27:28,602 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:28,603 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1473372664] [2020-08-21 17:27:28,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:28,623 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:28,652 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:28,653 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:28,666 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:28,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:29,987 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 0 proven. 676 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:29,987 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1473372664] [2020-08-21 17:27:29,987 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:29,988 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32] total 32 [2020-08-21 17:27:29,988 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [487318053] [2020-08-21 17:27:29,988 INFO L459 AbstractCegarLoop]: Interpolant automaton has 32 states [2020-08-21 17:27:29,988 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:29,988 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2020-08-21 17:27:29,989 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=412, Invalid=580, Unknown=0, NotChecked=0, Total=992 [2020-08-21 17:27:29,989 INFO L87 Difference]: Start difference. First operand 83 states and 86 transitions. Second operand 32 states. [2020-08-21 17:27:30,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:30,406 INFO L93 Difference]: Finished difference Result 108 states and 114 transitions. [2020-08-21 17:27:30,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2020-08-21 17:27:30,407 INFO L78 Accepts]: Start accepts. Automaton has 32 states. Word has length 78 [2020-08-21 17:27:30,407 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:30,408 INFO L225 Difference]: With dead ends: 108 [2020-08-21 17:27:30,408 INFO L226 Difference]: Without dead ends: 86 [2020-08-21 17:27:30,409 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=478, Invalid=712, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 17:27:30,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2020-08-21 17:27:30,413 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 85. [2020-08-21 17:27:30,413 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 85 states. [2020-08-21 17:27:30,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 88 transitions. [2020-08-21 17:27:30,414 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 88 transitions. Word has length 78 [2020-08-21 17:27:30,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:30,414 INFO L479 AbstractCegarLoop]: Abstraction has 85 states and 88 transitions. [2020-08-21 17:27:30,414 INFO L480 AbstractCegarLoop]: Interpolant automaton has 32 states. [2020-08-21 17:27:30,414 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 88 transitions. [2020-08-21 17:27:30,415 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2020-08-21 17:27:30,415 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:30,415 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] [2020-08-21 17:27:30,415 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30 [2020-08-21 17:27:30,416 INFO L427 AbstractCegarLoop]: === Iteration 32 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:30,416 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:30,416 INFO L82 PathProgramCache]: Analyzing trace with hash 2026988764, now seen corresponding path program 19 times [2020-08-21 17:27:30,416 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:30,416 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1356662399] [2020-08-21 17:27:30,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:30,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:30,468 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:30,469 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:30,479 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:30,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:31,882 INFO L134 CoverageAnalysis]: Checked inductivity of 734 backedges. 0 proven. 729 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:31,882 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1356662399] [2020-08-21 17:27:31,882 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:31,882 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33] total 33 [2020-08-21 17:27:31,883 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1718603261] [2020-08-21 17:27:31,883 INFO L459 AbstractCegarLoop]: Interpolant automaton has 33 states [2020-08-21 17:27:31,883 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:31,883 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2020-08-21 17:27:31,884 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=441, Invalid=615, Unknown=0, NotChecked=0, Total=1056 [2020-08-21 17:27:31,884 INFO L87 Difference]: Start difference. First operand 85 states and 88 transitions. Second operand 33 states. [2020-08-21 17:27:32,300 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:32,300 INFO L93 Difference]: Finished difference Result 110 states and 116 transitions. [2020-08-21 17:27:32,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2020-08-21 17:27:32,301 INFO L78 Accepts]: Start accepts. Automaton has 33 states. Word has length 80 [2020-08-21 17:27:32,301 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:32,302 INFO L225 Difference]: With dead ends: 110 [2020-08-21 17:27:32,303 INFO L226 Difference]: Without dead ends: 88 [2020-08-21 17:27:32,304 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 [2020-08-21 17:27:32,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2020-08-21 17:27:32,308 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 87. [2020-08-21 17:27:32,308 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 87 states. [2020-08-21 17:27:32,309 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 90 transitions. [2020-08-21 17:27:32,309 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 90 transitions. Word has length 80 [2020-08-21 17:27:32,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:32,310 INFO L479 AbstractCegarLoop]: Abstraction has 87 states and 90 transitions. [2020-08-21 17:27:32,310 INFO L480 AbstractCegarLoop]: Interpolant automaton has 33 states. [2020-08-21 17:27:32,310 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 90 transitions. [2020-08-21 17:27:32,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2020-08-21 17:27:32,310 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:32,311 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] [2020-08-21 17:27:32,311 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31 [2020-08-21 17:27:32,311 INFO L427 AbstractCegarLoop]: === Iteration 33 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:32,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:32,311 INFO L82 PathProgramCache]: Analyzing trace with hash -1582805282, now seen corresponding path program 20 times [2020-08-21 17:27:32,311 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:32,312 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1011272142] [2020-08-21 17:27:32,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:32,332 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:32,366 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:32,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:32,378 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:32,397 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:33,872 INFO L134 CoverageAnalysis]: Checked inductivity of 789 backedges. 0 proven. 784 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:33,873 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1011272142] [2020-08-21 17:27:33,873 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:33,873 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34] total 34 [2020-08-21 17:27:33,873 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [895577675] [2020-08-21 17:27:33,873 INFO L459 AbstractCegarLoop]: Interpolant automaton has 34 states [2020-08-21 17:27:33,873 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:33,874 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2020-08-21 17:27:33,874 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=471, Invalid=651, Unknown=0, NotChecked=0, Total=1122 [2020-08-21 17:27:33,874 INFO L87 Difference]: Start difference. First operand 87 states and 90 transitions. Second operand 34 states. [2020-08-21 17:27:34,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:34,320 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2020-08-21 17:27:34,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2020-08-21 17:27:34,321 INFO L78 Accepts]: Start accepts. Automaton has 34 states. Word has length 82 [2020-08-21 17:27:34,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:34,322 INFO L225 Difference]: With dead ends: 112 [2020-08-21 17:27:34,322 INFO L226 Difference]: Without dead ends: 90 [2020-08-21 17:27:34,324 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 [2020-08-21 17:27:34,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2020-08-21 17:27:34,328 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 89. [2020-08-21 17:27:34,328 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 89 states. [2020-08-21 17:27:34,329 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 92 transitions. [2020-08-21 17:27:34,329 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 92 transitions. Word has length 82 [2020-08-21 17:27:34,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:34,329 INFO L479 AbstractCegarLoop]: Abstraction has 89 states and 92 transitions. [2020-08-21 17:27:34,329 INFO L480 AbstractCegarLoop]: Interpolant automaton has 34 states. [2020-08-21 17:27:34,329 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 92 transitions. [2020-08-21 17:27:34,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2020-08-21 17:27:34,330 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:34,330 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] [2020-08-21 17:27:34,330 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32 [2020-08-21 17:27:34,331 INFO L427 AbstractCegarLoop]: === Iteration 34 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:34,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:34,331 INFO L82 PathProgramCache]: Analyzing trace with hash -261308320, now seen corresponding path program 21 times [2020-08-21 17:27:34,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:34,331 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [9511070] [2020-08-21 17:27:34,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:34,364 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:34,405 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:34,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:34,416 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:34,434 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:36,055 INFO L134 CoverageAnalysis]: Checked inductivity of 846 backedges. 0 proven. 841 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:36,056 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [9511070] [2020-08-21 17:27:36,056 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:36,056 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35] total 35 [2020-08-21 17:27:36,056 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1933714677] [2020-08-21 17:27:36,056 INFO L459 AbstractCegarLoop]: Interpolant automaton has 35 states [2020-08-21 17:27:36,057 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:36,057 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2020-08-21 17:27:36,057 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=502, Invalid=688, Unknown=0, NotChecked=0, Total=1190 [2020-08-21 17:27:36,057 INFO L87 Difference]: Start difference. First operand 89 states and 92 transitions. Second operand 35 states. [2020-08-21 17:27:36,571 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:36,572 INFO L93 Difference]: Finished difference Result 114 states and 120 transitions. [2020-08-21 17:27:36,572 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2020-08-21 17:27:36,572 INFO L78 Accepts]: Start accepts. Automaton has 35 states. Word has length 84 [2020-08-21 17:27:36,573 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:36,573 INFO L225 Difference]: With dead ends: 114 [2020-08-21 17:27:36,574 INFO L226 Difference]: Without dead ends: 92 [2020-08-21 17:27:36,575 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 [2020-08-21 17:27:36,575 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2020-08-21 17:27:36,579 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 91. [2020-08-21 17:27:36,579 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 91 states. [2020-08-21 17:27:36,580 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 94 transitions. [2020-08-21 17:27:36,580 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 94 transitions. Word has length 84 [2020-08-21 17:27:36,580 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:36,580 INFO L479 AbstractCegarLoop]: Abstraction has 91 states and 94 transitions. [2020-08-21 17:27:36,580 INFO L480 AbstractCegarLoop]: Interpolant automaton has 35 states. [2020-08-21 17:27:36,581 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 94 transitions. [2020-08-21 17:27:36,581 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2020-08-21 17:27:36,581 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:36,581 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] [2020-08-21 17:27:36,582 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable33 [2020-08-21 17:27:36,582 INFO L427 AbstractCegarLoop]: === Iteration 35 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:36,582 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:36,582 INFO L82 PathProgramCache]: Analyzing trace with hash -1613047454, now seen corresponding path program 22 times [2020-08-21 17:27:36,582 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:36,583 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1606308637] [2020-08-21 17:27:36,583 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:36,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:36,639 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:36,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:36,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:36,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,340 INFO L134 CoverageAnalysis]: Checked inductivity of 905 backedges. 0 proven. 900 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:38,341 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1606308637] [2020-08-21 17:27:38,341 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:38,341 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36] total 36 [2020-08-21 17:27:38,341 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1677884584] [2020-08-21 17:27:38,342 INFO L459 AbstractCegarLoop]: Interpolant automaton has 36 states [2020-08-21 17:27:38,342 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:38,342 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2020-08-21 17:27:38,343 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=534, Invalid=726, Unknown=0, NotChecked=0, Total=1260 [2020-08-21 17:27:38,343 INFO L87 Difference]: Start difference. First operand 91 states and 94 transitions. Second operand 36 states. [2020-08-21 17:27:38,712 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:38,712 INFO L93 Difference]: Finished difference Result 116 states and 122 transitions. [2020-08-21 17:27:38,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2020-08-21 17:27:38,713 INFO L78 Accepts]: Start accepts. Automaton has 36 states. Word has length 86 [2020-08-21 17:27:38,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:38,714 INFO L225 Difference]: With dead ends: 116 [2020-08-21 17:27:38,715 INFO L226 Difference]: Without dead ends: 94 [2020-08-21 17:27:38,716 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 [2020-08-21 17:27:38,716 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2020-08-21 17:27:38,720 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 93. [2020-08-21 17:27:38,720 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 93 states. [2020-08-21 17:27:38,721 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 96 transitions. [2020-08-21 17:27:38,721 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 96 transitions. Word has length 86 [2020-08-21 17:27:38,722 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:38,722 INFO L479 AbstractCegarLoop]: Abstraction has 93 states and 96 transitions. [2020-08-21 17:27:38,722 INFO L480 AbstractCegarLoop]: Interpolant automaton has 36 states. [2020-08-21 17:27:38,722 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 96 transitions. [2020-08-21 17:27:38,722 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2020-08-21 17:27:38,723 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:38,723 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] [2020-08-21 17:27:38,723 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable34 [2020-08-21 17:27:38,723 INFO L427 AbstractCegarLoop]: === Iteration 36 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:38,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:38,723 INFO L82 PathProgramCache]: Analyzing trace with hash 740735460, now seen corresponding path program 23 times [2020-08-21 17:27:38,724 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:38,724 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [2024026289] [2020-08-21 17:27:38,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:38,748 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,777 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:38,778 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:38,787 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:38,804 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:40,599 INFO L134 CoverageAnalysis]: Checked inductivity of 966 backedges. 0 proven. 961 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:40,599 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [2024026289] [2020-08-21 17:27:40,599 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:40,600 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [37] total 37 [2020-08-21 17:27:40,600 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1502457564] [2020-08-21 17:27:40,600 INFO L459 AbstractCegarLoop]: Interpolant automaton has 37 states [2020-08-21 17:27:40,600 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:40,601 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2020-08-21 17:27:40,601 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=567, Invalid=765, Unknown=0, NotChecked=0, Total=1332 [2020-08-21 17:27:40,601 INFO L87 Difference]: Start difference. First operand 93 states and 96 transitions. Second operand 37 states. [2020-08-21 17:27:41,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:41,096 INFO L93 Difference]: Finished difference Result 118 states and 124 transitions. [2020-08-21 17:27:41,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 37 states. [2020-08-21 17:27:41,097 INFO L78 Accepts]: Start accepts. Automaton has 37 states. Word has length 88 [2020-08-21 17:27:41,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:41,098 INFO L225 Difference]: With dead ends: 118 [2020-08-21 17:27:41,098 INFO L226 Difference]: Without dead ends: 96 [2020-08-21 17:27:41,100 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 [2020-08-21 17:27:41,100 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2020-08-21 17:27:41,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 95. [2020-08-21 17:27:41,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 95 states. [2020-08-21 17:27:41,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 98 transitions. [2020-08-21 17:27:41,105 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 98 transitions. Word has length 88 [2020-08-21 17:27:41,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:41,105 INFO L479 AbstractCegarLoop]: Abstraction has 95 states and 98 transitions. [2020-08-21 17:27:41,105 INFO L480 AbstractCegarLoop]: Interpolant automaton has 37 states. [2020-08-21 17:27:41,106 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 98 transitions. [2020-08-21 17:27:41,106 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2020-08-21 17:27:41,106 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:41,106 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] [2020-08-21 17:27:41,106 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35 [2020-08-21 17:27:41,106 INFO L427 AbstractCegarLoop]: === Iteration 37 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:41,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:41,107 INFO L82 PathProgramCache]: Analyzing trace with hash -721649178, now seen corresponding path program 24 times [2020-08-21 17:27:41,107 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:41,107 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [104502590] [2020-08-21 17:27:41,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:41,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,161 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:41,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:41,173 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:41,190 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:43,121 INFO L134 CoverageAnalysis]: Checked inductivity of 1029 backedges. 0 proven. 1024 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:43,121 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [104502590] [2020-08-21 17:27:43,121 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:43,121 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38] total 38 [2020-08-21 17:27:43,122 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2111449375] [2020-08-21 17:27:43,122 INFO L459 AbstractCegarLoop]: Interpolant automaton has 38 states [2020-08-21 17:27:43,122 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:43,122 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2020-08-21 17:27:43,123 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=601, Invalid=805, Unknown=0, NotChecked=0, Total=1406 [2020-08-21 17:27:43,123 INFO L87 Difference]: Start difference. First operand 95 states and 98 transitions. Second operand 38 states. [2020-08-21 17:27:43,528 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:43,529 INFO L93 Difference]: Finished difference Result 120 states and 126 transitions. [2020-08-21 17:27:43,529 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2020-08-21 17:27:43,529 INFO L78 Accepts]: Start accepts. Automaton has 38 states. Word has length 90 [2020-08-21 17:27:43,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:43,531 INFO L225 Difference]: With dead ends: 120 [2020-08-21 17:27:43,531 INFO L226 Difference]: Without dead ends: 98 [2020-08-21 17:27:43,532 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=679, Invalid=961, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 17:27:43,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2020-08-21 17:27:43,536 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 97. [2020-08-21 17:27:43,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 97 states. [2020-08-21 17:27:43,537 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 100 transitions. [2020-08-21 17:27:43,537 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 100 transitions. Word has length 90 [2020-08-21 17:27:43,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:43,538 INFO L479 AbstractCegarLoop]: Abstraction has 97 states and 100 transitions. [2020-08-21 17:27:43,538 INFO L480 AbstractCegarLoop]: Interpolant automaton has 38 states. [2020-08-21 17:27:43,538 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 100 transitions. [2020-08-21 17:27:43,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2020-08-21 17:27:43,538 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:43,539 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] [2020-08-21 17:27:43,539 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36 [2020-08-21 17:27:43,539 INFO L427 AbstractCegarLoop]: === Iteration 38 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:43,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:43,539 INFO L82 PathProgramCache]: Analyzing trace with hash -1618980504, now seen corresponding path program 25 times [2020-08-21 17:27:43,539 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:43,540 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [390387681] [2020-08-21 17:27:43,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:43,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:43,600 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:43,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:43,611 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:43,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:45,637 INFO L134 CoverageAnalysis]: Checked inductivity of 1094 backedges. 0 proven. 1089 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:45,638 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [390387681] [2020-08-21 17:27:45,638 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:45,638 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39] total 39 [2020-08-21 17:27:45,639 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [665589765] [2020-08-21 17:27:45,639 INFO L459 AbstractCegarLoop]: Interpolant automaton has 39 states [2020-08-21 17:27:45,639 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:45,640 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2020-08-21 17:27:45,640 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=636, Invalid=846, Unknown=0, NotChecked=0, Total=1482 [2020-08-21 17:27:45,640 INFO L87 Difference]: Start difference. First operand 97 states and 100 transitions. Second operand 39 states. [2020-08-21 17:27:45,993 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:45,993 INFO L93 Difference]: Finished difference Result 122 states and 128 transitions. [2020-08-21 17:27:45,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2020-08-21 17:27:45,993 INFO L78 Accepts]: Start accepts. Automaton has 39 states. Word has length 92 [2020-08-21 17:27:45,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:45,995 INFO L225 Difference]: With dead ends: 122 [2020-08-21 17:27:45,995 INFO L226 Difference]: Without dead ends: 100 [2020-08-21 17:27:45,996 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 [2020-08-21 17:27:45,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2020-08-21 17:27:45,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 99. [2020-08-21 17:27:46,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 99 states. [2020-08-21 17:27:46,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 102 transitions. [2020-08-21 17:27:46,000 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 102 transitions. Word has length 92 [2020-08-21 17:27:46,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:46,001 INFO L479 AbstractCegarLoop]: Abstraction has 99 states and 102 transitions. [2020-08-21 17:27:46,001 INFO L480 AbstractCegarLoop]: Interpolant automaton has 39 states. [2020-08-21 17:27:46,001 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 102 transitions. [2020-08-21 17:27:46,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2020-08-21 17:27:46,002 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:46,003 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] [2020-08-21 17:27:46,003 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable37 [2020-08-21 17:27:46,003 INFO L427 AbstractCegarLoop]: === Iteration 39 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:46,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:46,003 INFO L82 PathProgramCache]: Analyzing trace with hash -665958294, now seen corresponding path program 26 times [2020-08-21 17:27:46,004 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:46,004 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1959530566] [2020-08-21 17:27:46,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:46,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:46,072 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:46,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:46,083 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:46,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:48,239 INFO L134 CoverageAnalysis]: Checked inductivity of 1161 backedges. 0 proven. 1156 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:48,240 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1959530566] [2020-08-21 17:27:48,240 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:48,240 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40] total 40 [2020-08-21 17:27:48,240 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [381407109] [2020-08-21 17:27:48,241 INFO L459 AbstractCegarLoop]: Interpolant automaton has 40 states [2020-08-21 17:27:48,241 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:48,241 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2020-08-21 17:27:48,242 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=672, Invalid=888, Unknown=0, NotChecked=0, Total=1560 [2020-08-21 17:27:48,242 INFO L87 Difference]: Start difference. First operand 99 states and 102 transitions. Second operand 40 states. [2020-08-21 17:27:48,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:48,585 INFO L93 Difference]: Finished difference Result 124 states and 130 transitions. [2020-08-21 17:27:48,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2020-08-21 17:27:48,585 INFO L78 Accepts]: Start accepts. Automaton has 40 states. Word has length 94 [2020-08-21 17:27:48,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:48,586 INFO L225 Difference]: With dead ends: 124 [2020-08-21 17:27:48,586 INFO L226 Difference]: Without dead ends: 102 [2020-08-21 17:27:48,587 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=754, Invalid=1052, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 17:27:48,587 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2020-08-21 17:27:48,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 101. [2020-08-21 17:27:48,591 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 101 states. [2020-08-21 17:27:48,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 104 transitions. [2020-08-21 17:27:48,592 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 104 transitions. Word has length 94 [2020-08-21 17:27:48,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:48,593 INFO L479 AbstractCegarLoop]: Abstraction has 101 states and 104 transitions. [2020-08-21 17:27:48,593 INFO L480 AbstractCegarLoop]: Interpolant automaton has 40 states. [2020-08-21 17:27:48,593 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 104 transitions. [2020-08-21 17:27:48,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2020-08-21 17:27:48,594 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:48,594 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] [2020-08-21 17:27:48,594 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38 [2020-08-21 17:27:48,594 INFO L427 AbstractCegarLoop]: === Iteration 40 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:48,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:48,595 INFO L82 PathProgramCache]: Analyzing trace with hash 360351468, now seen corresponding path program 27 times [2020-08-21 17:27:48,595 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:48,595 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603157710] [2020-08-21 17:27:48,595 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:48,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:48,650 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:48,651 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:48,662 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:48,683 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:50,833 INFO L134 CoverageAnalysis]: Checked inductivity of 1230 backedges. 0 proven. 1225 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:50,833 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603157710] [2020-08-21 17:27:50,833 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:50,833 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41] total 41 [2020-08-21 17:27:50,833 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1511285948] [2020-08-21 17:27:50,834 INFO L459 AbstractCegarLoop]: Interpolant automaton has 41 states [2020-08-21 17:27:50,834 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:50,834 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2020-08-21 17:27:50,835 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=709, Invalid=931, Unknown=0, NotChecked=0, Total=1640 [2020-08-21 17:27:50,835 INFO L87 Difference]: Start difference. First operand 101 states and 104 transitions. Second operand 41 states. [2020-08-21 17:27:51,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:51,200 INFO L93 Difference]: Finished difference Result 126 states and 132 transitions. [2020-08-21 17:27:51,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2020-08-21 17:27:51,200 INFO L78 Accepts]: Start accepts. Automaton has 41 states. Word has length 96 [2020-08-21 17:27:51,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:51,202 INFO L225 Difference]: With dead ends: 126 [2020-08-21 17:27:51,202 INFO L226 Difference]: Without dead ends: 104 [2020-08-21 17:27:51,203 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=793, Invalid=1099, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 17:27:51,203 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2020-08-21 17:27:51,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 103. [2020-08-21 17:27:51,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 103 states. [2020-08-21 17:27:51,206 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 106 transitions. [2020-08-21 17:27:51,207 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 106 transitions. Word has length 96 [2020-08-21 17:27:51,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:51,207 INFO L479 AbstractCegarLoop]: Abstraction has 103 states and 106 transitions. [2020-08-21 17:27:51,207 INFO L480 AbstractCegarLoop]: Interpolant automaton has 41 states. [2020-08-21 17:27:51,207 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 106 transitions. [2020-08-21 17:27:51,207 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2020-08-21 17:27:51,207 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:51,208 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] [2020-08-21 17:27:51,208 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable39 [2020-08-21 17:27:51,208 INFO L427 AbstractCegarLoop]: === Iteration 41 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:51,208 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:51,208 INFO L82 PathProgramCache]: Analyzing trace with hash -1198445330, now seen corresponding path program 28 times [2020-08-21 17:27:51,208 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:51,208 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [821166314] [2020-08-21 17:27:51,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:51,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:51,272 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:51,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:51,293 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:51,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:53,625 INFO L134 CoverageAnalysis]: Checked inductivity of 1301 backedges. 0 proven. 1296 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:53,625 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [821166314] [2020-08-21 17:27:53,625 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:53,625 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42] total 42 [2020-08-21 17:27:53,625 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1682149715] [2020-08-21 17:27:53,626 INFO L459 AbstractCegarLoop]: Interpolant automaton has 42 states [2020-08-21 17:27:53,626 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:53,626 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2020-08-21 17:27:53,627 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=747, Invalid=975, Unknown=0, NotChecked=0, Total=1722 [2020-08-21 17:27:53,627 INFO L87 Difference]: Start difference. First operand 103 states and 106 transitions. Second operand 42 states. [2020-08-21 17:27:54,079 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:54,079 INFO L93 Difference]: Finished difference Result 128 states and 134 transitions. [2020-08-21 17:27:54,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2020-08-21 17:27:54,079 INFO L78 Accepts]: Start accepts. Automaton has 42 states. Word has length 98 [2020-08-21 17:27:54,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:54,080 INFO L225 Difference]: With dead ends: 128 [2020-08-21 17:27:54,080 INFO L226 Difference]: Without dead ends: 106 [2020-08-21 17:27:54,081 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 [2020-08-21 17:27:54,082 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 106 states. [2020-08-21 17:27:54,088 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 106 to 105. [2020-08-21 17:27:54,088 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 105 states. [2020-08-21 17:27:54,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 108 transitions. [2020-08-21 17:27:54,089 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 108 transitions. Word has length 98 [2020-08-21 17:27:54,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:54,090 INFO L479 AbstractCegarLoop]: Abstraction has 105 states and 108 transitions. [2020-08-21 17:27:54,090 INFO L480 AbstractCegarLoop]: Interpolant automaton has 42 states. [2020-08-21 17:27:54,090 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 108 transitions. [2020-08-21 17:27:54,091 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2020-08-21 17:27:54,091 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:54,091 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] [2020-08-21 17:27:54,091 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40 [2020-08-21 17:27:54,091 INFO L427 AbstractCegarLoop]: === Iteration 42 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:54,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:54,092 INFO L82 PathProgramCache]: Analyzing trace with hash -258581904, now seen corresponding path program 29 times [2020-08-21 17:27:54,092 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:54,092 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1304325611] [2020-08-21 17:27:54,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:54,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:54,188 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:54,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:54,202 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:54,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:56,677 INFO L134 CoverageAnalysis]: Checked inductivity of 1374 backedges. 0 proven. 1369 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:56,677 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1304325611] [2020-08-21 17:27:56,677 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:56,677 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43] total 43 [2020-08-21 17:27:56,678 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1916872121] [2020-08-21 17:27:56,678 INFO L459 AbstractCegarLoop]: Interpolant automaton has 43 states [2020-08-21 17:27:56,678 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:56,678 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2020-08-21 17:27:56,679 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=1020, Unknown=0, NotChecked=0, Total=1806 [2020-08-21 17:27:56,679 INFO L87 Difference]: Start difference. First operand 105 states and 108 transitions. Second operand 43 states. [2020-08-21 17:27:57,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:27:57,266 INFO L93 Difference]: Finished difference Result 130 states and 136 transitions. [2020-08-21 17:27:57,266 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 43 states. [2020-08-21 17:27:57,267 INFO L78 Accepts]: Start accepts. Automaton has 43 states. Word has length 100 [2020-08-21 17:27:57,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:27:57,268 INFO L225 Difference]: With dead ends: 130 [2020-08-21 17:27:57,268 INFO L226 Difference]: Without dead ends: 108 [2020-08-21 17:27:57,269 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=874, Invalid=1196, Unknown=0, NotChecked=0, Total=2070 [2020-08-21 17:27:57,269 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2020-08-21 17:27:57,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 107. [2020-08-21 17:27:57,273 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 107 states. [2020-08-21 17:27:57,274 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 107 states to 107 states and 110 transitions. [2020-08-21 17:27:57,274 INFO L78 Accepts]: Start accepts. Automaton has 107 states and 110 transitions. Word has length 100 [2020-08-21 17:27:57,274 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:27:57,274 INFO L479 AbstractCegarLoop]: Abstraction has 107 states and 110 transitions. [2020-08-21 17:27:57,275 INFO L480 AbstractCegarLoop]: Interpolant automaton has 43 states. [2020-08-21 17:27:57,275 INFO L276 IsEmpty]: Start isEmpty. Operand 107 states and 110 transitions. [2020-08-21 17:27:57,275 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2020-08-21 17:27:57,275 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:27:57,275 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] [2020-08-21 17:27:57,276 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41 [2020-08-21 17:27:57,276 INFO L427 AbstractCegarLoop]: === Iteration 43 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:27:57,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:27:57,276 INFO L82 PathProgramCache]: Analyzing trace with hash 1007038322, now seen corresponding path program 30 times [2020-08-21 17:27:57,276 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:27:57,277 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1064839777] [2020-08-21 17:27:57,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:27:57,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,349 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:27:57,350 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:57,367 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:27:57,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:27:59,905 INFO L134 CoverageAnalysis]: Checked inductivity of 1449 backedges. 0 proven. 1444 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2020-08-21 17:27:59,906 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1064839777] [2020-08-21 17:27:59,906 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 1 imperfect interpolant sequences. [2020-08-21 17:27:59,906 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44] total 44 [2020-08-21 17:27:59,906 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515707361] [2020-08-21 17:27:59,907 INFO L459 AbstractCegarLoop]: Interpolant automaton has 44 states [2020-08-21 17:27:59,907 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-08-21 17:27:59,907 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2020-08-21 17:27:59,908 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=826, Invalid=1066, Unknown=0, NotChecked=0, Total=1892 [2020-08-21 17:27:59,908 INFO L87 Difference]: Start difference. First operand 107 states and 110 transitions. Second operand 44 states. [2020-08-21 17:28:00,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-08-21 17:28:00,308 INFO L93 Difference]: Finished difference Result 132 states and 138 transitions. [2020-08-21 17:28:00,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2020-08-21 17:28:00,309 INFO L78 Accepts]: Start accepts. Automaton has 44 states. Word has length 102 [2020-08-21 17:28:00,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-08-21 17:28:00,311 INFO L225 Difference]: With dead ends: 132 [2020-08-21 17:28:00,311 INFO L226 Difference]: Without dead ends: 110 [2020-08-21 17:28:00,312 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=916, Invalid=1246, Unknown=0, NotChecked=0, Total=2162 [2020-08-21 17:28:00,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2020-08-21 17:28:00,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 109. [2020-08-21 17:28:00,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 109 states. [2020-08-21 17:28:00,318 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 112 transitions. [2020-08-21 17:28:00,318 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 112 transitions. Word has length 102 [2020-08-21 17:28:00,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-08-21 17:28:00,319 INFO L479 AbstractCegarLoop]: Abstraction has 109 states and 112 transitions. [2020-08-21 17:28:00,319 INFO L480 AbstractCegarLoop]: Interpolant automaton has 44 states. [2020-08-21 17:28:00,319 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 112 transitions. [2020-08-21 17:28:00,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2020-08-21 17:28:00,320 INFO L414 BasicCegarLoop]: Found error trace [2020-08-21 17:28:00,320 INFO L422 BasicCegarLoop]: trace histogram [39, 39, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-08-21 17:28:00,320 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42 [2020-08-21 17:28:00,320 INFO L427 AbstractCegarLoop]: === Iteration 44 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-08-21 17:28:00,320 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-08-21 17:28:00,320 INFO L82 PathProgramCache]: Analyzing trace with hash 1792330740, now seen corresponding path program 31 times [2020-08-21 17:28:00,321 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-08-21 17:28:00,321 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [777087953] [2020-08-21 17:28:00,321 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-08-21 17:28:00,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,377 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-08-21 17:28:00,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-08-21 17:28:00,389 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 6 [2020-08-21 17:28:00,407 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat